Home

P.35C-267 - Evo X Service Manuals

1. Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CG 35C 53 DIAGNOSIS STEP 10 Connector check A 05 ASC ECU connector A 03 wheel speed sensor lt FR gt connector Q Is the check result normal YES Go to Step 11 NO Repair the defective connector Then go to Step 16 STEP 11 Wiring harness check between A 05 ASC ECU connector terminal No 34 and A 03 wheel speed sensor lt FR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 33 and A 03 wheel speed sensor lt FR gt connector terminal No 2 e Short circuit check of wheel speed sensor lt FR gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt FR gt Refer to P 35C 274 Then go to Step 16 NO Repair the wiring harness Then go to Step 16 STEP 12 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 34 and the body ground OK System voltage Q Is the check result normal YES Go to Step 13 NO Go to Step 15 STEP 13 Connector check A 05 ASC ECU connector A 03 wheel speed sen
2. P 35C 122 ACTIVE SKID CONTROL SYSTEM ASC 35C 21 DIAGNOSIS Item Reference page Abnormality in power supply voltage in pump motor P 35C 126 Abnormality in brake fluid pressure sensor circuit P 35C 130 Abnormality in brake fluid pressure sensor output signal P 35C 132 Abnormality in wheel fluid pressure sensor circuit P 35C 135 Abnormality in wheel fluid pressure sensor output signal P 35C 136 Abnormality in stoplight switch circuit P 35C 140 Prolonged operation of ASC P 35C 146 Abnormality in ASC ECU P 35C 149 Abnormality in battery 18 0 1 0 V or more P 35C 150 voltage high voltage Brake fluid filling not completed P 35C 156 Torque request signal rejection P 35C 157 CAN time out error P 35C 159 VIN not recorded P 35C 162 Re execution of variant coding P 35C 164 Abnormality in G and yaw Abnormality in longitudinal P 35C 167 rate sensor G sensor output voltage Abnormality in G and yaw Abnormality in longitudinal P 35C 169 rate sensor G sensor output signal Abnormality in G and yaw Abnormality in lateral G sensor P 35C 171 rate sensor output value incorrect installation Abnormality in yaw rate sensor output voltage Internal abnormality in G and Abnormality in internal circuit P 35C 174 yaw rate sensor Abnormality in lateral G sensor output voltage Abnormality in yaw rate sensor output voltage Abnormality in G and yaw
3. Judgment Table Display on Operation Inspection Judgme Probable cause Remedy scan tool result nt 01 FL wheel e Depress the brake Braking force Normal ABS drive pedal to lock the decreases for 3 02 FR wheel vehicle seconds from ABS drive e Select the vehicle the lock status Meo eee kea The wheel Error Clogged brake line Check and i does not lock other than hydraulic clean the brake 04 RR wheel perform the even if the unit line ABS drive actuator test rake pedali pedal is e Rotate the selected depressed Clogged hydraulic Replace the wheel by hands to circuit in the hydraulic hydraulic unit confirm the braking unit assembly force Braking force Faulty routing of Route the does not hydraulic unit brake brake tube decrease tube correctly Malfunction of Replace the hydraulic unit solenoid hydraulic unit valve operation assembly 05 FL wheel e Select the vehicle Lock condition Normal TCL drive to be inspected occurs for 3 06 FR wheel using scan tool seconds from TCL drive perform the the status 07 RL wheel actuator test without braking TCL drive e Rotate the selected force aa ii A aortas The wheel Error e Faulty routing of Check and fares does not lock hydraulic unit brake clean the brake tube line e Clogged brake line other than hydraulic unit Clogged hydraulic Replace the circuit in the hydraulic hydraulic unit unit assembly 7 After the inspection tu
4. DTC SET CONDITIONS ASC ECU monitors the signals from each wheel speed sensor while the vehicle is being driven If any periodical drop abnor mality is detected in the sensor signals ASC ECU sets the rel evant diagnostic trouble code TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 83 PROBABLE CAUSES e Wheel bearing malfunction e Deformation of the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the magnetic encoder for wheel speed detection e ABS ECU malfunction e Disturbance of magnetization pattern for magnetic encoder for wheel speed detection e Missing teeth of the magnetic encoder for wheel speed detection DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1041 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap
5. AC400817CL MB991997 A 05 ASC ECU harness connector ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 4 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor power supply terminal signal terminal No 43 and the body ground as well as between the ground terminal No 42 and the body ground OK 1 volt or less Q Is the check result normal YES Go to Step 5 NO Not normal at the terminal No 43 or 42 Go to Step 6 STEP 5 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 43 and the body ground as well as between the ground terminal No 42 and the body ground OK No continuity Q Is the check result normal YES Go to Step 8 NO Not normal at the terminal No 43 or 42 Go to Step 6 TSB Revision ACTIVE SKID
6. Variant coding value invalid includes faulty installation NOTE Only for vehicles with TC SST TSB Revision P 35C 215 ACTIVE SKID CONTROL SYSTEM ASC 35C 23 DIAGNOSIS DIAGNOSTIC TROUBLE CODE PROCEDURES DTC C100A Abnormality in FL wheel speed sensor circuit Connector A 05 AC708948AB Connector A 11 AC708949 AB A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed
7. TSB Revision 35C 194 MB991997 A 05 ASC ECU harness connector ACTIVE SKID CONTROL SYSTEM ASC Check harness ASC ECU AC400817CO DIAGNOSIS STEP 12 Voltage measurement at the C 315 ETACS ECU connector 1 Without disconnecting the connector measure by backprobing 2 Measure the voltage between the terminal No 4 and the body ground OK System voltage Q Is the check result normal YES Go to Step 14 NO Go to Step 13 STEP 13 Connector check C 103 joint connector C 130 intermediate connector Q Is the check result normal YES Go to Step 14 NO Repair the defective connector STEP 14 Wiring harness check between A 05 ASC ECU connector terminal No 2 and C 315 ETACS ECU connector terminal No 4 e Open or short circuit check Q Is the check result normal YES Go to Step 15 NO Repair the wiring harness STEP 15 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Resistance between the terminal No 16 and the body ground and between the terminal No 47 and the body ground OK Continuity exists 2 Q or less Q Is the check result normal YES Go to Step 17 NO Go to Step 16
8. ACTIVE SKID CONTROL SYSTEM ASC 35C 55 DIAGNOSIS DTC C1027 Abnormality in RL wheel speed sensor signal Connector A 05 ee AC708948AB Connector D 1 8 lt AC708955AE Connector C 45 AC708950AD A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed e The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed TSB Revision 35C 56 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC SET CONDITIONS ASC ECU monitors the signals fro
9. TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 92 DIAGNOSIS STEP 6 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1044 set YES Return to Step 1 NO This diagnosis is complete DTC C1046 FL wheel speed sensor control phase time exceeded Connector A 05 Connector A 11 oe AC708948AB eee AC708949 AB A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed e The pu
10. Q Is any DTC set YES Go to Step 4 NO Carry out the diagnosis for the diagnostic trouble code that is set Refer to P 35C 20 STEP 4 G and yaw rate sensor calibration Perform calibration of the G and yaw rate sensor Refer to P 35C 266 Q Has the calibration succeeded YES Go to Step 5 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 8 STEP 5 Steering wheel sensor calibration Perform calibration of the steering wheel sensor Refer to P 35C 267 Q Has the calibration succeeded YES Go to Step 6 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 8 TSB Revision 35C 184 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 6 Master cylinder pressure sensor calibration Perform calibration of the brake fluid pressure sensor Refer to P 35C 268 Q Has the calibration succeeded YES Go to Step 7 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 8 STEP 7 Check whether the DTC is reset Q Is DTC C123A set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 8 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 8 Check whether the DTC is reset Q Is DTC C123A set YES Return to Step 1 NO The procedure is complete DTC C1219 A
11. ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 259 CHECK AT ECU TERMINALS M1355001700191 TERMINAL VOLTAGE CHECK Required Special Tool MB991997 ASC Check Harness 1 Operate the lock lever as shown in the figure to disconnect the ASC ECU wiring harness connector 2 Connect special tool ASC Check Harness MB991997 to measure the voltage between each check connector terminal and the ground terminal No 16 or 47 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC401192AG TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 260 DIAGNOSIS Terminal Check item Check conditions Normal No conditions 1 Motor power supply Ignition switch ON OFF Approximately battery voltage 2 ASC ECU power supply Ignition switch ON OFF Approximately battery voltage 22 G and yaw rate sensor power Ignition switch ON Approximately supply battery voltage 32 Solenoid valve power supply Ignition switch ON OFF Approximately battery voltage 34 Wheel speed sensor FR power Ignition switch ON Approximately supply battery voltage 36 Wheel speed sensor RL power Ignition switch ON Approximately supply battery voltage 43 Wheel speed sensor RR power _ Ignition switch ON Approximately supply battery voltage 45 Wheel speed sensor FL power Ig
12. DIAGNOSIS Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CG STEP 9 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 34 and the body ground OK System voltage Q Is the check result normal YES Go to Step 10 NO Goto Step 12 STEP 10 Wiring harness check between A 05 ASC ECU connector terminal No 34 and A 03 wheel speed sensor lt FR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 33 and A 03 wheel speed sensor lt FR gt connector terminal No 2 e Open circuit check of wheel speed sensor lt FR gt circuit Q Is the check result normal YES Go to Step 11 NO Repair the wiring harness Then go to Step 17 STEP 11 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 13 NO Replace the wheel speed sensor lt FR gt Refer to P 35C 274 Then go to Step 17 STEP 12 Connector check A 05 ASC ECU connector A 03 wheel speed sensor lt FR gt connector Q Is the check result norma
13. DTC SET CONDITIONS ASC ECU monitors the electric current in each wheel speed sensor circuit If an open or short circuit in the wheel speed sensor circuit is detected ASC ECU sets a corresponding diagnostic trouble code TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 24 DIAGNOSIS PROBABLE CAUSES Current trouble Damaged wiring harness and connectors Noise interference Malfunction of wheel speed sensor ABS ECU malfunction Past trouble e Carry out the diagnosis with a particular emphasis on the wiring harness and connector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshooting Inspection Service Points P 00 16 DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C100A set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool service data Chec
14. MB991997 AC400817CF A 05 ASC ECU harness connector STEP 8 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 34 and the body ground as well as between the ground terminal No 33 and the body ground OK 1 volt or less Q Is the check result normal YES Go to Step 9 NO Not normal at the terminal No 34 or 33 Go to Step 10 STEP 9 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 34 and the body ground as well as between the ground terminal No 33 and the body ground OK No continuity Q Is the check result normal YES Go to Step 12 NO Not normal at the terminal No 34 or 33 Go to Step 10 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC
15. 35C 230 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 7 Retest the system Q Does the brake warning light turn ON and OFF normally YES The procedure is complete NO Return to Step 1 Inspection Procedure 5 The ABS warning light remains illuminated even after the engine is started A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 SYSTEM OPERATION e ASC ECU sends the illumination signal of ABS warning light to the combination meter through ETACS ECU via CAN communication e When the ignition switch is turned ON ASC ECU illumi nates the ABS warning light via ETACS ECU for approxi mately 3 seconds for the purpose of bulb check TECHNICAL DESCRIPTION COMMENT In the case of this trouble symptom there may be a malfunction to the CAN bus line ETACS ECU combination meter or ASC ECU PROBABLE CAUSES Damaged wiring harness and connectors Malfunction of ETACS ECU Combination meter malfunction ASC ECU malfunction Control stop due to the low voltage NOTE
16. Ke SS a aaa AC708955 AH A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 39 DTC SET CONDITIONS ASC ECU monitors the electric current in each wheel speed sensor circuit If an open or short circuit in the wheel speed sensor circuit is detected ASC ECU sets a corresponding diagnostic trouble code PROBABLE CAUSES Current trouble Damaged wiring
17. Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC No C1015 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool service data Check the following service data Refer to P 35C 255 e Item No 02 FR wheel speed sensor Q Is the check result normal YES Go to Step 12 NO Go to Step 4 TSB Revision 35C 30 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CE Check harness ASC ECU MB991997 AC400817CF A 05 ASC ECU harness connector STEP 4 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor power supply terminal signal terminal No 34 and the body ground as well as between the ground terminal No 33 and the body ground OK 1 volt or less Q Is the check result normal YES Go to Step 5 NO Not normal at terminal 34 or 33 Go to Step 6 STEP 5 Resistance measurement at A 05
18. Refer to P 35C 274 NO Abnormality of items 08 12 Check the installation status of G and yaw rate sensor Refer to P 35C 278 NO Abnormality of item 11 Check the installation status of steering wheel sensor Refer to P 35C 279 NO Abnormality of items 10 129 to 132 Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 TSB Revision i ACTIVE SKID CONTROL SYSTEM ASC 35C 254 DIAGNOSIS STEP 7 Hydraulic unit check Perform the following actuator tests and check that the opera tion is normal Refer to P 35C 255 e Item 01 FL wheel ABS drive Item 02 FR wheel ABS drive Item 03 RL wheel ABS drive Item 04 RR wheel ABS drive Item 05 FL wheel TCL drive Item 06 FR wheel TCL drive Item 07 RL wheel TCL drive Item 08 RR wheel TCL drive Q Is the check result normal YES Go to Step 8 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 9 STEP 8 Operation check of ABS skid control TCL Q Is the check result normal YES Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 9 STEP 9 Operation check of ABS skid control TCL Q Is the check result normal YES The procedure is complete NO Return to Step 1 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DATA LIST R
19. Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 13 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 13 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C100A set YES Return to Step 1 NO This diagnosis is complete TSB Revision 35C 28 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC C1015 Abnormality in FR wheel speed sensor circuit Connectors A 03 A 05 ee AC708948AC A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the whe
20. TSB Revision 35C 6 ACTIVE SKID CONTROL SYSTEM ASC SERVICE SPECIFICATIONS SERVICE SPECIFICATIONS Item M1355008200108 Standard value Wheel speed sensor current mA 5 9 8 4 or 11 8 16 8 Wheel speed sensor insulation resistance MQ 5 or more DIAGNOSIS INTRODUCTION TO ASC DIAGNOSIS The active skid control system ASC operates differ ently from conventional brake systems These differ ences include sounds sensations and vehicle performance that owners and service technicians who are not familiar with ASC may not be used to ASC DIAGNOSTIC TROUBLE CODE DETECTION CONDITIONS ASC diagnostic trouble codes ASC DTCs are set under different conditions depending on the mal function detected Most ASC DTCs will only be set during vehicle operation Some ASC DTCs will also be set during the ASC self check immediately after the engine is started M1355000800054 Some operational characteristics may seem to be malfunctions but they are simply signs of normal ASC operation When diagnosing the ASC system keep these operational characteristics in mind Inform the owner of the kind of performance charac teristics to expect from an ASC equipped vehicle When you check if an ASC DTC will be displayed again after the DTC has been erased you should duplicate the ASC DTC set conditions Depending on the detection timing and set conditions for the spe cific ASC DTC you must either drive the v
21. TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 195 STEP 16 Connector check A 05 ASC ECU connector Q Is the check result normal YES An open circuit may be present in the ground circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 16 and the body ground as well as between A 05 ASC ECU connector terminal No 47 and the body ground NO Repair the defective connector then go to Step 17 STEP 17 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Turn the ignition switch to the LOCK OFF position 3 Turn the ignition switch to the ON position Q Is the DTC C1608 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 18 NO Go to Step 19 STEP 18 Check whether the DTC is reset Q Is the DTC C1608 set YES Return to Step 1 NO Go to Step 19 STEP 19 Check for diagnostic trouble codes of other systems Perform a test run of the vehicle at the vehicle speed of 12 mph 20 km h or more Then check if any other diagnostic trouble code is set in ASC ECU Q Is any DTC set YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 20 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 196 DIAGNOSIS DTC C2002 Abnormality in valve calibration A CAUTION e If there is any problem in the CAN bu
22. Then go to Step 16 STEP 5 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 6 NO Replace the wheel speed sensor lt FR gt Refer to P 35C 274 Then go to Step 16 STEP 6 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt FR gt for loose ness Refer to GROUP 26 On vehicle Service P 26 7 Q Is the check result normal YES Go to Step 7 NO Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 7 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor Oil seal mation Q Is the check result normal PSS YES Go to Step 8 Magnetic NO Adhesion of foreign materials Clean the encoder encoder so as not to disturb the magnetization pattern on the Pa encoder while taking care of the magnet magnetic wl Wheel substance and magnetic attraction bearing NO Deformation Replace the front hub assembly Refer AC704652 AB to GROUP 26 Front Axle Hub Assembly P 26 9 TSB Revision 35C 52 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CE Check harness ASC ECU
23. rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e If diagnostic trouble code U0001 is set in ASC ECU always diagnose CAN bus lines If there is any fault in the CAN bus lines an incorrect DTC may be set e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 DTC SET CONDITIONS This diagnostic trouble code is set when ASC ECU has ceased CAN communication bus off PROBABLE CAUSES e Wiring harness or connector failure of CAN bus line e ASC ECU malfunction e ECU malfunction of other system DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 3 STEP 2 Check whether
24. 15 When a message Inlet valve fluid pressure Are you sure to execute the selected item Caution Check the execution conditions is displayed press the OK button 16 When a message Command execution Command has been executed is displayed press the OK button 17 Check that the message changes from Under execution to Complete NOTE The inlet valve fluid pressure learning requires approximately 20 seconds 18 The valve fluid pressure learning is complete 19 Turn the ignition key to the LOCK OFF position and then remove the scan tool from the vehicle TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 271 SC OFF SWITCH U UOO ASC OFF SWITCH REMOVAL AND INSTALLATION M1355020100109 AC708758AB Removal steps Removal steps Continued 1 Instrument panel lower assembly Instrument panel lower Refer to GROUP 52A ASC OFF switch Instrumental Lower Panel P 52A 8 2 ASC OFF switch connector Tw INSPECTION M1355020200106 ASC OFF SWITCH CONTINUITY CHECK 1 As shown in the figure connect the circuit tester to the ASC OFF switch as a single unit 2 Check the continuity of when the ASC OFF switch is pressed and released Item ASC OFF ASC OFF switch is switch is released not pressed at 516 operated Pee ee if ac400824aB Continuity No continuity Continuity exists between 2Q or less terminal No 1 and No 2 Continuity Continuity
25. Check that the diagnostic trouble codes No C1015 C101C C101F and C1042 are simultaneously set Q Are DTC C1015 C101C C101F and C1042 also set YES Carry out the diagnosis for the diagnostic trouble codes that are set and then go to Step 5 NO Go to Step 4 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 100 DIAGNOSIS STEP 4 Scan tool service data Check the following service data Refer to P 35C 255 e Item No 02 FR wheel speed sensor Q Is the check result normal YES Go to Step 16 NO Goto Step 5 STEP 5 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor power supply terminal signal terminal No 34 and the body ground as well as between the ground terminal No 33 and the body ground OK 1 volt or less Check harness Q Is the check result normal YES Goto Step 6 NO Not normal at terminal 34 or 33 Go to Step 7 MB991 ASC ECU A 05 ASC ECU harness connector AC400817CE TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 101 Check harness MB991 a ASC
26. Due to the abnormality in the supply voltage the diagnostic trouble code may not be set even when the ABS warning light is illuminated DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 231 DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 Then go to Step 7 STEP 2 Scan tool diagnostic trouble code Using scan tool check the diagnostic trouble code for ASC sys tem Q Is any DTC set YES Carry out the diagnosis for the DTC Refer to P 35C 20 NO Goto Step 3 STEP 3 Check of ASC ECU power supply circuit Refer to P 35C 243 Q Is the check result normal YES Go to Step 4 NO Carry out the diagnosis of ASC ECU power supply circuit system Refer to P 35C 243 STEP 4 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if diagnostic trouble code No U0141 is set by the combination meter system Q Is the DTC set YES Diagnose the combination meter Refer to GROUP 54A Combination Meter Troubleshooting P 54A 45 Then go to Step 7 NO Goto Step 5
27. NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1032 set YES Return to Step 1 NO This diagnosis is complete DTC C1014 Mutual monitoring of FL wheel speed sensor LA CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed e The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 69 DIAGNOSIS DTC SET CONDITIONS AS C ECU monitors the signals from ea
28. Rear Axle Hub Assembly P 27 36 STEP 8 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 43 and the body ground as well as between the ground terminal No 42 and the body ground OK 1 volt or less Q Is the check result normal YES Goto Step 9 NO Not normal at the terminal No 43 or 42 Go to Step 10 TSB Revision 35C 66 ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991 a ASC ECU A 05 ASC ECU harness connector AC400817CL DIAGNOSIS STEP 9 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 43 and the body ground as well as between the ground terminal No 42 and the body ground OK No continuity Q Is the check result nor
29. and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed e The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed TSB Revision 35C 76 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC SET CONDITIONS ASC ECU monitors the signals from each wheel speed sensor while the vehicle is being driven If any abnormality below is detected in the sensor signals ASC ECU sets the relevant diagnostic trouble code Missing wheel speed sensor signal Wheel speed sensor signal continuously indicates lower value than the values of other wheel speed sensors PROBABLE CAUSES Current trouble Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the wheel speed sensor e Wheel bearing malfunction e Deformation of the magnetic encoder for wheel speed detection Adhesion of foreign materials on the magnetic encoder for wheel speed detection Malf
30. display 35C 9 ASC OFF light Abnormality in FL wheel speed sensor circuit Abnormality in FR wheel speed sensor circuit Abnormality in RL wheel speed sensor circuit Abnormality in RR wheel speed sensor circuit Extinguished Illuminated 2 Illuminated Illuminated Abnormality in FL wheel speed sensor signal Abnormality in FR wheel speed sensor signal Abnormality in RL wheel speed sensor signal Abnormality in RR wheel speed sensor signal Extinguished Illuminated 2 Illuminated Illuminated Mutual monitoring of FL wheel speed sensor Mutual monitoring of FR wheel speed sensor Mutual monitoring of RL wheel speed sensor Mutual monitoring of RR wheel speed sensor Extinguished Illuminated 2 Illuminated Illuminated Abnormality in periodical signal for FL wheel speed sensor Abnormality in periodical signal for FR wheel speed sensor Abnormality in periodical signal for RL wheel speed sensor Abnormality in periodical signal for RR wheel speed sensor Extinguished Illuminated 2 Illuminated Illuminated FL wheel speed sensor control phase time exceeded FR wheel speed sensor control phase time exceeded RL wheel speed sensor control phase time exceeded RR wheel speed sensor control phase time exceeded Extinguished Illuminated 2 TSB Revision Illuminated Illuminate
31. for the solenoid valve The solenoid valve is energized by the valve relay which is incorporated in ASC ECU The valve relay in ASC ECU is energized at all times and the solenoid valve is always energized while the system is in operation unless the initial check is in progress when the ignition switch is turned ON or unless the periodical system check is in progress DTC SET CONDITIONS This diagnostic trouble code is set when the solenoid valve supply voltage is out of the standard value PROBABLE CAUSES Current trouble Fusible link malfunction Damaged wiring harness and connectors Abnormality in battery or generator ASC ECU malfunction TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 1 1 9 Past trouble e Carry out the diagnosis with a particular emphasis on the wiring harness and connector failures in the ASC ECU sole noid valve power supply circuit terminal No 32 and in the ground circuit terminal No 16 and No 47 For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshooting Inspection Service Points P 00 16 DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN
32. in operation unless the initial check is in progress when the ignition switch is turned ON or unless the periodical system check is in progress ASC ECU activates the solenoid valve by turning on its driv ing transistor DTC SET CONDITIONS These diagnostic trouble codes are set under the cases below The solenoid valve is not energized even after ASC ECU has turned on the driving transistor Open circuit is present in the power supply circuit to ASC ECU solenoid valve or ASC ECU solenoid valve circuit or the valve relay has failed The solenoid valve still remains energized even after ASC ECU has turned off the driving transistor Short circuit in the solenoid valve circuit When a solenoid valve failure is detected PROBABLE CAUSES ASC ECU malfunction TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 117 DIAGNOSIS DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Ar
33. lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q ls DTC C1000 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Battery check Refer to GROUP 54A Battery Test P 54A 9 Q Is the battery in good condition YES Go to Step 4 NO Charge or replace the battery and the go to Step 16 STEP 4 Stoplight operation check Check that the stoplight is turned ON when the brake pedal is depressed and that the stoplight is turned OFF when the brake pedal is released OK When the brake pedal is released OFF When the brake pedal is depressed ON Q Is the check result normal YES Go to Step 17 NO Goto Step 5 STEP 5 Check for stoplight switch installation Refer to GROUP 35A On vehicle Service P 35A 12 Q Is the check result normal YES Go to Step 6 NO Install the stoplight switch correctly Refer to GROUP 35A On vehicle Service P 35A 12 Then go to Step 19 TSB Revision 35C 142 ACTIVE SKID CONTROL SYSTEM ASC No continuity Continuity HF AUN 4 mm 0 16 in ACX00671AE DIAGNOSIS STEP 6 Stoplight switch continuity check 1 Remove the stoplight switch Refer to GROUP 35A Brake Pedal P 35A 25 2 Con
34. permitted 70 Target gear The shift lever is operated Displays the shift lever 71 Actual gear position 72 Master cylinder pressure Master cylinder pressure sensor 8 to 8 bar Offset correction amount at the master cylinder pressure sensor calibration 73 Lateral G sensor offset Lateral G sensor correction 0 17 to 0 17 G amount at G and yaw rate sensor calibration 86 Ignition switch Ignition switch is ON position ON 87 Ignition switch input Ignition switch is ON position ON Ignition switch is START START position 88 Vehicle speed Perform a test run of the vehicle The speedometer display and scan tool display almost agree with each other 91 Brake pressure sensor The brake pedal is depressed Pressed The brake pedal is released Not pressed 96 G sensor offset Longitudinal G sensor correction 0 3 to 0 3 G amount at G and yaw rate sensor calibration 97 Yaw rate sensor offset Yaw rate sensor correction 6 0 to 6 0 deg s amount at G and yaw rate sensor calibration TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 257 DIAGNOSIS Item No Check item Check conditions Normal conditions 105 Power supply voltage input System voltage 10 to 18 V ASC operable range 120 Parking brake switch When the parking brake leveris ON input pulled up When the parking brake lever is OFF released 128 ASC TCL off switch When the ASC OFF switch is ON pressed When the A
35. ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 34 and the body ground as well as between the ground terminal No 33 and the body ground OK No continuity Q Is the check result normal YES Go to Step 8 NO Not normal at terminal 34 or 33 Go to Step 6 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 31 STEP 6 Connector check A 05 ASC ECU connector A 03 wheel speed sensor lt FR gt connector Q Is the check result normal YES Go to Step 7 NO Repair the defective connector Then go to Step 13 STEP 7 Wiring harness check between A 05 ASC ECU connector terminal No 34 and A 03 wheel speed sensor lt FR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 33 and A 03 wheel speed sensor lt FR gt connector terminal No 2 e Short circuit check of wheel speed sensor lt FR gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt FR gt Refer to P 35C 274 Then go to Step 13 NO Repair the wiring harness Then go to Step 13 STEP 8 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector co
36. Abnormality in wheel fluid pressure sensor circuit Extinguished Illuminated Illuminated Illuminated Abnormality in wheel fluid pressure sensor output signal Extinguished Illuminated Illuminated Illuminated Abnormality in stoplight switch circuit Extinguished Extinguished Illuminated Illuminated Prolonged operation of ASC Extinguished Extinguished Illuminated Illuminated Abnormality in ASC ECU Illuminated Illuminated TSB Revision Illuminated Illuminated ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Brake warning light brake warning display ABS warning light ABS warning display ASC warning display 35C 11 ASC OFF light Abnormality in battery voltage high voltage 18 0 1 0 V or more Illuminated Illuminated Illuminated Illuminated Brake fluid filling not completed Extinguished ABS warning light Flashes 1 Hz Extinguished Extinguished Torque request signal rejection Extinguished Extinguished Illuminated Illuminated CAN time out error VIN not recorded Extinguished Extinguished Extinguished Illuminated Illuminated Extinguished Illuminated Extinguished Re execution of variant coding Extinguished Illuminated Illuminated Illuminated Abnormality in G and yaw rate sensor Abnormality in G and yaw rate sensor Abn
37. As shown in the figure align the edge of front wheel speed sen sor marking with the edge of clip then perform the installation TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 277 AC608846 AB lt Front gt MB992006 e eeean sc eeeanaeananaeooan ena anaae AC608847AB WHEEL SPEED SENSOR INSPECTION M1352008400880 WHEEL SPEED SENSOR CURRENT CHECK A CAUTION Do not connect the battery terminals in reverse as the wheel speed sensor may be damaged 1 Connect the circuit tester to the wheel speed sensor using the special tool extra fine probe MB992006 and measure the sensor current as a single unit Standard value 5 9 to 8 4 mA or 11 8 to 16 8 mA 2 If the measurement value is not within the standard value range replace the wheel speed sensor with a new one WHEEL SPEED SENSOR INSULATION CHECK 1 Connect the circuit tester to the wheel speed sensor using the special tool extra fine probe MB992006 and measure the insulation resistance between terminal No 1 2 and the wheel speed sensor body as a single unit Standard value 5 MQ or more 2 If the insulation resistance is not within the standard value range replace the wheel speed sensor with a new one TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 278 G AND YAW RATE SENSOR G AND YAW RATE SENSOR REMOVAL AND INSTALLATION M1355004500204 A CAUTION e Do not use an impa
38. Brake Pedal P 35A 25 2 Connect the circuit tester Q range to the stoplight switch connector terminal Nos 1 and 2 3 When continuity does not exist with the plunger pressed from the outer case end face by the dimension shown in the figure and when continuity exists with the plunger released the switch is in good condition Q Is the check result normal YES Go to Step 9 NO Replace the stoplight switch Refer to GROUP 35A Brake Pedal P 35A 25 Then go to Step 11 STEP 9 Brake booster check Refer to GROUP 35A On vehicle Service P 35A 15 Q Is the check result normal YES Go to Step 10 NO Replace the brake booster Refer to GROUP 35A Master Cylinder Assembly and Brake Booster P 35A 27 Then go to Step 11 STEP 10 Check whether the DTC is reset Q Is DTC C2001 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 11 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 11 Check whether the DTC is reset Q Is DTC C2001 set YES Return to Step 1 NO The procedure is complete TSB Revision 35C 140 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC C1000 Abnormality in stoplight switch circuit Connectors C 43 C 47 c Connectors C 304 C 312 ETACS ECU lt AC708972AL AC708950Al A CAUTION e If there is any problem in
39. Current trouble Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the wheel speed sensor e Wheel bearing malfunction e Deformation of the magnetic encoder for wheel speed detection Adhesion of foreign materials on the magnetic encoder for wheel speed detection Malfunction of wheel speed sensor Improper installation of the wheel speed sensor ABS ECU malfunction Disturbance of magnetization pattern for magnetic encoder for wheel speed detection TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 80 DIAGNOSIS e The number of poles on the magnetic encoder for wheel speed detection the number of N pole and S pole is changed Past trouble e When DTC No C102B is also set perform the diagnosis with a particular emphasis on the wiring harness and con nector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshoot ing Inspection Service Points P 00 16 e When DTC No C102B is not set simultaneously the follow ings can be suspected Wheel s spinning Unstable vehicle attitude spin External noise interference Vehicle ran with the parking brake applied Only two wheels are rotated on a drum tester DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e M
40. DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1041 set YES Return to Step 1 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 85 DIAGNOSIS DTC C1042 Abnormality in periodical signal for FR wheel speed sensor A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre que
41. GROUP 35A Brake Pedal P 35A 25 Then go to Step 9 STEP 6 Brake drag check Check the brake drag force Refer to GROUP 35A On vehicle Service P 35A 24 Q Is the check result normal YES Go to Step 7 NO Adjust the brake drag and then go to Step 9 STEP 7 Brake booster check Refer to GROUP 35A On vehicle Service P 35A 15 Q Is the check result normal YES Go to Step 8 NO Replace the brake booster Refer to GROUP 35A Master Cylinder Assembly and Brake Booster P 35A 27 Then go to Step 9 STEP 8 Check whether the DTC is reset Q Is DTC C121E set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 9 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 135 STEP 9 Check whether the DTC is reset Q Is DTC C121E set YES Return to Step 1 NO The procedure is complete DTC C2000 Abnormality in wheel fluid pressure sensor circuit A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake
42. Is any DTC set YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 20 NO Goto Step 3 STEP 3 Scan tool diagnostic trouble code for other systems Use scan tool to check that the ETACS ECU related diagnostic trouble code is set Q Is any DTC set YES Troubleshoot the relevant diagnostic trouble code and then go to Step 4 NO Go to Step 4 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 166 DIAGNOSIS STEP 4 ETACS ECU coding data check Check the following coding data stored in ETACS ECU Refer to GROUP 00 Coding Table P 00 39 Vehicle line OK LANCER EVO Transmission OK Vehicles without TC SST 5MT OK Vehicles with TC SST TC SST Engine type OK D4 V V T 2 0L TC Engine power OK Normal Chassis Type for A S C OK Type 1 Final drive OK AWD FF Base Transfer OK ACD SAS OK Present AWD OK Not present TCM OK Vehicles without TC SST Not present OK Vehicles with TC SST Present ACDAYC OK Present Q Is the check result normal YES Go to Step 5 NO Replace the ETACS ECU Refer to GROUP 54A ETACS ECU P 54A 676 Then go to Step 5 STEP 5 Check whether the DTC is reset 1 Ignition switch LOCK OFF position 2 Ignition switch ON position Q Is DTC C2206 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 6 NO The procedure is complete STEP 6 Check whe
43. Measure the voltage between the wheel speed sensor power supply terminal signal terminal No 36 and the body ground as well as between the ground terminal No 37 and the body ground OK 1 volt or less Q Is the check result normal YES Goto Step 5 NO Not normal at terminal 34 or 33 Go to Step 6 STEP 5 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 36 and the body ground as well as between the ground terminal No 37 and the body ground OK No continuity Q Is the check result normal YES Goto Step 8 NO Not normal at the terminal No 36 or 37 Go to Step 6 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 36 DIAGNOSIS STEP 6 Connector check Connector check A 05 ASC ECU connector C 45 intermediate connector D 18 wheel speed sensor lt RL gt connector Q Is the check result normal YES Go to Step 7 NO Repair the defective connector Then go to Step 13 STEP 7 Wiring harness check between A 05 ASC ECU connector terminal No 36 and D 18 wheel speed sensor lt RL gt connector terminal No 1 and between A 05 ASC ECU connector termi
44. P 35C 28 NO Go to Step 4 STEP 4 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt FR gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 5 NO Reinstall the wheel speed sensor lt FR gt correctly Refer to P 35C 274 Then go to Step 9 STEP 5 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 6 NO Replace the wheel speed sensor lt FR gt Refer to P 35C 274 Then go to Step 9 STEP 6 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt FR gt for loose ness Refer to GROUP 26 On vehicle Service P 26 7 Q Is the check result normal YES Go to Step 7 NO Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 7 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Oil seal Q Is the check result normal PSS YES Goto Step 8 Magnetic NO Adhesion of foreign materials Clean the encoder encoder so as not to disturb the magnetization pattern on the Pa encoder while taking care of the magnet magnetic wl Wheel substance and magnetic attraction bearing NO Deformation Re
45. Return to Step 1 NO This diagnosis is complete TSB Revision 35C 62 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC C1032 Abnormality in RR wheel speed sensor signal Connector A 05 ee AC708948AB Connector C 47 AC708950 AE Connector D 09 Ke SS a AC708955 AH A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed TSB Revision ACTIVE SKID CONTROL SYST
46. Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 STEP 2 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if the diagnostic trouble code is set in the combination meter and ETACS ECU Q Is any DTC set YES Carry out the diagnosis for the DTC NO Goto Step 3 STEP 3 Brake fluid level check Check that the brake fluid is filled up to the MIN level or higher Q Is the check result normal YES Go to Step 5 NO Go to Step 4 STEP 4 Brake pad check Refer to GROUP 35A On vehicle Service Brake Pad Check P 35A 17 Q Is the check result normal YES Fill the brake fluid up to the MAX level Then go to Step 18 NO Replace the brake pad Refer to GROUP 35A On vehicle Service Brake Pad Replacement P 35A 18 Then go to Step 18 STEP 5 Brake fluid level switch check Refer to GROUP 35A On vehicle Service Brake Fluid Level Switch Check P 35A 17 Q Is the check result normal YES Go to Step 6 NO Replace the reservoir tank assembly Refer to GROUP 35A Master Cylinder Assembly and Brake Booster Assembly P
47. Scan tool service data Check the following service data Refer to P 35C 255 e Item 08 Lateral G sensor e Item 09 G sensor e Item 12 Yaw rate sensor Q Is the check result normal YES Go to Step 6 NO Replace the G and yaw rate sensor Refer to P 35C 278 Then go to Step 6 STEP 6 Check whether the DTC is reset Q Is DTC C2204 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 7 NO The procedure is complete STEP 7 Check whether the DTC is reset Q Is DTC C2204 set YES Return to Step 1 NO The procedure is complete DTC C2111 Brake fluid pressure sensor power supply circuit low input DTC C2112 Brake fluid pressure sensor power supply circuit high input A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 177 DIAGNOSIS CIRCUIT OPERATION When the brake pedal is depressed the master cylinder pres sure sensor integrated in the hydr
48. Step 3 NO The procedure is complete STEP 3 Check whether the DTC is reset Q Is DTC C2000 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 4 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 4 Check whether the DTC is reset Q Is DTC C2000 set YES Return to Step 1 NO The procedure is complete DTC C2001 Abnormality in wheel fluid pressure sensor output signal A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e The wheel cylinder pressure sensor is integrated into the hydraulic unit It converts the signal of brake fluid pressure in wheel cylinder of each wheel to the voltage value then outputs the value to ASC ECU e The wheel cylinder pressure sensor contains the following two signal output sections Fluid pressure signal output sec tion and fluid pressure and temperature signal output sec tion TSB Revision ACTI
49. TC SST Present ACDAYC OK Present Q Is the check result normal YES Go to Step 6 NO Replace the ETACS ECU Refer to GROUP 54A ETACS ECU P 54A 676 Then go to Step 10 STEP 6 Engine control module coding data check Using the scan tool check if there is any abnormality to the coding data stored in the engine control module Refer to GROUP 00 Coding Table P 00 39 Q Is the check result normal YES Go to Step 7 NO Replace the engine control module Refer to GROUP 13A Engine Control Module P 13A 920 Then go to Step 10 TSB Revision 35C 218 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 7 Check of ETACS ECU part number Check the part number of ETACS ECU Q Is the check result normal YES Go to Step 8 NO Replace the ETACS ECU Refer to GROUP 54A ETACS ECU P 54A 676 Then go to Step 10 STEP 8 Check of ASC ECU part number Check the part number of ASC ECU Q Is the check result normal YES Go to Step 9 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 10 STEP 9 Check whether the DTC is reset Q Is DTC U1417 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 10 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 10 Check whether the DTC is reset Q Is DTC U1417 set YES Return to Step 1 NO The pr
50. Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 4 STEP 2 Scan tool diagnostic trouble code Check that diagnostic trouble codes U0100 U0101 U0126 U0141 U0136 and U0251 are set in ASC ECU Q Is any DTC set YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 20 NO Goto Step 3 STEP 3 M U T IIl diagnostic trouble code for other systems Using scan tool MB991958 check if the diagnostic trouble codes are set from the engine control module transaxle assembly with built in ECU lt TC SST gt S AWC ECU and ETACS ECU Q Is any DTC set YES Perform troubleshooting for the diagnostic trouble code that is set Then go to Step 4 NO Go to Step 4 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 161 STEP 4 ETACS ECU coding data check Check the following coding data stored in ETACS ECU Refer to GROUP 00 Coding Table P 00 39 Vehicle line OK LANCER EVO Transmission OK Vehicles without TC SST 5MT OK Vehicles with TC SST TC SST Engine type OK D4 V V T 2 0L TC Engine power OK Normal Chassis Type for A S C OK Type 1 Final drive OK AWD FF Base Transfer OK ACD SAS OK Present AWD OK Not present TCM OK Vehicles without TC SST Not p
51. body ground OK System voltage Q Is the check result normal YES Go to Step 13 NO Go to Step 15 STEP 13 Connector check A 05 ASC ECU connector C 47 intermediate connector D 09 wheel speed sensor lt RR gt connector Q Is the check result normal YES Go to Step 14 NO Repair the defective connector Then go to Step 16 STEP 14 Wiring harness check between A 05 ASC ECU connector terminal No 43 and D 09 wheel speed sensor lt RR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 42 and D 09 wheel speed sensor lt RR gt connector terminal No 2 e Open circuit check of wheel speed sensor lt RR gt circuit Q Is the check result normal YES Go to Step 15 NO Repair the wiring harness Then go to Step 16 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 68 DIAGNOSIS STEP 15 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1032 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 16 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 16 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more
52. brake fluid is not filled in the hydraulic unit PROBABLE CAUSES e Different hydraulic unit For delivery to factory e ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 V C I e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1395 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 157 DIAGNOSIS DTC C121C Torque request signal rejection A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERAT
53. bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C2104 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Fusible link check Check the fusible link No 27 Visually check for open circuit in the fusible link No 27 Q Is the check result normal YES Go to Step 4 NO Replace the fusible link No 27 STEP 4 Battery check Refer to GROUP 54A Battery Test P 54A 9 Q Is the battery in good condition YES Go to Step 5 NO Charge or replace the battery STEP 5 Charging system check Refer to GROUP 16 Output Current Test P 16 8 Q Is the charging system in good condition YES Go to Step 6 NO Repair or replace the charging system component s TSB Revision A ACTIVE SKID CONTROL SYSTEM ASC 35C 120 DIAGNOSIS STEP 6 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the voltage between the terminal No 32 and the body ground OK System voltage Q Is the check result normal YES Go to Step 8 NO Go
54. check result normal YES Go to Step 14 NO Reinstall the wheel speed sensor lt RL gt correctly Refer to P 35C 274 Then go to Step 17 STEP 14 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt RL gt for loose ness Refer to GROUP 27 On vehicle Service P 27 33 Q Is the check result normal YES Go to Step 15 NO Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 15 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Go to Step 16 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 16 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1048 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 17 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Mal
55. codes and failure infor mation in the EEPROM NOTE EEPROM Electrical Erasable and Programmable ROM TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 191 DTC SET CONDITIONS This diagnostic trouble code is set under the cases below e Trouble information stored in the EEPROM is not reliable e ASC ECU power supply is shut down while the trouble information is being written to EEPROM PROBABLE CAUSES e Disconnection of the ASC ECU connector or the battery ter minal when the ignition switch is ON Loose battery terminal Abnormality in battery Damaged wiring harness and connectors ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q ls DTC C1608 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Battery check Refer to GROUP 54A Battery Test P 54A 9 Q Is the battery in good condition YES Go to Step 4 NO Repair or rep
56. control function and the skid control function By the integrated control with the anti lock brake system the system stabilizes the vehicle attitude and at the same time secures the driving force TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 3 GENERAL INFORMATION CONSTRUCTION DIAGRAM 16_ 10 SaaS x O Sl a ay e SERVICE SERVICE e 2e 2e e REQUIRED CHECK REQUIRED 7 8 9 22 AC708742AB TSB Revision 35C 4 ACTIVE SKID CONTROL SYSTEM ASC GENERAL INFORMATION MAIN COMPONENTS AND FUNCTIONS Parts name Functional description Sensor Wheel speed sensor Outputs the frequency pulse signal in proportion to the rotation speed of each wheel to ASC ECU Magnetic encoder for wheel speed detection When the magnetic encoder for wheel speed detection a plate on which north and south pole sides of the magnets are arranged alternately rotates the wheel speed sensor outputs frequency pulse signal in proportion to each wheel speed Stoplight switch Outputs the signal indicating whether the brake pedal is depressed or not to ASC ECU G and yaw rate sensor Detects the yaw rate and longitudinal and lateral acceleration of a vehicle then outputs the signal to ASC ECU via the CAN line Steering wheel sensor Detects the steering angle of steering wheel and outputs the signal to ASC ECU via the CAN bus
57. control module sets a DTC Refer to GROUP 13A Troubleshooting P 13A 44 Q Is any DTC set YES Troubleshoot the diagnostic trouble code of engine control module Refer to GROUP 13A Troubleshooting P 13A 44 Then go to Step 5 NO Go to Step 4 STEP 4 Check whether the DTC is reset 1 Ignition switch LOCK OFF position 2 Ignition switch ON position Q Is DTC C2203 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 5 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 5 Check whether the DTC is reset 1 Ignition switch LOCK OFF position 2 Ignition switch ON position Q Is DTC C2203 set YES Return to Step 1 NO The procedure is complete TSB Revision a ACTIVE SKID CONTROL SYSTEM ASC 35C 164 DIAGNOSIS DTC C2206 Re execution of variant coding A CAUTION e If diagnostic trouble code No C2206 is set in ASC ECU always diagnose the CAN bus lines If there is any fault in the CAN bus lines an incorrect DTC may be set e Whenever the ECU is replaced ensure that the commu nication circuit is normal e When diagnostic trouble code No C2206 is set in ASC ECU the diagnostic trouble code may also be set in ETACS ECU When the diagnostic trouble code is set in ETACS ECU perform the diagnosis of the diagnostic trouble code for ETACS ECU first e When the hydraul
58. diagnostic trouble code No C121E Refer to P 35C 132 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 138 DIAGNOSIS STEP 4 Scan tool service data Check the following service data Refer to P 35C 255 Item 129 FL wheel cylinder pressure Item 130 FR wheel cylinder pressure Item 131 RL wheel cylinder pressure Item 132 RR wheel cylinder pressure Q Is the check result normal YES Go to Step 5 NO Go to Step 10 STEP 5 Brake drag check Check the brake drag force Refer to GROUP 35A On vehicle Service P 35A 24 Q Is the check result normal YES Go to Step 6 NO Adjust the brake drag and then go to Step 11 STEP 6 Brake pedal check Refer to GROUP 35A On vehicle Service P 35A 12 Q Is the check result normal YES Go to Step 7 NO Adjust the brake pedal height to the standard value Refer to GROUP 35A On vehicle Service P 35A 12 Then go to Step 11 STEP 7 Check for stoplight switch installation Refer to GROUP 35A On vehicle Service P 35A 12 Q Is the check result normal YES Go to Step 8 NO Install the stoplight switch correctly Refer to GROUP 35A On vehicle Service P 35A 12 Then go to Step 11 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 139 No continuity Continuity HF AUN 4 mm 0 16 in ACX00671AE DIAGNOSIS STEP 8 Stoplight switch continuity check 1 Remove the stoplight switch Refer to GROUP 35A
59. exists Continuity exists between terminal No 3 and No 4 TSB Revision 2 ACTIVE SKID CONTROL SYSTEM ASC 35C 272 HYDRAULIC UNIT HYDRAULIC UNIT REMOVAL AND INSTALLATION NOTE ASC ECU is located in the hydraulic unit A CAUTION When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steer ing wheel sensor G and yaw rate sensor brake fluid pressure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 M1355005600196 Pre removal operation Post installation operation e Strut tower bar removal Refer to GROUP 42A Strut e Brake fluid refilling and air bleeding Refer to GROUP 35A Tower Bar P 42A 15 On vehicle Service Brake Fluid Level Inspection and e Brake fluid draining Bleeding P 35A 16 e Strut tower bar installation Refer to GROUP 42A Strut Tower Bar P 42A 15 e Hydraulic unit check Refer to P 35C 263 ak sailtnn 12 2 ft lb oly t o 10 2 N m 13 2 N m fel mu 89 17 in Ib 111 22 in lb ig gt s E ee in D m we _ 9 i B sel e fe 10 i a 11 2 N m 3 aN 98 17 in lb 11 NO a 4N m 18 3 ft lb AC611928AB Removal steps Removal steps Continued lt lt A gt gt 1 ASC ECU harness connector 6 Hydraulic unit ASC ECU and 2 Wheel spe
60. fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION The wheel cylinder pressure sensor is integrated into the hydraulic unit It converts the signal of brake fluid pressure in wheel cylinder of each wheel to the voltage value then outputs the value to ASC ECU DTC SET CONDITIONS This diagnostic trouble code is set when the voltage value which was converted from the signal of brake fluid pressure in wheel cylinder of each wheel and sent by the wheel cylinder pressure sensor to ASC ECU is outside the standard range PROBABLE CAUSES e Damaged wiring harness and connectors e Malfunction of hydraulic unit with built in wheel cylinder pressure sensor DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness TSB Revision 35C 136 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C2000 set YES Go to
61. harness and connectors Noise interference Malfunction of wheel speed sensor ASC ECU malfunction Past trouble e Carry out the diagnosis with a particular emphasis on the wiring harness and connector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshooting Inspection Service Points P 00 16 DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C102B set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool service data Check the following service data Refer to P 35C 255 e Item No 04 RR wheel speed sensor Q Is the check result normal YES Go to Step 12 NO Goto Step 4 TSB Revision 35C 40 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CK Check harness ASC ECU
62. higher Q Is DTC C1011 set YES Return to Step 1 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 49 DTC C101C Abnormality in FR wheel speed sensor signal Connectors A 03 A 05 AN AC708948AC A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed e The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed DTC SET CONDITIONS ASC ECU monitors the signals from each wheel speed sensor while the vehicle is being
63. higher Q Is DTC C1014 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 9 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 9 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1014 set YES Return to Step 1 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 72 DIAGNOSIS DTC C101F Mutual monitoring of FR wheel speed sensor A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the w
64. lines Local CAN DTC SET CONDITIONS These diagnostic trouble codes will be set under the cases below DTC U0251 e Signals sent from S AWC ECU to ASC ECU cannot be received for a specified period DTC U0440 e Signals sent from S AWC ECU to ASC ECU have an error DTC U0435 e A brake control request of outside the specified range is output by S AWC ECU PROBABLE CAUSES e Wiring harness or connector failure in special CAN bus lines Local CAN between ASC ECU and S AWC ECU e S AWC ECU malfunction e ASC ECU malfunction TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 209 DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Are DTC U0251 U0440 and U0435 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Diagnostic trouble code check of other systems using scan tool MB991958 Using scan tool MB991958 check if a diagnostic trouble code is set in S AWC ECU Q Is o
65. may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the steering wheel sensor is replaced always perform calibration to make ASC ECU learn the neutral point Refer to P 35C 267 e When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Steering wheel sensor stores the neutral position learned using scan tool MB991958 When the neutral position has not been learned the steering wheel sensor outputs the signal indicating that the learning has not been performed DTC SET CONDITIONS This diagnostic trouble code is set when it is detected that the steering wheel sensor has not learned the neutral position PROBABLE CAUSES e Neutral position of steering wheel sensor not learned e Steering wheel sensor malfunction e ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB99
66. rate sensor supply voltage Brake fluid pressure sensor Low input P 35C 176 power supply circuit Brake fluid pressure sensor High input power supply circuit Abnormality in G and yaw Low voltage below 6 5 0 5 V P 35C 178 rate sensor operation voltage Abnormality in G and yaw High voltage 18 0 1 0 V or rate sensor operation voltage more Abnormality in sensor calibration P 35C 182 Abnormality in steering wheel sensor signal P 35C 184 TSB Revision 35C 22 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Item Reference page Abnormality in steering wheel Steering wheel sensor neutral sensor initialization point not learned P 35C 187 Internal abnormality in steering wheel sensor P 35C 188 Implausible diagnosis data P 35C 190 Abnormality in valve calibration P 35C 196 Bus off P 35C 198 Engine time out error TC SST time out error Steering wheel sensor time out error ETACS time out error AWC time out error P 35C 199 G and yaw rate sensor message time out error message error P 35C 202 Engine malfunction detected P 35C 205 Communication error in steering wheel sensor P 35C 206 AWC time out error Local CAN Communication error in AWC Local CAN AWC signal abnormality Local CAN G and yaw rate sensor bus off P 35C 208 P 35C 210 Variant coding not completed P 35C 213
67. sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU communicates with the engine control module TC SST ECU steering wheel sensor ETACS ECU and AWC ECU via the CAN bus lines DTC SET CONDITIONS The diagnostic trouble code is stored if ASC ECU cannot receive the signal sent from other ECU for a specified period TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 200 DIAGNOSIS PROBABLE CAUSES DTC U0100 e Wiring harness or connector failure of CAN bus line e Engine ECU malfunction e ASC ECU malfunction DTC U0101 Wiring harness or connector failure of CAN bus line Malfunction of TC SST ECU ASC ECU malfunction Interchanging of ETACS ECU DTC U0126 e Damaged wiring harness or connector in CAN bus line e Malfunction of steering wheel sensor e Malfunction of ASC ECU DTC U0141 e Wiring harness or connector failure of CAN bus line e Malfunction of ETACS ECU e ASC ECU malfunction DTC U0136 e Wiring harness or connector failure of CAN bus line e AWC ECU malfunction e ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result norma
68. sensor A CAUTION Cl If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 RCUIT OPERATION Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed DTC SET CONDITIONS ASC ECU monitors the signals from each wheel speed sensor while the vehicle is being driven If any abnormality below is detected in the sensor signals ASC ECU sets the relevant diagnostic trouble code Missing wheel speed sensor signal Wheel speed sensor signal continuously indicates lower value than the values of other wheel speed sensors PROBABLE CAUSES
69. sensor is incorporated in the hydraulic unit When the brake pedal is depressed the pressure sensor detects the brake pressure applied from the master cylinder converts this pressure into the voltage signal and then outputs the signal DTC SET CONDITIONS If the pressure sensor output signal is outside the standard value range this diagnostic trouble code is set PROBABLE CAUSES e Incorrect brake pedal height e Incorrect adjustment of stoplight switch e Master cylinder malfunction e Brake booster malfunction e ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 131 STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C121D set YES Go to Step 3 NO The procedure is complete STEP 3 Brake pedal check Refer to GROUP 35A On vehicle Service P 35A 12 Q Is the check result normal YES Go to Step 4 NO Adjust the brake pedal heig
70. set if any malfunction below is found e Lateral G value or yaw rate value output from G and yaw rate sensor is abnormal TSB Revision x ACTIVE SKID CONTROL SYSTEM ASC 35C 172 DIAGNOSIS e This diagnostic trouble code is set when ASC ECU deter mines that an abnormality is present by comparing the lat eral G value and yaw rate values output from G and yaw rate sensor with the wheel speed value output from wheel speed sensor and with the steering wheel angle output from steering wheel sensor PROBABLE CAUSES e Improper installation of the G and yaw rate sensor e Gand yaw rate sensor malfunction e Steering wheel sensor malfunction e Improper installation of steering wheel sensor e Malfunction of wheel speed sensor e ASC ECU malfunction e External noise interference DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 Check for diagnostic trouble codes of other systems Check if diagnostic trouble code No U0125 is also set in ASC ECU Q Is DTC U0125 set Y
71. speed detection encoder Wheel bearing malfunction Improper installation of the wheel speed sensor Deformation of the wheel speed detection encoder Disturbance of magnetization pattern for wheel speed detection encoder e Missing teeth of the wheel speed detection encoder DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1048 set YES Go to Step 3 NO This diagnosis is complete TSB Revision 35C 106 ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CH DIAGNOSIS STEP 3 Scan tool diagnostic trouble code Check that DTC No C1020 C1027 C102A and C1043 are simultaneously set Q Are DTC C1020 C1027 C102A and C1043 also set YES Carry out the diagnosis for the diagnostic trouble codes that are set and then go to Step 5 NO Go to Step 4 STEP 4 Scan tool service data Check the follow
72. steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU receives vehicle information from the engine control module and stores it DTC SET CONDITIONS This diagnostic trouble code is set when ASC ECU cannot receive the vehicle information after the ignition switch is turned ON from the engine control module PROBABLE CAUSES Malfunction of the CAN bus Engine ECU malfunction ASC ECU malfunction First ignition switch ON after replacement of ASC ECU DIAGNOSIS Required Special Tools MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 163 STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line 1 Ignition switch LOCK OFF 2 Ignition switch ON Q Is DTC C2203 set YES Go to Step 3 NO The procedure is complete STEP 3 Scan tool diagnostic trouble code for other systems Check if the engine
73. terminal No 45 or 46 Go to Step 10 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CD 35C 47 DIAGNOSIS STEP 10 Connector check A 05 ASC ECU connector A 11 wheel speed sensor lt FL gt connector Q Is the check result normal YES Go to Step 11 NO Repair the defective connector Then go to Step 16 STEP 11 Wiring harness check between A 05 ASC ECU connector terminal No 45 and A 11 wheel speed sensor lt FL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 46 and A 11 wheel speed sensor lt FL gt connector terminal No 2 e Short circuit check of wheel speed sensor lt FL gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt FL gt Refer to P 35C 274 Then go to Step 16 NO Repair the wiring harness Then go to Step 16 STEP 12 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 45 and the body ground OK System voltage Q Is the check result normal YE
74. the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ETACS ECU sends the ON signal generated when the brake pedal is depressed and OFF signal generated when the pedal is released to ASC ECU via CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is set in the following case e The vehicle has run for a long time with the stoplight switch turned ON e The OFF status of the stoplight switch does not match the vehicle behavior PROBABLE CAUSES Improper adjustment of stoplight switch installation position Malfunction of the stoplight switch Malfunction of the stoplight Damaged wiring harness and connectors Malfunction of ETACS ECU Malfunction of the ASC ECU TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 141 DIAGNOSIS DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus
75. the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C2116 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 11 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 TSB Revision 35C 130 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 11 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C2116 set YES Return to Step 1 NO This diagnosis is complete DTC C121D Abnormality in brake fluid pressure sensor circuit A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION The pressure
76. the check result normal YES Go to Step 5 NO Reinstall the wheel speed sensor lt FL gt correctly Refer to P 35C 274 Then go to Step 16 STEP 5 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 6 NO Replace the wheel speed sensor lt FL gt Refer to P 35C 274 Then go to Step 16 STEP 6 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt FL gt for loose ness Refer to GROUP 26 On vehicle Service P 26 7 Q Is the check result normal YES Go to Step 7 NO Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 7 Check of wheel speed detection encoder Oil seal Check the encoder for adhesion of foreign materials or defor mation mi Q Is the check result normal Aig YES Go to Step 8 Magnetic NO Adhesion of foreign materials Clean the encoder encoder so as not to disturb the magnetization pattern on the Pa encoder while taking care of the magnet magnetic ie I ie Wheel substance and magnetic attraction bearing NO Deformation Replace the front hub assembly Refer AC704652AB to GROUP 26 Front Axle Hub Assembly P 26 9 TSB Revision 35C 46 ACTIVE SKID CONTROL SYSTEM ASC Check harness MB9919
77. to Step 7 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CN STEP 7 Connector check A 05 ASC ECU connector Q Is the check result normal YES An open or short circuit may be present in the solenoid valve power supply circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 32 and the fusible link No 27 NO Repair the defective connector TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 121 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CO DIAGNOSIS STEP 8 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the terminal No 16 and the body ground as well as between the terminal No 47 and the body ground OK Continuity exists 2 Q or less Q Is the check result normal YES Go to Step 10 NO Goto Step 9 STEP 9 Connector check A 05 ASC ECU connector Q Is the check result normal YES An open circuit may be present in the ground circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 16 and the body ground as well as between the terminal No 47 and the body ground NO Repair the defective connecto
78. wheel speed sensor circuit power supply terminal signal terminal No 36 and the body ground OK System voltage Q Is the check result normal YES Go to Step 10 NO Goto Step 12 STEP 10 Wiring harness check between A 05 ASC ECU connector terminal No 36 and D 18 wheel speed sensor lt RL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 37 and D 18 wheel speed sensor lt RL gt connector terminal No 2 e Open circuit check of wheel speed sensor lt RL gt circuit Q Is the check result normal YES Go to Step 11 NO Repair the wiring harness Then go to Step 17 STEP 11 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 13 NO Replace the wheel speed sensor lt RL gt Refer to P 35C 274 Then go to Step 17 STEP 12 Connector check A 05 ASC ECU connector C 45 intermediate connector D 18 wheel speed sensor lt RL gt connector Q Is the check result normal YES Go to Step 16 NO Repair the defective connector Then go to Step 17 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 109 Rear wheel hub assembly Rear Wheel bearing Magnetic encoder AC608248AB DIAGNOSIS STEP 13 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt RL gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the
79. 09 wheel speed sensor lt RR gt connector terminal No 2 e Open circuit check of wheel speed sensor lt RR gt circuit Q Is the check result normal YES Go to Step 11 NO Repair the wiring harness Then go to Step 17 STEP 11 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 13 NO Replace the wheel speed sensor lt RR gt Refer to P 35C 274 Then go to Step 17 STEP 12 Connector check A 05 ASC ECU connector C 47 intermediate connector D 09 wheel speed sensor lt RR gt connector Q Is the check result normal YES Go to Step 16 NO Repair the defective connector Then go to Step 17 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 115 Rear wheel hub assembly Rear Wheel bearing Magnetic encoder AC608248AB DIAGNOSIS STEP 13 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt RR gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 14 NO Reinstall the wheel speed sensor lt RR gt correctly Refer to P 35C 274 Then go to Step 17 STEP 14 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt RR gt for loose ness Refer to GROUP 27 O
80. 1042 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt FR gt for loose ness Refer to GROUP 26 On vehicle Service P 26 7 Q Is the check result normal YES Go to Step 4 NO Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 4 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Goto Step 5 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 5 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1042 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 6 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 TSB Revision ACTIVE SKID CO
81. 1958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 TSB Revision 35C 188 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C121A set YES Go to Step 3 NO The procedure is complete STEP 3 Steering wheel sensor calibration Perform calibration of the steering wheel sensor Refer to P 35C 267 Q Has the calibration succeeded YES Go to Step 4 NO Replace the steering wheel sensor Refer to P 35C 279 Then go to Step 4 STEP 4 Check whether the DTC is reset Q Is DTC C121A set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 5 NO The procedure is complete STEP 5 Check whether the DTC is reset Q Is DTC C121A set YES Return to Step 1 NO The procedure is complete DTC C2205 Internal malfunction of steering wheel sensor A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the steering wheel sensor is replaced always perform calibration to make ASC ECU learn the neutral point Refer to P 35C 267 e When the hydrau
82. 1997 ASC ECU A 05 ASC ECU harness connector AC400817CP STEP 7 Connector check A 05 ASC ECU connector Q Is the check result normal YES An open or short circuit may be present in the pump motor power supply circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 1 and the fusible link No 26 NO Repair the defective connector TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 129 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CO DIAGNOSIS STEP 8 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the terminal No 16 and the body ground as well as between the terminal No 47 and the body ground OK Continuity exists 2 Q or less Q Is the check result normal YES Go to Step 10 NO Goto Step 9 STEP 9 Connector check A 05 ASC ECU connector Q Is the check result normal YES An open circuit may be present in the ground circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 16 and the ground as well as between A 05 ASC ECU connector terminal No 47 and the ground NO Repair the defective connector STEP 10 Check whether
83. 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C121E set YES Go to Step 3 NO The procedure is complete STEP 3 Brake pedal check Refer to GROUP 35A On vehicle Service P 35A 12 Q Is the check result normal YES Go to Step 4 NO Adjust the brake pedal height Refer to GROUP 35A On vehicle Service P 35A 12 Then go to Step 9 STEP 4 Check for stoplight switch installation Refer to GROUP 35A On vehicle Service P 35A 12 Q Is the check result normal YES Go to Step 5 NO Install the stoplight switch correctly Refer to GROUP 35A On vehicle Service P 35A 12 Then go to Step 9 TSB Revision 35C 134 ACTIVE SKID CONTROL SYSTEM ASC No continuity Continuity HF AUN 4 mm 0 16 in ACX00671AE DIAGNOSIS STEP 5 Stoplight switch continuity check 1 Remove the stoplight switch Refer to GROUP 35A Brake Pedal P 35A 25 2 Connect the circuit tester Q range to the stoplight switch connector terminal Nos 1 and 2 3 When continuity does not exist with the plunger pressed from the outer case end face by the dimension shown in the figure and when continuity exists with the plunger released the switch is in good condition Q Is the check result normal YES Go to Step 6 NO Replace the stoplight switch Refer to
84. 35A 27 Then go to Step 18 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 223 DIAGNOSIS STEP 6 Connector check C 312 ETACS ECU connector A 09 brake fluid level switch connector Q Is the check result normal YES Go to Step 7 NO Repair the defective connector STEP 7 Voltage measurement at A 09 brake fluid level switch connector 1 Disconnect the connector and measure at the wiring harness side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the terminal No 2 and the body ground OK System voltage Q Is the check result normal YES Go to Step 9 NO Goto Step 8 STEP 8 Voltage measurement at C 312 ETACS ECU connector A CAUTION Keep the C 312 ETACS ECU connector remain connected then disconnect A 09 brake fluid level switch connector 1 Turn the ignition switch to the ON position 2 Measure the voltage between the terminal No 1 and the body ground by backprobing OK Approximately battery voltage Q Is the check result normal YES Repair the wiring harness between C 312 ETACS ECU connector terminal No 1 and A 09 brake fluid level switch connector terminal No 1 NO Replace the ETACS ECU Refer to GROUP 54A ETACS P 54A 676 Then go to Step 18 STEP 9 Wiring harness check Between A 09 brake fluid level switch connector and the body ground Check for an open circuit in the wiring harness between A 09 brake fluid
85. 35C 1 GENERAL INFORMATION SERVICE SPECIFICATIONS DIAGNOSIS 0005 INTRODUCTION TO ASC DIAGNOSIS ASC DIAGNOSTIC TROUBLESHOOTING STRATEGY coraa popia a e 2 aa daa led PRECAUTIONS FOR DIAGNOSIS ABS WARNING LIGHT AND BRAKE WARNING LIGHT INSPECTION DIAGNOSTIC FUNCTION DIAGNOSTIC TROUBLE CODE CHART DIAGNOSTIC TROUBLE CODE PROCEDURES etaa siasa saad apie TROUBLE SYMPTOM CHART SYMPTOM PROCEDURES DATA LIST REFERENCE TABLE ACTUATOR TEST REFERENCE TABLE CHECK AT ECU TERMINALS SPECIAL TOOLS ON VEHICLE SERVICE HYDRAULIC UNIT CHECK GROUP 35C ACTIVE SKID CONTROL SYSTEM ASC CONTENTS 35C 2 IN THE EVENT OF A DISCHARGED 35C 6 BATTERY ooon ad ubaeeeeeca is 35C 266 G AND YAW RATE SENSOR 35C 6 CALIBRATION 5244 oe4on0 odc00 35C 266 35C 6 STEERING WHEEL SENSOR CALIBRATION ooo aoaaa anaana aaau 35C 267 35C 6 MASTER CYLINDER BRAKE FLUID PRESSURE 35C 7 SENSOR CALIBRATION 35C 268 CALIBRATION OF CUT VALVE AND INLET 35C 7 VALVE a a R n a A on 35C 269 350 8 ASC OFF SWITCH 35C 271 35C 20 REMOVAL AND INSTALLATION 35C 271 a INSPECTION 00eee cues 35C 271 penis HYDRAULIC UNIT 35C 272 350 220 REMOVAL AND INSTALLATION 35C 272 35 255 WHEEL SPEED SENSOR 35C 274 35C 257 REMOVAL AND INSTALLATION 35C 274 35C 259 INSPECTION vc o2veedwilavsancsa
86. 35C 242 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 2 Engine control module coding data check Using the scan tool check if there is any abnormality to the fol lowing coding data stored in the engine control module Refer to GROUP 00 Coding Table P 00 39 A S C OK Present Q Is the check result normal YES Go to Step 3 NO Replace the engine control module Refer to GROUP 13A Engine Control Module P 13A 920 Then go to Step 4 STEP 3 Hydraulic unit integrated with ASC ECU check Check that the brake tube is correctly mounted to the hydraulic unit integrated with ASC ECU Refer to P 54A 582 Q Is the check result normal YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 263 Then go to Step 4 NO Connect the brake tubes correctly and repair or replace the external brake lines of the hydraulic unit integrated with ASC ECU STEP 4 Operation check Q Does the skid control TCL operate normally YES The procedure is complete NO Check the brake related components other than the skid control TCL TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 243 DIAGNOSIS Inspection Procedure 11 ASC ECU power supply circuit system Connector A 05 E AC708948 AB Connectors C 309 C 315 C 317 ETACS ECU ale AC708972AS Connectors C 103 130 C 103 B AC708950 AJ A CAUTION When the ASC ECU power supply
87. 4 STEP 4 Scan tool service data Check the following service data Refer to P 35C 255 e Item 68 Allow ESP torque request Q Is the check result normal YES Go to Step 5 NO Replace the engine control module Refer to GROUP 13A Engine Control Module P 13A 920 Then go to Step 5 STEP 5 Check whether the DTC is reset Q Is DTC C121C set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 6 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 6 Check whether the DTC is reset Q Is DTC C121C set YES Return to Step 1 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 159 DTC C1290 CAN time out error A CAUTION e If diagnostic trouble code No C1290 is set in ASC ECU always diagnose the CAN bus lines If there is any fault in the CAN bus lines an incorrect DTC may be set e When the diagnostic trouble code No C1290 is set in ASC ECU a diagnostic trouble code for another system may also be set When the diagnostic trouble code for another system is set carry out diagnosis for that sys tem first e Whenever the ECU is replaced ensure that the commu nication circuit is normal e When the steering wheel sensor is replaced always perform calibration to make ASC ECU learn the neutral point Refer to P 35C 267 e When the hydraulic un
88. 5 is not set the fol lowing conditions may be present Wheel s spinning Unstable vehicle attitude spin External noise interference Vehicle ran with the parking brake applied DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 51 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C101C set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code Check if DTC No C1015 is also set Q Is DTC C1015 also set YES Carry out the diagnosis for code No C1015 Refer to P 35C 28 NO Go to Step 4 STEP 4 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt FR gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 5 NO Reinstall the wheel speed sensor lt FR gt correctly Refer to P 35C 274
89. 958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C2116 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Fusible link check Check the fusible link No 26 Q Is the check result normal YES Go to Step 4 NO Replace the fusible link No 26 TSB Revision A ACTIVE SKID CONTROL SYSTEM ASC 35C 128 DIAGNOSIS STEP 4 Battery check Refer to GROUP 54A Battery Test P 54A 9 Q Is the battery in good condition YES Go to Step 5 NO Charge or replace the battery STEP 5 Charging system check Refer to GROUP 16 Output Current Test P 16 8 Q Is the charging system in good condition YES Go to Step 6 NO Repair or replace the charging system component s STEP 6 Voltage measurement at the A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the voltage between the terminal No 1 and the body ground OK System voltage Q Is the check result normal YES Go to Step 8 NO Go to Step 7 Check harness MB99
90. 97 ASC ECU A 05 ASC ECU harness connector AC400817CB Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CC DIAGNOSIS STEP 8 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 45 and the body ground as well as between the ground terminal No 46 and the body ground OK 1 volt or less Q Is the check result normal YES Goto Step 9 NO Not normal at the terminal No 45 or 46 Go to Step 10 STEP 9 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 45 and the body ground as well as between the ground terminal No 46 and the body ground OK No continuity Q Is the check result normal YES Go to Step 12 NO Not normal at the
91. A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 TECHNICAL DESCRIPTION COMMENT Although it is difficult to determine the trouble cause since it depends on the running status and road surface condition a malfunction of hydraulic circuit may be present if no diagnostic trouble code is detected PROBABLE CAUSES Malfunction of hydraulic unit integrated with ABS ECU Malfunction of hydraulic circuit Malfunction of brake assembly Malfunction of brake booster Malfunction of master cylinder assembly TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 240 DIAGNOSIS DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Check the DTC Using scan tool check the diagnostic trouble code for ASC sys tem Refer to P 35C 20 Q Is the check result normal YES Go to Step 2 NO Carry out the diagnosis for DTC
92. AN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 3 STEP 2 Check whether the DTC is reset Q Is DTC C2200 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 3 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 3 Check whether the DTC is reset Q Is DTC C2200 set YES Return to Step 1 NO This diagnosis is complete DTC C2101 Abnormality in battery voltage high voltage Connector A 05 AC708948AB Connectors C 309 C 315 ETACS ECU AC708972 AM C 130 BR AC708950 AJ TSB Revisi on ACTIVE SKID CONTROL SYSTEM ASC 35C 151 DIAGNOSIS A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU
93. AN bus line Q Is DTC C1044 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt RR gt for loose ness Refer to GROUP 27 On vehicle Service P 27 33 Q Is the check result normal YES Go to Step 4 NO Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 4 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Goto Step 5 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 5 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1044 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 6 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15
94. B Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1049 set YES Go to Step 3 NO This diagnosis is complete TSB Revision 35C 112 ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CK DIAGNOSIS STEP 3 Scan tool diagnostic trouble code Check whether DTC No C102B C1032 C1035 and C1044 are simultaneously set Q Are DTC C102B C1032 C1035 and C1044 also set YES Carry out the diagnosis for the diagnostic trouble codes that are set and then go to Step 5 NO Go to Step 4 STEP 4 Scan tool service data Check the following service data Refer to P 35C 255 e Item No 04 RR wheel speed sensor Q Is the check result normal YES Go to Step 16 NO Goto Step 5 STEP 5 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect t
95. B991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q ls DTC C1035 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code Check if DTC No C102B is also set Q Is DTC C102B also set YES Carry out the diagnosis for code No C102B Refer to P 35C 38 NO Goto Step 4 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 81 Rear wheel hub assembly Rear Wheel bearing Magnetic encoder AC608248AB DIAGNOSIS STEP 4 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt RR gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 5 NO Reinstall the wheel speed sensor lt RR gt correctly Refer to P 35C 274 Then go to Step 9 STEP 5 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 6 NO Replace the wheel speed sensor lt RR gt Refer to P 35C 274 Th
96. BS function e 4 Only for vehicles with TC SST EBD ABS skid control and TCL control status at failure Item EBD ABS Illuminated Skid control Illuminated es Stays on until the vehicle speed reaches 10 km h when the ignition switch is turned to ON next time TCL Abnormality in FL wheel speed sensor circuit Abnormality in FR wheel speed sensor circuit Abnormality in RL wheel speed sensor circuit Abnormality in RR wheel speed sensor circuit Executed Prohibited Prohibited Prohibited Abnormality in FL wheel speed sensor signal Abnormality in FR wheel speed sensor signal Abnormality in RL wheel speed sensor signal Abnormality in RR wheel speed sensor signal Executed TSB Revision Prohibited Prohibited Prohibited ACTIVE SKID CONTROL SYSTEM ASC 35C 14 DIAGNOSIS Item EBD ABS Skid control TCL Mutual monitoring Executed Prohibited Prohibited Prohibited of FL wheel speed sensor Mutual monitoring of FR wheel speed sensor Mutual monitoring of RL wheel speed sensor Mutual monitoring of RR wheel speed sensor Abnormality in Executed Prohibited Prohibited Prohibited periodical signal for FL wheel speed sensor Abnormality in periodical signal for FR wheel speed sensor Abnormality in periodical signal for RL wheel speed sensor Abnormality in periodical
97. C DIAGNOSIS 35C 37 STEP 10 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 11 NO Replace the wheel speed sensor lt RL gt Refer to P 35C 274 Then go to Step 13 STEP 11 Connector check Connector check A 05 ASC ECU connector C 45 intermediate connector D 18 wheel speed sensor lt RL gt connector Q Is the check result normal YES Go to Step 12 NO Repair the defective connector Then go to Step 13 STEP 12 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1020 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 13 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 13 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1020 set YES Return to Step 1 NO This diagnosis is complete TSB Revision 35C 38 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC C102B Abnormality in RR wheel speed sensor circuit Connector A 05 ee AC708948AB Connector C 47 AC708950 AE Connector D 09
98. C1015 is also set perform the diagnosis with a particular emphasis on the wiring harness and con nector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshoot ing Inspection Service Points P 00 16 e When DTC No C1015 is not set simultaneously the follow ings can be suspected Wheel s spinning Unstable vehicle attitude spin External noise interference Vehicle ran with the parking brake applied Only two wheels are rotated on a drum tester DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 74 DIAGNOSIS STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C101F set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code Check if DTC No C1015 is also set Q Is DTC C1015 also set YES Carry out the diagnosis for code No C1015 Refer to
99. CONTROL SYSTEM ASC 35C 41 DIAGNOSIS STEP 6 Connector check A 05 ASC ECU connector C 47 intermediate connector D 09 wheel speed sensor lt RR gt connector Q Is the check result normal YES Go to Step 7 NO Repair the defective connector Then go to Step 13 STEP 7 Wiring harness check between A 05 ASC ECU connector terminal No 43 and D 09 wheel speed sensor lt RR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 42 and D 09 wheel speed sensor lt RR gt connector terminal No 2 e Short circuit check of wheel speed sensor lt RR gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt RR gt Refer to P 35C 274 Then go to Step 13 NO Repair the wiring harness Then go to Step 13 STEP 8 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 43 and the body ground OK System voltage Q Is the check result normal Check harness YES Go to Step 9 NO Goto Step 11 MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CM STEP 9 Wiring harness check betwe
100. CS time out error Extinguished Extinguished Extinguished Extinguished AWC time out error Extinguished Extinguished Extinguished Extinguished G and yaw rate sensor message time out error message error Extinguished Illuminated Illuminated Illuminated Engine malfunction detected Extinguished Extinguished Illuminated Illuminated Communication error in steering wheel sensor Extinguished Extinguished Illuminated Illuminated AWC time out error Local CAN Extinguished Extinguished TSB Revision Extinguished Extinguished ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Brake display warning light brake warning ABS warning light ABS warning display ASC warning display 35C 13 ASC OFF light U0435 Communicatio Local CAN n error in AWC AWC signal abnormality G and yaw rate sensor bus off Local CAN Extinguished Extinguished Extinguished Extinguished Extinguished Illuminated Extinguished Extinguished Illuminated Extinguished Extinguished Illuminated Variant coding not completed Extinguished Illuminated Illuminated Illuminated NOTE e 1 Turns on when two or more wheels are faulty Variant coding value invalid includes faulty installation Extinguished Illuminated e 3 Does not illuminate when there is no effect to the A
101. DTC C1073 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 11 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 126 DIAGNOSIS STEP 11 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1073 set YES Return to Step 1 NO This diagnosis is complete DTC C2116 Abnormality in power supply voltage in pump motor Connector A 05 AC708948AB A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e ASC ECU contains the power supply circuit terminal No 1 for the motor The pump motor is energized by the pump motor switch which is incorporated in ASC ECU e The pump motor switch in ASC ECU i
102. ECU A 05 ASC ECU harness connector AC400817CF DIAGNOSIS STEP 6 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 34 and the body ground as well as between the ground terminal No 33 and the body ground OK No continuity Q Is the check result normal YES Goto Step 9 NO Not normal at terminal 34 or 33 Go to Step 7 STEP 7 Connector check A 05 ASC ECU connector A 03 wheel speed sensor lt FR gt connector Q Is the check result normal YES Go to Step 8 NO Repair the defective connector Then go to Step 17 STEP 8 Wiring harness check between A 05 ASC ECU connector terminal No 34 and A 03 wheel speed sensor lt FR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 33 and A 03 wheel speed sensor lt FR gt connector terminal No 2 e Short circuit check of wheel speed sensor lt FR gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt FR gt Refer to P 35C 274 Then go to Step 17 NO Repair the wiring harness Then go to Step 17 TSB Revision 35C 102 ACTIVE SKID CONTROL SYSTEM ASC
103. ECU connector C 45 intermediate connector D 18 wheel speed sensor lt RL gt connector Q Is the check result normal YES Go to Step 14 NO Repair the defective connector Then go to Step 16 STEP 14 Wiring harness check between A 05 ASC ECU connector terminal No 36 and D 18 wheel speed sensor lt RL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 37 and D 18 wheel speed sensor lt RL gt connector terminal No 2 e Open circuit check of wheel speed sensor lt RL gt circuit Q Is the check result normal YES Go to Step 15 NO Repair the wiring harness Then go to Step 16 TSB Revision 35C 61 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 15 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1027 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 16 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 16 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1027 set YES
104. ECU connector C 46 S AWC ECU connector C 47 intermediate connector C 50 joint connector Q Is the check result normal YES Go to Step 5 NO Repair the connector and then go to Step 8 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 204 DIAGNOSIS STEP 5 Wiring harness check between A 05 ASC ECU connector terminal No 18 and C 38 G and yaw rate sensor connector terminal No 2 between A 05 ASC ECU connector terminal No 19 and C 38 G and yaw rate sensor connector terminal No 3 between C 46 S AWC ECU connector terminal No 9 and C 38 G and yaw rate sensor connector terminal No 2 between C 46 S AWC ECU connector terminal No 10 and C 38 G and yaw rate sensor connector terminal No 3 e Open or short circuit check of communication circuit Q Is the check result normal YES Go to Step 6 NO Repair the wiring harness and then go to Step 8 STEP 6 Check whether the DTC is reset Q Is DTC U0125 set YES Replace the G and yaw rate sensor Refer to P 35C 278 Then go to Step 7 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 7 Check whether the DTC is reset Q Is DTC U0125 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 8 NO The procedure is complete STEP 8 Check whether the DTC is reset Q Is DTC U0125 set YES Return to Step 1 NO The procedure is complete TSB R
105. EFERENCE TABLE The following items of ECU input data can be read using the scan tool 1 The system is normal DIAGNOSIS 35C 255 M1355001500216 Item No Check item Check conditions Normal conditions 01 FL wheel speed sensor Perform a test run of the vehicle The speedometer display and 02 FR wheel speed sensor scan tool display almost agree with each other lt Vehicle 03 RL wheel speed sensor stopped Approximately 0 7 04 RR wheel speed sensor km h 1 1 mph gt 05 Power supply voltage System voltage 10 to 18 V ASC operable range 07 Brake switch input The brake pedal is depressed ON The brake pedal is released OFF 08 Lateral G sensor left Vehicle stopped level 0 11 to 0 11 G turn right turn Running 1to1G 09 G sensor deceleration Vehicle stopped level 0 11 to 0 11 G acceleration Running 1 to 1G 10 Master cylinder pressure The brake pedal is depressed Increases by the amount of the brake pedal depression The brake pedal is released 3 to 3 bar 11 Steering angle left turn Vehicle stopped Steering wheel 6 to 6 deg right turn in neutral position Running Nearly the same as the steering wheel operation angle lt 720 to 720 deg ASC ECU normal detection value gt When removed from vehicle Nearly the same as the Steering wheel sensor as a steering wheel operation angle single unit lt 850 to 850 deg Sensor norma
106. EM ASC DIAGNOSIS 35C 63 DTC SET CONDITIONS ASC ECU monitors the signals from each wheel speed sensor while the vehicle is being driven If any abnormality below is detected in the sensor signals ASC ECU sets the relevant diagnostic trouble code Irregular change in the wheel speed sensor signal Wheel speed sensor signal continuously indicates higher value than the values of other wheel speed sensors PROBABLE CAUSES Current trouble Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the magnetic encoder for wheel speed detection Wheel bearing malfunction Malfunction of wheel speed sensor Damaged wiring harness and connectors External noise interference Improper installation of the wheel speed sensor Deformation of the magnetic encoder for wheel speed detection e ASC ECU malfunction e Disturbance of magnetization pattern for magnetic encoder for wheel speed detection The number of poles on the magnetic encoder for wheel speed detection the number of N pole and S pole is changed Past trouble When DTC No C102B is also set perform the diagnosis with a particular emphasis on the wiring harness and con nector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshoot ing Inspection S
107. EP 2 DTC recheck after repairing the CAN bus line Q Is DTC C2002 set YES Go to Step 3 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 197 DIAGNOSIS STEP 3 Check for diagnostic trouble codes of other systems Check if any diagnostic trouble code other than No C2002 is set in ASC ECU Q Is the check result normal YES Carry out the diagnosis for the diagnostic trouble code that is set Refer to P 35C 20 Then go to Step 4 NO Go to Step 4 STEP 4 Cut valve and inlet valve calibration Refer to P 35C 269 Q Is the calibration performed normally YES Go to Step 7 NO Goto Step 5 STEP 5 Service data check Check the following service data Refer to P 35C 255 e Item No 14 Brake switch Q Is the check result normal YES Go to Step 6 NO Check the stoplight switch Refer to GROUP 35A Stoplight Switch Check P 35A 26 STEP 6 Cut valve and inlet valve calibration Refer to P 35C 269 Q Is the calibration performed normally YES Go to Step 7 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then return to Step 1 STEP 7 Check whether the DTC is reset Q Is DTC C2002 set YES Return to Step 1 NO This diagnosis is complete TSB Revision z ACTIVE SKID CONTROL SYSTEM ASC 35C 198 DIAGNOSIS DTC U0001 Bus off A CAUTION e If there is any problem in the CAN bus lines an incor
108. EP 2 DTC recheck after repairing the CAN bus line Q ls DTC C1073 set YES Go to Step 3 NO The procedure is complete STEP 3 Fusible link check Check the fusible link No 26 Q Is the check result normal YES Go to Step 4 NO Replace the fusible link No 26 STEP 4 Battery check Refer to GROUP 54A Battery Test P 54A 9 Q Is the battery in good condition YES Go to Step 5 NO Charge or replace the battery TSB Revision 35C 124 ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991 o ASC ECU A 05 ASC ECU harness connector AC400817CP DIAGNOSIS STEP 5 Charging system check Refer to GROUP 16 Output Current Test P 16 8 Q Is the charging system in good condition YES Go to Step 6 NO Repair or replace the charging system component s STEP 6 Voltage measurement at the A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the voltage between the terminal No 1 and the body ground OK System voltage Q Is the check result normal YES Go to Step 8 NO Go to Step 7 STEP 7 Connector check A 05 ASC ECU connector Q Is the check result normal YES An open or short circuit may be present in the pump motor power supply c
109. ERAL INFORMATION GENERAL INFORMATION Active skid control ASC has been equipped as a standard e ASC has been added to the transaxle lt twin 35C 2 M1355000200115 e When the skid control function determines that the vehicle behavior is in a critical state it reduces the engine output and applies brake clutch sportronic shift transmission TC SST gt control and AWD lt super all wheel control S AWC 2 gt control and the controls are inte grated to improve the vehicle stability The ASC system integrates the traction control TCL function and skid control function When the TCL function detects the slip of driving wheel for example during startup on slippery road it automatically applies the braking force to the slipping driving wheel At the same time TCL reduces the engine output and prevents the wheel spin when it determines that the engine torque is too high for the road surface friction coefficient force to four wheels independently to control the vehicle behavior avoiding the critical state Brake performance at ASC system failure is ensured by the fail safe function and at the same time the serviceability during service is improved NOTE 1 For the details on twin clutch sportronic shift transmission TC SST refer to technical infor mation manual 2 For the details on super all wheel control S AWC refer to technical information manual The active skid control ASC has the traction
110. ES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 202 Then go to Step 3 NO Goto Step 3 STEP 3 Check whether the DTC is reset Q Is DTC C123C set YES Go to Step 4 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 173 DIAGNOSIS STEP 4 Check of wheel speed sensor related diagnostic trouble code Using scan tool MB991958 check if the wheel speed sen sor related or steering wheel sensor related diagnostic trouble code is set Refer to P 35C 20 Q Is any DTC set YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 20 NO Goto Step 5 STEP 5 Check of G and yaw rate sensor installation status Check that the G and yaw rate sensor is installed correctly Q Is the check result normal YES After checking the G and yaw rate sensor perform the calibration of the G and yaw rate sensor to make ASC ECU relearn the neutral point Refer to P 35C 266 Then go to Step 6 NO Reinstall the G and yaw rate sensor correctly Refer to P 35C 278 Then go to Step 10 STEP 6 Scan tool service data Check the following service data Refer to P 35C 255 e Item 08 Lateral G sensor e Item 12 Yaw rate sensor Q Is the check result normal YES Go to Step 7 NO Replace the G and yaw rate sensor Refer to P 35C 278 Then go to Step 10 STEP 7 Check of steering wheel sensor installation status Ch
111. ES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 13 NO The procedure is complete TSB Revision 35C 182 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 12 Check whether the DTC is reset Q Is DTC C2114 or C2115 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 13 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 13 Check whether the DTC is reset Q Is DTC C2114 or C2115 set YES Return to Step 1 NO The procedure is complete DTC C123A Abnormality in sensor calibration A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e Do not drop the G and yaw rate sensor or subject it toa shock e When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU stores the calibrated value of the G and yaw ra
112. GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C2101 set YES Go to Step 3 NO The procedure is complete STEP 3 Battery terminal check Check that the battery terminal is not loose Q Is the check result normal YES Go to Step 4 NO Securely install the battery terminal Then go to Step 4 STEP 4 Battery check Refer to GROUP 54A Battery Test P 54A 9 Q Is the battery in good condition YES Go to Step 6 NO Charge or replace the battery and then go to Step 5 STEP 5 Charging system check Refer to GROUP 16 Charging System P 16 7 Q Is the charging system in good condition YES Go to Step 6 NO Repair or replace the charging system component s STEP 6 Fusible link check Check the fusible link No 27 and No 34 Check that the fusible link No 27 and No 34 are normal and does not exceed the capacity Q Is the check result normal YES Go to Step 7 NO Replace the fusible link No 27 or No 34 STEP 7 Connector check A 05 ASC ECU connector Q Is the check result normal YES Go to Step 8 NO Repair the defective connector TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 153 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CN DIAGNOSIS STEP 8 Voltage measurement at the A 05 ASC ECU connecto
113. ION ASC ECU sends the signal to the engine control module as necessary to decrease the engine output for ASC system oper ation DTC SET CONDITIONS This diagnostic trouble code is set when the output decrease request is rejected by the engine control module PROBABLE CAUSES Wrong coding Engine ECU malfunction ASC ECU malfunction External noise interference DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C121C set YES Go to Step 3 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 158 DIAGNOSIS STEP 3 M U T IIl other system diagnostic trouble code Using scan tool MB991958 check if a diagnostic trouble code is set in the engine control module Refer to GROUP 13A Troubleshooting P 13A 44 Q Is any DTC set YES Troubleshoot the diagnostic trouble code of engine control module Refer to GROUP 13A Troubleshooting P 13A 44 NO Go to Step
114. IVE SKID CONTROL SYSTEM ASC 35C 252 DIAGNOSIS STEP 1 Check of wheels and tires Perform the following checks e Check of wheel and tire size e Tire wear and deterioration e Tire pressure check NOTE For the tire pressure refer to the tire pressure label attached to the lower section of driver s side door striker Q Is the check result normal YES Go to Step 2 NO Correct the wheels and tires Then go to Step 9 STEP 2 Check the DTC Using scan tool check the diagnostic trouble code for ASC sys tem Refer to P 35C 20 Q Is the check result normal YES Go to Step 3 NO Carry out the diagnosis for the DTC Refer to P 35C 20 Then go to Step 9 STEP 3 Check of brake related components other than hydraulic unit integrated with ASC ECU Perform the following checks and also check that no non gen uine parts are installed e Brake pad check Refer to GROUP 35A On vehicle Ser vice Brake Pad Check P 35A 17 e Brake disc runout check Refer to GROUP 35A On vehicle Service Brake Disc Rotor Check P 35A 21 e Brake drag force check Refer to GROUP 35A On vehicle Service Brake Drag Force Check P 35A 24 Q Is the check result normal YES Go to Step 4 NO Repair or replace the trouble spot Then go to Step 9 STEP 4 Wheel alignment check Perform the following checks and also check that no non gen uine parts are installed e Front wheel alignment check Refer to GROUP 33 On vehicle Service Fr
115. NO Replace the fuse No 17 or the fusible link No 34 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 193 MB991997 A 05 ASC ECU harness connector i R dere ene se SNO D Check harness ASC ECU AC400817CN DIAGNOSIS STEP 8 Voltage measurement at the A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the voltage between the terminal No 2 and the body ground OK System voltage Q Is the check result normal YES Go to Step 15 NO Goto Step 9 STEP 9 Connector check C 309 ETACS ECU connector Q Is the check result normal YES Go to Step 10 NO Repair the defective connector STEP 10 Voltage measurement at the C 309 ETACS ECU connector 1 Disconnect the connector and measure at the wiring harness side connector 2 Measure the voltage between the terminal No 1 and the body ground OK System voltage Q Is the check result normal YES Go to Step 11 NO Repair the wiring harness between C 309 ETACS ECU connector terminal No 1 and the fusible link No 34 STEP 11 Connector check C 315 ETACS ECU connector Q Is the check result normal YES Go to Step 12 NO Repair the defective connector
116. NTROL SYSTEM ASC DIAGNOSIS 35C 87 STEP 6 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1042 set YES Return to Step 1 NO This diagnosis is complete DTC C1043 Abnormality in periodical signal for RL wheel speed sensor A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed e The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the puls
117. ONTROL SYSTEM ASC 35C 144 DIAGNOSIS STEP 12 Wiring harness check between C 43 joint connector and F 06 rear combination light stoplight RH connector 1 Disconnect C 43 joint connector and F 06 rear combination light stoplight RH connector 2 Check the continuity short to ground between C 43 joint connector terminal No 1 and the ground OK No continuity Q Is the check result normal YES Go to Step 13 NO The short circuit may be present in the wiring harness between C 43 joint connector terminal No 1 and F 06 rear combination light stoplight RH connector terminal No 4 Then replace fuse No 2 STEP 13 Check the wiring harness between C 43 joint connector and F 25 rear combination light stoplight LH connector and between C 43 joint connector and F 05 high mounted stoplight connector 1 Disconnect C 43 joint connector F 05 high mounted stoplight connector and F 25 rear combination light stoplight LH connector 2 Check the continuity short to ground between C 43 joint connector terminal No 12 and the ground OK No continuity Q Is the check result normal YES Replace fuse No 2 NO The short circuit may be present in the wiring harness between C 43 joint connector terminal No 12 and F 05 high mounted stoplight connector terminal No 1 or between C 43 joint connector terminal No 12 and F 05 rear combination light stoplight LH connector terminal No 4 Repair the damaged wiring harnes
118. ROUP 52A Trim P 52A 11 Rear wheel speed sensor connector Rear wheel speed sensor grommet Bolt rear wheel speed sensor and knuckle assembly connection Rear wheel speed sensor NOTE The vehicle speed detection encoder is inte grated with the front wheel bearing and the rear hub assembly which cannot be disassembled INSTALLATION SERVICE POINTS gt gt A lt lt FRONT WHEEL SPEED SENSOR GROM MET REAR WHEEL SPEED SENSOR GROMMET INSTALLATION Front wheel speed 1 n u w v K u n Rear wheel speed sensor grommet L AC710757AB TSB Revision Install the front wheel speed sensor grommet and the rear wheel speed sensor grommet to the body panel snugly as shown in the figure 35C 276 lt Section A A gt Sensor harness clip Strut assembl Le y lt p Marking Pace B La eS lt Section B B gt Front wheel Sensor harness clip speed a sensor NR AC706886AB Hydraulic unit integrated with ASC ECU Front wheel speed sensor lt LH gt Marking AC710758AB ACTIVE SKID CONTROL SYSTEM ASC WHEEL SPEED SENSOR gt gt B lt lt SENSOR HARNESS CLIP INSTALLATION As shown in the figure align the edge of front wheel speed sen sor marking with the edge of sensor wiring harness clip then perform the installation gt gt C lt lt FRONT WHEEL SPEED SENSOR CONNECTOR INSTALLATION
119. Refer to P 35C 20 STEP 2 Hydraulic unit integrated with ASC ECU check Check that the brake tube is correctly mounted to the hydraulic unit integrated with ASC ECU Refer to P 35C 263 Q Is the check result normal YES Go to Step 3 NO Connect the brake tubes correctly and repair or replace the external brake lines of the hydraulic unit integrated with ASC ECU STEP 3 Brake operation check Perform the following checks e Brake pedal check Refer to GROUP 35A On vehicle Ser vice Brake Pedal Check P 35A 12 e Brake booster check Refer to GROUP 35A On vehicle Service Brake Booster Operation Check P 35A 15 e Check valve check Refer to GROUP 35A On vehicle Ser vice Check Valve Operation Check P 35A 16 Q Can any fault be found with the brake operation YES Check the brake related parts and repair if necessary Then go to Step 4 NO Go to Step 4 STEP 4 Hydraulic unit check Perform the following actuator tests Refer to P 35C 257 Item 01 FL wheel ABS drive Item 02 FR wheel ABS drive Item 03 RL wheel ABS drive Item 04 RR wheel ABS drive Item 05 FL wheel TCL drive Item 06 FR wheel TCL drive Item 07 RL wheel TCL drive Item 08 RR wheel TCL drive Q Is the check result normal YES The procedure is complete NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 241 DIAGNOSIS Inspect
120. S STEP 5 Check whether the DTC is reset Q Is DTC C2111 or C2112 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 6 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 6 Check whether the DTC is reset Q Is DTC C2111 or C2112 set YES Return to Step 1 NO The procedure is complete DTC C2114 Abnormality in G and yaw rate sensor operation voltage DTC C2115 Abnormality in G and yaw rate sensor operation voltage Connector A 05 Connector C 38 _ ____ AC708948AB i Le AC708951AG A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e Do not drop the G and yaw rate sensor or subject it to a shock e When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e ASC ECU supplies power to the G and yaw rate sensor at the terminal No 1 e The G and yaw ra
121. S STEP 9 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1035 set YES Return to Step 1 NO This diagnosis is complete DTC C1041 Abnormality in periodical signal for FL wheel speed sensor A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed e The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed
122. S Go to Step 13 NO Go to Step 15 STEP 13 Connector check A 05 ASC ECU connector A 11 wheel speed sensor lt FL gt connector Q Is the check result normal YES Go to Step 14 NO Repair the defective connector Then go to Step 16 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 48 DIAGNOSIS STEP 14 Wiring harness check between A 05 ASC ECU connector terminal No 45 and A 11 wheel speed sensor lt FL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 46 and A 11 wheel speed sensor lt FL gt connector terminal No 2 e Open circuit check of wheel speed sensor lt FL gt circuit Q Is the check result normal YES Go to Step 15 NO Repair the wiring harness Then go to Step 16 STEP 15 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1011 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 16 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 16 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or
123. S This diagnostic trouble code is set if ASC ECU cannot receive the signal sent from the G and yaw rate sensor even when the voltage supplied to ASC ECU is normal TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 203 PROBABLE CAUSES e Wiring harness or connector failure in special CAN bus lines Local CAN between ASC ECU and G and yaw rate sen sor e Gand yaw rate sensor malfunction e ASC ECU malfunction e External noise interference DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 3 STEP 2 Check for diagnostic trouble codes of other systems Check if diagnostic trouble code No U0251 U0440 and U0435 are simultaneously set in ASC ECU Q Are DTCs U0251 U0440 or U0435 set YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 208 NO Goto Step 3 STEP 3 DTC recheck after repairing the CAN bus line Q Is DTC U0125 set YES Go to Step 4 NO This diagnosis is complete STEP 4 Connector check A 05 ASC
124. SC OFF switch is not OFF pressed 129 FL wheel cylinder The brake pedal is depressed Increases by the amount of pressure the brake pedal depression The brake pedal is released 3 to 3 bar 130 FR wheel cylinder The brake pedal is depressed Increases by the amount of pressure the brake pedal depression The brake pedal is released 3 to 3 bar 131 RL wheel cylinder The brake pedal is depressed Increases by the amount of pressure the brake pedal depression The brake pedal is released 3 to 3 bar 132 RR wheel cylinder The brake pedal is depressed Increases by the amount of pressure the brake pedal depression The brake pedal is released 3 to 3 bar 133 FL wheel cylinder pres Wheel cylinder fluid pressure 8 to 8 bar offset sensor correction amount 134 FR wheel cylinder pres offset 135 RL wheel cylinder pres offset 136 RR wheel cylinder pres offset 2 System shutdown by ECU While ASC ECU is disabled by the diagnostic function the scan tool displayed data is different from the actual measurement ACTUATOR TEST REFERENCE TABLE Using scan tool the following actuators can be forc ibly operated NOTE e ABS TCL and skid control are operated by ASC ECU e When ASC ECU is disabled due to the fail safe function the actuator test cannot be performed e The actuator test can be performed only when the vehicle is stationary M1355001600172 e While the actuator test is performed the ABS warning light fl
125. SENSOR CALIBRATION A CAUTION e Before performing the calibration check that the wheel cylinder brake fluid pressure sensor related diagnostic trouble code is not set e Always perform the calibration with the brake pedal released stoplight switch is turned off e After the operation below is completed perform the cal ibration to make ASC ECU to learn the neutral point of the wheel cylinder brake fluid pressure sensor 1 Troubleshooting for diagnostic trouble code No C123A 2 ASC ECU replacement 1 Park the vehicle on a level surface 2 Turn the ignition key to the ON position 3 Turn the ignition key to the LOCK OFF position A CAUTION Before connecting or disconnecting scan tool MB991958 always turn the ignition switch to the LOCK OFF position 4 Check that the ignition key is in the LOCK OFF position and then set scan tool MB991958 5 Turn the ignition switch to the ON position M1355024500013 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC ON VEHICLE SERVICE 35C 269 6 On the Menu select System selection 7 On the System selection select ABS ASC ASTC WSS in the system list and then click the OK button 8 Select Special function in the ABS ASC ASTC WSS field 9 In the Special function select Learn sensor neutral position 10 Among the selected items select Learn M C pressure sensor neutral position and then press the OK button 11 Wh
126. SIS Inspection Procedure 2 With the parking brake released the brake warning light remains illuminated ABS warning light is turned off Connector C 312 ETACS ECU AC708972AP ee ee AC708949AF Connector C 04 AC708950AR AC708951AN A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the commu nication circuit is normal CIRCUIT OPERATION When the parking brake switch is turned ON the combina tion meter terminal No 4 is grounded and then the brake warning light is illuminated When the brake fluid level drop is detected the brake fluid level switch is turned from ON to OFF ETACS ECU moni tors the brake fluid level switch and gives an instruction via the CAN bus line to the combination meter to illuminate the brake warning light PROBABLE CAUSES The brake pad thickness is at the limit value or less The brake fluid amount is at the LOWER level or lower Poor adjustment of the parking brake lever Damaged wiring harness and connectors Parking brake switch malfunction Brake fluid level switch malfunction Combination meter malfunction ETACS ECU malfunction TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 222 DIAGNOSIS DIAGNOSIS Required Special Tools e MB991958
127. STEP 14 Wiring harness check between the C 103 joint connector and the C 46 S AWC ECU connector 1 Disconnect the C 46 S AWC ECU connector 2 Disconnect the C 103 joint connector and measure at the wiring harness side 3 Check the continuity short to ground between terminal No 16 and the ground OK No continuity Q Is the check result normal YES Go to Step 15 NO Repair the wiring harness between C 103 joint connector terminal No 16 and C 46 S AWC ECU connector terminal No 12 Then replace fuse No 17 or fusible link No 34 STEP 15 Wiring harness check between the C 103 joint connector and the A 05 ASC ECU connector 1 Disconnect ASC ECU connector A 05 2 Disconnect the C 103 joint connector and measure at the wiring harness side 3 Check the continuity short to ground between terminal No 17 and the ground OK No continuity Q Is the check result normal YES Replace the fuse No 17 or the fusible link No 34 Then go to Step 20 NO Repair the wiring harness between C 103 joint connector terminal No 17 and A 05 ASC ECU connector terminal No 2 Then replace fuse No 17 or fusible link No 34 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 249 MB991997 A 05 ASC ECU harness connector i R dere ene se SNO D Check harness ASC ECU AC400817CN DIAGNOSIS STEP 16 Voltage measurement at A 05 ASC ECU c
128. STEP 5 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if diagnostic trouble code No U0121 is set by ETACS system Q Is the DTC set YES Diagnose the ETACS ECU Refer to GROUP 54A ETACS Troubleshooting P 54A 582 Then go to Step 7 NO Goto Step 6 STEP 6 Retest the system Q Does the ABS warning light turn ON and OFF normally YES Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 7 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 232 DIAGNOSIS STEP 7 Retest the system Q Does the ABS warning light turn ON and OFF normally YES The procedure is complete NO Return to Step 1 Inspection Procedure 6 The ASC warning display stays ON even after the engine is started A CAUTION e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 SYSTEM OPERATION ASC ECU sends the illumination request signal of ASC warn ing display to the combination meter through ETACS ECU via CAN communication TECHNICAL DESCRIPTION COMMENT In the
129. TC U1003 G and yaw rate sensor bus off Connector A 05 7 Connectors C 46 C 47 C AC708948AB AC708950AN AC708951AG TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 211 DIAGNOSIS A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e Do not drop the G and yaw rate sensor or subject it toa shock e When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 e When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION The G and yaw rate sensor outputs the signal to ASC ECU and S AWC ECU via the special CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is set when ASC ECU cannot receive the signal sent from the G and yaw rate sensor PROBABLE CAUSES e Wiring harness or connector failure in special CAN bus lines between ASC ECU and G and yaw rate sensor e Gand yaw rate sensor malfunctio
130. UP 26 Front Axle Hub Assembly P 26 9 STEP 16 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1047 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 17 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 17 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1047 set YES Return to Step 1 NO This diagnosis is complete TSB Revision 35C 104 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC C1048 RL wheel speed sensor control phase time exceeded Connector A 05 ee AC708948AB Connector C 45 AC708950AD Connector D 1 8 lt AC708955AE ZA CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure senso
131. VE SKID CONTROL SYSTEM ASC 35C 137 DIAGNOSIS DTC SET CONDITIONS This diagnostic trouble codes will be set under the cases below e The pressure sensor offset is outside the specified range Pressure is generated at all times e The estimated pressure sensor temperature is not normal PROBABLE CAUSES Damaged wiring harness and connectors Incorrect adjustment of brake pedal height Master cylinder malfunction Brake booster malfunction Incorrect installation position of stoplight switch Malfunction of the stoplight switch Brake drag Malfunction of the ASC ECU DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C2001 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Check for diagnostic trouble codes of other systems Check if the diagnostic trouble code No C121E is set in ASC ECU Q Is the check result normal YES Go to Step 4 NO Carry out the diagnosis for the
132. When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 SYSTEM OPERATION e ASC ECU sends the illumination request signal of ASC OFF display to the combination meter through ETACS ECU via CAN communication e By the operation of ASC OFF switch the ASC OFF display illuminates when the ASC function is stopped e When the ASC OFF switch is pressed shortly the ASC sys tem is turned OFF TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 235 TECHNICAL DESCRIPTION COMMENT In the case of this trouble symptom there may be a short circuit to the ASC OFF switch circuit PROBABLE CAUSES Damaged wiring harness and connectors ASC OFF switch malfunction ETACS ECU malfunction Combination meter malfunction ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 Then go to Step 9 STEP 2 S
133. agnostic trouble code No U0121 is set by ETACS system Q Is the DTC set YES Diagnose the ETACS ECU Refer to GROUP 54A ETACS Troubleshooting P 54A 591 Then go to Step 8 NO Goto Step 8 STEP 8 Retest the system Q Does the ASC OFF display turn ON and OFF normally YES Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 9 STEP 9 Retest the system Q Does the ASC OFF display turn ON and OFF normally YES The procedure is complete NO Return to Step 1 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 237 DIAGNOSIS Inspection Procedure 8 After the ASC OFF switch is pressed to turn OFF the skid control TCL cannot be cancelled Connector C 313 ETACS ECU ail Connector C 135 AC708972AQ AC708950AT AC708950 AU A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal SYSTEM OPERATION e The ETACS ECU terminal No 15 is grounded when the ASC OFF switch is pressed The ON OFF status of ASC OFF switch is sent from ETACS ECU to ASC ECU via CAN bus line e When the ASC OFF switch is pressed shortly the ASC sy
134. ally long time the wheel speed sensor signal may have a problem TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 99 PROBABLE CAUSES Damaged wiring harness and connectors External noise interference Malfunction of wheel speed sensor ABS ECU malfunction Excessive gap between the wheel speed sensor and the wheel speed detection encoder Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the wheel speed detection encoder Wheel bearing malfunction Improper installation of the wheel speed sensor Deformation of the wheel speed detection encoder Disturbance of magnetization pattern for wheel speed detection encoder e Missing teeth of the wheel speed detection encoder DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1047 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code
135. always diagnose the CAN bus lines If there is any fault in the CAN bus lines an incorrect DTC may be set e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the steering wheel sensor is replaced always perform calibration to make ASC ECU learn the neutral point Refer to P 35C 267 e When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 207 DIAGNOSIS CIRCUIT OPERATION The steering wheel sensor outputs the steering wheel status to ASC ECU via the CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is set when ASC ECU has detected the communication error in the steering wheel sensor PROBABLE CAUSES e Steering wheel sensor malfunction e ASC ECU malfunction e External noise interference DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the c
136. and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e ASC ECU supplies power to the G and yaw rate sensor at the terminal No 1 e The G and yaw rate sensor outputs the signal to ASC ECU via the special CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is set when an abnormality is detected by a comparison of the longitudinal G value output from G and yaw rate sensor with the wheel speed value output from wheel speed sensor PROBABLE CAUSES e Improper installation of the G and yaw rate sensor e Gand yaw rate sensor malfunction e Wheel speed sensor malfunction e ASC ECU malfunction e External noise interference NOTE This DTC may be set also when the vehicle is driven on the four wheel drum tester DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A TSB Revision A ACTIVE SKID CONTROL SYSTEM ASC 35C 170 DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 Check for diagnostic trouble codes of other systems Check if diagnostic trouble cod
137. ashes at a rate of 2 Hz e After the actuator test has been performed the brake warning light ABS warning light ASC ON indicator light and ASC OFF indicator light illumi TSB Revision nate until the ignition switch is turned to ON again or the communication between scan tool and ASC ECU is terminated xs ACTIVE SKID CONTROL SYSTEM ASC 35C 258 DIAGNOSIS Actuator test specifications Check item Driven component FL wheel ABS drive Solenoid valve for the corresponding FR wheel ABS drive channel of the hydraulic unit and pump RL wheel ABS drive motor simplified inspection mode RR wheel ABS drive FL wheel TCL drive FR wheel TCL drive RL wheel TCL drive RR wheel TCL drive Engine TCL drive Outputs the engine torque control signal engine torque 0 N m to the engine ECU for three seconds Operation pattern of items 01 to 08 Scan tool actuator test Item No 05 06 07 08 start Increase in pressure Cut valve End Suction valve Steady pressure TCL Skid control Reduction in pressure 1 Scan tool actuator test Item No 01 02 03 04 start End l Increase in pressure Solenoid valve ABS Steady pressure l l Pe l Reduction in pressure i 1 l l l Drive Pump motor l Stop i I l Approx 0 05 i Approx 0 01 seconds l 4seconds 2 seconds seconds rt AC400776AB TSB Revision
138. ation circuit Q Is the check result normal YES Go to Step 5 NO Repair the wiring harness and then go to Step 7 STEP 5 Check whether the DTC is reset Q Is DTC U1003 set YES Replace the G and yaw rate sensor Refer to P 35C 278 Then go to Step 6 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 6 Check whether the DTC is reset Q ls DTC U1003 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 7 NO The procedure is complete STEP 7 Check whether the DTC is reset Q Is DTC U1003 set YES Return to Step 1 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 213 DTC U1415 Variant coding not completed DIAGNOSIS A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When diagnostic trouble code No U1415 is set in ASC ECU the diagnostic trouble code may also be set in ETACS ECU When the diagnostic trouble code is set in ETACS ECU perform the diagnosis of the diagnostic trouble code for ETACS ECU first e When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registe
139. aulic unit detects the brake fluid pressure applied from the master cylinder At the same time it converts the pressure value into voltage signal and out puts the signal DTC SET CONDITIONS If the voltage supplied to the master cylinder pressure sensor is outside the standard value range these diagnostic trouble codes are set PROBABLE CAUSES ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C2111 or C2112 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Battery check Refer to GROUP 54A Battery Test P 54A 9 Q Is the battery in good condition YES Go to Step 4 NO Charge or replace the battery STEP 4 Charging system check Refer to GROUP 16 Charging System P 16 7 Q Is the charging system in good condition YES Go to Step 5 NO Repair or replace the charging system component s TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 178 DIAGNOSI
140. between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt FL gt for loose ness Refer to GROUP 26 On vehicle Service P 26 7 Q Is the check result normal YES Go to Step 4 NO Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 TSB Revision 35C 84 ACTIVE SKID CONTROL SYSTEM ASC Oil seal SL PS Magnetic encoder nae ins bearing AC704652 AB DIAGNOSIS STEP 4 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Goto Step 5 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 5 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1041 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 6 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 6 Check whether the
141. ble e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C123B set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code Check that DTCs C100A C1015 C1020 C102B C1011 C101C C1027 C1032 C1014 C101F C102A C1035 C1041 C1042 C1043 C1044 C1219 C2205 C123C and C2204 are also set Q Are DTCs C100A C1015 C1020 C102B C1011 C101C C1027 C1032 C1014 C101F C102A C1035 C1041 C1042 C1043 C1044 C1219 C2205 C123C and C2204 also set YES Carry out the diagnosis for the diagnostic trouble code that is set Refer to P 35C 20 Then go to Step 10 NO Go to Step 4 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 4 Check of G and yaw rate sensor installation status Check that the G and yaw rate sensor is installed correctly Q Is the check result normal YES After checking the G and yaw rate sensor perform the calibration of the G and yaw rate sensor to make ASC ECU relearn the neutral point Refer to P 35C 266 Then go to Step 5 NO Reinstall the G and yaw rate sensor correctly Re
142. bnormality in steering wheel sensor signal A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the steering wheel sensor is replaced always perform calibration to make ASC ECU learn the neutral point Refer to P 35C 267 e Do not drop the G and yaw rate sensor or subject it to a shock e When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 e When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Steering wheel sensor outputs the signal to ASC ECU via CAN bus lines TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 185 DTC SET CONDITIONS This diagnostic trouble code is set if any malfunction below is found e The tolerance of the neutral position of steering wheel sen sor exceeds the specified range e Abnormality in steering wheel sensor output value e Abnormality is detected by a comparison of ou
143. can tool MB991958 check if diagnostic trouble code No U0141 is set by the combination meter system Q Is the DTC set YES Diagnose the combination meter Refer to GROUP 54A Combination Meter Troubleshooting P 54A 45 Then go to Step 8 NO Goto Step 6 STEP 6 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if diagnostic trouble code No U0121 is set by ETACS system Q Is the DTC set YES Diagnose the ETACS ECU Refer to GROUP 54A ETACS Troubleshooting P 54A 591 Then go to Step 8 NO Go to Step 7 STEP 7 Retest the system Q Does the ABS warning light turn ON and OFF normally YES Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 8 STEP 8 Retest the system Q Does the ABS warning light turn ON and OFF normally YES The procedure is complete NO Return to Step 1 TSB Revision 35C 228 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Inspection Procedure 4 The brake warning light does not illuminate when ignition switch is turned to the ON position engine stopped A CAUTION e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake f
144. can tool diagnostic trouble code Using scan tool check the diagnostic trouble code for ASC sys tem Q Is any DTC set YES Carry out the diagnosis for the DTC Refer to P 35C 20 NO Goto Step 3 STEP 3 ASC OFF switch check Refer to P 35C 271 Q Is the check result normal YES Go to Step 4 NO Replace the ASC OFF switch Refer to P 35C 271 Then go to Step 9 STEP 4 Connector check C 313 ETACS ECU connector C 42 intermediate connector C 135 ASC OFF switch connector Q Is the check result normal YES Go to Step 5 NO Repair the defective connector TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 236 DIAGNOSIS STEP 5 Wiring harness check between C 313 ETACS ECU connector terminal No 15 and C 135 ASC OFF switch connector terminal No 1 e Short circuit check of power supply circuit Q Is the check result normal YES Go to Step 6 NO Repair the wiring harness between C 313 ETACS ECU connector terminal No 15 and C 119 ASC OFF switch connector terminal No 1 STEP 6 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if diagnostic trouble code No U0141 is set by the combination meter system Q Is the DTC set YES Diagnose the combination meter Refer to GROUP 54A Combination Meter Troubleshooting P 54A 45 Then go to Step 9 NO Go to Step 7 STEP 7 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if di
145. case of this trouble symptom there may be a malfunction to the CAN bus line ETACS ECU combination meter or ASC ECU PROBABLE CAUSES Damaged wiring harness and connectors Malfunction of ETACS ECU Combination meter malfunction ASC ECU malfunction Control stop due to the low voltage NOTE Due to the abnormality in the supply voltage the diagnostic trouble code may not be set even when the ASC warning display is illuminated DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 233 STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 Then go to Step 7 STEP 2 Scan tool diagnostic trouble code Using scan tool check the diagnostic trouble code for ASC sys tem Q Is any DTC set YES Carry out the diagnosis for the DTC Refer to P 35C 20 NO Goto Step 3 STEP 3 Check of ASC ECU power supply circuit Refer to P 35C 243 Q Is the check result normal YES Go to Step 4 NO Carry out the diagnosis of ASC ECU power supply circuit system Refer to P 35C 243 STEP 4 Scan tool diagnostic troub
146. ce V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1046 set YES Go to Step 3 NO This diagnosis is complete TSB Revision 35C 94 ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CB DIAGNOSIS STEP 3 Scan tool diagnostic trouble code Check whether DTC No C100A C1011 C1014 and C1041 are simultaneously set Q Are DTC C100A C1011 C1014 and C1041 also set YES Carry out the diagnosis for the diagnostic trouble codes that are set and then go to Step 5 NO Go to Step 4 STEP 4 Scan tool service data Check the following service data Refer to P 35C 255 e Item No 01 FL wheel speed sensor Q Is the check result normal YES Go to Step 16 NO Goto Step 5 STEP 5 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connect
147. ced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION The pressure sensor is incorporated in the hydraulic unit When the brake pedal is depressed the pressure sensor detects the brake pressure applied from the master cylinder converts this pressure into the voltage signal and then outputs the signal DTC SET CONDITIONS This diagnostic trouble codes will be set under the cases below e The pressure sensor offset is outside the specified range Pressure is generated at all times e The estimated pressure sensor temperature is not normal PROBABLE CAUSES e Incorrect adjustment of brake pedal height e Master cylinder malfunction e Brake booster malfunction e Incorrect installation position of stoplight switch e Malfunction of the stoplight switch e Brake drag e Malfunction of the ASC ECU DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 133 STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step
148. ch wheel speed sensor while the vehicle is being driven If any abnormality below is detected in the sensor signals ASC ECU sets the relevant diagnostic trouble code Missing wheel speed sensor signal Wheel speed sensor signal continuously indicates lower value than the values of other wheel speed sensors PROBABLE CAUSES Cu rrent trouble Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection e Wheel bearing malfunction e Deformation of the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the magnetic encoder for wheel speed detection Malfunction of wheel speed sensor Improper installation of the wheel speed sensor ASC ECU malfunction Disturbance of magnetization pattern for magnetic encoder for wheel speed detection The number of poles on the magnetic encoder for wheel speed detection the number of N pole and S pole is changed Past trouble When the DTC No C100A is also set perform the diagno sis with a particular emphasis on the wiring harness and connector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshoot ing Inspection Service Points P 00 16 When DTC No C100A is not set simultaneously the follow ings can be suspected Wheel s spinning Unstable vehicle attitude spin Ex
149. contains the power supply circuit terminal No 32 for the solenoid valve The solenoid valve is energized by the valve relay which is incorporated in ASC ECU ASC ECU contains the power supply circuit terminal No 2 for ASC ECU and the power is supplied from the fusible link No 34 through the multi purpose fuse No 17 The valve relay in ASC ECU is energized at all times and the solenoid valve is always energized while the system is in operation unless the initial check is in progress when the ignition switch is turned ON or unless the periodical system check is in progress DTC SET CONDITIONS This diagnostic trouble code is set when the ASC ECU power supply voltage and solenoid valve power supply voltage become 18 0 1 0 V or higher PROBABLE CAUSES Battery failure Battery terminal looseness Fusible link malfunction Damaged wiring harness and connectors ASC ECU malfunction Charging system failed DIAGNOSIS Required Special Tools MB991958 Scan Tool M U T IIl Sub Assembly e MB991824 Vehicle Communication Interface V C I e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A MB991997 ASC check harness TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 152 DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to
150. ct wrench e Do not drop or shock the G and yaw rate sensor e When the G and yaw rate sensor is replaced always carry out calibration to make ASC ECU learn the neutral point Refer to P 35C 266 Pre removal and post installation steps Floor console side cover removal and installation Refer to GROUP 52A Floor Console Assembly P 52A 9 5 0 1 0N m 44 9 in lb 89 17 in lb 4 3 5 AC613540AB Removal steps Removal steps Continued 1 Front O sensor connector 3 Gand yaw rate sensor and G and 2 Gand yaw rate sensor connector yaw rate sensor bracket 4 Gand yaw rate sensor 5 Gand yaw rate sensor bracket TSB Revision ACTIVE SKID CONTROL SYSTEM ASC E STEERING WHEEL SENSOR 35C 279 STEERING WHEEL SENSOR REMOVAL AND INSTALLATION A CAUTION e Always align the center of the clock spring before installing the steering wheel sensor Otherwise the sensor can be damaged M1355005100221 e If the center of the clock spring is not correctly aligned the steering wheel may not be turned fully or the cable inside the clock spring may be broken causing the SRS air bag to be inoperative or operated incorrectly e Before removing the steering wheel assembly and driver s air bag module always refer to GROUP 52B Service Precautions P 52B 25 and Driver s Air bag Module and Clock Spring P 52B 386 e When the steering wheel sensor is replaced always carry out calibrati
151. d ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Brake ABS warning ASC warning ASC OFF light warning light brake warning display light ABS warning display display Abnormality in FL wheel inlet valve system Abnormality in FR wheel inlet valve system Abnormality in RL wheel inlet valve system Abnormality in RR wheel inlet valve system Abnormality in FL wheel outlet valve system Abnormality in FR wheel outlet valve system Abnormality in RL wheel outlet valve system Abnormality in RR wheel outlet valve system Abnormality in FL RR wheel cut valve system Abnormality in FR RL wheel cut valve system Abnormality in FL RR wheel suction valve system Abnormality in FR RL wheel suction valve system Faulty valve power supply circuit Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Faulty motor drive circuit Extinguished Illuminated 2 Illuminated Illuminated Abnormality in power supply voltage in pump motor Extinguished Illuminated 2 Illuminated Illuminated Abnormality in brake fluid pressure sensor circuit Extinguished Illuminated Illuminated Illuminated Abnormality in brake fluid pressure sensor output signal Extinguished Illuminated Illuminated Illuminated
152. d Connectors A 03 A 05 ee AC708948AC A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed DTC SET CONDITIONS This diagnostic trouble code is set if any malfunction below is detected When the brake fluid pressure is decreased for a long time When the brake fluid pressure is held for a long time NOTE ABS controls the vehicle based on the wheel speed sig nal When the brake fluid pressure is decreased or held for an abnorm
153. d DTC SET CONDITIONS ASC ECU monitors the signals from each wheel speed sensor while the vehicle is being driven If any abnormality below is detected in the sensor signals ASC ECU sets the relevant diagnostic trouble code e Irregular change in the wheel speed sensor signal e Wheel speed sensor signal continuously indicates higher value than the values of other wheel speed sensors TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 44 DIAGNOSIS PROBABLE CAUSES Current trouble e Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the magnetic encoder for wheel speed detection Wheel bearing malfunction Malfunction of wheel speed sensor Damaged wiring harness and connectors External noise interference Improper installation of the wheel speed sensor Deformation of the magnetic encoder for wheel speed detection e ASC ECU malfunction e Disturbance of magnetization pattern for magnetic encoder for wheel speed detection e The number of poles on the magnetic encoder for wheel speed detection the number of N pole and S pole is changed Past trouble e When the DTC No C100A is also set perform the diagno sis with a particular emphasis on the wiring harness and connector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Troubl
154. d sensor lt FL gt connector terminal No 2 e Open circuit check of wheel speed sensor lt FL gt circuit Q Is the check result normal YES Go to Step 11 NO Repair the wiring harness Then go to Step 17 STEP 11 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 13 NO Replace the wheel speed sensor lt FL gt Refer to P 35C 274 Then go to Step 17 STEP 12 Connector check A 05 ASC ECU connector A 11 wheel speed sensor lt FL gt connector Q Is the check result normal YES Go to Step 16 NO Repair the defective connector Then go to Step 17 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 97 Oil seal I Ps Magnetic encoder real ice bearing AC704652 AB DIAGNOSIS STEP 13 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt FL gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 14 NO Reinstall the wheel speed sensor lt FL gt correctly Refer to P 35C 274 Then go to Step 17 STEP 14 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt FL gt for loose ness Refer to GROUP 26 On vehicle Service P 26 7 Q Is the ch
155. d to the ON position engine stopped A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 SYSTEM OPERATION e ASC ECU sends the illumination signal of ABS warning light to the combination meter through ETACS ECU via CAN communication e When the ignition switch is turned ON ASC ECU illumi nates the ABS warning light via ETACS ECU for approxi mately 3 seconds for the purpose of bulb check TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 226 DIAGNOSIS TECHNICAL DESCRIPTION COMMENT In the case of this trouble symptom there may be a malfunction to the CAN bus line ETACS ECU combination meter or ASC ECU PROBABLE CAUSES Damaged harness wires and connectors Malfunction of the ETACS ECU Malfunction of the combination meter Malfunction of ASC ECU Abnormality with ETACS ECU coding data DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable
156. driven If any abnormality below is detected in the sensor signals ASC ECU sets the relevant diagnostic trouble code e Irregular change in the wheel speed sensor signal e Wheel speed sensor signal continuously indicates higher value than the values of other wheel speed sensors TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 50 DIAGNOSIS PROBABLE CAUSES Current trouble e Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the magnetic encoder for wheel speed detection Wheel bearing malfunction Malfunction of wheel speed sensor Damaged wiring harness and connectors External noise interference Improper installation of the wheel speed sensor Deformation of the magnetic encoder for wheel speed detection ASC ECU malfunction e Disturbance of magnetization pattern for magnetic encoder for wheel speed detection e The number of poles on the magnetic encoder for wheel speed detection the number of N pole and S pole is changed Past trouble e When the DTC No C1015 is also set perform the diagnosis with a particular emphasis on the wiring harness and con nector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshoot ing Inspection Service Points P 00 16 e When diagnostic trouble code No C101
157. e GROUP 00 How to Use Troubleshoot ing Inspection Service Points P 00 16 e When the diagnostic trouble code No C100A is not set the following conditions may be present e Wheel s spinning e Unstable vehicle attitude spin e External noise interference e Vehicle ran with the parking brake applied DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 45 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1011 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code Check if DTC No C100A is also set Q Is DTC C100A also set YES Carry out the diagnosis for code No C100A Refer to P 35C 23 NO Go to Step 4 STEP 4 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt FL gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is
158. e LH oon WN TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 350 274 WHEEL SPEED SENSOR WHEEL SPEED SENSOR REMOVAL AND INSTALLATION A CAUTION The vehicle speed detection encoder collects any metallic particle easily because it is magnetized Make sure that the encoder should not collect any metallic particle Check that there is not any trou ble prior to reassembling it M1355005300162 lt Front gt 1 a 13 2N m 2 111 22 in Ib a 1 7 11 2Nm 98 17 in Ib o p 2 8 5 1 5 N m 76 13 in Ib TLEAN M 4 98 17 in lb oe Res 3 a 13 2 N m 8 5 1 5N m 111 22 in lb ae 76 13 in Ib 5 lt Rear gt Dn j TTEA Nm S 8 5 1 5 N m 76 13 in Ib 6_ Ke YO 8 5 1 5N m SLA 76 13 in Ib PF 98 17 in lb 7 8 ne SS L i 8 5 1 5 N m 76 13 in Ib 11 2 N m 98 17 in Ib ak 8 5 1 5N m 76 13 in Ib AC704283AB TSB Revision gt gt C lt lt gt gt A lt lt gt gt B lt lt Body panel X Body panel 7 sensor grommet ACTIVE SKID CONTROL SYSTEM ASC WHEEL SPEED SENSOR Front wheel speed sensor removal steps 1 Front wheel speed sensor connector 2 Front wheel speed sensor grommet 3 Bolt front wheel speed sensor and knuckle connection Sensor harness clip Front wheel speed sensor One gt gt A lt lt 9 35C 275 Rear wheel speed sensor removal steps Trunk room front trim Refer to G
159. e DTC Refer to P 35C 20 e f you cannot get the same ASC DTC to set again the malfunction is intermittent Refer to GROUP 00 How to use Troubleshooting Inspec tion Service Points How to Cope with Intermit tent Malfunctions P 00 15 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C T PRECAUTIONS FOR DIAGNOSIS M1355009500113 1 ASC controls the brake pressure by the assistance of ECU The symptoms described in the table below may occur during the normal ASC operation However they do not indicate any sign of malfunction Symptoms Description of symptoms e When ASC operates the operating noise is generated from These noises are generated when the the motor integrated in the hydraulic unit Screech system and brake pedal operate e Noise is generated from the brake pedal together with the normally and they do not indicate any vibration Boom boom sign of malfunction e When ASC operates the system repeats the activation and deactivation At this time the noise is generated from the chassis components Clunk Suspension Squeak Tire e A slight shock is felt occasionally when the brake pedal is This noise is generated when the system depressed lightly during the low speed driving operation check lt startup check e Small clicking noise is heard occasionally from the engine performed when the vehicle speed is at compartment few km h mile gt is performed and it does not i
160. e DTC C104B C104F C1053 C1057 C105F C1063 C1067 C105B C1200 C1204 C1208 or C120C set YES Go to Step 3 NO This diagnosis is complete STEP 3 Check whether the DTC is reset Q Are DTC C104B C104F C1053 C1057 C105F C1063 C1067 C105B C1200 C1204 C1208 or C120C set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 4 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 4 Check whether the DTC is reset Q Are DTC C104B C104F C1053 C1057 C105F C1063 C1067 C105B C1200 C1204 C1208 or C120C set YES Return to Step 1 NO This diagnosis is complete TSB Revision 35C 118 ACTIVE SKID CONTROL SYSTEM ASC DTC C2104 Faulty valve power supply circuit Connector A 05 7 ee AC708948AB DIAGNOSIS A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU contains the power supply circuit terminal No 32
161. e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus line Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 Then go to Step 8 STEP 2 Scan tool diagnostic trouble code Using scan tool check the diagnostic trouble code for ASC sys tem Q Is the DTC set YES Carry out the diagnosis for the diagnostic trouble code Refer to P 35C 20 NO Goto Step 3 STEP 3 M U T IIl actuator test Perform the following actuator tests from the combination meter system to check if the ABS warning light is illuminated Refer to GROUP 54A Combination Meter Actuator Test Table P 54A 82 e Item 07 Indicator Q Is the check result normal YES Go to Step 4 NO Carry out the diagnosis of the combination meter Refer to GROUP 54A Combination Meter Trouble Symptom Chart P 54A 59 Then go to Step 8 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 227 DIAGNOSIS STEP 4 Coding data check Using the scan tool check if there is any abnormality to the coding data stored in the ETACS ECU Refer to GROUP 00 Coding Table P 00 39 Q Is the check result normal YES Go to Step 5 NO Replace the ETACS ECU Refer to GROUP 54A ETACS ECU P 54A 676 Then go to Step 8 STEP 5 Scan tool diagnostic trouble code for other systems Using s
162. e No U0125 is also set in ASC ECU Q Is DTC U0125 set YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 202 Then go to Step 3 NO Goto Step 3 STEP 3 Check whether the DTC is reset Q Is DTC C1242 set YES Go to Step 4 NO This diagnosis is complete STEP 4 Check of wheel speed sensor related diagnostic trouble code Using scan tool MB991958 check if the wheel speed sen sor related diagnostic trouble code is set Refer to P 35C 20 Q Is any DTC set YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 20 NO Goto Step 5 STEP 5 G and yaw rate sensor check Check that the G and yaw rate sensor is installed correctly Q Is the check result normal YES After checking the G and yaw rate sensor perform the calibration of the G and yaw rate sensor to make ASC ECU relearn the neutral point Refer to P 35C 266 Then go to Step 6 NO Reinstall the G and yaw rate sensor correctly Refer to P 35C 278 Then go to Step 8 STEP 6 Scan tool service data Check the following service data Refer to P 35C 255 e Item 09 G sensor Q Is the check result normal YES Go to Step 7 NO Replace the G and yaw rate sensor Refer to P 35C 278 Then go to Step 7 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 171 DIAGNOSIS STEP 7 Check whether the DTC is reset Q Is DTC C1242 set YES Replace the hydraulic un
163. e code No C2002 is performed 2 ASC ECU replacement 1 Park the vehicle on a level surface 2 Turn the ignition key to the ON position 3 Turn the ignition key to the LOCK OFF position TSB Revision 35C 270 ACTIVE SKID CONTROL SYSTEM ASC ON VEHICLE SERVICE A CAUTION Before connecting or disconnecting scan tool always turn the ignition switch to the LOCK OFF position 4 Check that the ignition key is in the LOCK OFF position and then set scan tool 5 Turn the ignition switch to the ON position 6 On the Menu select System selection 7 On the System selection select ABS ASC ASTC WSS in the system list and then click the OK button 8 Select Special function in the ABS ASC ASTC WSS field 9 In the Special function select Learn valve fluid pressure 10 Among the selected items select Cut valve fluid pressure and then press the OK button 11 When a message Cut valve fluid pressure Are you sure to execute the selected item Caution Check the execution conditions is displayed press the OK button 12 When a message Command execution Command has been executed is displayed press the OK button 13 Check that the message changes from Under execution to Complete NOTE The cut valve fluid pressure learning requires approximately 20 seconds 14 Among the selected items select Inlet valve fluid pressure and then press the OK button
164. e connector Q Is the check result normal YES Go to Step 10 NO Repair the defective connector Then replace fuse No 2 STEP 10 Wiring harness check between C 48 stoplight switch connector and C 312 ETACS ECU connector and C 43 joint connector 1 Disconnect C 43 joint connector C 48 stoplight switch connector and C 312 ETACS ECU connector 2 Check the continuity short to ground between C 48 stoplight switch connector terminal No 1 and the ground OK No continuity Q Is the check result normal YES Go to Step 11 NO The short circuit may be present in the wiring harness between C 48 stoplight switch connector terminal No 1 and C 43 joint connector terminal No 2 or between C 48 stoplight switch connector terminal No 1 and C 312 ETACS ECU connector terminal No 16 Repair the damaged wiring harness Then replace fuse No 2 STEP 11 Harness check between C 48 stoplight switch connector and C 304 ETACS ECU connector 1 Disconnect C 48 stoplight switch connector and C 304 ETACS ECU connector 2 Check the continuity short to ground between C 48 stoplight switch connector terminal No 2 and the ground OK No continuity Q Is the check result normal YES Go to Step 12 NO The short circuit may be present in the wiring harness between C 48 stoplight switch connector terminal No 2 and C 304 ETACS ECU connector terminal No 1 Then replace fuse No 2 TSB Revision 2 ACTIVE SKID C
165. e connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 36 and the body ground as well as between the ground terminal No 37 and the body ground OK 1 volt or less Check harness Q Is the check result normal YES Goto Step 9 MB991997 ASC ECU NO as normal at the terminal No 36 or 37 Go to Step A 05 ASC ECU harness connector AC400817CH TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 59 Check harness MB991 Ne ASC ECU A 05 ASC ECU harness connector AC400817CI DIAGNOSIS STEP 9 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 36 and the body ground as well as between the ground terminal No 37 and the body ground OK No continuity Q Is the check result normal YES Go to Step 12 NO Not normal at the terminal No 36 or 37 Go to Step 10 STEP 10 Connector check A 05 ASC ECU connector C 45 inter
166. e signals to determine the wheel speed DTC SET CONDITIONS ASC ECU monitors the signals from each wheel speed sensor while the vehicle is being driven If any periodical drop abnor mality is detected in the sensor signals ASC ECU sets the rel evant diagnostic trouble code TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 88 DIAGNOSIS PROBABLE CAUSES e Wheel bearing malfunction e Deformation of the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the magnetic encoder for wheel speed detection e ABS ECU malfunction e Disturbance of magnetization pattern for magnetic encoder for wheel speed detection e Missing teeth of the magnetic encoder for wheel speed detection DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1043 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Wheel bearing looseness check NOTE Wheel b
167. earing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt RL gt for loose ness Refer to GROUP 27 On vehicle Service P 27 33 Q Is the check result normal YES Go to Step 4 NO Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 89 Rear Wheel bearing Rear wheel hub bl Magnetic ibe encoder AC608248AB DIAGNOSIS STEP 4 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Goto Step 5 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 5 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1043 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 6 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malf
168. easurement at C 04 combination meter connector 1 Release the parking brake lever not operated 2 Turn the ignition switch to the ON position 3 Without disconnecting the connector measure the voltage between the terminal No 4 and the body ground by backprobing OK System voltage Q Is the check result normal YES Go to Step 17 NO Goto Step 16 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 225 DIAGNOSIS STEP 16 Wiring harness check Between C 04 combination meter connector and C 122 parking brake switch connector Check for a short circuit in the wiring harness between C 04 combination meter connector terminal No 4 and C 122 parking brake switch connector terminal No 1 Q Is the check result normal YES Go to Step 17 NO Repair the wiring harness STEP 17 Retest the system Q Does the brake warning light turn ON and OFF normally according to the parking brake lever operation YES Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 NO Replace the combination meter assembly Refer to GROUP 54A Combination Meter P 54A 101 Then go to Step 18 STEP 18 Retest the system Q Does the brake warning light turn ON and OFF normally according to the parking brake lever operation YES The procedure is complete NO Return to Step 1 Inspection Procedure 3 The ABS warning light does not illuminate when ignition switch is turne
169. eck result normal YES Go to Step 15 NO Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 15 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Go to Step 16 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 16 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1046 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 17 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 17 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1046 set YES Return to Step 1 NO This diagnosis is complete TSB Revision 35C 98 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC C1047 FR wheel speed sensor control phase time exceede
170. eck that the steering wheel sensor is installed correctly Q Is the check result normal YES Go to Step 8 NO Install the steering wheel sensor correctly Refer to P 35C 279 Then go to Step 8 STEP 8 Wheel alignment check Refer to P 33 7 Q Is the check result normal YES After checking the wheel alignment perform the calibration of steering wheel sensor to make ASC ECU relearn the neutral point Refer to P 35C 267 Then go to Step 9 NO After adjusting the wheel alignment perform the calibration of steering wheel sensor to make ASC ECU relearn the neutral point Refer to P 35C 267 Then go to Step 9 TSB Revision 35C 174 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 9 Scan tool service data Check the following service data Refer to P 35C 255 e Item 11 Steering angle sensor Q Is the check result normal YES Go to Step 10 NO Replace the steering wheel sensor Refer to P 35C 279 Then go to Step 10 STEP 10 Check whether the DTC is reset Q Is DTC C123C set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 11 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 11 Check whether the DTC is reset Q Is DTC C123C set YES Return to Step 1 NO The procedure is complete DTC C2204 Internal abnormality in G and yaw rate sensor A CAUTION e If there is any prob
171. ed sensor harness hydraulic unit bracket connector connection lt lt B gt gt 7 Hydraulic unit ASC ECU 3 Wheel speed sensor harness clip 8 Hydraulic unit bracket insulator connection 9 Hydraulic unit bracket B gt gt A lt lt 4 Brake tube connection 10 Suction pipe liquid pipe and clip 5 Brake tube clip and body connection connection 11 Hydraulic unit bracket A TSB Revision ACTIVE SKID CONTROL SYSTEM ASC l HYDRAULIC UNIT 35C 273 REMOVAL SERVICE POINTS lt lt A gt gt ASC ECU WIRING HARNESS CONNEC TOR DISCONNECTION Operate the lock lever as shown in the figure to disconnect the ASC ECU wiring harness connector lt lt B gt gt HYDRAULIC UNIT ASC ECU REMOVAL A CAUTION e Be careful when removing the hydraulic unit because it is heavy e Never loosen the nuts and the bolts because the hydraulic unit cannot be disassembled e Do not drop or shock the hydraulic unit e Do not turn the hydraulic unit upside down or lay down the unit because the inner air becomes difficult to be bled INSTALLATION SERVICE POINT gt gt A lt lt BRAKE TUBE CONNECTION Install the brake pipe to the hydraulic unit as shown in the fig ure 1 From master cylinder primary To front brake RH To front brake LH From master cylinder Secondary To rear brake RH To rear brak
172. ehicle or turn the engine off and restart it To set the proper conditions for that DTC again refer to ASC DTC SET CONDITIONS for each ASC DTC that you are trying to reset ASC DIAGNOSTIC TROUBLESHOOTING STRATEGY Use these steps to plan your diagnostic strategy If you follow them carefully you will be sure that you have exhausted most of the possible ways to find an ASC fault 1 Gather information about the problem from the customer 2 Verify that the condition described by the customer exists 3 Check the vehicle for any ASC DTC 4 If you cannot verify the condition and there are no ASC DTCs the malfunction is intermittent Refer to GROUP 00 How to use Troubleshooting Inspection Service Points How to Cope with Intermittent Malfunctions P 00 15 5 If you can verify the condition but there are no ASC DTCs or the system cannot communicate with the scan tool check that the basic brake system is operating properly M1355000900147 e If the basic brake system is not operating prop erly refer to the GROUP 35A Basic Brake Sys tem Diagnostic troubleshooting strategy P 35A 4 e If the basic brake system is operating properly refer to P 35C 219 6 If there is an ASC DTC record the number of the DTC then erase the DTC from the memory using the scan tool 7 Recreate the ASC DTC set conditions to see if the same ASC DTC will set again e If the same ASC DTC sets again perform the diagnostic procedures for th
173. el hub bl Magnetic ibe encoder AC608248AB DIAGNOSIS STEP 7 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Goto Step 8 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 8 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C102A set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 9 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 9 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C102A set YES Return to Step 1 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 79 DIAGNOSIS DTC C1035 Mutual monitoring of RR wheel speed
174. el speed sensor P 35C 68 Mutual monitoring of FR wheel speed sensor P 35C 72 Mutual monitoring of RL wheel speed sensor P 35C 75 Mutual monitoring of RR wheel speed sensor P 35C 79 Abnormality in periodical signal for FL wheel speed sensor P 35C 82 Abnormality in periodical signal for FR wheel speed sensor P 35C 85 Abnormality in periodical signal for RL wheel speed sensor P 35C 87 Abnormality in periodical signal for RR wheel speed sensor FL wheel speed sensor control phase time exceeded P 35C 90 P 35C 92 FR wheel speed sensor control phase time exceeded RL wheel speed sensor control phase time exceeded P 35C 98 P 35C 104 RR wheel speed sensor control phase time exceeded P 35C 110 Abnormality in FL wheel inlet valve system Abnormality in FR wheel inlet valve system Abnormality in RL wheel inlet valve system Abnormality in RR wheel inlet valve system Abnormality in FL wheel outlet valve system Abnormality in FR wheel outlet valve system Abnormality in RL wheel outlet valve system Abnormality in RR wheel outlet valve system Abnormality in FL RR wheel cut valve system Abnormality in FR RL wheel cut valve system Abnormality in FL RR wheel suction valve system Abnormality in FR RL wheel suction valve system P 35C 116 Faulty valve power supply circuit P 35C 118 Faulty motor drive circuit TSB Revision
175. el speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed DTC SET CONDITIONS ASC ECU monitors the electric current in each wheel speed sensor circuit If an open or short circuit in the wheel speed sensor circuit is detected ASC ECU sets a corresponding diagnostic trouble code PROBABLE CAUSES Current trouble Damaged wiring harness and connectors Noise interference Malfunction of wheel speed sensor ASC ECU malfunction TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 29 Past trouble e Carry out the diagnosis with a particular emphasis on the wiring harness and connector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshooting Inspection Service Points P 00 16 DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines
176. ems Q Is DTC U1417 set YES Perform the troubleshooting for diagnostic trouble code No U1417 Refer to P 35C 215 NO Go to Step 4 STEP 4 Check whether the DTC is reset 1 Ignition switch LOCK OFF 2 Ignition switch ON 3 Check that the ABS warning light is extinguished Q Is DTC U1415 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 5 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 5 Check whether the DTC is reset 1 Ignition switch LOCK OFF 2 Ignition switch ON 3 Check that the ABS warning light is extinguished Q Is DTC U1415 set YES Return to Step 1 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 215 DIAGNOSIS DTC U1417 Variant coding value invalid includes faulty installation A CAUTION e If diagnostic trouble code No U1417 is set in ASC ECU always diagnose the CAN bus lines If there is any fault in the CAN bus lines an incorrect DTC may be set e Whenever the ECU is replaced ensure that the commu nication circuit is normal e When diagnostic trouble code No U1417 is set in ASC ECU the diagnostic trouble code may also be set in ETACS ECU When the diagnostic trouble code is set in ETACS ECU perform the diagnosis of the diagnostic trouble code for ETACS ECU first e When the hydraulic unit integrated wi
177. en A 05 ASC ECU connector terminal No 43 and D 09 wheel speed sensor lt RR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 42 and D 09 wheel speed sensor lt RR gt connector terminal No 2 e Open circuit check of wheel speed sensor lt RR gt circuit Q Is the check result normal YES Go to Step 10 NO Repair the wiring harness Then go to Step 13 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 42 DIAGNOSIS STEP 10 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 11 NO Replace the wheel speed sensor lt RR gt Refer to P 35C 274 Then go to Step 13 STEP 11 Connector check A 05 ASC ECU connector C 47 intermediate connector D 09 wheel speed sensor lt RR gt connector Q Is the check result normal YES Go to Step 12 NO Repair the defective connector Then go to Step 13 STEP 12 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C102B set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 13 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 13 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning l
178. en a message Learn M C pressure sensor neutral position Are you sure to execute the selected item Caution Check the execution conditions is displayed press the OK button 12 When a message Command execution Command has been executed is displayed press the OK button 13 The neutral point is learned 14 Turn the ignition key to the LOCK OFF position and then remove the scan tool from the vehicle CALIBRATION OF CUT VALVE AND INLET VALVE M1355024700017 A CAUTION e Before the calibration work of the cut valve and inlet valve check that no diagnostic trouble code is set relating to the cut valve inlet valve motor system power supply system or ECU system Always perform the calibration of cut valve and inlet valve with the brake pedal released stoplight switch is turned off If any diagnostic trouble code other than No C2002 is also set always perform the diagnosis of the diagnos tic trouble code other than No C2002 first After the replacement of ASC ECU the calibration of cut valve and inlet valve must be performed with the new ASC ECU When the cut valve calibration is performed the cali bration of master cylinder fluid pressure sensor is also executed at the same time When the cut valve calibration is not completed the inlet valve calibration cannot be performed After the completion of following works always per form the calibration of cut valve and inlet valve 1 Diagnosis for the diagnostic troubl
179. en go to Step 9 STEP 6 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt RR gt for loose ness Refer to GROUP 27 On vehicle Service P 27 33 Q Is the check result normal YES Go to Step 7 NO Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 7 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Goto Step 8 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 8 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1035 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 9 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 82 DIAGNOSI
180. en should not be used for this f MB991825 key ASC check Diagnostic trouble g MB991826 code display service data display M U T III sub and calibration by scan tool M1355005800101 assembly a Vehicle communication interface V C I M U T II USB cable M U T II main harness A Vehicles with CAN communication system M U T III main harness B Vehicles without CAN communication system M U T III main harness C for Daimler Chrysler models only M U T III measurement adapter M U T III trigger harness MB991826 MB991958 MB991997 ASC check harness _ Voltage inspection at ASC ECU terminals MB991997 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC name Tool number and 35C 263 ON VEHICLE SERVICE Supersession Application MB991223 a MB991219 b MB991220 c MB991221 d MB991222 Harness set a Test harness b LED harness c LED harness adaptor d Probe oe ed Ak DO NOT USE MB991223 MB992006 Extra fine probe MB992006 General service tools Continuity check and voltage measurement at harness wire or connector for loose corroded or damaged terminals or terminals pushed back in the connector a Connector pin contact pressure inspection b Power circuit inspection c Power circuit inspection d Commercial tester connection Continuity check and voltage measurement at harness wire
181. en the wheel speed sensor circuit power supply terminal signal terminal No 45 and the body ground OK System voltage Q Is the check result normal Check harness YES Go to Step 9 NO Goto Step 11 MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CD STEP 9 Wiring harness check between A 05 ASC ECU connector terminal No 45 and A 11 wheel speed sensor lt FL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 46 and A 11 wheel speed sensor lt FL gt connector terminal No 2 e Open circuit check of wheel speed sensor lt FL gt circuit Q Is the check result normal YES Go to Step 10 NO Repair the wiring harness Then go to Step 13 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 27 DIAGNOSIS STEP 10 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 11 NO Replace the wheel speed sensor lt FL gt Refer to P 35C 274 Then go to Step 13 STEP 11 Connector check A 05 ASC ECU connector A 11 wheel speed sensor lt FL gt connector Q Is the check result normal YES Go to Step 12 NO Repair the defective connector Then go to Step 13 STEP 12 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C100A set YES
182. ensor malfunction or pump motor malfunction is stored in ASC ECU as a past trouble ASC ECU keeps the ABS Brake warning light F oo N NE Approximately 3s warning light illuminated until it can verify at startup check ABS warning Illuminate that the malfunction for that code is resolved Ge e 2 The brake warning light does not turn off when the park liah on ing brake is applied or the brake fluid level is low ght START Ignition ON m switch ACC LOCK AC610579AB DIAGNOSTIC FUNCTION M1355001000147 ASC ECU has the following functions for easier sys e Diagnostic trouble code set Refer to P 35C 20 tem checks All the following items can be diagnosed e Service data output Refer to P 35C 255 using the scan tool e Actuator test Refer to P 35C 257 FAIL SAFE FUNCTIONS When a malfunction is determined by the diagnostic NOTE The brake warning light and brake warning function ASC ECU illuminates the ABS warning display are used as the EBD control warning light light ABS warning display brake warning display brake warning light ASC warning display and ASC OFF display At the same time ASC ECU prohibits the ABS EBD skid control and TCL control TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Brake warning light brake warning display ABS warning light ABS warning display Illumination condition of warning light and display in case of failure ASC warning
183. ep 16 STEP 5 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 6 NO Replace the wheel speed sensor lt RL gt Refer to P 35C 274 Then go to Step 16 STEP 6 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt RL gt for loose ness Refer to GROUP 27 On vehicle Service P 27 33 Q Is the check result normal YES Go to Step 7 NO Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 58 DIAGNOSIS STEP 7 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Rear Wheel bearing Q Is the check result normal Rear wheel YES Go to Step 8 nub bl Magnetic NO Adhesion of foreign materials Clean the encoder een encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the rear wheel hub assembly AC608248AB Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 8 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness sid
184. epair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC U1417 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Check for diagnostic trouble codes of other systems Check if diagnostic trouble code No C121C is set in ASC ECU Q Is the check result normal YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 157 NO Go to Step 4 STEP 4 Scan tool diagnostic trouble code for other systems Using scan tool check if the ETACS ECU related or engine control module related diagnostic trouble code is set Q Is any DTC set YES Perform troubleshooting for the diagnostic trouble code that is set NO Goto Step 5 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 217 DIAGNOSIS STEP 5 ETACS ECU coding data check Using the scan tool check if there is any abnormality to the fol lowing coding data stored in the ETACS ECU Refer to GROUP 00 Coding Table P 00 39 Vehicle line OK LANCER EVO Transaxle OK Vehicles without TC SST 5MT OK Vehicles with TC SST TC SST Engine type OK D4 V V T 2 0L TC Engine power OK Normal Chassis Type for A S C OK Type 1 Final drive OK AWD FF Base Transfer OK ACD SAS OK Present AWD OK Not present TCM OK Vehicles without TC SST Not present OK Vehicles with
185. eracn 35C 277 35C 262 G AND YAW RATE SENSOR 35C 278 35C 263 REMOVAL AND INSTALLATION 35C 278 35C 263 STEERING WHEEL SENSOR 35C 279 REMOVAL AND INSTALLATION 35C 279 WARNINGS REGARDING SERVICING OF SUPPLEMENTAL RESTRAINT SYSTEM SRS EQUIPPED VEHICLES WARNING Improper service or maintenance of any component of the SRS or any SRS related component can lead to personal injury or death to service personnel from inadvertent firing of the air bag or to the driver and passenger from rendering the SRS inoperative Service or maintenance of any SRS component or SRS related component must be performed only at an authorized MITSUBISHI dealer MITSUBISHI dealer personnel must thoroughly review this manual and especially its GROUP 52B Supplemental Restraint System SRS before beginning any service or maintenance of any component of the SRS or any SRS related component NOTE The SRS includes the following components SRS air bag control unit SRS warning light front impact sensors driver s and passenger s front air bag modules knee air bag module side airbag module curtain air bag module side impact sensors seat belt pre tensioners clock spring and interconnecting wiring Other SRS related components that may have to be removed installed in connection with SRS service or maintenance are indicated in the table of contents by an asterisk ACTIVE SKID CONTROL SYSTEM ASC GEN
186. ermediate connector C 43 joint connector C 46 ETACS ECU connector C 103 joint connector C 130 intermediate connector C 309 ETACS ECU connector and C 315 ETACS ECU connector Q Is the check result normal YES Go to Step 12 NO Repair the connector Then replace fuse No 17 or fusible link No 34 STEP 12 Wiring harness check between C 309 ETACS ECU connector and fusible link No 34 1 Remove fusible link No 34 2 Disconnect ETACS ECU connector C 309 and measure at the wiring harness side 3 Check the continuity short to ground between terminal No 1 and the ground OK No continuity Q Is the check result normal YES Go to Step 13 NO Repair the wiring harness between C 309 ETACS ECU connector terminal No 1 and fusible link No 34 Then replace fuse No 17 or fusible link No 34 STEP 13 Wiring harness check between C 315 ETACS ECU connector and C 103 joint connector 1 Disconnect the C 103 joint connector 2 Disconnect ETACS ECU connector C 315 and measure at the wiring harness side 3 Check the continuity short to ground between terminal No 4 and the ground OK No continuity Q Is the check result normal YES Go to Step 14 NO Repair the wiring harness between C 315 ETACS ECU connector terminal No 4 and C 103 joint connector terminal No 18 Then replace fuse No 17 or fusible link No 34 TSB Revision a ACTIVE SKID CONTROL SYSTEM ASC 35C 248 DIAGNOSIS
187. ervice Points P 00 16 When the diagnostic trouble code No C102B is not set the following conditions may be present e Wheel s spinning e Unstable vehicle attitude spin e External noise interference e Vehicle ran with the parking brake applied DIAGNOSIS Required Special Tools MB991958 Scan Tool M U T IIl Sub Assembly e MB991824 Vehicle Communication Interface V C I e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A MB991997 ASC check harness TSB Revision 2 ACTIVE SKID CONTROL SYSTEM ASC 35C 64 DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1032 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code Check if DTC No C102B is also set Q Is DTC C102B also set YES Carry out the diagnosis for code No C102B Refer to P 35C 38 NO Go to Step 4 STEP 4 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt RR gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 5 NO Reinstal
188. et valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed e The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 34 DIAGNOSIS DTC SET CONDITIONS ASC ECU monitors the electric current in each wheel speed sensor circuit If an open or short circuit in the wheel speed sensor circuit is detected ASC ECU sets a corresponding diagnostic trouble code PROBABLE CAUSES Current trouble Damaged wiring harness and connectors Noise interference Malfunction of wheel speed sensor ASC ECU malfunction Past trouble e Carry out the diagnosis with a particular emphasis on the wiring harness and connector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshooting Inspection Service Points P 00 16 DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub A
189. evision ACTIVE SKID CONTROL SYSTEM ASC 35C 205 DTC U0401 Engine malfunction detected DIAGNOSIS A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e If diagnostic trouble code U0401 is set in ASC ECU always diagnose CAN bus lines If there is any fault in the CAN bus lines an incorrect DTC may be set e When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Engine related signals are sent or received to and from between ASC ECU and engine ECU via CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is set when the engine ECU mal function has been detected PROBABLE CAUSES Malfunction of engine system Engine ECU malfunction ASC ECU malfunction External noise interference DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Usi
190. fective connector Then go to Step 13 STEP 12 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C1015 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 13 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 13 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1015 set YES Return to Step 1 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 33 DIAGNOSIS DTC C1020 Abnormality in RL wheel speed sensor circuit Connector A 05 ee AC708948AB Connector D 1 8 lt AC708955AE Connector C 45 AC708950AD A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inl
191. fer to P 35C 278 Then go to Step 10 STEP 5 Scan tool service data Check the following service data Refer to P 35C 255 e Item 08 Lateral G sensor e Item 09 G sensor e Item 12 Yaw rate sensor Q Is the check result normal YES Go to Step 6 NO Replace the G and yaw rate sensor Refer to P 35C 278 Then go to Step 10 STEP 6 Check of steering wheel sensor installation status Check that the steering wheel sensor is installed correctly Q Is the check result normal YES Go to Step 7 NO Install the steering wheel sensor correctly Refer to P 35C 279 Then go to Step 7 STEP 7 Wheel alignment check Refer to P 33 7 Q Is the check result normal YES After checking the wheel alignment perform the calibration of steering wheel sensor to make ASC ECU relearn the neutral point Refer to P 35C 267 Then go to Step 8 NO After adjusting the wheel alignment perform the calibration of steering wheel sensor to make ASC ECU relearn the neutral point Refer to P 35C 267 Then go to Step 8 STEP 8 Scan tool service data Check the following service data Refer to P 35C 255 e Item 11 Steering angle Q Is the check result normal YES Go to Step 9 NO Replace the steering wheel sensor Refer to P 35C 279 Then go to Step 10 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 149 DIAGNOSIS STEP 9 Check whether the DTC is reset Q Is DTC C123B set YES Replace the hydraulic unit inc
192. function P 00 15 STEP 17 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1048 set YES Return to Step 1 NO This diagnosis is complete TSB Revision 35C 110 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC C1049 RR wheel speed sensor control phase time exceeded Connector A 05 ee AC708948AB Connector C 47 AC708950 AE Connector D 09 Ke SS a aaa AC708955 AH A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse s
193. ge between the terminal No 32 and the body ground OK System voltage Q Is the check result normal YES Go to Step 7 NO Goto Step 5 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CN STEP 5 Fusible link check Check the fusible link No 27 Q Is the check result normal YES An open circuit may be present in the power supply circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 32 and the fusible link No 27 NO Goto Step 6 STEP 6 Wiring harness check between A 05 ASC ECU connector and fusible link No 27 1 Disconnect ASC ECU connector A 05 2 Remove fusible link No 27 3 Check the continuity short to ground between A 05 ASC ECU connector terminal No 32 and the ground OK No continuity Q Is the check result normal YES Replace the fusible link No 27 NO Short circuit may be present in the power supply circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 32 and fusible link No 27 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 246 DIAGNOSIS STEP 7 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the vol
194. gnition switch to the ON position 5 Select the relevant system from the menu 6 Select ABS ASC ASTC WSS from the system lists in System select and press OK button Select Special function in ABS ASC ASTC WSS Select Sensor calibration in Special function 9 Select G sensor calibration from the selected item and press OK button 10 The screen displays G sensor calibration The selected command will be executed Are you sure Caution Please check the execution conditions Then press OK button 11 Execute The command was executed will be shown Then press OK button 12 Select Lateral G sensor calibration from the selected item and press OK button 13 The screen displays Lateral G sensor calibration The selected command will be executed Are you sure Caution Please check execution conditions Then press OK button o N TSB Revision ACTIVE SKID CONTROL SYSTEM ASC E ON VEHICLE SERVICE 35C 267 14 Executed The command was executed will be shown Then press OK button 15 Learning neutral point complete 16 Turn the ignition switch to LOCK OFF position and then disconnect the scan tool STEERING WHEEL SENSOR CALIBRATION M1355009200156 A CAUTION After the next operation has been completed carry out the following two operations e Front alignment e Steering wheel sensor column switch assembly replacement removal and ins
195. go to Step 5 NO Replace the G and yaw rate sensor Refer to P 35C 278 Then go to Step 6 STEP 5 Check whether the DTC is reset Q Is DTC C1210 set YES Replace the G and yaw rate sensor Refer to P 35C 278 Then go to Step 6 NO The procedure is complete STEP 6 Check whether the DTC is reset Q Is DTC C1210 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 7 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 7 Check whether the DTC is reset Q Is DTC C1210 set YES Return to Step 1 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 169 DTC C1242 Abnormality in G and yaw rate sensor longitudinal G sensor A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e Do not drop the G and yaw rate sensor or subject it to a shock e When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve
196. hat the steering wheel sensor is installed correctly Refer to P 35C 279 Q Is the check result normal YES Go to Step 5 NO Install the steering wheel sensor correctly Refer to P 35C 279 Then go to Step 5 STEP 5 Wheel alignment check Q Is the check result normal YES After checking the wheel alignment perform the calibration of steering wheel sensor to make ASC ECU relearn the neutral point Refer to P 35C 267 Then go to Step 6 NO After adjusting the wheel alignment perform the calibration of steering wheel sensor to make ASC ECU relearn the neutral point Refer to P 35C 267 Then go to Step 6 STEP 6 Scan tool service data Check the following service data Refer to P 35C 255 e Item 11 Steering angle sensor Q Is the check result normal YES Go to Step 7 NO Replace the steering wheel sensor Refer to P 35C 279 Then go to Step 8 STEP 7 Check whether the DTC is reset Q Is DTC C1219 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 8 NO The procedure is complete STEP 8 Check whether the DTC is reset Q Is DTC C1219 set YES Return to Step 1 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 187 DIAGNOSIS DTC C121A Abnormality in steering wheel sensor initialization A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code
197. he special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor power supply terminal signal terminal No 43 and the body ground as well as between the ground terminal No 42 and the body ground OK 1 volt or less Q Is the check result normal YES Go to Step 6 NO Not normal at the terminal No 43 or 42 Go to Step 7 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 113 Check harness MB991 a ASC ECU A 05 ASC ECU harness connector AC400817CL DIAGNOSIS STEP 6 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 43 and the body ground as well as between the ground terminal No 42 and the body ground OK No continuity Q Is the check result normal YES Goto Step 9 NO Not normal at the terminal No 43 or 42 Go to Step 7 STEP 7 Connector check A 05 ASC ECU connector C 47 intermediate connector D 09 wheel speed sensor lt RR gt connector Q Is the check result normal YES Go to Step 8 NO Repair the defective connector Then g
198. heck result normal YES Replace the steering wheel sensor Refer to P 35C 279 Then go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 3 STEP 2 Check whether the DTC is reset Q Is DTC U0428 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 3 NO The procedure is complete STEP 3 Check whether the DTC is reset Q Is DTC U0428 set YES Return to Step 1 NO The procedure is complete TSB Revision 35C 208 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC U0251 AWC time out error Local CAN DTC U0440 AWC communication error Local CAN DTC U0435 AWC signal abnormality Local CAN Connector A 05 AC708948AB Connectors C 46 C 47 C 50 a AC708950AN A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION S AWC ECU outputs the signal to ASC ECU via the special CAN bus
199. heels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed e The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed DTC SET CONDITIONS ASC ECU monitors the signals from each wheel speed sensor while the vehicle is being driven If any abnormality below is detected in the sensor signals ASC ECU sets the relevant diagnostic trouble code e Missing wheel speed sensor signal e Wheel speed sensor signal continuously indicates lower value than the values of other wheel speed sensors TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 13 PROBABLE CAUSES Current trouble e Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection e Wheel bearing malfunction e Deformation of the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the magnetic encoder for wheel speed detection Malfunction of wheel speed sensor Improper installation of the wheel speed sensor ABS ECU malfunction Disturbance of magnetization pattern for magnetic encoder for wheel speed detection e The number of poles on the magnetic encoder for wheel speed detection the number of N pole and S pole is changed Past trouble e When the DTC No
200. ht Refer to GROUP 35A On vehicle Service P 35A 12 Then go to Step 7 STEP 4 Check of stoplight switch installation status Refer to GROUP 35A On vehicle Service P 35A 12 Q Is the check result normal YES Go to Step 5 NO Install the stoplight switch correctly Refer to GROUP 35A On vehicle Service P 35A 12 Then go to Step 7 STEP 5 Brake booster check Refer to GROUP 35A On vehicle Service P 35A 15 Q Is the check result normal YES Go to Step 6 NO Replace the brake booster Refer to GROUP 35A Master Cylinder Assembly and Brake Booster P 35A 27 Then go to Step 7 STEP 6 Check whether the DTC is reset Q Is DTC C121D set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 7 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 7 Check whether the DTC is reset Q Is DTC C121D set YES Return to Step 1 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 132 DIAGNOSIS DTC C121E Abnormality in brake fluid pressure sensor output signal A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is repla
201. ic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal COMMENTS ON TROUBLE SYMPTOM Although it is difficult to determine the trouble cause since it depends on the running status and road surface condition a malfunction of hydraulic circuit may be present if no diag nostic trouble code is detected If a wheel or tire of other than the genuine specified size is mounted the ABS skid control TCL may be activated pre maturely If non genuine braking device or non genuine impact reduc ing device is mounted the ABS skid control TCL may be activated prematurely PROBABLE CAUSES Installation of wheel or tire other than genuine specified size Tire pressure abnormality Tire wear and deterioration Installation of non genuine braking device or non genuine impact reducing device Wheel alignment abnormality Malfunction of brake related components Malfunction of wheel speed sensor Malfunction of G and yaw rate sensor Malfunction of steering wheel sensor Malfunction of hydraulic unit integrated with ASC ECU Malfunction of hydraulic circuit External noise interference DIAGNOSIS Required Special Tools MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C I e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A MB991997 ASC check harness TSB Revision i ACT
202. ic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU receives the vehicle information stored in ETACS ECU via CAN bus lines DTC SET CONDITIONS ASC ECU communicates with ETACS ECU via CAN bus lines This diagnostic trouble code is set if the vehicle information stored in ETACS ECU has been altered from the one that was stored at the previous ignition switch ON PROBABLE CAUSES e ETACS ECU or ASC ECU which was equipped with other vehicle is used Malfunction of ETACS ECU ASC ECU malfunction External noise interference DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 6 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 165 STEP 2 Scan tool diagnostic trouble code Check that the diagnostic trouble code U1415 or U1417 is set in ASC ECU Q
203. ight does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C102B set YES Return to Step 1 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 43 DIAGNOSIS DTC C1011 Abnormality in FL wheel speed sensor signal Connector A 05 AC708948AB Connector A 11 AC708949 AB A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel spee
204. ignals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 111 DIAGNOSIS DTC SET CONDITIONS This diagnostic trouble code is set if any malfunction below is detected e When the brake fluid pressure is decreased for a long time e When the brake fluid pressure is held for a long time NOTE ASC controls the vehicle based on the wheel speed sig nal When the brake fluid pressure is decreased or held for an abnormally long time the wheel speed sensor signal may have a problem PROBABLE CAUSES Damaged wiring harness and connectors External noise interference Malfunction of wheel speed sensor ABS ECU malfunction Excessive gap between the wheel speed sensor and the wheel speed detection encoder Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the wheel speed detection encoder Wheel bearing malfunction Improper installation of the wheel speed sensor Deformation of the wheel speed detection encoder Disturbance of magnetization pattern for wheel speed detection encoder e Missing teeth of the wheel speed detection encoder DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III US
205. ing service data Refer to P 35C 255 e Item No 03 RL wheel speed sensor Q Is the check result normal YES Go to Step 16 NO Goto Step 5 STEP 5 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor power supply terminal signal terminal No 36 and the body ground as well as between the ground terminal No 37 and the body ground OK 1 volt or less Q Is the check result normal YES Goto Step 6 NO Not normal at terminal 34 or 33 Go to Step 7 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 107 Check harness MB991 Ne ASC ECU A 05 ASC ECU harness connector AC400817CI DIAGNOSIS STEP 6 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 36 and the body ground as well as between the ground terminal N
206. ing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C102A set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code Check if DTC No C1020 is also set Q Is DTC C1020 also set YES Carry out the diagnosis for code No C1020 Refer to P 35C 33 NO Go to Step 4 STEP 4 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt RL gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 5 NO Reinstall the wheel speed sensor lt RL gt correctly Refer to P 35C 274 Then go to Step 9 STEP 5 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 6 NO Replace the wheel speed sensor lt RL gt Refer to P 35C 274 Then go to Step 9 STEP 6 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt RL gt for loose ness Refer to GROUP 27 On vehicle Service P 27 33 Q Is the check result normal YES Go to Step 7 NO Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 TSB Revision 35C 78 ACTIVE SKID CONTROL SYSTEM ASC Rear Wheel bearing Rear whe
207. ion Procedure 10 Skid control TCL does not operate A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 TECHNICAL DESCRIPTION COMMENT In case of this trouble symptom the operation of skid con trol TCL system may be disabled In this case a diagnostic trouble code may be set by the skid control TCL system using the scan tool PROBABLE CAUSES Low battery output Wiring harness or connector failure of CAN bus line ASC ECU malfunction Different ETACS ECU abnormal variant coding information Abnormal engine coding data DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Check the DTC Using scan tool check the diagnostic trouble code for ASC sys tem Refer to P 35C 20 Q Is the check result normal YES Go to Step 2 NO Carry out the diagnosis for the DTC Refer to P 35C 20 TSB Revision
208. ircuit Repair the wiring harness between A 05 ASC ECU connector terminal No 1 and the fusible link No 26 NO Repair the defective connector TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 125 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CO DIAGNOSIS STEP 8 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the terminal No 16 and the body ground as well as between the terminal No 47 and the body ground OK Continuity exists 2 Q or less Q Is the check result normal YES Go to Step 10 NO Goto Step 9 STEP 9 Connector check A 05 ASC ECU connector Q Is the check result normal YES An open circuit may be present in the ground circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 16 and the ground as well as between A 05 ASC ECU connector terminal No 47 and the ground NO Repair the defective connector STEP 10 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is
209. is disabled due to the fail safe function the M U T IIl actuator test cannot be performed e After the actuator test has been performed the ABS warning light brake warning light ASC warning display and ASC OFF indicator light illuminate until the ignition switch is turned to ON again or the communication between scan tool and ASC ECU is terminated Pedal operation Solenoid valve position ABS Solenoid valve position TCL Checking the brake force Checking the brake force M U T III actuator test Faai 02 03 04 Depressed Released M U T III actuator test No 05 06 07 08 M U T III actuator test foe 02 03 04 start Increase in pressure Approx 2 seconds Steady pressure Reduction in pressure M U T IIl actuator test Fa No 05 06 07 08 start Increase in pressure Steady pressure Approx 2 seconds Reduction in pressure M U T III actuator test WA No 01 02 03 04 Lock Approx 3 seconds M U T III actuator test Fo 06 07 08 Those with a braking effort mm em em ee ee oe oe oe Approx l 3 seconds l When the pedal is free Those without a braking effot AC400780AE 5 This is indicated as shown in the above TSB Revision ACTIVE SKID CONTROL SYSTEM ASC ON VEHICLE SERVICE 35C 265 6 When any malfunction has been found take a necessary action according to the Judgment Table
210. is for the DTC Refer to P 35C 20 NO Goto Step 3 STEP 3 M U T IIl actuator test Perform the following actuator tests from the combination meter system to check if the brake warning light is illuminated Refer to GROUP 54A Combination Meter Actuator Test Table P 54A 82 e Item 07 Indicator Q Is the check result normal YES Go to Step 4 NO Carry out the diagnosis of the combination meter Refer to GROUP 54A Combination Meter Trouble Symptom Chart P 54A 59 Then go to Step 7 STEP 4 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if diagnostic trouble code No U0141 is set by the combination meter system Q Is the DTC set YES Diagnose the combination meter Refer to GROUP 54A Combination Meter Troubleshooting P 54A 45 Then go to Step 7 NO Goto Step 5 STEP 5 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if diagnostic trouble code No U0121 is set by ETACS system Q Is the DTC set YES Diagnose the ETACS ECU Refer to GROUP 54A ETACS Troubleshooting P 54A 591 Then go to Step 7 NO Goto Step 6 STEP 6 Retest the system Q Does the brake warning light turn ON and OFF normally YES Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 7 TSB Revision
211. it incorporates in ASC ECU Refer to P 35C 272 Then go to Step 8 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 8 Check whether the DTC is reset Q Is DTC C1242 set YES Return to Step 1 NO The procedure is complete DTC C123C Abnormality in G and yaw rate sensor lateral G or yaw rate A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the steering wheel sensor is replaced always perform calibration to make ASC ECU learn the neutral point Refer to P 35C 267 e Do not drop the G and yaw rate sensor or subject it to a shock e When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e ASC ECU supplies power to the G and yaw rate sensor at the terminal No 1 e The G and yaw rate sensor outputs the signal to ASC ECU via the special CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is
212. it integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU receives signals necessary for the operations of ABS skid control and TCL from the engine control module transaxle assembly with built in ECU lt TC SST gt S AWC ECU ETACS ECU and the steering wheel sensor via the CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is stored if ASC ECU cannot receive signals necessary for the operations of ABS skid con trol and TCL from the engine control module transaxle assem bly with built in ECU lt TC SST gt S AWC ECU ETACS ECU and the steering wheel sensor PROBABLE CAUSES Engine ECU malfunction Malfunction of transaxle assembly lt TC SST gt S AWC ECU malfunction ETACS ECU malfunction Steering wheel sensor malfunction Malfunction of the CAN bus ASC ECU malfunction Local CAN bus line malfunction Interchanging of ETACS ECU with another vehicle TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 160 DIAGNOSIS DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines
213. k the following service data Refer to P 35C 255 e Item No 01 FL wheel speed sensor Q Is the check result normal YES Go to Step 12 NO Go to Step 4 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CB Check harness ASC ECU AC400817CC MB991997 A 05 ASC ECU harness connector 35C 25 DIAGNOSIS STEP 4 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor power supply terminal signal terminal No 45 and the body ground as well as between the ground terminal No 46 and the body ground OK 1 volt or less Q Is the check result normal YES Go to Step 5 NO Not normal at the terminal No 45 or 46 Go to Step 6 STEP 5 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Mea
214. kprobing 2 Measure the voltage between the terminal No 4 and the body ground OK System voltage Q Is the check result normal YES Go to Step 13 NO Replace the ETACS ECU Refer to GROUP 54A ETACS ECU P 54A 676 Then go to Step 17 STEP 13 Connector check C 103 joint connector C 130 intermediate connector Q Is the check result normal YES Go to Step 14 NO Repair the defective connector STEP 14 Voltage measurement at the A 05 ASC ECU connector 1 Disconnect the connector connect the ABS check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the voltage between the terminal No 2 and the body ground OK System voltage Q Is the check result normal YES Go to Step 15 NO Repair the wiring harness between C 315 Check harness ETACS ECU connector terminal No 4 and A 05 ASC ECU connector terminal No 2 MB991 S ASC ECU A 05 ASC ECU harness connector AC400817CN TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 155 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CO DIAGNOSIS STEP 15 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ABS check harness Special tool MB991997 to the wiring harness side connector and mea
215. l YES Go to Step 16 NO Repair the defective connector Then go to Step 17 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 103 Oil seal I Ps Magnetic encoder real ice bearing AC704652 AB DIAGNOSIS STEP 13 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt FR gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 14 NO Reinstall the wheel speed sensor lt FR gt correctly Refer to P 35C 274 Then go to Step 17 STEP 14 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt FR gt for loose ness Refer to GROUP 26 On vehicle Service P 26 7 Q Is the check result normal YES Go to Step 15 NO Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 15 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Go to Step 16 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the front hub assembly Refer to GRO
216. l YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 5 STEP 2 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if any other diagnostic trou ble code is set in the ECU corresponding to the relevant diag nosis Q Is other DTC set YES Perform troubleshooting for the diagnostic trouble code that is set NO Goto Step 3 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 201 DIAGNOSIS STEP 3 ETACS ECU coding data check Check the following coding data stored in ETACS ECU Refer to GROUP 00 Coding Table P 00 39 Vehicle line OK LANCER EVO Transmission OK Vehicles without TC SST 5MT OK Vehicles with TC SST TC SST Engine type OK D4 V V T 2 0L TC Engine power OK Normal Chassis Type for A S C OK Type 1 Final drive OK AWD FF Base Transfer OK ACD SAS OK Present AWD OK Not present TCM OK Vehicles without TC SST Not present OK Vehicles with TC SST Present ACDAYC OK Present Q Is the check result normal YES Go to Step 4 NO Replace the ETACS ECU Refer to GROUP 54A ETACS ECU P 54A 676 Then go to Step 5 STEP 4 Check whether the DTC is reset Q Is DTC U0100 U0101 U0126 U0141 or U0136 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 5 NO Intermittent malfunction Refer
217. l the wheel speed sensor lt RR gt correctly Refer to P 35C 274 Then go to Step 16 STEP 5 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 6 NO Replace the wheel speed sensor lt RR gt Refer to P 35C 274 Then go to Step 16 STEP 6 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt RR gt for loose ness Refer to GROUP 27 On vehicle Service P 27 33 Q Is the check result normal YES Go to Step 7 NO Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC Rear Wheel bearing Rear wheel hub bl Magnetic assemoy encoder AC608248 AB Check harness MB991 S ASC ECU A 05 ASC ECU harness connector AC400817CK 35C 65 DIAGNOSIS STEP 7 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Go to Step 8 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the rear wheel hub assembly Refer to GROUP 27
218. l value as a single unit gt 12 Yaw rate sensor left Vehicle stopped level 3 6 to 3 6 deg s turn right turn Running 100 to 100 deg s 14 Brake switch The brake pedal is depressed ON The brake pedal is released OFF 15 Emission test mode Emission test mode ON ON Emission test mode OFF OFF 26 Brake fluid pressure Brake fluid level is lower than the Low switch LOWER marking Brake fluid level is higher than Normal the LOWER marking TSB Revision 2 ACTIVE SKID CONTROL SYSTEM ASC 35C 256 DIAGNOSIS Item No Check item Check conditions Normal conditions 28 ASC TCL off switch ASC OFF switch not operated ON ASC control is available When ASC OFF switch is OFF operated pressed shortly ASC control is prohibited When ASC OFF switch is ON operated pressed and held for 15 seconds or more ASC OFF control is prohibited by fail safe 45 SAS OK flag When the learning is completed Comp When the learning is not Not Comp completed When the steering wheel sensor SAS fail is faulty SAS fail amp Not Comp 65 Engine Speed When the accelerator pedal is The tachometer display and depressed engine started the scan tool display almost agree with each other 66 Engine torque Displays the engine torque 67 APS sensor Displays the accelerator pedal opening angle 68 Allow ESP torque request Engine torque intervention is Allow
219. lace the charging system componenit s and then go to Step 17 STEP 4 Charging system check Refer to GROUP 16 Output Current Test P 16 8 Q Is the charging system in good condition YES Go to Step 5 NO Repair or replace the charging system component s and then go to Step 17 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 192 DIAGNOSIS STEP 5 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the voltage between the terminal No 32 and the body ground OK System voltage Q Is the check result normal YES Go to Step 7 NO Goto Step 6 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CN STEP 6 Connector check A 05 ASC ECU connector Q Is the check result normal YES An open or short circuit may be present in the power supply circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 32 and the fusible link No 27 NO Repair the defective connector and then go to Step 17 STEP 7 Check of fuse No 17 and fusible link No 34 Visually check for open circuit in the fuse No 17 and the fusible link No 34 Q Is the check result normal YES Go to Step 8
220. le code for other systems Using scan tool MB991958 check if diagnostic trouble code No U0141 is set by the combination meter system Q Is the DTC set YES Diagnose the combination meter Refer to GROUP 54A Combination Meter Troubleshooting P 54A 45 Then go to Step 7 NO Goto Step 5 STEP 5 Scan tool diagnostic trouble code for other systems Using scan tool MB991958 check if diagnostic trouble code No U0121 is set by ETACS system Q Is the DTC set YES Diagnose the ETACS ECU Refer to GROUP 54A ETACS Troubleshooting P 54A 591 Then go to Step 7 NO Goto Step 6 STEP 6 Retest the system Q Does the ASC warning display turn ON and OFF normally YES Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 NO Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 7 TSB Revision j ACTIVE SKID CONTROL SYSTEM ASC 35C 234 DIAGNOSIS STEP 7 Retest the system Q Does the ASC warning display turn ON and OFF normally YES The procedure is complete NO Return to Step 1 Inspection Procedure 7 The ASC OFF display remains illuminated after the engine is started Connector C 313 Connector C 135 ETACS ECU is 313 BR J ae AC708972AQ AC708950AT AC708950 AU A CAUTION e Whenever the ECU is replaced ensure that the CAN bus lines are normal e
221. lem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e Do not drop the G and yaw rate sensor or subject it to a shock e When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e ASC ECU supplies power to the G and yaw rate sensor at the terminal No 1 e The G and yaw rate sensor outputs the signal to ASC ECU via the special CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is set if any malfunction below is found TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 175 DIAGNOSIS e Abnormality is detected by the self diagnosis of the G and yaw rate sensor e Output value of the G and yaw rate sensor is not within the standard value range NOTE This diagnostic trouble code may be set when G and yaw rate sensor is put on the turntable turning at high speed PROBABLE CAUSES Improper installation of the G and yaw rate sensor Damaged wiring harness and connectors G and yaw rate senso
222. level switch connector terminal No 1 and the body ground Q Is the check result normal YES Go to Step 10 NO Repair the wiring harness STEP 10 Parking brake lever stroke check Refer to GROUP 36 On vehicle Service P 36 11 Q Is the check result normal YES Go to Step 11 NO Adjust the parking brake lever stroke Refer to GROUP 36 On vehicle Service P 36 11 Then go to Step 18 TSB Revision Z ACTIVE SKID CONTROL SYSTEM ASC 35C 224 DIAGNOSIS STEP 11 Parking brake switch check Refer to GROUP 36 On vehicle Service P 36 12 Q Is the check result normal YES Go to Step 12 NO Replace the parking brake switch Refer to GROUP 36 Parking Brake Lever P 36 13 Then go to Step 18 STEP 12 Connector check C 122 parking brake switch connector Q Is the check result normal YES Go to Step 13 NO Repair the defective connector STEP 13 Voltage measurement at C 122 parking brake switch connector 1 Disconnect the connector and measure at the wiring harness side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the terminal No 1 and the body ground OK System voltage Q Is the check result normal YES Go to Step 17 NO Go to Step 14 STEP 14 Connector check C 04 combination meter connector C 23 intermediate connector Q Is the check result normal YES Go to Step 15 NO Repair the defective connector STEP 15 Voltage m
223. lic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Steering wheel sensor sends its status signal to ASC ECU TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 189 DTC SET CONDITIONS This diagnostic trouble code is set when ASC ECU detects that the steering wheel sensor has a malfunction PROBABLE CAUSES e Steering wheel sensor malfunction e ASC ECU malfunction e External noise interference DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 4 STEP 2 Check whether the DTC is reset Q Is DTC C2205 set YES Replace the steering wheel sensor Refer to P 35C 279 Then go to Step 3 NO The procedure is complete STEP 3 Check whether the DTC is re
224. line ASC OFF switch Outputs the ASC ON OFF signal to ASC ECU Master cylinder pressure sensor Integrated into the hydraulic unit converts the signal of brake fluid pressure in master cylinder to the voltage value then outputs the value to ASC ECU Wheel cylinder pressure sensor Integrated into the hydraulic unit converts the signal of brake fluid pressure in wheel cylinder of each wheel to the voltage value then outputs the value to ASC ECU TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 5 GENERAL INFORMATION Parts name Functional description Actuator Hydraulic unit Drives the solenoid valve using the signal from ASC ECU and controls the brake fluid pressure for each wheel ABS warning light Informs the driver of the system status by illuminating flashing or turning off the warning light according to the signal from ASC ECU ABS warning display Brake warning light Informs the driver of the system status by illuminating or turning off the warning light according to the signal from ASC ECU Used as the warning light for the parking brake brake fluid level and EBD control Informs the driver of the system status by illuminating or turning off the warning light according to the signal from ASC ECU Brake warning display Used as the warning light for the brake fluid level and EBD control Informs the driver of the system status by illuminating or
225. lowing conditions may be present e Wheel s spinning e Unstable vehicle attitude spin e External noise interference e Vehicle ran with the parking brake applied DIAGNOSIS Required Special Tools MB991958 Scan Tool M U T IIl Sub Assembly e MB991824 Vehicle Communication Interface V C I e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A MB991997 ASC check harness TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 57 STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1027 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code Check if DTC No C1020 is also set Q Is DTC C1020 also set YES Carry out the diagnosis for code No C1020 Refer to P 35C 33 NO Go to Step 4 STEP 4 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt RL gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 5 NO Reinstall the wheel speed sensor lt RL gt correctly Refer to P 35C 274 Then go to St
226. lse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 93 DTC SET CONDITIONS This diagnostic trouble code is set if any malfunction below is detected e When the brake fluid pressure is decreased for a long time e When the brake fluid pressure is held for a long time NOTE ASC controls the vehicle based on the wheel speed sig nal When the brake fluid pressure is decreased or held for an abnormally long time the wheel speed sensor signal may have a problem PROBABLE CAUSES Damaged wiring harness and connectors External noise interference Malfunction of wheel speed sensor ABS ECU malfunction Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection Adhesion of foreign materials on the wheel speed sensor e Adhesion of foreign materials on the magnetic encoder for wheel speed detection e Wheel bearing malfunction e Improper installation of the wheel speed sensor e Deformation of the magnetic encoder for wheel speed detection e Disturbance of magnetization pattern for magnetic encoder for wheel speed detection e Missing teeth of the magnetic encoder for wheel speed detection DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interfa
227. luid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e ASC ECU sends the illumination request signal of the brake warning light to the combination meter through ETACS ECU via CAN communication e When the ignition switch is turned ON ASC ECU illumi nates the brake warning light via ETACS ECU for approxi mately 3 seconds for the purpose of bulb check TECHNICAL DESCRIPTION COMMENT In the case of this trouble symptom there may be a malfunction to the CAN bus line ETACS ECU combination meter or ASC ECU PROBABLE CAUSES Damaged wiring harness and connectors Malfunction of ETACS ECU Combination meter malfunction ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 Then go to Step 7 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 229 DIAGNOSIS STEP 2 Scan tool diagnostic trouble code Using scan tool check the diagnostic trouble code for ASC sys tem Q Is any DTC set YES Carry out the diagnos
228. m each wheel speed sensor while the vehicle is being driven If any abnormality below is detected in the sensor signals ASC ECU sets the relevant diagnostic trouble code Irregular change in the wheel speed sensor signal Wheel speed sensor signal continuously indicates higher value than the values of other wheel speed sensors PROBABLE CAUSES Current trouble Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection e Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the magnetic encoder for wheel speed detection Wheel bearing malfunction Malfunction of wheel speed sensor Damaged wiring harness and connectors External noise interference Improper installation of the wheel speed sensor Deformation of the magnetic encoder for wheel speed detection e ASC ECU malfunction e Disturbance of magnetization pattern for magnetic encoder for wheel speed detection The number of poles on the magnetic encoder for wheel speed detection the number of N pole and S pole is changed Past trouble When DTC No C1020 is also set perform the diagnosis with a particular emphasis on the wiring harness and con nector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshoot ing Inspection Service Points P 00 16 When the diagnostic trouble code No C1020 is not set the fol
229. m the calibration to make ASC ECU learn the neutral point Refer to P 35C 267 e Do not drop the G and yaw rate sensor or subject it toa shock e When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU controls ASC by calculating the data sent from the wheel speed sensor steering wheel sensor and G and yaw rate sensor DTC SET CONDITIONS This diagnostic trouble code is set when ASC control is oper ated for a prolonged period NOTE This diagnostic trouble code may be set when the vehi cle runs on a Slippery or rough road or when the vehicle per forms a steady state cornering TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 147 DIAGNOSIS PROBABLE CAUSES Steering wheel sensor malfunction G and yaw rate sensor malfunction Improper installation of steering wheel sensor or G and yaw rate sensor ASC ECU malfunction Different steering wheel e Wheel alignment not performed DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Ca
230. mal YES Go to Step 12 NO Not normal at the terminal No 43 or 42 Go to Step 10 STEP 10 Connector check A 05 ASC ECU connector C 47 intermediate connector D 09 wheel speed sensor lt RR gt connector Q Is the check result normal YES Go to Step 11 NO Repair the defective connector Then go to Step 16 STEP 11 Wiring harness check between A 05 ASC ECU connector terminal No 43 and D 09 wheel speed sensor lt RR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 42 and D 09 wheel speed sensor lt RR gt connector terminal No 2 e Short circuit check of wheel speed sensor lt RR gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt RR gt Refer to P 35C 274 Then go to Step 16 NO Repair the wiring harness Then go to Step 16 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 67 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CM DIAGNOSIS STEP 12 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 43 and the
231. mediate connector D 18 wheel speed sensor lt RL gt connector Q Is the check result normal YES Go to Step 11 NO Repair the defective connector Then go to Step 16 STEP 11 Wiring harness check between A 05 ASC ECU connector terminal No 36 and D 18 wheel speed sensor lt RL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 37 and D 18 wheel speed sensor lt RL gt connector terminal No 2 e Short circuit check of wheel speed sensor lt RL gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt RL gt Refer to P 35C 274 Then go to Step 16 NO Repair the wiring harness Then go to Step 16 TSB Revision 35C 60 ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CJ DIAGNOSIS STEP 12 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 36 and the body ground OK System voltage Q Is the check result normal YES Go to Step 13 NO Go to Step 15 STEP 13 Connector check A 05 ASC
232. n Prohibited Prohibited Prohibited Prohibited Prohibited Prohibited ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS EBD ABS Skid control TCL Abnormality in brake fluid pressure sensor circuit Executed Prohibited Prohibited Prohibited Abnormality in brake fluid pressure sensor output signal Executed Prohibited Prohibited Prohibited Abnormality in wheel fluid pressure sensor circuit Executed Prohibited Prohibited Prohibited Abnormality in wheel fluid pressure sensor output signal Executed Prohibited Prohibited Prohibited Abnormality in stoplight switch circuit Executed Executed Prohibited Prohibited Prolonged operation of ASC Executed Executed Prohibited Prohibited Abnormality in ASC ECU Prohibited 2 Prohibited 2 Prohibited Prohibited Abnormality in battery voltage high voltage 18 0 1 0 V or more Prohibited Prohibited Prohibited Prohibited Brake fluid filling not completed Executed Executed Executed Executed Torque request signal rejection Executed Executed Prohibited Prohibited CAN time out error Executed Executed Prohibited Prohibited VIN not recorded Re execution of variant coding Abnormality in G and yaw rate sensor Abnormality in longitudinal G sensor output voltage Executed Executed E
233. n e ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 TSB Revision 35C 212 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC U1003 set YES Go to Step 3 NO The procedure is complete STEP 3 Connector check A 05 ASC ECU connector C 46 S AWC ECU connector C 47 intermediate connector C 50 joint connector Q Is the check result normal YES Go to Step 4 NO Repair the connector and then go to Step 7 STEP 4 Wiring harness check between A 05 ASC ECU connector terminal No 18 and C 38 G and yaw rate sensor connector terminal No 2 between A 05 ASC ECU connector terminal No 19 and C 38 G and yaw rate sensor connector terminal No 3 between C 46 S AWC ECU connector terminal No 9 and C 38 G and yaw rate sensor connector terminal No 2 between C 46 S AWC ECU connector terminal No 10 and C 38 G and yaw rate sensor connector terminal No 3 e Open or short circuit check of communic
234. n go to Step 17 STEP 8 Wiring harness check between A 05 ASC ECU connector terminal No 45 and A 11 wheel speed sensor lt FL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 46 and A 11 wheel speed sensor lt FL gt connector terminal No 2 e Short circuit check of wheel speed sensor lt FL gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt FL gt Refer to P 35C 274 Then go to Step 17 NO Repair the wiring harness Then go to Step 17 TSB Revision 35C 96 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CD ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 9 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 45 and the body ground OK System voltage Q Is the check result normal YES Go to Step 10 NO Goto Step 12 STEP 10 Wiring harness check between A 05 ASC ECU connector terminal No 45 and A 11 wheel speed sensor lt FL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 46 and A 11 wheel spee
235. n vehicle Service P 27 33 Q Is the check result normal YES Go to Step 15 NO Replace the rear wheel hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 15 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Go to Step 16 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the rear hub assembly Refer to GROUP 27 Rear Axle Hub Assembly P 27 36 STEP 16 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1049 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 17 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 17 Check whether the DTC is reset Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1049 set YES Return to Step 1 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 1 16 DIAGNOSIS DTC C104B Ab
236. nal No 2 and C 48 stoplight switch connector terminal No 1 Repair the wiring harness STEP 17 Voltage measurement at C 312 ETACS ECU connector 1 Without disconnecting the connector measure by backprobing 2 Measure the voltage between the terminal No 16 and the body ground OK The brake pedal is released Approximately 0 V The brake pedal is depressed System voltage Q Is the check result normal YES Go to Step 18 NO An open circuit may be present in the wiring harness between C 312 ETACS ECU connector terminal No 16 and C 48 stoplight switch connector terminal No 1 Repair the wiring harness TSB Revision 35C 146 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 18 Check whether the DTC is reset Q Is DTC 1000 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 19 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 19 Check whether the DTC is reset Q Is DTC 1000 set YES Return to Step 1 NO The procedure is complete DTC C123B Prolonged operation of ASC A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the steering wheel sensor is replaced or re installed always perfor
237. nal No 37 and D 18 wheel speed sensor lt RL gt connector terminal No 2 e Short circuit check of wheel speed sensor lt RL gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt RL gt Refer to P 35C 274 Then go to Step 13 NO Repair the wiring harness Then go to Step 13 STEP 8 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 36 and the body ground OK System voltage Q Is the check result normal Check harness YES Go to Step 9 NO Goto Step 11 MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CJ STEP 9 Wiring harness check between A 05 ASC ECU connector terminal No 36 and D 18 wheel speed sensor lt RL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 37 and D 18 wheel speed sensor lt RL gt connector terminal No 2 e Open circuit check of wheel speed sensor lt RL gt circuit Q Is the check result normal YES Go to Step 10 NO Repair the wiring harness Then go to Step 13 TSB Revision ACTIVE SKID CONTROL SYSTEM AS
238. ncy of the pulse signals to determine the wheel speed DTC SET CONDITIONS AS wh C ECU monitors the signals from each wheel speed sensor ile the vehicle is being driven If any periodical drop abnor mality is detected in the sensor signals ASC ECU sets the rel evant diagnostic trouble code PROBABLE CAUSES e Wheel bearing malfunction e Deformation of the magnetic encoder for wheel speed detection Adhesion of foreign materials on the magnetic encoder for wheel speed detection e ASC ECU malfunction e Disturbance of magnetization pattern for magnetic encoder for wheel speed detection Missing teeth of the magnetic encoder for wheel speed detection DIAGNOSIS Re quired Special Tools MB991958 Scan Tool M U T IIl Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A MB991997 ASC check harness TSB Revision 35C 86 Oil seal I gt ws Magnetic encoder meal 6 bearing AC704652 AB ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C
239. ndicate any malfunction 2 On snowy or gravel roads a vehicle with ABS sometimes requires a longer braking distance compared to the one without ABS Considering this characteristics advise the customer to drive the vehicle safely at lower speed and not to place too much confidence on the ABS system when driving on such roads 3 The detection conditions of diagnostic trouble code differ with each diagnostic trouble code When the trouble symptoms are rechecked conditions described in the description for the diagnostic trouble code procedures must be satisfied ABS WARNING LIGHT AND BRAKE WARNING LIGHT INSPECTION M1352012000670 Check if the ABS warning light and brake warning light is illumi nated as follows NOTE The brake warning light is used as the warning lights for the parking brake brake fluid level and EBD control TSB Revision a ACTIVE SKID CONTROL SYSTEM ASC 35C 8 DIAGNOSIS ABS warning light 1 When the ignition switch is turned to the ON position the ABS warning light and brake warning light illuminate 2 After an illumination for approximately 3 seconds the ABS warning light and brake warning light will be turned off 2 3 Other than the above the system may have a malfunction Check the diagnostic trouble code NOTE e 1 ABS warning light may remain illuminated until the vehi cle speed reaches approximately 10 km h Only when a diagnostic trouble code relating to the wheel speed s
240. nect the circuit tester Q range to the stoplight switch connector terminal Nos 1 and 2 3 When continuity does not exist with the plunger pressed from the outer case end face by the dimension shown in the figure and when continuity exists with the plunger released the switch is in good condition Q Is the check result normal YES Go to Step 7 NO Replace the stoplight switch Refer to GROUP 35A Brake Pedal P 35A 25 Then go to Step 19 STEP 7 Check for diagnostic trouble codes of other systems Check that no DTC is set by the rear combination light Refer to GROUP 54A Rear Combination Light Diagnostic Trouble Code Chart P 54A 196 Q Is the check result normal YES Go to Step 8 NO Check whether the combination meter related DTC is set Refer to GROUP 54A Rear Combination Light Diagnostic Trouble Code Chart P 54A 196 Then go to Step 19 STEP 8 ETACS ECU fuse No 2 check Q Is the check result normal YES Go to Step 14 NO Goto Step 9 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 143 DIAGNOSIS STEP 9 Connector check C 43 joint connector C 47 intermediate connector C 48 stoplight switch connector C 304 ETACS ECU connector C 309 ETACS ECU connector C 312 ETACS ECU connector D 11 intermediate connector D 17 intermediate connector F 05 high mounted stoplight F 06 rear combination light stoplight RH F 25 rear combination light stoplight LH F 27 intermediat
241. ng scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 5 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 206 DIAGNOSIS STEP 2 Scan tool diagnostic trouble code Using scan tool MB991958 check if any diagnostic trouble code other than code No U0401 is set in ASC ECU Q Is any DTC set YES Troubleshoot the relevant diagnostic trouble code and then go to Step 5 NO Goto Step 3 STEP 3 Diagnostic trouble code check of other systems using scan tool MB991958 Using scan tool MB991958 check if a diagnostic trouble code is set in the engine control module Q Is any DTC set YES Troubleshoot the relevant diagnostic trouble code and then go to Step 5 NO Go to Step 4 STEP 4 Check whether the DTC is reset Q Is DTC U0401 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 5 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 5 Check whether the DTC is reset Q Is DTC U0401 set YES Return to Step 1 NO The procedure is complete DTC U0428 Communication error in steering wheel sensor A CAUTION e If diagnostic trouble code U0428 is set in ASC ECU
242. nit Refer to P 35C 277 Q Is the check result normal YES Go to Step 6 NO Replace the wheel speed sensor lt FL gt Refer to P 35C 274 Then go to Step 9 STEP 6 Wheel bearing looseness check NOTE Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detec tion magnet encoder Check the wheel bearing lt FL gt for loose ness Refer to GROUP 26 On vehicle Service P 26 7 Q Is the check result normal YES Go to Step 7 NO Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 71 Oil seal SL PS Magnetic encoder nae ins bearing AC704652 AB DIAGNOSIS STEP 7 Check of wheel speed detection encoder Check the encoder for adhesion of foreign materials or defor mation Q Is the check result normal YES Goto Step 8 NO Adhesion of foreign materials Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet magnetic substance and magnetic attraction NO Deformation Replace the front hub assembly Refer to GROUP 26 Front Axle Hub Assembly P 26 9 STEP 8 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or
243. nition switch ON Approximately supply battery voltage RESISTANCE AND CONTINUITY BETWEEN HARNESS SIDE CONNECTOR TERMINALS Required Special Tool MB991997 ASC Check Harness 1 Operate the lock lever as shown in the figure to disconnect the ASC ECU wiring harness connector TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 261 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CO DIAGNOSIS 2 When performing the continuity check turn the ignition switch to LOCK OFF position connect special tool ASC Check Harness MB991997 as shown in the figure and disconnect the ASC ECU connector 3 Check for continuity between terminals shown in the chart below 4 Terminal layout is shown in the figure Terminal No Signal Normal conditions 16 body ground Ground Continuity exists 2 Qor less 47 body ground Ground Continuity exists 2 Qor less TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 262 SPECIAL TOOLS SPECIAL TOOLS Tool number and Supersession Application name MB991958 MB991824 KIT A CAUTION a MB991824 NOTE G MB991826 M U T II main harness A b MB991827 M U T III Trigger MB991910 should be used c MB991910 Harness is not M U T IIl main harness B and C d MB991911 necessary wh
244. nnect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 34 and the body ground OK System voltage Q Is the check result normal Check harness YES Go to Step 9 NO Goto Step 11 MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CG STEP 9 Wiring harness check between A 05 ASC ECU connector terminal No 34 and A 03 wheel speed sensor lt FR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 33 and A 03 wheel speed sensor lt FR gt connector terminal No 2 e Open circuit check of wheel speed sensor lt FR gt circuit Q Is the check result normal YES Go to Step 10 NO Repair the wiring harness Then go to Step 13 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 32 DIAGNOSIS STEP 10 Check of wheel speed sensor as a single unit Refer to P 35C 277 Q Is the check result normal YES Go to Step 11 NO Replace the wheel speed sensor lt FR gt Refer to P 35C 274 Then go to Step 13 STEP 11 Connector check A 05 ASC ECU connector A 03 wheel speed sensor lt FR gt connector Q Is the check result normal YES Go to Step 12 NO Repair the de
245. nnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Disconnect C 38 G and yaw rate sensor connector 3 Turn the ignition switch to the ON position 4 Measure the voltage between the terminal No 22 and the body ground OK System voltage Q Is the check result normal YES Repair the wiring harness between A 05 ASC ECU connector terminal No 22 and C 38 G and yaw rate sensor connector terminal No 1 NO Goto Step 9 STEP 9 Wiring harness check between A 05 ASC ECU connector terminal No 22 and C 38 G and yaw rate sensor connector terminal No 1 e Short circuit check of power supply circuit Q Is the check result normal YES Go to Step 12 NO Repair the wiring harness between A 05 ASC ECU connector terminal No 22 and C 38 G and yaw rate sensor connector terminal No 1 STEP 10 Wiring harness check between A 05 ASC ECU connector terminal No 29 and C 38 G and yaw rate sensor connector terminal No 5 e Open circuit check of the ground circuit Q Is the check result normal YES Replace the G and yaw rate sensor Refer to P 35C 278 Then go to Step 11 NO Repair the wiring harness between A 05 ASC ECU connector terminal No 29 and C 38 G and yaw rate sensor connector terminal No 5 STEP 11 Check whether the DTC is reset Q Is DTC C2114 or C2115 set Y
246. normal e If the power is supplied with the ground circuit of CAN communication devices open circuited a potential abnormality may occur to the connected CAN bus line e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 TECHNICAL DESCRIPTION COMMENT When the scan tool MB991958 cannot communicate with the ABS ASC system there may be a malfunction to the CAN bus lines ASC ECU power supply circuit system ground or ASC ECU PROBABLE CAUSES Damaged wiring harness and connectors ASC ECU malfunction Wrong M U T III wiring harness Abnormality in battery or generator Abnormality in power supply voltage to ASC ECU ECU malfunction of other system DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A Using scan tool MB991958 diagnose the CAN bus lines Using the scan tool diagnose the CAN bus lines Q Is the check result normal YES Check and repair the power supply circuit system Refer to P 35C 243 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 221 DIAGNO
247. normality in FL wheel inlet valve system DTC C104F Abnormality in FR wheel inlet valve system DTC C1053 Abnormality in RL wheel inlet valve system DTC C1057 Abnormality in RR wheel inlet valve system DTC C105F Abnormality in FL wheel outlet valve system DTC C1063 Abnormality in FR wheel outlet valve system DTC C1067 Abnormality in RL wheel outlet valve system DTC C105B Abnormality in RR wheel outlet valve system DTC C1200 Abnormality in FL RR wheel cut valve system DTC C1204 Abnormality in FR RL wheel cut valve system DTC C1208 Abnormality in FL RR wheel suction valve system DTC C120C Abnormality in FR RL wheel suction valve system A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU contains the power supply circuit terminal No 32 for the solenoid valve The solenoid valve is energized by the valve relay which is incorporated in ASC ECU The valve relay in ASC ECU is energized at all times and the solenoid valve is always energized while the system is
248. not communicate only with ASC ECU With the parking brake released the brake warning light remains illuminated ABS warning light is turned off P 35C 225 The ABS warning light does not illuminate when ignition switch is turned to the ON position engine stopped P 35C 228 The brake warning light does not illuminate when ignition switch is turned to the ON position engine stopped P 35C 230 The ABS warning light remains illuminated even after the engine is started P 35C 232 The ASC warning display remains illuminated even after the engine is started P 35C 234 The ASC OFF display remains illuminated after the engine is started P 35C 237 After the ASC OFF switch is pressed to turn OFF the skid control TCL cannot be cancelled P 35C 239 Abnormality in brake operation P 35C 241 Skid control TCL does not operate P 35C 243 ASC ECU power supply circuit system P 35C 251 ABS skid control TCL operates too frequently TSB Revision P 35C 251 35C 220 SYMPTOM PROCEDURES ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Inspection Procedure 1 The scan tool cannot communicate with the ABS ASC system A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are
249. o 37 and the body ground OK No continuity Q Is the check result normal YES Goto Step 9 NO Not normal at the terminal No 36 or 37 Go to Step 7 STEP 7 Connector check A 05 ASC ECU connector C 45 intermediate connector D 18 wheel speed sensor lt RL gt connector Q Is the check result normal YES Go to Step 8 NO Repair the defective connector Then go to Step 17 STEP 8 Wiring harness check between A 05 ASC ECU connector terminal No 36 and D 18 wheel speed sensor lt RL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 37 and D 18 wheel speed sensor lt RL gt connector terminal No 2 e Short circuit check of wheel speed sensor lt RL gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt RL gt Refer to P 35C 274 Then go to Step 17 NO Repair the wiring harness Then go to Step 17 TSB Revision 35C 108 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CJ ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 9 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the
250. o to Step 17 STEP 8 Wiring harness check between A 05 ASC ECU connector terminal No 43 and D 09 wheel speed sensor lt RR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 42 and D 09 wheel speed sensor lt RR gt connector terminal No 2 e Short circuit check of wheel speed sensor lt RR gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt RR gt Refer to P 35C 274 Then go to Step 17 NO Repair the wiring harness Then go to Step 17 TSB Revision 35C 114 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CM ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 9 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor circuit power supply terminal signal terminal No 43 and the body ground OK System voltage Q Is the check result normal YES Go to Step 10 NO Goto Step 12 STEP 10 Wiring harness check between A 05 ASC ECU connector terminal No 43 and D 09 wheel speed sensor lt RR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 42 and D
251. ocedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 219 TROUBLE SYMPTOM CHART A CAUTION e ABS may operate in the following conditions without hard braking Low u road surface high speed turn and bumpy road surface When asking the customers confirm if they have encountered ABS operation in corresponding conditions M1355006900190 e Even when the ASC operation display does not appear the ASC operation noise pump motor and others may be generated This occurs because the pump motor and others operate to accu mulate the braking force before the application of braking force to wheels and it is not a malfunc tion e During ABS operation as the brake pedal is gradually drawn inward the noise is generated This occurs because the brake line pressure varies intermittently to prevent the wheel lock and it is not a malfunction A CAUTION During diagnosis a DTC associated with other system may be set when the ignition switch is turned ON with connector s disconnected On completion confirm all systems for diagnostic trouble code s If diagnostic trouble code s are set erase them all Trouble symptoms Reference page Inspection procedure number Refer to GROUP 54C Troubleshooti ng P 54C 14 P 35C 220 The scan tool cannot communicate with all systems The scan tool cannot communicate with the ABS ASC system The scan tool can
252. ohibited Prohibited Prohibited Abnormality in G and yaw rate sensor operation voltage High voltage 18 0 1 0 V or more Executed Prohibited Prohibited Prohibited Abnormality in sensor calibration Executed Prohibited Prohibited Prohibited Abnormality in steering wheel sensor signal Executed Executed Prohibited Prohibited Abnormality in steering wheel sensor initialization Steering wheel sensor neutral point not learned Executed Executed Prohibited Prohibited Internal abnormality in steering wheel sensor Trouble information data error Abnormality in valve calibration Executed Executed Prohibited Executed Executed Prohibited TSB Revision Prohibited Executed Prohibited Prohibited Executed Prohibited ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS EBD ABS Skid control TCL Bus off Executed Executed Executed Executed Engine time out error Executed Executed Executed Executed TC SST time out error Executed Executed Executed Executed Steering wheel sensor time out error Executed Executed Executed Executed ETACS time out error Executed Executed Executed Executed AWC time out error Executed Executed Executed Executed U0401 G and yaw rate sensor message time out error mes
253. ol MB991958 always turn the ignition switch to the LOCK OFF position before con necting or disconnecting scan tool MB991958 1 O ON DOA FW ND AC608435 AB Connect scan tool MB991958 to the data link connector Turn the ignition switch to the ON position Select System select Choose from 2006 MY under MODEL YEAR Check that Vehicle Information contents are correct Choose ABS ASC ASTC Select Diagnostic Trouble Code Ifa DTC is set it is shown Choose Erase DTCs to erase the DTC TSB Revision 35C 20 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DIAGNOSTIC TROUBLE CODE CHART A CAUTION M1355001100371 During diagnosis a DTC code associated with another system may be set when the ignition switch is turned on with connector s disconnected On completion confirm all systems for DTCs If DTC code s are set erase them all Item Reference page Abnormality in FL wheel speed sensor circuit P 35C 23 Abnormality in FR wheel speed sensor circuit Abnormality in RL wheel speed sensor circuit P 35C 28 P 35C 33 Abnormality in RR wheel speed sensor circuit P 35C 38 Abnormality in FL wheel speed sensor signal P 35C 43 Abnormality in FR wheel speed sensor signal P 35C 49 Abnormality in RL wheel speed sensor signal P 35C 55 Abnormality in RR wheel speed sensor signal P 35C 62 Mutual monitoring of FL whe
254. on to make ASC ECU learn the neutral point Refer to P 35C 267 Pre removal operation Post installation operation e Position the front wheels in a straight ahead direction e Paddle shift assembly installation Refer to GROUP 37 e Driver s air bag module removal Refer to GROUP 52B Steering Shaft P 37 26 lt Vehicles with paddle shift gt Driver s Air bag Module and Clock Spring P 52B 386 e Steering column upper cover and steering column lower e Steering wheel assembly removal Refer to GROUP 37 cover installation Refer to GROUP 37 Steering Shaft Steering Wheel P 37 22 P 37 26 e Steering column upper cover and steering column lower e Steering wheel assembly installation Refer to GROUP 37 cover removal Refer to GROUP 37 Steering Shaft Steering Wheel P 37 22 P 37 26 e Driver s air bag module installation Refer to GROUP 52B e Paddle shift assembly removal Refer to GROUP 37 Driver s Air bag Module and Clock Spring P 52B 386 Steering Shaft P 37 26 lt Vehicles with paddle shift gt e Performing the steering wheel calibration Refer to P 35C 267 AC707231AB Removal steps gt gt A lt lt 1 column switch assembly gt gt A lt lt 2 Steering wheel sensor TSB Revision g ACTIVE SKID CONTROL SYSTEM ASC 35C 280 STEERING WHEEL SENSOR INSTALLATION SERVICE POINT gt gt A lt lt NEUTRAL POSITIONING OF STEERING WHEEL SENSOR A CAUTION e Always align the center of the clock sp
255. onnector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the voltage between the terminal No 2 and the body ground OK System voltage Q Is the check result normal YES Go to Step 20 NO Goto Step 17 STEP 17 Measure the voltage at the C 309 ETACS ECU connector 1 Disconnect the connector and measure at the wiring harness side connector 2 Measure the voltage between the terminal No 1 and the body ground OK System voltage Q Is the check result normal YES Go to Step 18 NO Repair the wiring harness between C 309 ETACS ECU connector terminal No 1 and the fusible link No 34 STEP 18 Measure the voltage at the C 315 ETACS ECU connector 1 Without disconnecting the connector measure by backprobing 2 Measure the voltage between the terminal No 4 and the body ground OK System voltage Q Is the check result normal YES Go to Step 20 NO Go to Step 19 TSB Revision 35C 250 ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CO DIAGNOSIS STEP 19 Wiring harness check between A 05 ASC ECU connector terminal No 2 and C 315 ETACS ECU connector terminal No 4 e Check for
256. ont Wheel Alignment Check and Adjustment P 33 7 e Rear wheel alignment check Refer to GROUP 34 On vehicle Service Rear Wheel Alignment Check and Adjustment P 34 9 Q Is the check result normal YES Go to Step 5 NO Repair or replace the trouble spot Then go to Step 9 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 253 DIAGNOSIS STEP 5 Check of wheel speed sensor Check for the presence of non genuine electronic components and wiring harness of non genuine electronic components to near the wheel speed sensor wheel speed detecting section and wiring harness section Refer to P 35C 274 Q Is the check result normal YES Go to Step 6 NO Remove the non genuine electronic components and wiring harness of non genuine electronic components Then go to Step 9 STEP 6 Scan tool service data Check the following service data Refer to P 35C 255 2 Item 01 FL wheel speed sensor Item 02 FR wheel speed sensor Item 03 RL wheel speed sensor Item 04 RR wheel speed sensor Item 08 Lateral G sensor Item 10 Master cylinder pressure Item 11 Steering angle Item 12 Yaw rate sensor Item 129 FL wheel cylinder pressure Item 130 FR wheel cylinder pressure Item 131 RL wheel cylinder pressure Item 132 RR wheel cylinder pressure Is the check result normal YES Go to Step 7 NO Abnormality of items 01 to 04 Check the installation status of corresponding wheel speed sensor
257. open circuit Q Is the check result normal YES Go to Step 20 NO Repair the wiring harness STEP 20 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the terminal No 16 and the body ground as well as between the terminal No 47 and the body ground OK Continuity exists 2 Q or less Q Is the check result normal YES Go to Step 21 NO Repair the wiring harness STEP 21 Retest the system Q Is the communication with scan tool MB991958 possible YES Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 NO Check that the M U T IIl connection cable is properly connected and that the V C I switch is turned ON Then replace the hydraulic unit integrated with ASC ECU Refer to P 35C 272 Then go to Step 22 STEP 22 Retest the system Q Is the communication with scan tool MB991958 possible YES Return to Step 1 NO This diagnosis is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 251 DIAGNOSIS Inspection Procedure 12 ABS skid control TCL operates too frequently A CAUTION If there is any problem in the CAN bus lines an incor rect diagnost
258. or connector for loose corroded or damaged terminals or terminals pushed back in the connector ON VEHICLE SERVICE HYDRAULIC UNIT CHECK M1355006100138 Required Special Tools e MB991958 M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A Vehicles with CAN communication system 1 Raise the vehicle using a jack and support the specified points with a rigid rack A CAUTION Before connecting or disconnecting scan tool always turn the ignition switch to the LOCK OFF position 2 Before setting scan tool turn the ignition key to the LOCK OFF position 3 With the M T vehicles check that the shift lever is in the neutral position With the TC SST vehicle check that the selector lever is in the N position Then start the engine of the vehicle TSB Revision 35C 264 ACTIVE SKID CONTROL SYSTEM ASC ON VEHICLE SERVICE 4 When carrying out the actuator tests No 01 to 04 perform the actuator tests using scan tool while depressing the brake pedal When carrying out the actuator tests No 05 to 08 perform the actuator tests using scan tool without depressing the brake pedal When carrying out the actuator tests rotate the wheel by hands to confirm that the braking force changes NOTE e While performing the actuator test the ABS warning light flashes at a rate of 2 Hz e When ASC ECU
259. or side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3 Measure the voltage between the wheel speed sensor power supply terminal signal terminal No 45 and the body ground as well as between the ground terminal No 46 and the body ground OK 1 volt or less Q Is the check result normal YES Go to Step 6 NO Not normal at the terminal No 45 or 46 Go to Step 7 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 95 Check harness MB991 a ASC ECU A 05 ASC ECU harness connector AC400817CC DIAGNOSIS STEP 6 Resistance measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 45 and the body ground as well as between the ground terminal No 46 and the body ground OK No continuity Q Is the check result normal YES Goto Step 9 NO Not normal at the terminal No 45 or 46 Go to Step 7 STEP 7 Connector check A 05 ASC ECU connector A 11 wheel speed sensor lt FL gt connector Q Is the check result normal YES Go to Step 8 NO Repair the defective connector The
260. ormality in longitudinal G sensor output voltage Abnormality in longitudinal G sensor output signal Extinguished Extinguished Illuminated Illuminated Illuminated Illuminated Illuminated Illuminated Abnormality in G and yaw rate sensor Abnormality in lateral G sensor output value incorrect installation Extinguished Extinguished Illuminated Illuminated Abnormality in yaw rate sensor output voltage Extinguished Extinguished Illuminated Illuminated Internal abnormality in G and yaw rate sensor Abnormality in internal circuit Extinguished Illuminated Illuminated Illuminated Abnormality in lateral G sensor output voltage Extinguished Extinguished Illuminated Illuminated Abnormality in yaw rate sensor output voltage Extinguished Extinguished Illuminated Illuminated Abnormality in G and yaw rate sensor supply voltage Extinguished Illuminated Illuminated Illuminated Brake fluid pressure sensor power supply circuit Low input Extinguished Illuminated TSB Revision Illuminated Illuminated ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS Brake warning light brake warning display ABS warning light ABS warning display ASC warning display ASC OFF light Brake fluid pressure sensor power supply circuit High input Extinguished Ill
261. orporates in ASC ECU Refer to P 35C 272 Then go to Step 10 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 10 Check whether the DTC is reset Q Is DTC C123B set YES Return to Step 1 NO The procedure is complete DTC C2200 Abnormality in ASC ECU A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU controls ASC by calculating the data sent from the wheel speed sensor steering wheel sensor and G and yaw rate sensor DTC SET CONDITIONS This diagnostic trouble code is set when ASC ECU has mal function PROBABLE CAUSES ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A TSB Revision ACTIVE 35C 150 SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the C
262. orrectly NOTE A new steering wheel sensor has a lock clip for preventing the rotation of fixing the steering wheel sen sor After installing the column switch assembly remove this lock clip 3 Install the column switch assembly to the vehicle maintaining the neutral position correctly lt 4 Neutral position mark TSB Revision
263. ow is detected e Longitudinal G value output from G and yaw rate sensor is abnormal e Abnormality is detected by the self diagnosis of the longitu dinal G sensor PROBABLE CAUSES G and yaw rate sensor malfunction ASC ECU malfunction External noise interference The G and yaw rate sensor for FWD is installed DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 168 DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 Check whether the DTC is reset Q Is DTC C1210 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool service data Check the following service data Refer to P 35C 255 e Item 09 G sensor Q Is the check result normal YES Go to Step 4 NO Goto Step 5 STEP 4 Check of G and yaw rate sensor part number Q Is the check result normal YES After checking the G and yaw rate sensor perform the calibration of the G and yaw rate sensor to make ASC ECU relearn the neutral point Refer to P 35C 266 Then
264. place the front hub assembly Refer AC704652 AB to GROUP 26 Front Axle Hub Assembly P 26 9 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 15 STEP 8 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C101F set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 9 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 9 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C101F set YES Return to Step 1 NO This diagnosis is complete DTC C102A Mutual monitoring of RL wheel speed sensor LA CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve
265. r STEP 10 Check whether the DTC is reset Q Is DTC C2104 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 11 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 11 Check whether the DTC is reset Q Is DTC C2104 set YES Return to Step 1 NO This diagnosis is complete TSB Revision 35C 122 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC C1073 Faulty motor drive circuit Connector A 05 7 AC708948AB A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e ASC ECU contains the power supply circuit terminal No 1 for the motor The pump motor is energized by the pump motor switch which is incorporated in ASC ECU e The pump motor switch in ASC ECU is turned off at all times unless during the motor solenoid valve check per formed when the vehicle is started e ASC ECU activates the pump motor by turning on the ECU b
266. r 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the voltage between the terminal No 32 and the body ground OK System voltage Q Is the check result normal YES Go to Step 9 NO Repair the wiring harness between A 05 ASC ECU connector terminal No 32 and the fusible link No 27 STEP 9 Check of fuse No 17 Check that the fuse No 17 is normal and does not exceed the capacity Q Is the check result normal YES Go to Step 10 NO Replace the fuse No 17 STEP 10 Connector check C 309 ETACS ECU connector and C 315 ETACS ECU connector Q Is the check result normal YES Go to Step 11 NO Repair the defective connector STEP 11 Voltage measurement at the C 309 ETACS ECU connector 1 Disconnect the connector and measure at the wiring harness side connector 2 Measure the voltage between the terminal No 1 and the body ground OK System voltage Q Is the check result normal YES Go to Step 12 NO Repair the wiring harness between C 309 ETACS ECU connector terminal No 1 and the fusible link No 34 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 154 DIAGNOSIS STEP 12 Voltage measurement at the C 315 ETACS ECU connector 1 Without disconnecting the connector measure by bac
267. r cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section are sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 105 DTC SET CONDITIONS This diagnostic trouble code is set if any malfunction below is detected e When the brake fluid pressure is decreased for a long time e When the brake fluid pressure is held for a long time NOTE ASC controls the vehicle based on the wheel speed sig nal When the brake fluid pressure is decreased or held for an abnormally long time the wheel speed sensor signal may have a problem PROBABLE CAUSES Damaged wiring harness and connectors External noise interference Malfunction of wheel speed sensor ABS ECU malfunction Excessive gap between the wheel speed sensor and the wheel speed detection encoder Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the wheel
268. r malfunction ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 Check for diagnostic trouble codes of other systems Check if diagnostic trouble code No U0125 is also set in ASC ECU Q Is DTC U0125 set YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 202 Then go to Step 3 NO Goto Step 3 STEP 3 Check whether the DTC is reset Q Is DTC C2204 set YES Go to Step 4 NO The procedure is complete TSB Revision 35C 176 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 4 G and yaw rate sensor installation check Check that the G and yaw rate sensor is installed correctly Q Is the check result normal YES After checking the G and yaw rate sensor perform the calibration of the G and yaw rate sensor to make ASC ECU relearn the neutral point Refer to P 35C 266 Then go to Step 5 NO Reinstall the G and yaw rate sensor correctly Refer to P 35C 278 Then go to Step 7 STEP 5
269. r repairing the CAN bus line Q Is DTC C2114 or C2115 set YES Go to Step 4 NO The procedure is complete TSB Revision 35C 180 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS STEP 4 Scan tool service data Check the following service data Refer to P 35C 255 e Item 08 Lateral G sensor e Item 09 G sensor e Item 12 Yaw rate sensor Q Is the check result normal YES Go to Step 12 NO Goto Step 5 STEP 5 G and yaw rate sensor installation check Check that the G and yaw rate sensor is installed correctly Q Is the check result normal YES Go to Step 6 NO Reinstall the G and yaw rate sensor correctly Refer to P 35C 278 Then go to Step 13 STEP 6 Connector check A 05 ASC ECU connector C 38 G and yaw rate sensor connector Q Is the check result normal YES Go to Step 7 NO Repair the defective connector STEP 7 Voltage measurement at C 38 G and yaw rate sensor connector 1 Disconnect the connector 2 Turn the ignition switch to the ON position 3 Measure the voltage between the terminal No 1 and the body ground OK System voltage Q Is the check result normal YES Go to Step 10 NO Goto Step 8 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CR 35C 181 DIAGNOSIS STEP 8 Voltage measurement at A 05 ASC ECU connector 1 Disco
270. r supply the communication with scan tool becomes unavailable PROBABLE CAUSES e Damaged wiring harness and connectors e Malfunction of fuse or fusible link e Improper tightening of battery terminal e Improper tightening of grounding bolt e Battery failure e Charging system failed e ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Battery check Refer to GROUP 54A Battery Test P 54A 9 Q Is the battery in good condition YES Go to Step 3 NO Charge or replace the battery Then go to Step 2 STEP 2 Charging system check Refer to GROUP 16 Output Current Test P 16 8 Q Is the charging system in good condition YES Go to Step 3 NO Repair or replace the charging system component s STEP 3 Connector check A 05 ASC ECU connector Q Is the check result normal YES Go to Step 4 NO Repair the defective connector TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 245 STEP 4 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and measure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the volta
271. re sent to ASC ECU ASC ECU uses the fre quency of the pulse signals to determine the wheel speed DTC SET CONDITIONS ASC ECU monitors the signals from each wheel speed sensor while the vehicle is being driven If any periodical drop abnor mality is detected in the sensor signals ASC ECU sets the rel evant diagnostic trouble code PROBABLE CAUSES e Wheel bearing malfunction e Deformation of the magnetic encoder for wheel speed detection Adhesion of foreign materials on the magnetic encoder for wheel speed detection e ABS ECU malfunction e Disturbance of magnetization pattern for magnetic encoder for wheel speed detection Missing teeth of the magnetic encoder for wheel speed detection DIAGNOSIS Required Special Tools MB991958 Scan Tool M U T IIl Sub Assembly e MB991824 Vehicle Communication Interface V C I e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A MB991997 ASC check harness TSB Revision ACTIVE SKID CONTROL SYSTEM ASC Rear Wheel bearing Rear wheel nee Magnetic oy encoder AC608248AB 35C 91 DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the C
272. red always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU receives the vehicle information stored in the ETACS ECU via CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is set when the variant coding for ETACS ECU has not been completed PROBABLE CAUSES e Variant coding for ETACS ECU has not been implemented e ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 5 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 214 DIAGNOSIS STEP 2 Scan tool diagnostic trouble code for other systems Use scan tool to check that the diagnostic trouble code B222C is set in the ETACS ECU Q Is any DTC set YES Perform troubleshooting for the diagnostic trouble code that is set Then go to Step 4 NO Goto Step 3 STEP 3 Check for diagnostic trouble codes of other syst
273. resent OK Vehicles with TC SST Present ACDAYC OK Present Q Is the check result normal YES Go to Step 5 NO Replace the ETACS ECU Refer to GROUP 54A ETACS ECU P 54A 676 Then go to Step 6 STEP 5 Check whether the DTC is reset Q Is DTC C1290 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 6 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 6 Check whether the DTC is reset Q Is DTC C1290 set YES Return to Step 1 NO The procedure is complete TSB Revision 35C 162 DTC C2203 VIN not recorded ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines When another diagnostic trouble code for ASC ECU is set troubleshoot that diagnostic trouble code first Whenever the ECU is replaced ensure that the CAN bus lines are normal This diagnostic trouble code is set after ASC ECU is swapped and the ignition switch is turned ON for the first time However on and after the second time the diagnostic trouble code will not be set when ASC ECU successfully receives the normal vehicle information from the engine control module When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of
274. ring before installing the steering wheel sensor Otherwise the sensor can be damaged e Ifthe center of the clock spring is not correctly aligned the steering wheel may not be turned fully or the cable inside the clock spring may be broken causing the SRS air bag to be inoperative or operated incorrectly 1 Align the mating marks of the clock spring Window for 5 i F checking the _ lt Alignment of mating marks gt neutral point 1 Turn the clock spring clockwise fully 2 Turn the clock spring counterclockwise approximately three and 3 4 turns to align the mating marks 3 Check that the white roller is visible from the window for checking the neutral point with the mating marks being aligned NOTE If the white roller is invisible the neutral point is A CAUTION ned correctly Always align three mating marks of the steering wheel sensor simultaneously as shown in the figure If these mat ing marks are not aligned correctly the steering wheel sensor may be damaged Leeeelin 2 Align three mating marks of the steering wheel sensor simultaneously as shown in the figure lt Alignment of mating marks gt 1 Check the window for inspecting the neutral position of the steering wheel sensor If the mating marks cannot be seen from the window align the mating marks as shown Steering in the figure wheel sensor 2 Install the steering wheel sensor to the column switch assembly maintaining the neutral position c
275. rn the ignition switch to the LOCK OFF position and then disconnect scan tool TSB Revision 2 ACTIVE SKID CONTROL SYSTEM ASC 35C 266 ON VEHICLE SERVICE IN THE EVENT OF A DISCHARGED BATTERY M1355006200146 A WARNING If the ASC is not operating the vehicle will be unsta ble during braking Do not drive the vehicle with the ASC ECU connector disconnected or with the ASC not operating If the engine is started using a booster cable when the battery is completely flat and the vehicle is then driven without waiting for the battery to be recharged the engine may misfire and it may not be possible to drive the vehicle This is because the ASC consumes a large amount of current when carrying out its initial checks If this happens recharge the battery fully G AND YAW RATE SENSOR CALIBRATION M1355009300142 A CAUTION Prior to calibration check that no G and yaw rate sen sor related diagnostic trouble codes are set A CAUTION After the following procedure is complete carry out cali bration to let the ASC ECU learn the neutral position of the G and yaw rate sensor e G and yaw rate sensor replacement e ASC ECU replacement 1 Park the vehicle on a level surface 2 Turn the ignition switch to the LOCK OFF position A CAUTION Before connecting or disconnecting the scan tool turn the ignition switch to the LOCK OFF position 3 Set the scan tool with the ignition LOCK OFF 4 Turn the i
276. s OK button 10 The display should show Completed Press OK button 11 Press the OK button o N TSB Revision 35C 268 ACTIVE SKID CONTROL SYSTEM ASC ON VEHICLE SERVICE 12 The display should show SAS Calibration Do you want to start Then press the OK button NOTE Please execute after making a tire and a steering wheel straight 13 The display should show Completed Press OK button 14 Turn the ignition switch to LOCK OFF position and then turn the ignition switch ON again 15 Select the relevant system from the menu 16 Select ABS ASC ASTC WSS from the system list under System select and press OK button 17 Select Special function under ABS ASC ASTC WSS 18 Select Sensor calibration under Special function 19 Select SAS calibration under Sensor calibration and press OK button 20 The screen displays SAS calibration The selected command will be executed Are you sure Caution Confirm the execution conditions Then press OK button 21 Executed The command was executed will be shown Then press OK button 22 Select Diagnostic trouble code under ABS ASC ASTC WSS If the diagnostic trouble code C2205 SAS internal failure past trouble is set clear it 23 Learning neutral point complete 24 Turn the ignition switch to LOCK OFF position and then disconnect the scan tool MASTER CYLINDER BRAKE FLUID PRESSURE
277. s Then replace fuse No 2 STEP 14 Voltage measurement at C 304 ETACS ECU connector A CAUTION The measurement must be performed without the brake pedal depressed not operated Measure the voltage between the terminal No 1 and the body ground by backprobing OK System voltage Q Is the check result normal YES Go to Step 15 NO Replace the ETACS ECU Refer to GROUP 54A ETACS ECU P 54A 676 Then go to Step 19 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 145 DIAGNOSIS STEP 15 Voltage measurement at C 48 stoplight switch connector 1 Disconnect the connector and measure at the wiring harness side 2 Measure the voltage between the terminal No 2 and the body ground OK System voltage Q Is the check result normal YES Go to Step 16 NO An open circuit may be present in the wiring harness between C 304 ETACS ECU connector terminal No 1 and C 48 stoplight switch connector terminal No 2 Repair the wiring harness STEP 16 Voltage measurement at C 43 joint connector A CAUTION The measurement must be performed with the brake pedal depressed 1 Disconnect the connector and measure at the wiring harness side 2 Measure the voltage between the terminal No 2 and the body ground OK System voltage Q Is the check result normal YES Go to Step 17 NO An open circuit may be present in the wiring harness between C 43 joint connector termi
278. s tem is turned OFF e When the ASC OFF switch is pressed and held for 15 sec onds or more the ASC OFF indicator light is turned off and the ASC system is turned ON TECHNICAL DESCRIPTION COMMENT In the case of this trouble symptom there may be an open cir cuit to the ASC OFF switch circuit PROBABLE CAUSES e Damaged wiring harness and connectors e ASC OFF switch malfunction e ETACS ECU malfunction e Combination meter malfunction TSB Revision x ACTIVE SKID CONTROL SYSTEM ASC 35C 238 DIAGNOSIS DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 8 STEP 2 ASC OFF switch check Refer to P 35C 271 Q Is the check result normal YES Go to Step 3 NO Replace the ASC OFF switch Refer to P 35C 271 Then go to Step 8 STEP 3 Connector check C 313 ETACS ECU connector C 42 intermediate connector C 135 ASC OFF switch connector Q Is the check result normal YES Go to Step 4 NO Repair the defective connector STEP 4 Wiring harness check be
279. s lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e During the calibrations of cut valve and inlet valve do not depress the brake pedal or subject the vehicle to a vibration e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU stores the correction values of cut valve and inlet valve in the EEPROM DTC SET CONDITIONS This diagnostic trouble code is set when the calibration of the cut valve or inlet valve has not been performed or when the correction value of cut valve or inlet valve is abnormal PROBABLE CAUSES e ASC ECU malfunction e Noise interference DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 ST
280. s turned off at all times unless during the motor solenoid valve check per formed when the vehicle is started e ASC ECU activates the pump motor by turning on the ECU built in pump motor switch TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 127 DIAGNOSIS DTC SET CONDITIONS This diagnostic trouble code is set under the cases below e The power supply voltage of pump motor which is not in operation is abnormally low for a prolonged period e The voltage of pump motor which is not in operation is abnormally high for a prolonged period PROBABLE CAUSES Current trouble Fusible link malfunction Damaged wiring harness and connectors Abnormality in battery or generator ASC ECU malfunction Past trouble e Perform the diagnosis with a particular emphasis on the wir ing harness and connector failures in the ASC ECU motor power supply circuit A O5 ASC ECU connector terminal No 1 and in the ground circuit A 05 ASC ECU connector terminal No 16 and No 47 For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshooting Inspection Service Points P 00 16 DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991
281. sage error Engine malfunction detected Communication error in steering wheel sensor Executed Executed Executed Prohibited Executed Executed Prohibited Prohibited Prohibited Prohibited Prohibited Prohibited AWC time out error Local CAN Executed Executed Executed Executed Communication error in AWC Local CAN Executed Executed Executed Executed AWC signal abnormality Local CAN Executed Executed Executed Executed G and yaw rate sensor bus off Executed Prohibited Prohibited Prohibited Variant coding not completed Executed Prohibited Prohibited Prohibited NOTE Variant coding value invalid includes faulty installation Executed e 1 Prohibited when two or more wheels are faulty Prohibited e 2 Not prohibited when the ABS warning light is not illuminated e 3 Not prohibited when the brake warning light is not illuminated e 4 Only for vehicles with TC SST TSB Revision Prohibited Prohibited Data link eel MB991827 ACTIVE SKID CONTROL SYSTEM ASC 35C 19 DIAGNOSIS HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES Re quired Special Tools MB991958 Scan Tool M U T IIl Sub Assembly e MB991824 V C I e MB991827 USB Cable e MB991910 Main Harness A A CAUTION To prevent damage to scan to
282. set Q Is DTC C2205 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 4 NO The procedure is complete STEP 4 Check whether the DTC is reset Q Is DTC C2205 set YES Go to Step 1 NO The procedure is complete TSB Revision 35C 190 ACTIVE SKID CONTROL SYSTEM ASC DTC C1608 Implausible diagnosis data Connector A 05 7 AC708948AB C 130 BR AC708950 AJ DIAGNOSIS Connectors C 309 C 315 C 317 ETACS ECU gt f AC708972AS A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 When the ASC ECU connector or battery terminal is disconnected with the ignition switch ON this diagnos tic trouble code may be set When this diagnostic trouble code is set no other fail ure information will be set CIRCUIT OPERATION The ASC ECU stores diagnostic trouble
283. signal for RR wheel speed sensor FL wheel speed Executed Prohibited Prohibited Prohibited sensor control phase time exceeded FR wheel speed sensor control phase time exceeded RL wheel speed sensor control phase time exceeded RR wheel speed sensor control phase time exceeded TSB Revision Item ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS EBD ABS Skid control 35C 15 TCL Abnormality in FL wheel inlet valve system Prohibited Abnormality in FR wheel inlet valve system Abnormality in RL wheel inlet valve system Abnormality in RR wheel inlet valve system Prohibited Prohibited Prohibited Abnormality in FL wheel outlet valve system Prohibited Abnormality in FR wheel outlet valve system Abnormality in RL wheel outlet valve system Abnormality in RR wheel outlet valve system Abnormality in FL RR wheel cut valve system Prohibited Abnormality in FR RL wheel cut valve system Abnormality in FL RR wheel suction valve system Abnormality in FR RL wheel suction valve system Prohibited Prohibited Prohibited Prohibited Prohibited Prohibited Faulty valve power supply circuit Faulty motor drive circuit Abnormality in power supply voltage in pump motor Prohibited Executed Executed Prohibited Prohibited Prohibited TSB Revisio
284. sor lt FR gt connector Q Is the check result normal YES Go to Step 14 NO Repair the defective connector Then go to Step 16 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 54 DIAGNOSIS STEP 14 Wiring harness check between A 05 ASC ECU connector terminal No 34 and A 03 wheel speed sensor lt FR gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 33 and A 03 wheel speed sensor lt FR gt connector terminal No 2 e Open circuit check of wheel speed sensor lt FR gt circuit Q Is the check result normal YES Go to Step 15 NO Repair the wiring harness Then go to Step 16 STEP 15 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q Is DTC C101C set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 16 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 16 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C101C set YES Return to Step 1 NO This diagnosis is complete TSB Revision
285. ssembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1020 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool service data Check the following service data Refer to P 35C 255 e Item No 03 RL wheel speed sensor Q Is the check result normal YES Go to Step 12 NO Goto Step 4 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CH Check harness ASC ECU AC400817Cl MB991997 A 05 ASC ECU harness connector 35C 35 DIAGNOSIS STEP 4 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the wiring harness side connector and then measure at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Turn the ignition switch to the ON position 3
286. sure the resistance between the wheel speed sensor circuit power supply terminal signal terminal No 45 and the body ground as well as between the ground terminal No 46 and the body ground OK No continuity Q Is the check result normal YES Go to Step 8 NO Not normal at the terminal No 45 or 46 Go to Step 6 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 26 DIAGNOSIS STEP 6 Connector check A 05 ASC ECU connector A 11 wheel speed sensor lt FL gt connector Q Is the check result normal YES Go to Step 7 NO Repair the defective connector Then go to Step 13 STEP 7 Wiring harness check between A 05 ASC ECU connector terminal No 45 and A 11 wheel speed sensor lt FL gt connector terminal No 1 and between A 05 ASC ECU connector terminal No 46 and A 11 wheel speed sensor lt FL gt connector terminal No 2 e Short circuit check of wheel speed sensor lt FL gt circuit Q Is the check result normal YES Replace the wheel speed sensor lt FL gt Refer to P 35C 274 Then go to Step 13 NO Repair the wiring harness Then go to Step 13 STEP 8 Voltage measurement at A 05 ASC ECU connector 1 Disconnect the ASC ECU connector connect the ASC check harness Special tool MB991997 to the ASC ECU side connector and the wiring harness side connector and then measure at the special tool connector side 2 Turn the ignition switch to the ON position 3 Measure the voltage betwe
287. sure the voltage at the special tool connector side NOTE Do not connect the special tool to ASC ECU 2 Measure the resistance between the terminal No 16 and the body ground as well as between the terminal No 47 and the body ground OK Continuity exists 2 Q or less Q Is the check result normal YES Go to Step 16 NO Repair the wiring harness STEP 16 Check whether the DTC is reset Q Is DTC C2101 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 17 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 17 Check whether the DTC is reset Q Is DTC C2101 set YES Return to Step 1 NO The procedure is complete TSB Revision A ACTIVE SKID CONTROL SYSTEM ASC 35C 156 DIAGNOSIS DTC C1395 Brake fluid filling not completed A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 DTC SET CONDITIONS This diagnostic trouble code is set when the
288. tage between the terminal No 1 and the body ground OK System voltage Q Is the check result normal YES Go to Step 10 NO Goto Step 8 Check harness MB991997 ASC ECU A 05 ASC ECU harness connector AC400817CP STEP 8 Fusible link check Check the fusible link No 26 Visually check for open circuit in the fusible link No 26 Q Is the check result normal YES An open circuit may be present in the pump motor power supply circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 1 and the fusible link No 26 NO Goto Step 9 STEP 9 Wiring harness check between A 05 ASC ECU connector and fusible link No 26 1 Disconnect ASC ECU connector A 05 2 Remove fusible link No 26 3 Check the continuity short to ground between A 05 ASC ECU connector terminal No 1 and the ground OK No continuity Q Is the check result normal YES Replace the fusible link No 26 NO Short circuit may be present in the power supply circuit Repair the wiring harness between A 05 ASC ECU connector terminal No 1 and fusible link No 26 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 247 DIAGNOSIS STEP 10 Check of fuse No 17 and fusible link No 34 Visually check for open circuit in the fuse No 17 and the fusible link No 34 Q Is the check result normal YES Go to Step 16 NO Goto Step 11 STEP 11 Connector check C 41 int
289. tallation e ASC ECU replacement 1 Revise the neutral point which the steering wheel sen sor stores 2 Reset the steering angle compensation value which the ASC ECU stores A CAUTION e Prior to calibration check that no steering wheel sen sor related diagnostic trouble codes are set e If diagnostic trouble codes other than C121A have set proceed to the relevant troubleshootings 1 Place the vehicle on a level surface with its road wheels in the straight ahead position 2 Turn the ignition switch LOCK OFF position A CAUTION Before connecting or disconnecting the scan tool turn the ignition switch to the LOCK OFF position 3 Set the scan tool with the ignition at LOCK OFF 4 Turn the ignition switch ON position 5 Select the relevant system from the menu 6 Select Steering angle sensor from the system list in System select and press OK button Select Special function under Steering angle sensor Select SAS Calibration under Special function NOTE If the steering angle sensor neutral point has been learned the display will show If SAS needs re calibration execute SAS calibration after executing SAS initialization If yes press OK button 9 As SAS initialization is selected under SAS Calibration press OK button NOTE At this time if the steering angle sensor neutral point has been learned the display will show Do you want to start Note This operation will dear DTCs Then pres
290. te sensor steering wheel sensor and master cylinder pressure sensor DTC SET CONDITIONS This diagnostic trouble code is set when the calibrated value for each sensor stored in ASC ECU is abnormal e Abnormality of G and yaw rate sensor neutral position e Abnormality of steering wheel sensor neutral position e Abnormality of master cylinder pressure sensor neutral position PROBABLE CAUSES e Accidental shutdown of power supply during storing opera tion of calibrated value e ASC ECU malfunction e External noise interference TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 183 DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C123A set YES Go to Step 3 NO The procedure is complete STEP 3 Check for diagnostic trouble codes of other systems Check if the diagnostic trouble code is set related to the G and yaw rate sensor steering wheel sensor and master cylinder pressure sensor
291. te sensor outputs the signal to ASC ECU via the special CAN bus lines TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 179 DIAGNOSIS DTC SET CONDITIONS This diagnostic trouble code is set if any malfunction below is found DTC C2114 e When the power supply voltage applied from ASC ECU to the G and yaw rate sensor is not within the standard value range low DTC C2115 e When the power supply voltage applied from ASC ECU to the G and yaw rate sensor is not within the standard value range high PROBABLE CAUSES e Damaged wiring harness and connectors e Gand yaw rate sensor malfunction e ASC ECU malfunction DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 2 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 Check for diagnostic trouble codes of other systems Check if diagnostic trouble code No U0125 is also set in ASC ECU Q Is DTC U0125 set YES Perform troubleshooting for the diagnostic trouble code that is set Refer to P 35C 202 Then go to Step 3 NO Goto Step 3 STEP 3 DTC recheck afte
292. ternal noise interference Vehicle ran with the parking brake applied Only two wheels are rotated on a drum tester DIAGNOSIS Required Special Tools MB991958 Scan Tool M U T IIl Sub Assembly e MB991824 Vehicle Communication Interface V C I e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A MB991997 ASC check harness TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 70 DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Ils DTC C1014 set YES Go to Step 3 NO This diagnosis is complete STEP 3 Scan tool diagnostic trouble code Check if DTC No C100A is also set Q Is DTC C100A also set YES Carry out the diagnosis for code No C100A Refer to P 35C 23 NO Go to Step 4 STEP 4 Check of wheel speed sensor installation status Check the installation status of wheel speed sensor lt FL gt dis connection of wheel speed sensor looseness of mounting bolt etc Q Is the check result normal YES Go to Step 5 NO Reinstall the wheel speed sensor lt FL gt correctly Refer to P 35C 274 Then go to Step 9 STEP 5 Check of wheel speed sensor as a single u
293. th ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION ASC ECU receives the vehicle information stored in the ETACS ECU via CAN bus lines DTC SET CONDITIONS ASC ECU communicates with ETACS ECU via CAN bus lines This diagnostic trouble code is set when the vehicle information received from ETACS ECU is invalid This diagnostic trouble code is also set when the engine control module sends the ASC intervention rejection ASC not sup ported signal consecutively PROBABLE CAUSES e ETACS ECU malfunction e Engine ECU malfunction e ETACS ECUs have been interchanged between two vehi cles e ASC ECU malfunction e Noise interference e ASC ECUs have been interchanged between two vehicles DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A TSB Revision i ACTIVE SKID CONTROL SYSTEM ASC 35C 21 6 DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO R
294. the DTC is reset Q Is DTC U0001 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 3 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 199 STEP 3 Check whether the DTC is reset Q Is DTC U0001 set YES Return to Step 1 NO The procedure is complete DTC U0100 Engine time out error DTC U0101 TC SST time out error DTC U0126 Steering wheel sensor time out error DTC U0141 ETACS time out error DTC U0136 AWC time out error A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines If diagnostic trouble codes U0100 U0101 U0126 U0141 and U0136 are set in ASC ECU always diagnose CAN bus lines If there is any fault in the CAN bus lines an incorrect DTC may be set Whenever the ECU is replaced ensure that the CAN bus lines are normal When the steering wheel sensor is replaced always perform calibration to make ASC ECU learn the neutral point Refer to P 35C 267 When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure
295. ther DTC set YES Troubleshoot the relevant diagnostic trouble code and then go to Step 8 NO Goto Step 4 STEP 4 Connector check A 05 ASC ECU connector C 46 S AWC ECU connector C 47 intermediate connector C 50 joint connector Q Is the check result normal YES Go to Step 5 NO Repair the connector and then go to Step 8 STEP 5 Wiring harness check between A 05 ASC ECU connector terminal No 18 and C 46 S AWC ECU connector terminal No 9 between A 05 ASC ECU connector terminal No 19 and C 46 S AWC ECU connector terminal No 10 e Open or short circuit check of communication circuit Q Is the check result normal YES Go to Step 6 NO Repair the wiring harness and then go to Step 8 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 21 0 DIAGNOSIS STEP 6 Check whether the DTC is reset Q Are DTC U0251 U0440 and U0435 set YES Replace the S AWC ECU Refer to GROUP 22A Manual Transaxle S AWC ECU P 22A 132 Then go to Step 7 NO Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 7 Check whether the DTC is reset Q Are DTC U0251 U0440 and U0435 set YES Replace the hydraulic unit incorporates in ASC ECU Refer to P 35C 272 Then go to Step 8 NO The procedure is complete STEP 8 Check whether the DTC is reset Q Are DTC U0251 U0440 and U0435 set YES Return to Step 1 NO The procedure is complete D
296. ther the DTC is reset 1 Ignition switch LOCK OFF position 2 Ignition switch ON position Q Is DTC C2206 set YES Return to Step 1 NO The procedure is complete TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 167 DIAGNOSIS DTC C1210 Abnormality in G and yaw rate sensor longitudinal G sensor A CAUTION e If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines e Whenever the ECU is replaced ensure that the CAN bus lines are normal e When the steering wheel sensor is replaced always perform calibration to make ASC ECU learn the neutral point Refer to P 35C 267 e Do not drop the G and yaw rate sensor or subject it to a shock e When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 e When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION e ASC ECU supplies power to the G and yaw rate sensor at the terminal No 1 e The G and yaw rate sensor outputs the signal to ASC ECU via the special CAN bus lines DTC SET CONDITIONS This diagnostic trouble code is set if any malfunction bel
297. to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 STEP 5 Check whether the DTC is reset Q Is DTC U0100 U0101 U0126 U0141 or U0136 set YES Return to Step 1 NO The procedure is complete TSB Revision 35C 202 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC U0125 G and yaw rate sensor message time out error message error Connector A 05 7 AC708948AB AC708951AG Connectors C 46 C 47 C AC708950AN ZA CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal Do not drop the G and yaw rate sensor or subject it to a shock When the G and yaw rate sensor is replaced always perform the calibration to make ASC ECU learn the neutral point Refer to P 35C 266 When the hydraulic unit integrated with ASC ECU is replaced after turning the ignition switch ON and OFF vehicle information from ETACS ECU is registered always perform the calibration of steering wheel sen sor G and yaw rate sensor brake fluid pressure sen sor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 CIRCUIT OPERATION The G and yaw rate sensor outputs the signal to ASC ECU and S AWC ECU via the special CAN bus lines Local CAN DTC SET CONDITION
298. tput value from the steering wheel sensor with the output values from wheel speed sensor and G and yaw rate sensor PROBABLE CAUSES Improper installation of steering wheel sensor Wheel alignment not performed Steering wheel sensor malfunction Different steering wheel G and yaw rate sensor malfunction Wheel speed sensor malfunction ASC ECU malfunction External noise interference DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 STEP 2 DTC recheck after repairing the CAN bus line Q Is DTC C1219 set YES Go to Step 3 NO The procedure is complete STEP 3 Check the DTC Check if the wheel speed sensor related G and yaw rate sen sor related or steering wheel sensor related diagnostic trouble code is set Q Is any DTC set YES Troubleshoot the relevant diagnostic trouble code and then go to Step 8 NO Go to Step 4 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 186 DIAGNOSIS STEP 4 Check of steering wheel sensor installation status Check t
299. turning off the warning light according to the signal from ASC ECU ASC operation display According to the signal from ASC ECU flashes when the system is active to inform the driver of the status ASC warning display ASC OFF light ASC OFF display The TCL function and ASC function use the same display According to the signal from ASC ECU the display is illuminated to inform the driver that the system is abnormal Informs the driver of the ASC system shutdown by illuminating according to the signal from ASC ECU Using the signal from ASC ECU the display is illuminated to inform the driver that the ASC OFF switch is pressed and held for 3 seconds and that the ASC and AYC brake control is prohibited Data link connector Outputs the diagnostic trouble code and establishes the communication with the scan tool Engine ECU Controls the engine output based on the signal from ASC ECU TC SST ECU Outputs the shift position to ASC ECU S AWC ECU Outputs the drive status and brake fluid pressure request to ASC ECU ASC ECU NOTE e 1 For information on AYC Active Yaw Control refer to technical information manual Controls the actuators described above based on the signals coming from each sensors Controls the self diagnostic functions and fail safe functions Controls diagnostic function Compatible with scan tool e 2 Only for vehicles with TC SST
300. tween C 313 ETACS ECU connector terminal No 15 and C 135 ASC OFF switch connector terminal No 1 e Check the power supply circuit for open circuit Q Is the check result normal YES Go to Step 5 NO Repair the wiring harness between C 313 ETACS ECU connector terminal No 15 and C 135 ASC OFF switch connector terminal No 1 STEP 5 Wiring harness check between C 135 ASC OFF switch connector terminal No 2 and the body ground e Open circuit check of the ground circuit Q Is the check result normal YES Go to Step 6 NO Repair the wiring harness between C 135 ASC OFF switch connector terminal No 2 and the body ground TSB Revision ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS 35C 239 STEP 6 Retest the system Q Does ASC turn ON and OFF normally using the ASC OFF switch YES Intermittent malfunction Refer to GROUP 00 How to Cope with Intermittent Malfunction P 00 15 NO Replace the ETACS ECU Refer to GROUP 54A ETACS ECU P 54A 676 Then go to Step 7 STEP 7 Retest the system Q Does ASC turn ON and OFF normally using the ASC OFF switch YES The procedure is complete NO Replace the combination meter Refer to GROUP 54A Combination Meter P 54A 101 Then go to Step 8 STEP 8 Retest the system Q Does ASC turn ON and OFF normally using the ASC OFF switch YES The procedure is complete NO Return to Step 1 Inspection Procedure 9 Abnormality in brake operation
301. uilt in pump motor switch DTC SET CONDITIONS If the variation of pump motor switch voltage drop during or after the pump motor operation becomes larger than the speci fied value the pump motor operation is stopped and this diag nostic trouble code is set TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 123 DIAGNOSIS PROBABLE CAUSES Current trouble Fusible link malfunction Damaged wiring harness and connectors Abnormality in battery or generator ASC ECU malfunction Past trouble e Perform the diagnosis with a particular emphasis on the wir ing harness and connector failures in the ASC ECU motor power supply circuit A O5 ASC ECU connector terminal No 1 and in the ground circuit A 05 ASC ECU connector terminal No 16 and No 47 For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshooting Inspection Service Points P 00 16 DIAGNOSIS Required Special Tools e MB991958 Scan Tool M U T III Sub Assembly e MB991824 Vehicle Communication Interface V C 1 e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A e MB991997 ASC check harness STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repairing the CAN bus line go to Step 2 ST
302. uminated Illuminated Illuminated Abnormality in G and yaw rate sensor operation voltage Low voltage below 6 5 0 5 V Extinguished Illuminated Illuminated Illuminated Abnormality in G and yaw rate sensor operation voltage High voltage 18 0 1 0 V or more Extinguished Illuminated Illuminated Illuminated Abnormality in sensor calibration Extinguished Illuminated Illuminated Illuminated Abnormality in steering wheel sensor signal Extinguished Extinguished Illuminated Illuminated Abnormality in steering wheel sensor initialization Steering wheel sensor neutral point not learned Extinguished ABS warning light Flashes 2 Hz ABS warning display Illuminated Illuminated Illuminated Internal abnormality in steering wheel sensor Extinguished Extinguished Illuminated Illuminated Implausible diagnosis data Abnormality in valve calibration Bus off Extinguished Illuminated Extinguished Extinguished Illuminated Extinguished Extinguished Illuminated Extinguished Extinguished Illuminated Extinguished Engine time out error Extinguished Extinguished Extinguished Extinguished TC SST time out error Extinguished Extinguished Extinguished Extinguished Steering wheel sensor time out error Extinguished Extinguished Extinguished Extinguished ETA
303. unction P 00 15 STEP 6 Check whether the DTC is reset 1 Erase the diagnostic trouble code 2 Drive the vehicle at 12mph 20 km h or more NOTE The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph 20 km h or higher Q ls DTC C1043 set YES Return to Step 1 NO This diagnosis is complete TSB Revision 35C 90 ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS DTC C1044 Abnormality in periodical signal for RR wheel speed sensor A CAUTION If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 DTC SET CONDITIONS Each wheel speed detecting section is a kind of a pulse generator It consists of the encoder plate on which the north and south pole of magnet are arranged alternately for detecting the wheel speed which rotates at the same speed of the wheels and the wheel speed sensor This detecting section outputs the frequency pulse signals in proportion to the wheel speed The pulse signals generated by the wheel speed detecting section a
304. unction of wheel speed sensor Improper installation of the wheel speed sensor ABS ECU malfunction Disturbance of magnetization pattern for magnetic encoder for wheel speed detection The number of poles on the magnetic encoder for wheel speed detection the number of N pole and S pole is changed Past trouble When DTC No C1020 is also set perform the diagnosis with a particular emphasis on the wiring harness and con nector failures between ASC ECU and the wheel speed sensor For diagnosis procedures refer to How to Treat Past Trouble GROUP 00 How to Use Troubleshoot ing Inspection Service Points P 00 16 When DTC No C1020 is not set simultaneously the follow ings can be suspected Wheel s spinning Unstable vehicle attitude spin External noise interference Vehicle ran with the parking brake applied Only two wheels are rotated on a drum tester DIAGNOSIS Required Special Tools MB991958 Scan Tool M U T IIl Sub Assembly e MB991824 Vehicle Communication Interface V C I e MB991827 M U T III USB Cable e MB991910 M U T III Main Harness A MB991997 ASC check harness TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 77 DIAGNOSIS STEP 1 Using scan tool MB991958 diagnose the CAN bus lines Using scan tool MB991958 diagnose the CAN bus lines Q Is the check result normal YES Go to Step 3 NO Repair the CAN bus lines Refer to GROUP 54C Troubleshooting P 54C 14 After repair
305. voltage becomes 9 7 0 3 V or less the ABS warning light ASC warning dis play and ASC OFF display illuminate and the ABS skid control and TCL controls are prohibited If the battery terminal is not tightened properly a dump surge may occur and the power supply voltage may become abnormally high for a short period of time If there is any problem in the CAN bus lines an incor rect diagnostic trouble code may be set Prior to this diagnosis diagnose the CAN bus lines Whenever the ECU is replaced ensure that the CAN bus lines are normal When the hydraulic unit integrated with ASC ECU is replaced always perform the calibration of steering wheel sensor G and yaw rate sensor brake fluid pres sure sensor cut valve and inlet valve Refer to P 35C 266 P 35C 267 P 35C 268 and P 35C 269 TSB Revision ACTIVE SKID CONTROL SYSTEM ASC 35C 244 DIAGNOSIS SYSTEM OPERATION e ASC ECU contains the power supply circuit terminal No 32 for the solenoid valve The solenoid valve is energized by the valve relay which is incorporated in ASC ECU e ASC ECU contains the power supply circuit terminal No 1 for the pump motor The pump motor is energized by the motor relay which is incorporated in ASC ECU e ASC ECU contains the power supply circuit terminal No 2 for ASC ECU and the power is supplied from the fusible link No 34 through the multi purpose fuse No 17 e Ifa malfunction occurs in the ASC ECU powe
306. xecuted Executed Prohibited Prohibited Executed Prohibited Prohibited Executed Prohibited Prohibited Abnormality in G and yaw rate sensor Abnormality in longitudinal G sensor output signal Executed Prohibited TSB Revision Prohibited Prohibited Item ACTIVE SKID CONTROL SYSTEM ASC DIAGNOSIS EBD ABS Skid control 35C 17 TCL Abnormality in G and yaw rate sensor Internal abnormality in G and yaw rate sensor Abnormality in lateral G sensor output value Executed Executed Prohibited Prohibited Abnormality in yaw rate sensor output value Communication error Abnormality in lateral G sensor output voltage Executed Executed Executed Executed Prohibited Executed Prohibited Prohibited Prohibited Prohibited Prohibited Prohibited Abnormality in yaw rate sensor output voltage Executed Executed Prohibited Prohibited Abnormality in G and yaw rate sensor supply voltage Executed Prohibited Prohibited Prohibited Brake fluid pressure sensor power supply circuit Low input Executed Prohibited Prohibited Prohibited Brake fluid pressure sensor power supply circuit High input Executed Prohibited Prohibited Prohibited Abnormality in G and yaw rate sensor operation voltage Low voltage 6 5 0 5 V or less Executed Pr

P.35C-267 - Evo X Service Manuals

Contents

Download Pdf Manuals

Related Search

Related Contents