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2006 VA Transmission

1. 135 CHARTS AND GRAPHS 137 11 1 5 VOLT SQUARE WAVE TYPICAL PATTERN 480 485 137 1 2 TRANSMISSION TEMP SENSOR gt ese se 138 NOTES 1 0 INTRODUCTION The procedures contained in this manual include all of the specifications instructions and graphics needed to diagnose 1 Electronic Automatic Transmission and Shift Lever Assembly problems The diagnostics in this manual are based on the failure condition or symptom being present at the time of diagnosis When repairs are required refer to the appropri ate volume of the service information for the proper removal and repair procedure READ THIS MANUAL BEFORE TRYING TO DIAGNOSE VEHICLE TROUBLE CODE Diagnostic procedures change every year New diagnostic systems may be added and or carryover systems may be enhanced It is recommended that you review the entire manual to become familiar with all new and changed diagnostic procedures 1 1 SYSTEM COVERAGE This diagnostic procedures manual covers all Sprinter VA equipped with a Automatic Transmission 1 2 SIX STEP TROUBLESHOOTING PROCEDURE Diagnosis of the electronic transmission 15 done in six basic steps Verification of complaint Verification of any related symptoms Symptom analysis Problem isolation Repair of iso
2. TRANSMISSION VERIFICATION TEST 1 No Test Complete 104 TRANSMISSION NAG1 Symptom SOLENOID SUPPLY WATCHDOG When Monitored and Set Condition SOLENOID SUPPLY WATCHDOG When Monitored Always monitored with system active at each ignition cycle Set Condition During the power up of the TCM it tests the ability of the external watchdog to shut down the Solenoid Supply driver POSSIBLE CAUSES SOLENOID SUPPLY CIRCUIT SHORT TO OTHER CIRCUITS SOLENOID DTCS PRESENT TCM SOLENOID SUPPLY WATCHDOG ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmis
3. 2 eee 58 ENGINE OVERSPEED ie setee es 60 ENGINE RPM MESSAGE Liew iad 62 ENGINE TEMP MESSAGE iiec ae ma aa aaa creas 64 ENGINE TORQUE MESSAGE INCORRECT naaran 66 ENGINE TORQUE REDUCTION ta 68 IC CAN MESSAGE INCORRECT wes 70 IC ATC CAN MESSAGE MISSING 72 IMPROPER GEAR ees EARS 74 IMPROPER RATIO end us 76 INPUT SENSOR MISMATCH 78 INPUT SENSOR OVERSPEED a e E E 80 INTERNAL CONTROLLER cacera aiea ie reed 82 INVALID CONTROL MODULE VERSION 2 acd duel aw adie ws 83 MODULATING PRESSURE SOLENOID 84 2 INPUT SPEED SENSOR CIRGUIT as cued en setae 87 N3 INPUT SPEED SENSOR CIRCUIT read ames 91 SENSOR SUPPLY VOLTAGE 95 SHIFT LEVER POSITION INVALID 97 SHIFT PRESSURE SOLENOID CIRCUIT 99 SLA GAN MESSAGE oo hd be ba bend O49 bk eee 102 SOLENOID SUPPLY VOLIAGE 6 ans wiles Ore Ba eae Ps od 103 SOLENOID SUPPLY WATCHDOG sed hig oboe beng 105 SYSTEM OVERVOLIAGE 107 8 0 9 0
4. GoTo 7 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Shift Pressure Solenoid Control circuit from the TCM C2 harness connector to the Transmission Solenoid Assembly harness connector 15 the resistance above 5 0 ohms Yes Repair the Shift Pressure Solenoid Control circuit for an open Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the Shift Pressure Solenoid Control circuit 15 the resistance below 5 0 ohms Yes Repair the Shift Pressure Solenoid Control circuit for a short to ground Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Shift Pressure Solenoid Control circuit to all other circuits in the Transmission Solenoid harness connector Is the resist
5. 10 0 11 0 TABLE OF CONTENTS Continued SYSTEM UNDERVOLTAGE oe dia 109 TOG OVER TEMP eed SHS SS SPER eed neue 111 eu oe anes 112 TCC STUCK ON 115 TRANS TEMP SENSOR P N SWITCH CIRCUIT 117 TRANS TEMP SENSOR ERRATIC athe deta 120 TRANS TEMP SENSOR SHORTED ise 54544022044 ees 122 TRANSMISSION SLIPPING ade 125 VERIFICATION TESTS VERIFICATION TESIS _______ _ 127 COMPONENT esas devine nd 129 8 1 ENGINE CONTROL MODULE spans 129 8 2 TRANSMISSION CONTROL 129 8 3 TRANSMISSION SOLENOID 129 CONNECTOR PINOUTS cana 131 ELECTROBYDRAULIG CONTROL UNIT BLACK 131 SHIFTER ASSEMBLY BLACK sat os 131 TRANSMISSION CONTROL MODULE C1 BLACK 131 TRANSMISSION CONTROL MODULE C2 BLACK 132 TRANSMISSION RELAY RELAY BLOCK ues Hide dex 133 SCHEMATIC DIAGRAMS
6. Does the test light illuminate brightly Yes Replace the Shift Lever Assembly the Service Information No Repair the Backup Lamp circuit for an open SHIFT LEVER ASSEMBLY Symptom BACKUP LAMP SUPPLY CIRCUIT OPEN POSSIBLE CAUSES FUSED IGNITION SWITCH OUTPUT OPEN SHIFT LEVER ASSEMBLY ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Shift Lever Assembly harness connector Start the engine Using a 12 volt test light connected to ground check the Fused Ignition Switch Output circuit NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes Replace the Shift Lever Assembly per the Service Information No Repair the Fused Ignition Switch Output circuit for an open If the fuse is open make sure to check for a short to ground SHIFT LEVER ASSEMBLY Symptom CAN BUS CIRCUIT POSSIBLE CAUSES CAN COMMUNICATION FAILURE CAN BUS OR OPEN SHIFT LEVER ASSEMBLY ACTION APPLICABILITY With the DRBII1 read the stored and active DTCs for all modules on the CAN bus All Are other modules reporting CAN bus DTCs Yes Refer to the reporting category and perform the appropriate symptom If the ECM is reporting a CAN bus failure refer to its respective test first GoTo 2 Turn the ignition off to the lock position Disconnect the ECM harness con
7. 57 TRANSMISSION NAG1 Symptom ENGINE CAN MESSAGE MISSING When Monitored and Set Condition ENGINE CAN MESSAGE MISSING When Monitored CAN Bus circuit error not present 1 second after ignition on and not in Park or Neutral System Overvoltage or System Undervoltage conditions present transmission in Park or Neutral and engine RPM greater than 850 RPM Set Condition This DTC is set if a CAN ID was not received in the required time being sent from the Engine Controller POSSIBLE CAUSES CAN BUS CIRCUIT OPEN CAN BUS CIRCUIT DTC PRESENT ENGINE DTCS PRESENT ECM ENGINE CAN MESSAGE MISSING TCM ENGINE CAN MESSAGE MISSING ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors hav
8. ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 125 TRANSMISSION NAG1 TRANSMISSION SLIPPING Continued ACTION APPLICABILITY With the DRBIII read Transmission DTCs All Are there any Improper Gear and or Improper Ratio DTCs present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 Verify the correct axle gear r
9. Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the 2 3 Solenoid Control circuit to all other circuits in the Transmission Solenoid Assembly harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the 2 3 Solenoid Control circuit for a short to other circuits Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Note Check connectors Clean repair as necessary Measure the resistance between the 2 3 Solenoid Control circuit and the Solenoid Supply Voltage circuit in the Transmission Control Module C2 harness connector 15 the resistance between 2 5 and 6 5 ohms Yes Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 No Replace the 2 3 Solenoid per the Service Information Perform TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Techni
10. Note Check connectors Clean repair as necessary Measure the resistance of the N2 Input Speed Sensor Signal circuit from the TCM connector to the Transmission Solenoid Assembly connector Is the resistance above 5 0 ohms Yes Repair the N2 Input Speed Sensor Signal circuit for an open Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Turn the ignition off to the lock position All Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid harness connector NOTE Check connectors Clean repair as necessary Measure the resistance of the Sensor Supply Voltage circuit between the TCM connector and the Transmission Solenoid Assembly connector Is the resistance above 5 0 ohms Yes Repair the Sensor Supply Voltage circuit for an open Perform NAGI TRANSMISSION VERIFICATION TEST VER1 No GoTo 3 88 TRANSMISSION NAG1 N2 INPUT SPEED SENSOR CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM C2 harness connectors Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Sensor Ground circuit from the TCM C2 harness connector to the Transmission Solenoid Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the Sensor Ground circuit for an open Perform TRANSMISSION VERIFICATION TEST 1
11. No GoTo 6 Turn the ignition off to the lock position All Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the N2 Speed Sensor Signal circuit to all other circuits in the Transmission Solenoid harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the N2 Speed Sensor Signal circuit for a short to other circuit s Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 7 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the N2 Input Speed Sensor Signal circuit Is the resistance Below 5 0 ohms Yes Repair the N2 Input Speed Sensor Signal circuit for a short to ground Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Sensor Ground circuit to all other circuits in the Transmission Solenoid harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the Sensor Ground circuit for
12. Perform TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position Disconnect the negative battery cable Disconnect the TCM harness connectors NOTE Check connectors Clean repair as necessary Measure the resistance between the CAN Bus circuit and the Bus circuit at the TCM harness connector 15 the resistance 60 0 ohms 5 0 ohms Yes Replace the Transmission Control Module the Service Infor mation Perform TRANSMISSION VERIFICATION TEST VER 1 Repair the CAN Bus and or CAN Bus circuit for an open Perform TRANSMISSION VERIFICATION TEST VER 1 52 TRANSMISSION NAG1 Symptom CAN MESSAGE FROM ECM FROM SLA When Monitored and Set Condition CAN MESSAGE FROM ECM FROM SLA When Monitored Set Condition CAN Bus message received from the Shift Lever Assembly are incorrect POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT SHIFT LEVER DTCS PRESENT OPEN CAN BUS CIRCUITS AT SHIFT LEVER SHIFT LEVER ASSEMBLY ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagn
13. Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Solenoid Supply circuit to chassis ground in the Transmission Solenoid harness connector Is the resistance below 5 0 ohms Yes Repair the Solenoid Supply Voltage circuit for a short to ground high resistance Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Note Check connectors Clean repair as necessary Measure the resistance between all Solenoid Control circuits and chassis ground in the Transmission Control Module C2 harness connector Is the resistance below 5 0 ohms Yes Replace the Solenoid that is shorted to ground Perform TRANSMISSION VERIFICATION TEST VER 1 No Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform
14. Always monitored with system active at each ignition cycle Set Condition If the TCM detects a short to ground or battery on the solenoid control circuit shorted solenoid open solenoid or an open or shorted solenoid control circuit driver inthe TCM POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS MOD PRESS SOLENOID CONTROL CIRCUIT OPEN MOD PRESS SOLENOID CONTROL CIRCUIT SHORT TO GROUND MOD PRESS SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS MOD PRESS SOLENOID TCM MOD PRESS SOLENOID CIRCUIT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOT
15. CAUSES ABS DTCS PRESENT SOLENOID DTCS PRESENT INTERNAL TRANSMISSION TCM IMPROPER GEAR ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 74 TRANSMISSION NAG1 IMPROPER GEAR Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read Transmission DTCs Are there any Transmission Solenoid DTCs present Yes Refer to the Transmission category and perform the appropriate sympt
16. DTC ABS LR SENSOR MESSAGE reset Yes Replace the Transmission Control Module Perform NAG1 TRANSMISSION VERIFICATION TEST VER1 No Test complete Perform TRANSMISSION VERIFICATION TEST VER 1 41 TRANSMISSION NAG1 Symptom ABS RF SENSOR MESSAGE When Monitored and Set Condition ABS RF SENSOR MESSAGE When Monitored Valid ABS CAN messages received at least once and the CAN Bus circuit ABS CAN Message Missing ABS CAN Message Incorrect are not active Set Condition ABS signal Wheel Speed Front Right not valid or ABS has detected a sensor failure POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT ABS DTCS PRESENT ABS CONTROL MODULE ABS RF SENSOR MESSAGE TCM ABS RF SENSOR MESSAGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but som
17. GoTo 2 80 TRANSMISSION NAG1 INPUT SENSOR OVERSPEED Continued ACTION APPLICABILITY Ignition on engine not running With the DRBIII erase Transmission DTCs Raise the vehicle on the hoist Start the engine NOTE This condition indicates a catastrophic transmission failure With the DRBIII in Sensors monitor the N2 and Speed Sensors Firmly apply the brakes and place the gear selector in Drive D Release the brakes and raise the engine RPM to allow the Transmission to upshift to the 2 3 and 3 4 shift schedule CAUTION BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS Did either the N2 or N3 Speed Sensors display a RPM above 7700 Yes GoTo 3 No GoTo 5 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Test Complete Remove the Transmission Oil Pan and inspect for debris or a plugged Transmission All Oil Filter Is there any debris plugged Transmission Oil Filt
18. IGNITION SWITCH OUTPUT RUN START 87 16RD FUSED 87A 133 N N E R 4 2 7 NOTES 134 TRANSMISSION SOLENOID ASSEMBLY N2 AND N3 SPEED SENSORS TRANSMISSION TEMPERATURE SENSOR SWITCH OPEN IN PARK AND NEUTRAL TRANSMISSION RELAY OUTPUT 10 0 SCHEMATIC DIAGRAMS TRANSMISSION CONTROL MODULE CAN BUS CAN BUS SENSOR SUPPLY VOLTAGE N2 INPUT SPEED SENSOR N3 INPUT SPEED SENSOR SENSOR GROUND TEMP SENSOR P N SWITCH 1 2 4 5 SOLENOID CONTROL 2 3 SOLENOID CONTROL 3 4 SOLENOID CONTROL TCC SOLENOID CONTROL MODULATION PRESSURE SOLENOID CONTROL SHIFT PRESSURE SOLENOID CONTROL SOLENOID SUPPLY VOLTAGE SCHEMATIC DIAGRAMS TO DLC TO OTHER MODULES ENGINE CONTROL MODULE 1 C212 CAN BUS i 1 3 120 OHM 2 11 CAN BUS 1 ee _ SKREEM eee ee 1 5 CAN BUS 3 120 K SKREEM 2 H DLC 6 CAN BUS 1 i Ne cea 2 ABS K ABS SHIFTER 11 TO DLC ASSEMBLY N CAN BUS f CAN BUS 1 K ABS SHIFTER ASSEMBLY FUSED IGNITION SWITCH OUTPUT RUN START i BRAKE SWITCH SENSE 5 TO BRAKE LAMP SWITCH 1 BACK UP LAMP TO BACK UP
19. MODULE TRANSMISSION CONTROL MODULE 48 TRANSMISSION NAG1 CAN BUS CIRCUIT Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII read the active and stored DTCs for all modules that use CAN Bus communication NOTE Due to capabilities of certain controllers that use the CAN Bus not all modules report CAN Bus DTCs NOTE If a total CAN Bus failure transpires there will be multiple CAN Bus
20. N Switch circuit to all other circuits in the TCM C1 and C2 harness connectors Is the resistance below 5 0 ohms between any other circuit Yes Repair the Temp Sensor P N Switch circuit for a short to other circuits Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 123 TRANSMISSION NAG1 TRANS TEMP SENSOR SHORTED Continued ACTION APPLICABILITY If there are no possible causes remaining view repair All Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 124 TRANSMISSION NAG1 Symptom TRANSMISSION SLIPPING When Monitored and Set Condition TRANSMISSION SLIPPING When Monitored Enginerpm greater than 450 rpm output speed greater than 180 rpm no 2 input speed sensor errors present no gear selector lever errors present 5 system errors no transfer case errors present and all wheel speeds between 70 380 rom with no wheel slip detected Set Condition Calculated ratio not within allowable range for the engaged gear No shifting operation Set Condition The TCM constantly calculates the transmission ratio based on the N2 N3 input speed signals and the calculated output shaft speed CAN message from the ABS The TCM will detect if the transmission is slipping an invalid gear ratiois present POSSIBLE CAUSES OTHER DTCS PRESENT AXLE MECHANICAL GEAR RATIO INTERNAL TRANSMISSION TCM TRANSMISSION SLIPPING
21. Note Check connectors Clean repair as necessary Measure the resistance of the Mod Press Solenoid Control circuit to all other circuits in the Transmission Solenoid Assembly harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the Mod Press Solenoid Control circuit for short to other circuits Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position All Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary 85 TRANSMISSION NAG1 MODULATING PRESSURE SOLENOID CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Transmission Control Module C2 harness connector Note Check connectors Clean repair as necessary Measure the resistance between the Mod Press Solenoid Control circuit and the Solenoid Supply Voltage circuit in the Transmission Control Module C2 harness connector Is the resistance between 4 0 and 8 0 ohms Yes Replace the Transmission Control Module Perform NAGI TRANSMISSION VERIFICATION TEST VER1 No Replace the Mod Press Solenoid per the Service Information Perform NAG1 TRANSMISSION VERIFICATION TEST 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspec
22. SENSOR SUPPLY VOLTAGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs 15 the DTC Sensor Supply Voltage displayed as ACTIVE Yes GoTo 3 No GoTo 5 95 TRANSMISSION NAG1 SENSOR SUPPLY VOLTAGE Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Transmission Solenoid Assembly harness conne
23. SIGNAL CIRCUIT SHORT TO OTHER CIRCUIT SENSOR GROUND CIRCUIT OPEN SENSOR GROUND CIRCUIT SHORT TO OTHER CIRCUIT N3 INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND SENSOR GROUND CIRCUIT SHORT TO GROUND N3 INPUT SPEED SENSOR INPUT SPEED SENSOR 91 TRANSMISSION NAG1 N3 INPUT SPEED SENSOR CIRCUIT Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII read DTCs NOTE The vehicle
24. Scope Pattern on the DRBIII with a typical 5 volt square wave pattern Does the scope pattern match a typical 5 volt square wave Signal Scope Pattern Yes GoTo 1 No Replace the Input Speed Sensor Perform TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were any problems found Yes Repair as necessary Perform TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 94 TRANSMISSION NAG1 Symptom SENSOR SUPPLY VOLTAGE When Monitored and Set Condition SENSOR SUPPLY VOLTAGE When Monitored Always monitored with system active at each ignition cycle and no under voltage condition exists Set Condition If measured sensor voltage is not within specified limits 4 8 7 2 volts or if a Faulty regulator Sensor Supply Voltage shorted to ground Sensor Supply Voltage shorted to battery is detected POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS SENSOR SUPPLY CIRCUIT SHORT TO OTHER CIRCUIT SENSOR SUPPLY VOLTAGE CIRCUIT SHORT TO GROUND TCM
25. Solenoid Control circuit and the Solenoid Supply Voltage Circuit in the Transmission Control Module C2 harness connector 15 the resistance between 2 5 and 6 5 ohms Yes Replace the Transmission Control Module Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Replace the 1 2 4 5 Solenoid per the Service Information Perform TRANSMISSION VERIFICATION TEST 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 26 TRANSMISSION NAG1 Symptom List 2 3 SOLENOID CIRCUIT 2 3 SOLENOID CIRCUIT SHORT TO GROUND Test Note All symptoms listed above are diagnosed using the same tests The title for the tests will be 2 3 SOLENOID CIRCUIT When Monitored and Set Condition 2 3 SOLENOID CIRCUIT When Monitored Always monitored with system active at each ignition cycle Set Condition If the TCM detects a short to ground or battery on the solenoid control circuit shorted solenoid open solenoid or an open or shorted solenoid control circuit driver inthe TCM 2 3 SOLENOID CIRCUIT SHORT TO GROUND When Monitored Always monitored wi
26. This command should be used after the vehicle has been test driven by the tech nician to store any learned adaptive changes that occurred during the test drive During normal op eration adaptive are updated every 10 minutes Using this command the latest adaptive will be written to the TCM immediately 3 3 DIAGNOSTIC TROUBLE CODES Diagnostic trouble codes 5 are codes stored by the Transmission Control Module and the Shift Lever Assembly Module SLA to help diag nose Transmission and Shifter problems They are viewed using the DRBIII scan tool Always begin by performing a visual inspection of the wiring connectors cooler lines and the trans mission Any obvious wiring problems or leaks should be repaired prior to performing any diagnos tic test procedures Some engine driveability prob lems can be misinterpreted as a transmission prob lem Ensure that the engine is running properly and that no are present that could cause a transmission complaint If there is a communication K ABS Shifter K TCM circuit problem trouble codes will not be accessible until the problem is fixed The 2 will display an appropriate message The following is a possible list of causes for a bus problem open or short to ground battery in K line circuit internal failure of any module or component connected to the K line circuit Each diagnostic trouble code is diagnosed by following a specifi
27. VERIFICATION TEST VER 1 67 TRANSMISSION NAG1 Symptom ENGINE TORQUE REDUCTION When Monitored and Set Condition ENGINE TORQUE REDUCTION When Monitored Engine intervention active for at least 20 ms no engine torque errors engine torque demand is greater than 0 Set Condition Torque Reduction acknowledge bit not set no shift aborts the error flag torque reduction acknowledge is not set Engine controller not supporting torque requests POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT CAN C BUS CIRCUIT OPEN ENGINE DTCS PRESENT PCM ECM ENGINE CAN MESSAGE MISSING TCM ENGINE CAN MESSAGE MISSING ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify fl
28. a short to other circuits Perform TRANSMISSION VERIFICATION TEST 1 GoTo 9 89 TRANSMISSION NAG1 N2 INPUT SPEED SENSOR CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM C2 harness connectors Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the Sensor Ground circuit 15 the resistance Below 5 0 ohms Yes Repair the Sensor Ground circuit for a short to ground Perform TRANSMISSION VERIFICATION TEST VER 1 No GoTo 10 Turn the ignition off to the lock position All With the DRBIII PEP Module being used as a Dual Channel Lab Scope with Miller Special tool 6801 Backprobe N2 Input Speed Sensor Signal using Channel 1 at the TCM harness connector Raise all drive wheels off the ground CAUTION Properly support vehicle Start the engine Place gear selector in drive and increase vehicle speed to engage 2nd gear CAUTION BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS Compare the Scope Pattern on the DRBIII with a typical 5 volt square wave pattern Does the scope pattern match a typical 5 volt square wave Signal Scope Pattern Yes GoTo 1 No Replace the 2 Input Speed Sensor Perform TRANSMISSION VERIFICATION TEST VER 1 If there are possible causes remaining view repai
29. and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST 1 GoTo 4 Turn the ignition off to the lock position Replace and program the ECM per the Service Information With the DRBIII erase Transmission DTCs Start the engine With the brakes firmly applied shift the gear selector into drive With the DRBIII read Transmission DTCs Did the DTC ENGINE RPM MESSAGE reset Yes Replace the Transmission Control Module Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 No Test Complete Perform TRANSMISSION VERIFICATION TEST VER 1 63 TRANSMISSION NAG1 Symptom ENGINE TEMP MESSAGE When Monitored and Set Condition ENGINE TEMP MESSAGE When Monitored Valid Engine Temp CAN message received at least once and CAN Bus Circuit error Engine CAN Message Missing and Engine CAN Messages Incorrect are not active Set Condition Engine coolant temperature signal is not valid indicates possible coolant temperature sensor error POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT ENGINE DTCS PRESENT ECM ENGINE TEMP MESSAGE TCM ENGINE TEMP MESSAGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With
30. are located on the valve body and report DTC s for the input speed sensors errors The speed sensors are Hall Effect speed sensors that are used by the tocalculate the transmissions input speed Since the input speed could not be measured directly two of the drive elements are measured Two input speed sensors were required because both drive elements are not activein all gears Theinput sensors N2 N3 will report the same input speed in gears 2nd 3rd or 4th If the N2 and input speed signals not the same in these gears then there is an issue with the transmission and the DTC Input Sensors Mismatch will be set The input speed is not reported inlst and 5th gears The N2 sensor is not reported in Reverse The Input Speed Sensor Overspeed is a rationality check that is intended to indicate a major transmis sion failure and will cause a loss of drive place the transmission in Neutral Output Speed Sensor ABS signal The transmission does not have an output shaft speed sensor The TCM uses the ABS An tilock Brake System Wheel Speed sensor informa tion it receives over the CAN bus to calculate the transmissions output shaft speed The TCM moni tors the ABS system for functionality and reports ABS speed sensor and communication DTCs which will affect proper transmission operation GENERAL INFORMATION 3 2 5 TRANSMISSION OPERATION AND SHIFT SCHEDULING The transmission covered in this ma
31. circuit for a short to other circuits Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Note Check connectors Clean repair as necessary Measure the resistance between the TCC Solenoid Control circuit and the Solenoid Supply Voltage circuit in the Transmission Control Module C2 harness connector 15 the resistance between 2 0 and 4 0 ohms Yes Replace the Transmission Control Module Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 No Replace the TCC Solenoid per the Service Information Perform TRANSMISSION VERIFICATION TEST 1 113 TRANSMISSION NAG1 TCC SOLENOID CIRCUIT Continued ACTION APPLICABILITY The conditions necessary to set this DTC are not present at this time All Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 114 TRANSMISSION NAG1 Symptom TCC STUCK ON When Monitored and Set Condition TCC STUCK ON When Monitored No Input Speed Sensor 2 CAN Bus PCM ECM CAN Engine Engine Torque and or Shift in progres
32. circuit from the TCM C2 harness connector to the Transmission Solenoid Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the 3 4 Solenoid Control circuit an open Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the 3 4 Solenoid Control circuit 15 the resistance below 5 0 ohms Yes Repair the 3 4 Solenoid Control circuit for a short to ground Perform TRANSMISSION VERIFICATION TEST 1 GoTo 5 31 TRANSMISSION NAG1 3 4 SOLENOID CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the 3 4 Solenoid Control circuit between all other circuits in the Transmission Solenoid harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the 3 4 Solenoid Control circuit for a short to other circuits Perform TRANSMISSION VERIFICATION TEST 1 GoTo 6 Turn the ignition off to the l
33. code is erased Stored Intermittent DTCs can be reset by cy cling the ignition switch 3 3 3 TROUBLE CODE ERASURE Diagnostic Trouble Codes can be erased in two ways The first is to erase the DTC with the DRBII or scan tool The second is if the DTC is no longer present the DTC is reset by the TCM after an ignition cycle which will place the DTC in an intermittent status Stored DTC When there are no diagnostic trouble codes stored in memory the DRBIII will display NO DTC s DETECTED 3 4 USING THE DRBIII Refer to the 2 user s guide instructions and assistance with reading trouble codes erasing trouble codes and other DRBIII functions GENERAL INFORMATION DISPLAY DRB m REPLACEABLE LENS ws ENTER KEYS LEDs CONTRAST with YES key ODO BACK LIGHTING Oo with YES key Doe KEYPAD SHIFT KEY LED 80b57566 3 5 DRBIII ERROR MESSAGES Under normal operation the DRBIII will display one of only two error messages User Requested WARM Boot User Requested COLD Boot If the DRBIII should display any other error message record the entire display and call the S T A R Center 3 5 1 DRBIII DOES NOT POWER UP BLANK SCREEN If the LE D s do not light no sound is emitted at start up check for loose cable connections or a bad cable Check the vehicle battery voltage A mini mum of 11 volts is required to adequately po
34. cu che chat ees Sees __ Bens 6 4 2 1 TECHNICIAN SAFETY 6 4 2 2 VEHICLE PREPARATION 6 4 2 3 SERVICING SUB ASSEMBLIES keno sens 6 42 4 DRBIII SAFETY INFORMATION 6 43 WARNINGS ws 7 431 VEHICLE DAMAGE 85 7 4 3 2 ROAD TESTING A COMPLAINT _ 7 444 BULLETINS AND RECALLS 22 7 REQUIRED TOOLS AND EQUIPMENT cece eee eee eee eee 8 GLOSSARY OF TERMS 8 6 1 8 6 2 DEFINITIONS neri 8 DIAGNOSTIC INFORMATION AND 85 9 COMMUNICATION RESPONSE FROM SHIFTER ASSEMBLY 10 RESPONSE FROM TRANSMISSION CONTROL MODULE 12 SHIFT LEVER ASSEMBLY BACKUP LAMP CKT SHORT TO GROUND news 14 TABLE OF CONTENTS Continued BACKUP LAMP CKT SHORT TO VOLTAGE OR OPEN 15 BACKUP LAMP SUPPLY CIRCUIT OPEN 16 CAN BUS GIRGUIT reperi 17 INCORRECT CAN MESSAGE 18 INTERNAL CONTROLLER c croi tee ani deco ede 1
35. diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 36 TRANSMISSION NAG1 ABS CAN MESSAGE MISSING Continued ACTION APPLICABILITY Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 Ignition on engine not running With the DRBIII read ABS DTCs Are there any performance or bus related ABS DTCs present Yes Repair all ABS DTCs before proceeding Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 and the TCM C2 harness connector 15 the resistance above 5 0 ohms on either circuit Yes Repair the CAN BUS or circuit for an open Perform TRANSMISSION VERIFICATION TEST 1 GoTo 5 Replace and program the ABS Control Module With the DRBIII erase Transmission DTCs Start the engine With the brakes firmly applied shift the gear selector into drive With the DRBIII read Transmission DTCs Did the DTC ABS
36. engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Turn the ignition off to the lock position Replace the ABS Control Module per the Service Information Ignition on engine not running With the DRBIII erase Transmission DTCs Start the engine and with the brakes firmly applied place the gear selector into Drive With the DRBIII read Transmission DTCs Did the DTC ABS CAN MESSAGES INCORRECT reset Yes Replace the Transmission Control Module Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Test complete Perform TRANSMISSION VERIFICATION TEST VER 1 35 TRANSMISSION NAG1 Symptom ABS CAN MESSAGE MISSING When Monitored and Set Condition ABS CAN MESSAGE MISSING When Monitored CAN Bus Circuit error not present 1 second after igniti
37. must be driven to at least 32 Km h 20 MPH for this DTC to be displayed as active Is the Warm up counter displayed and equal to 0 Yes GoTo 4 GoTo 12 Turn the ignition switch to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the N3 Input Speed Sensor Signal circuit from the TCM connector to the Transmission Solenoid Assembly connector Is the resistance above 5 0 ohms Yes Repair the Input Speed Sensor Signal circuit for an open Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Turn the ignition off to the lock position All Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid harness connector NOTE Check connectors Clean repair as necessary Measure the resistance of the Sensor Supply Voltage circuit between the TCM connector and the Transmission Solenoid Assembly connector Is the resistance above 5 0 ohms Yes Repair the Sensor Supply Voltage circuit for an open Perform NAGI TRANSMISSION VERIFICATION TEST VER1 No GoTo 3 92 TRANSMISSION NAG1 N3 INPUT SPEED SENSOR CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connector
38. off Disconnect the Shifter Assembly harness connector Disconnect the DRBIII from the DLC Measure the resistance of the K ABS Shifter Assembly circuit between the Shifter Assembly connector and the DLC Is the resistance below 5 0 ohms Yes Replace the Shifter Assembly in accordance with the Service Information Perform TRANSMISSION VERIFICATION TEST VER 1 Repair the K ABS Shifter Assembly circuit for an open Perform TRANSMISSION VERIFICATION TEST VER 1 COMMUNICATION Symptom NO RESPONSE FROM TRANSMISSION CONTROL MODULE POSSIBLE CAUSES CHECK POWERS AND GROUNDS TO THE TRANSMISSION CONTROL MODULE K TCM CIRCUIT SHORTED TO GROUND K TCM CIRCUIT SHORTED TO VOLTAGE K TCM CIRCUIT OPEN TRANSMISSION CONTROL MODULE ACTION APPLICABILITY Turn the ignition off All Disconnect the Transmission Control Module harness connectors Check each power and ground circuit to the module Were any problems found Yes Refer tothe wiring diagrams located in the service information to help isolate an open or shorted condition Repair as necessary Perform TRANSMISSION VERIFICATION TEST 1 GoTo 2 Turn the ignition off Disconnect the TCM harness connectors Disconnect the DRBIII from the DLC Measure the resistance between ground and the K TCM circuit Is the resistance below 5 0 ohms Yes Repair the K TCM circuit for a short to ground Perform TRANSMISSION VERIFICAT
39. record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Engine DTCs Are there any performance or bus related Engine DTCs present Yes Refer to the Powertrain category and perform the appropriate symptom GoTo 3 66 TRANSMISSION NAG1 ENGINE TORQUE MESSAGE INCORRECT Continued ACTION APPLICABILITY Replace and program the ECM per the Service Information All With the DRBIII erase Transmission DTCs Drive the vehicle performing multiple aggressive upshifts and downshifts With the DRBIII read Transmission DTCs Did the DTC ENGINE TORQUE MESSAGE INCORRECT reset Yes GoTo 4 No Test Complete Perform TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module Perform TRANSMISSION
40. the following steps turn the ignition off and WAIT ONE MINUTE before disconnecting any module Repeat this for all mod ules failure to turn off ignition may result in damaging the disconnected module Turn the ignition on Disconnect a CAN Bus module the vehicle is equipped with Monitor and note the voltmeter reading NOTE Repeat the above step for each CAN Bus module until all the modules have been disconnected NOTE Refer to the wiring diagrams in the service information to help determine which modules are on the CAN Bus Is the voltage steadily above 3 0 volts with all the modules disconnected Yes Repair theCAN Bus circuit and or the CAN Bus circuit for a short to voltage Perform NAG1 TRANSMISSION VERIFICATION TEST VER1 Replace the module that when disconnected the short to voltage was eliminated Perform TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off Disconnect the negative battery cable While back probing measure the resistance between ground and the CAN C Bus circuit While back probing measure the resistance between ground and the CAN C Bus circuit 15 the resistance below 50 0 ohms for either measurement Yes GoTo 7 GoTo 8 50 TRANSMISSION NAG1 CAN BUS CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off All Disconnect the negative battery cable Using an ohmmeter connect one end to the CAN Bus circuit that previ
41. to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 44 TRANSMISSION NAG1 ABS RR SENSOR MESSAGE Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read ABS DTCs Are there any ABS DTCs present Yes Refer to the BRAKE category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position Replace the ABS Control Module per the Service Information With the DRBIII erase Transmission DTCs Road test the Vehicle With the DRBIII read Transmission DTCs Does the DTC ABS RR SENSOR MESSAGE reset Yes Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER1 No Test complete Perform TRANSMISSION VERIFICATION TEST VER 1 45 TRANSMISSION NAG1 Symptom ACCEL PEDAL SENSOR CAN MESSAGE INCORRECT When Monitored and Set Condition ACCEL PEDAL SENSOR C
42. 1 0 2 0 3 0 4 0 5 0 6 0 7 0 TABLE OF CONTENTS INTRODUCTION sete a wee 1 11 SYSTEM COVERAGE an 1 1 2 SIX STEP TROUBLESHOOTING PROCEDURE 1 IDENTIFICATION OF SYSTEM osc oven creeds ren a a a 1 SYSTEM DESCRIPTION AND FUNCTIONAL 1 3 1 GENERAL DESCRIPTION 1 3 2 FUNCTIONAL OPERATION 1 321 CONTROLLER MODES OF OPERATION 2 3 2 2 MIL ILLUMINATION Sade 2 3 SOLENOIDS serenana ma eana 2 3 24 TRANSMISSION COMPONENT DESCRIPTIONS 3 3 2 5 TRANSMISSION OPERATION AND SHIFT SCHEDULING 4 3 2 6 TRANSMISSION ADAPTIVES INITIALIZE AND STORE 4 3 3 DIAGNOSTIC TROUBLE CODES ered 4 3 3 1 ACTIVE HARDYCODE bent 4 3 32 STORED INTERMITTENT CODE 4 3 3 3 TROUBLE CODE ERASURE 5 34 USING THE DRBIN gt 5 3 5 DAB ERROR MESSAGES doar doe ns 5 351 DOES NOT POWER UP BLANK 5 5 3 5 2 DISPLAY IS NOT VISIBLE hoe 5 DISCLAIMERS SAFETY AND WARNINGS 5 4 1 DISCLAIMERS ei 0204 ae bbe 5 42 SAFE Y
43. 1 harness connector Start the engine Increase the Engine Speed to 1500 RPM Measure the voltage of the Transmission Relay Output circuit in the TCM C1 harness connector Is the voltage below 9 0 volts Yes Repair the Transmission Relay Output circuit for an open or high resistance Perform TRANSMISSION VERIFICATION TEST VER 1 Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 110 TRANSMISSION NAG1 Symptom TCC OVER TEMP When Monitored and Set Condition TCC OVER TEMP When Monitored Solenoid supply active Input Speed Sensor N2 CAN Bus PCM ECM CAN Engine CAN Engine Speed DTCs present Torque Converter Clutch in slip mode Set Condition Friction loss factor reaches threshold POSSIBLE CAUSES INTERNAL TRANSMISSION ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schemat
44. 9 LR WHEEL SPIN CAN MESSAGE NOT 20 65 ee gt hse oud ee bh oe okie ee 21 RR WHEEL SPIN CAN MESSAGE 22 UNDER VOLTAGE 23 TRANSMISSION 1 2 4 5 SOLENOID CIRCUIT nace ee ea Res 24 1 2 4 5 SOLENOID CIRCUIT SHORT TO GROUND ce oe 24 2 3 SOLENOID CIRCUIT 27 2 3 SOLENOID CIRCUIT SHORT TO GROUND oe eases 27 3 4 SOLENOID CIRCUIT 30 3 4 SOLENOID CIRCUIT SHORT TO GROUND 30 ABS BRAKE MESSAGE 33 ABS CAN MESSAGE INCORRECT 35 ABS MESSAGE MISSING 36 ABS LP SENSOR MESSAGE be pees hou weed oe hee ee 38 ABS LR SENSOR MESSAGE 40 ABS SENSOR MESSAGE 6404449 thee see eee oe 42 ABS SENSOR MESSAGE 44 ACCEL PEDAL SENSOR CAN MESSAGE INCORRECT 46 48 GAN MESSAGE FROM FROM SUA 53 CONTROL MODULE TCM IS NOT CODED eens 55 ENGINE CAN MESSAGE INCORRECT 56 ENGINE CAN MESSAGE MISSING
45. ABS BRAKE MESSAGE Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read ABS DTCs Are there any ABS or bus related DTCs present Yes Repair all ABS DTCS before proceeding Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 No GoTo 4 Replace and program the ABS Control Module With the DRBIII erase Transmission DTCs Start the engine With the brakes firmly applied shift the gear selector into drive With the DRBIII read Transmission DTCs Did the DTC ABS BRAKE MESSAGE reset Yes Replace the Transmission Control Module Perform NAGI TRANSMISSION VERIFICATION TEST VER1 No Test Complete Perform 5 1551 VERIFICATION TEST VER 1 34 TRANSMISSION NAG1 Symptom ABS CAN MESSAGE INCORRECT When Monitored and Set Condition ABS CAN MESSAGE INCORRECT When Monitored ABS CAN messages received at least once and CAN Bus Circuit 37 is not active Set Condition DTC Detected if the number of bytes incorrect for CAN ID POSSIBLE CAUSES ABS INTERNAL TCM INTERNAL ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all
46. AN EXPOSE YOU TO SERIOUS OR POSSIBLY FATAL INJURY CAREFULLY READ AND UNDERSTAND THE CAUTIONS AND THE SPECIFICATION LIMITS Follow the vehicle manufacturer s service speci fications at all times Do not use the DRBIII if it has been damaged Do not use the test leads if the insulation is damaged or if metal is exposed e To avoid electrical shock do not touch the test leads tips or the circuit being tested Choose the proper range and function for the measurement Do not try voltage or current mea surements that may exceed the rated capacity e Do not exceed the limits shown in the table FUNCTION INPUT LIMIT Volts 0 500 volts peak AC 0 500 volts DC Ohms resistance 0 1 12 megohms Frequency measured 0 10 khz Frequency generated Temperature 58 1100 F 50 600C Ohms cannot be measured if voltage is present Ohms can be measured only in a non powered circuit Voltage between any terminal and ground must not exceed 500v DC or 500v peak AC e Use caution when measured voltage above 25v DC or 25v AC The circuit being tested must be protected by a 10A fuse or circuit breaker e Usethe low current shunt to measure circuits up to 10A Use the high current clamp to measure circuits exceeding 10A e When testing for the presence of voltage or cur rent make sure the meter is functioning cor rectly Take a reading of a known voltage or current before accepting a zero reading e When measur
47. AN MESSAGE INCORRECT When Monitored When valid Accelerator Pedal Position APP CAN Message Received at least once and the DTCs CAN Bus Circuit Engine CAN Message Missing and Engine CAN Message Incorrect are not active Set Condition Accelerator Pedal Position APP Message not valid or a ECM Engine Sensor DTC detected POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT ENGINE ACCEL PEDAL DTCS PRESENT ENGINE COMMUNICATION DTCS PRESENT INTERMITTENT WIRING AND CONNECTORS ECM ACCEL PEDAL SENSOR CAN MESSAGE INCORRECT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controll
48. ANSMISSION RELAY OUTPUT HIGH AT TCM TCM SYSTEM OVERVOLTAGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Determine is the vehicle was jump started improperly NOTE If the battery was jump started with the batteries in series the System Overvoltage DTC will be set Was the vehicle jump started improperly Yes Erase the DTC if the vehicle was jump started improperly Perform TRANSMISSION VERIFICATION TEST V
49. ANSMISSION VERIFICATION TEST VER 1 43 TRANSMISSION NAG1 Symptom ABS RR SENSOR MESSAGE When Monitored and Set Condition ABS RR SENSOR MESSAGE When Monitored Valid ABS CAN messages received at least once and the CAN Bus circuit ABS CAN Message Missing ABS CAN Message Incorrect are not active Set Condition ABS signal wheel speed rear right not valid or ABS has detected a sensor failure POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT ABS DTCS PRESENT ABS CONTROL MODULE ABS RR SENSOR MESSAGE TCM ABS RR SENSOR MESSAGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades
50. ATION TEST VER 1 GoTo 4 NOTE The Engine and Transmission must not have mechanical problems and be operating normally before proceeding with this test Turn the ignition off to the lock position Replace and program the PCM ECM Control Module per the Service Information With the erase Transmission DTCs Road test the Vehicle With the read Transmission DTCs Does the DTC ENGINE OVERSPEED reset Yes GoTo 5 No Replacing the ECM has corrected the problem Perform the Powertrain Verification test Perform NAG1 TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Replace the TCM Perform TRANSMISSION VERIFICATION TEST VER 1 61 TRANSMISSION NAG1 Symptom ENGINE RPM MESSAGE When Monitored and Set Condition ENGINE RPM MESSAGE When Monitored Valid TPS CAN message received at least once CAN Bus Circuit Engine CAN Message Missing and Engine CAN Message Incorrect not active Set Condition Signal engine speed not valid PCM ECM error POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT ENGINE DTCS PRESENT ECM ENGINE RPM MESSAGE TCM ENGINE RPM MESSAGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform di
51. BIII erase Transmission DTCs Start the engine With the brakes firmly applied shift the gear selector into drive With the DRBIII read Transmission DTCs Did the DTC ENGINE CAN MESSAGE MISSING reset Yes GoTo 6 No Test Complete Perform 1 5 1551 VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 Ignition on engine not running All With the DRBIII read Engine DTCs Are there any performance or bus related Engine DTCs present 69 TRANSMISSION NAG1 Symptom IC CAN MESSAGE INCORRECT When Monitored and Set Condition IC CAN MESSAGE INCORRECT When Monitored Set Condition CAN Bus messages received from the Instrument Cluster are incorrect POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT INSTRUMENT CLUSTER DTCS PRESENT OPEN CAN CIRCUITS AT INSTRUMENT CLUSTER INSTRUMENT CLUSTER ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Trans
52. CAN MESSAGE MISSING reset Yes Replace the Transmission Control Module Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Test complete Perform TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position All Disconnect the ABS harness connector Disconnect the TCM C2 harness connector NOTE Check connectors Clean repair as necessary Measure the resistance of the CAN Bus circuit between the ABS harness connector and the TCM C2 harness connector Measure the resistance of the CAN Bus circuit between theABS harness connector 37 TRANSMISSION NAG1 Symptom ABS LF SENSOR MESSAGE When Monitored and Set Condition ABS LF SENSOR MESSAGE When Monitored Valid ABS CAN messages received at least once and the CAN Bus circuit ABS CAN Message Missing ABS CAN Message Incorrect are not active Set Condition ABS signal Wheel Speed Front Left not valid or ABS has detected a sensor failure POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT ABS DTCS PRESENT ABS CONTROL MODULE ABS LF SENSOR MESSAGE TCM ABS LF SENSOR MESSAGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and r
53. DTCs present in many modules If the other modules are reporting Trans mission CAN Bus messages ONLY answer No for the following question Are other modules reporting active or stored CAN Bus communication DTCs Yes GoTo 3 No GoTo 12 Turn the ignition off to the lock position Disconnect the negative battery cable While back probing measure the resistance between the andthe CAN C Bus in the selected control module harness connector NOTE Termination of the CAN Bus is located in the ECM and SKREEM Both modules use a 120 0 ohm resistor for termination of the CAN Bus A properly terminated CAN Bus will read 60 0 ohms 5 0 ohms Pick the one that best describes your readings 60 0 ohms 5 0 ohms GoTo 4 120 0 ohms 5 0 ohms GoTo 10 Less than 60 0 ohms GoTo 8 49 TRANSMISSION NAG1 CAN BUS CIRCUIT Continued ACTION APPLICABILITY Turn the ignition on All While back probing any module harness connector that uses the CAN Bus measure the voltage between the CAN C Bus circuit and ground While back probing any module harness connector that uses the CAN Bus measure the voltage between the CAN Bus circuit and ground 15 the voltage above 3 0 volts for either circuit Yes GoTo 5 No GoTo 6 Turn the ignition off Using a voltmeter connect one end to the CAN circuit that previously measured above 3 0 volts and the other end to ground NOTE When performing
54. Dealer Technical Operations 800 Chrysler Drive CIMS 486 02 76 Auburn Hills MI 48326 2757 FOLD HERE
55. E Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 84 TRANSMISSION NAG1 MODULATING PRESSURE SOLENOID CIRCUIT Continued ACTION APPLICABILITY Ignition on engine not running With the DRBIII erase DTCs With the DRBIII perform the Solenoid Test With the DRBIII read DTCs Did the DTC Mod Press SOLENOID CIRCUIT reset Yes GoTo 3 GoTo 7 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Mod Press Solenoid Control circuit from the TCM C2 harness connector to the Transmission Solenoid Assembly harness connector 15 the resistance above 5 0 ohms Yes Repair the Mod Press Solenoid Control circuit for an open Perform TRANSMISSION VERIFICATION TEST VER 1 No GoTo 4 Measure the resistance between ground and the Mod Press Solenoid Control circuit 15 the resistance below 5 0 ohms Yes Repair the Mod Press Solenoid Control circuit for a short to ground Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector
56. E SOLENOID ASSEMBLY TCM SHIFT PRESSURE SOLENOID CIRCUIT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 99 TRANSMISSION NAG1 SHIFT PRESSURE SOLENOID CIRCUIT Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII erase DTCs With the DRBIII perform the Solenoid Test With the DRBIII read DTCs Did the DTC SHIFT PRESSURE SOLENOID CIRCUIT reset Yes GoTo 3
57. ENOID CIRCUIT 1 2 4 5 SOLENOID CIRCUIT SHORT TO GROUND Test Note All symptoms listed above are diagnosed using the same tests The title for the tests will be 1 2 4 5 SOLENOID CIRCUIT When Monitored and Set Condition 1 2 4 5 SOLENOID CIRCUIT When Monitored Always monitored with system active at each ignition cycle Set Condition If the TCM detects a short to ground or battery on the solenoid control circuit shorted solenoid open solenoid or an open or shorted solenoid control circuit driver inthe TCM 1 2 4 5 SOLENOID CIRCUIT SHORT TO GROUND When Monitored Always monitored with system active at each ignition cycle Set Condition If the TCM detects a short to ground or battery on the solenoid control circuit shorted solenoid open solenoid or an open or shorted solenoid control circuit driver inthe TCM POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS 1 2 4 5 SOLENOID CONTROL CIRCUIT OPEN 1 2 4 5 SOLENOID CONTROL CIRCUIT SHORT TO GROUND 1 2 4 5 SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS 1 2 4 5 SOLENOID TCM 1 2 4 5 SOLENOID CIRCUIT 24 TRANSMISSION NAG1 1 2 4 5 SOLENOID CIRCUIT Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms Wit
58. ER 1 GoTo 3 107 TRANSMISSION NAG1 SYSTEM OVERVOLTAGE Continued ACTION APPLICABILITY With the DRBIII read the Engine All there any Engine Charging System DTC s present Yes Refer to the Charging category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position Disconnect the TCM C1 harness connector Check connectors Clean repair as necessary Start the engine Increase the Engine Speed to 1500 RPM Measure the voltage of the Transmission Relay Output circuit in the TCM C1 harness connector Is the voltage below 16 9 volts Yes GoTo 5 No Refer the Charging category and perform the symptom Charging System with No DTCs present Perform TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Replace the TCM Perform TRANSMISSION VERIFICATION TEST VER 1 108 TRANSMISSION NAG1 Symptom SYSTEM UNDERVOLTAGE When Monitored and Set Condition SYSTEM UNDERVOLTAGE When Monitored Always monitored with system active at each ignition cycle Set Condition Ignition voltage falls below 8 5 volts with the engine rpm greater than 2000 rpm for 60 seconds POSSIBLE CAUSES ENGINE CHARGING SYSTEM DTC S PRESENT TRANSMISSION RELAY OUTPUT LO AT TCM SYSTEM UNDER VOLTAGE ACTION APPLICABILI
59. I read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs Is the DTC Solenoid Supply Voltage displayed as ACTIVE Yes GoTo 3 No GoTo 6 103 TRANSMISSION NAG1 SOLENOID SUPPLY VOLTAGE Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Solenoid Supply circuit to all other circuits in the Transmission Solenoid harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the Solenoid Supply circuit for a short to other circuits Perform TRANSMISSION VERIFICATION TEST 1 GoTo 4
60. ID CONTROL 17 16YU BL TCC SOLENOID CONTROL 33 20PK SENSOR GROUND TRANSMISSION 20GY BL TEMPERATURE SENSOR P N SWITCH CONTROL 35 20BL DG N3 INPUT SPEED SENSOR MODULE C2 36 16BR GY MODULATION PRESSURE SOLENOID CONTROL 37 16BK RD SHIFT PRESSURE SOLENOID CONTROL 16BK SOLENOID SUPPLY VOLTAGE H 2 CAN BUS L 2006 CAN BUS N N E R 4 7 132 RELAY BLOCK CONNECTOR PINOUTS CIRCULATION PUMP RELAY rycen IGNITION SWITCH RUN START TURN SIGNAL RELAY ANTI THEFT ALARM RELAY BATTERY LEFT RELAY AUXILIARY TURN SIGNAL ANTI THEFT D RELAY ALARM RELAY NO 2 TIME DELAY RIGHT RELAY LAMP RELAY LEFT LAMP RELAY RIGHT ADDITIONAL HEAT EXCHANGER REAR RELAY WINDOW DEFOGGER 0 RELAY RELAY NO 1 OPTIONAL EQUIPMENT DAYTIME RELAY RUNNING LAMPS RELAY eA RELAY FOG LAMP RELAY DAYTIME RUNNING LAMP RELAY LEFT SIDE AUXILIARY FAN RELAY RUNNING LAMP RELAY HORN RIGHT SIDE RELAY NOTE THE RELAY LOCATIONS SHOWN HERE MAY VARY FROM VEHICLE TO VEHICLE TRANSMISSION RELAY RELAY BLOCK CAV CIRCUIT FUNCTION 30 16BK DG TRANSMISSION RELAY OUTPUT 85 16BR GROUND 86 16BK YL FUSED
61. ION TEST 1 116 TRANSMISSION NAG1 Symptom TRANS TEMP SENSOR P N SWITCH CIRCUIT When Monitored and Set Condition TRANS TEMP SENSOR P N SWITCH CIRCUIT When Monitored Always monitored with system active at each ignition cycle Set Condition Temp sensor is open whilein forward gears 1 5 temp sensor open Trans temp circuit P N Switch POSSIBLE CAUSES SHIFTER ADJ USTMENT SENSOR GROUND CIRCUIT OPEN TEMP SENSOR P N SWITCH CIRCUIT OPEN TEMP SENSOR P N SWITCH CIRCUIT SHORT TO GROUND SENSOR GROUND CIRCUIT SHORT TO OTHER CIRCUITS TEMP SENSOR P N SWITCH CIRCUIT SHORT TO OTHER CIRCUITS TEMP SENSOR P N SWITCH TCM TEMP SENSOR P N SWITCH ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all
62. ION TEST VER 1 GoTo 3 Turn the ignition off Disconnect the DRBIII from the DLC Disconnect the TCM harness connectors Turn the ignition on Using a 12 volt test light connected to ground probe the K TCM circuit NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes Repair the K TCM circuit for a short to voltage Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 COMMUNICATION NO RESPONSE FROM TRANSMISSION CONTROL MODULE Continued ACTION APPLICABILITY Turn the ignition off All Disconnect the TCM harness connectors Disconnect the from the DLC Measure the resistance of the K TCM circuit between the TCM connector and the DLC Is the resistance below 5 0 ohms Yes Replace the Transmission Control Module accordance with the Service Information Perform TRANSMISSION VERIFICATION TEST VER 1 Repair the K TCM circuit for an open Perform NAG1 TRANSMISSION VERIFICATION TEST VER 1 SHIFT LEVER ASSEMBLY Symptom BACKUP LAMP CKT SHORT TO GROUND POSSIBLE CAUSES BACKUP LAMP CIRCUIT SHORT TO GROUND SHIFT LEVER ASSEMBLY ACTION Turn the ignition off to the lock position Disconnect the Shift Lever Assembly harness connector Isolate the Backup Lamp circuit remove the Backup Lamp bulbs NOTE Check Backup Lamp bulbs and socke
63. LAMPS DAYTIME RUNNING LAMPS E TO DAYTIME RUNNING RELAY OUTPUT i LAMPS RELAY 8 TRANSMISSION RELAY OUTPUT 1 GROUND 4 TRANSMISSION RELAY FUSED B of gt 8111 4 5 H E M T D G R M 5 135 NOTES 136 CHARTS AND GRAPHS 11 0 CHARTS AND GRAPHS 11 1 5 VOLT SQUARE WAVE TYPICAL PATTERN H R T 5 5 VOLT SQUARE WAVE TYPICAL PATTERN A N G R H 5 80 9 137 CHARTS AND GRAPHS 11 2 TRANSMISSION TEMP SENSOR TRANSMISSION TEMP SENSOR SPECIFICATIONS TEMPERATURE VOLTAGE RESISTANCE CHART TEMPERATURE TEMPERATURE F VOLTAGE RESISTANCE 50 0 73 506 0 45 0 77 534 0 40 564 0 25 0 91 654 0 15 5 718 0 10 750 0 817 0 851 0 886 0 1 23 957 0 1 26 l 8 1 37 8 O 1 40 1 44 1189 0 1 48 1231 0 1 51 1273 0 1 58 1360 0 1 62 1 65 1450 0 1 69 1497 0 1 72 1545 0 1 76 1594 0 1 79 1644 0 1 83 1695 0 1 86 1747 0 1 90 1800 0 1855 0 1911 0 ____1968 0 1968 0 BK I H R T 5 N G R H 5 gt parapan 32 41 50 59 68 5 0 5 10 15 20 25 30 35 40 45 50 a
64. N2 and N3 input speed sensors is greater than 150 rpm POSSIBLE CAUSES SPEED SENSOR DTCS PRESENT INTERMITTENT WIRING AND CONNECTORS INTERNAL TRANSMISSION TCM INPUT SPEED SENSOR MISMATCH ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 78 TRANSMISSION NAG1 INPUT SENSOR MISMATCH Continued ACTION APPLICABILITY With the DRBIII read DTCs Are any Speed Sensor or Sensor Supply DTCs present Yes Repair
65. NGINE TORQUE MESSAGE INCORRECT reset Yes GoTo 4 No Test Complete Perform TRANSMISSION VERIFICATION TEST 1 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 Ignition on engine not running All With the DRBIII read Engine DTCs Are there any performance or bus related Engine DTCs present 102 TRANSMISSION NAG1 Symptom SOLENOID SUPPLY VOLTAGE When Monitored and Set Condition SOLENOID SUPPLY VOLTAGE When Monitored When the solenoid is active or not active and no under voltage condition exists Set Condition If voltageis present when the output is off or the measured supply voltage and measured battery voltage differ by 3 6 volts POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS SOLENOID SUPPLY CIRCUIT SHORT TO OTHER CIRCUIT SOLENOID SUPPLY VOLTAGE CIRCUIT SHORT TO GROUND SOLENOID ASSEMBLY TCM SOLENOID SUPPLY VOLTAGE CIRCUIT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBII
66. OLENOID TCM TCC SOLENOID CIRCUIT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 112 TRANSMISSION NAG1 TCC SOLENOID CIRCUIT Continued ACTION APPLICABILITY Ignition on engine not running With the DRBIII erase DTCs With the DRBIII perform the Solenoid Test With the DRBIII read DTCs Did the DTC TCC SOLENOID CIRCUIT reset Yes GoTo 3 GoTo 7 Turn the ignition off to the lo
67. ON VERIFICATION TEST VER 1 No GoTo 4 Replace and program the ECM per the Service Information With the DRBIII erase Transmission DTCs Start the engine With the brakes firmly applied shift the gear selector into drive With the DRBIII read Transmission DTCs Did the DTC ENGINE TEMP MESSAGE reset Yes Replace the Transmission Control Module Perform NAG1TRANSMISSION VERIFICATION TEST 1 No Test complete Perform TRANSMISSION VERIFICATION TEST VER 1 65 TRANSMISSION NAG1 Symptom ENGINE TORQUE MESSAGE INCORRECT When Monitored and Set Condition ENGINE TORQUE MESSAGE INCORRECT When Monitored Valid Torque CAN messages received at least once and CAN Bus Circuit Engine CAN Message Missing and Engine CAN Message Incorrect are not active Set Condition Engine torque message not valid or PCM ECM controller error POSSIBLE CAUSES ENGINE DTCS PRESENT PCM ECM ENGINE TORQUE MESSAGE INCORRECT TCM TORQUE MESSAGE INCORRECT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and
68. R P N SWITCH 5 6 16BK SOLENOID SUPPLY VOLTAGE 7 20BK BL SENSOR SUPPLY VOLTAGE 8 16WT BL 2 3 SOLENOID CONTROL ELECTROHYDRAULIC 16 3 4 SOLENOID CONTROL CONTROL 10 16BK RD SHIFT PRESSURE SOLENOID CONTROL UNIT 11 46YL BL TCC SOLENOID CONTROL 12 20PK SENSOR GROUND 13 16WT 1 2 4 5 SOLENOID CONTROL SHIFTER ASSEMBLY BLACK CAV CIRCUIT FUNCTION BLACK 4 2 20GY DG RD LAMP DRIVER p ERRET 20BL DG K ABS SHIFTER ASSEMBLY 4 18BR GROUND 9 LEI 5 20BK BL RD BRAKE LAMP SWITCH 6 20DG WT CAN C BUS SHIFTER 7 20DG CAN C BUS ASSEMBLY 18BK DG TRANSMISSION RELAY OUTPUT 9 46WT BL RD FUSED IGNITION SWITCH OUTPUT RUN START 10 16WT RD BACK UP LAMP TRANSMISSION CONTROL MODULE C1 BLACK CAV CIRCUIT FUNCTION 1 20BL K TCM RADIO 2 3 BLACK 4 5 6 30 23 7 10 1 8 T 9 10 TRANSMISSION 23 CONTROL 24 MODULE C1 25 26 27 28 29 16BK DG TRANSMISSION RELAY OUTPUT 30 1888 GROUND 131 N N E R 4 2 7 CONNECTOR PINOUTS TRANSMISSION CONTROL MODULE C2 BLACK CAV CIRCUIT FUNCTION 12 20BL Gy N2 INPUT SPEED SENSOR 13 20BK BL SENSOR SUPPLY VOLTAGE 14 16WT 1 2 4 5 SOLENOID CONTROL REL 15 16YL 3 4 SOLENOID CONTROL 16 16WT BL 2 3 SOLENO
69. RQUE MESSAGE INCORRECT TCM TORQUE MESSAGE INCORRECT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Yes Refer to the Shift Lever category and perform the appropriate symptom GoTo 3 Replace and program the ECM per the Service Information With the DRBIII erase Transmission DTCs Drive the vehicle performing multiple aggressive upshifts and downshifts With the DRBIII read Transmission DTCs Did the DTC E
70. S 3 N 55 60 70 80 85 90 95 100 105 110 115 120 00 Niolo 5 9 155 2276 0 160 2 22 2342 0 165 2 25 2410 0 170 2 29 2479 0 347 2 32 2551 0 G Q 0 80e3afbe 138 DIAGNOSTIC TEST PROCEDURES TELL US DaimlerChrysler Corporation is constantly working to provide the technician the best diagnostic manuals possible Your comments and recommendations regarding the diagnostic manuals and procedures are appreciated To best understand your suggestion please complete the form giving us as much detail as possible Model ________________ ________ ____________ Engine Transmission _____________________ Mileage Diagnostic Procedure Comments recommendations if necessary draw sketch Name Submitted by Address City State Zip Business Phone All comments become property of DaimlerChrysler Corporation and may be used without compensation FOLD HERE NO POSTAGE NECESSARY IF MAILED BUSINESS REPLY MAIL IN THe FIRST CLASS MAIL PERMIT NO 124 CENTER LINE STATES POSTAGE WILL BE PAID BY ADDRESSEE DaimlerChrysler Corporation
71. S PRESENT ABS CONTROL MODULE SHIFT LEVER ASSEMBLY ACTION APPLICABILITY With the DRBIII read ABS DTCs All Are there any bus or Wheel Speed Sensor DTCs present Yes Refer totheABS category and perform the appropriate symptom No GoTo 2 Replace the ABS Control Module per the Service Information Verify if the DTC returns NOTE It may be necessary to drive the vehicle to verify the repair Does the DTC return Yes Replace the Shift Lever Assembly the Service Information No Test Complete 22 SHIFT LEVER ASSEMBLY Symptom UNDER VOLTAGE POSSIBLE CAUSES ENGINE CHARGING SYSTEM DTC S PRESENT TRANSMISSION RELAY OUTPUT CIRCUIT LOW AT SLA SHIFT LEVER ASSEMBLY ACTION APPLICABILITY With the DRBIII read Engine DTC s All Are there any Engine Charging System DTC s present Yes Refer to the Charging category and perform the appropriate symptom GoTo 2 Turn the ignition off to the lock position Disconnect the Shift Lever Assembly harness connector Start the engine Increase the Engine Speed to 1500 RPM Measure the voltage of the Transmission Relay Output circuit in the Shift Lever Assembly harness connector 15 the voltage below 9 0 volts Yes Repair the Transmission Relay Output circuit for an open or high resistance No Replace the Shift Lever Assembly per the Service Information 23 TRANSMISSION NAG1 Symptom List 1 2 4 5 SOL
72. SENSOR ERRATIC ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII monitor the Transmission Temperature With the brakes firmly applied place the gear selector in Drive While monitoring the DRBIII wiggle the wires and connectors from the TCM tothe Transmission Solenoid Assembly Did the Transmission Temperature fluctuate while wiggling the wires Yes Repair the wirin
73. SIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT SHIFT LEVER DTCS PRESENT OPEN CAN BUS CIRCUITS AT SHIFT LEVER SHIFT LEVER ASSEMBLY ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and per
74. T Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII read DTCs NOTE The vehicle must be driven to at least 32 Km h 20 MPH for this DTC to be displayed as active Is the Warm up counter displayed and equal to 0 Yes GoTo 4 GoTo 12 Turn the ignition switch to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector
75. TION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 33 TRANSMISSION NAG1
76. TY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII read Engine 5 Are there any Engine Charging System DTC s present Yes Refer to the Charging category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST 1 GoTo 3 109 TRANSMISSION NAG1 SYSTEM UNDERVOLTAGE Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TCM C
77. a shift lever position that is not correct for the gear chosen by the driver This may cause a DTC to be Set The following complaints may also be the result of an incorrectly adjusted or worn linkage Delayed clutch engagement Erratic shifts Vehicle will drive in neutral Engine will not crank in park or neutral Gear shift linkage will be able to be shifted without the key in the ignition Not able to remove the ignition key in park Parking pawl will not engage properly The shift linkage should also be adjusted when replacing the Transmission repairing the valve body or when repairing any component between the shift lever and the Transmission Some questions to ask yourself when performing the road test are as follows 15 the complaint or concern what you think the problem is based on the drivers description of the problem 15 the Transmission operating normally 15 there a real problem e When does the problem occur 15 the problem only in one gear range What temperature does the problem occur Does the vehicle have to sit over night the problem to occur Does the transmission go into Limp in mode 4 4 4 BULLETINS AND RECALLS Always perform all Safety Recalls and Technical Service Bulletins that are applicable to the prob lem GENERAL INFORMATION 5 0 REQUIRED TOOLS AND EQUIPMENT gt DRBIII diagnostic read out box DRBIII must use the latest release le
78. agnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 62 TRANSMISSION NAG1 ENGINE RPM MESSAGE Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read Engine DTCs Are there any performance or bus related Engine DTCs present Yes Refer to the Driveability category
79. air Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position All Disconnect the ECM harness connector s Disconnect the TCM C2 harness connector NOTE Check connectors Clean repair as necessary Measure the resistance of the CAN Bus circuit between the ECM harness connector and the TCM C2 harness connector Measure the resistance of the CAN Bus circuit between the ECM harness connector and the TCM C2 harness connector 15 the resistance above 5 0 ohms on either circuit Yes Repair the CAN BUS or circuit for an open Perform TRANSMISSION VERIFICATION TEST 1 59 TRANSMISSION NAG1 Symptom ENGINE OVERSPEED When Monitored and Set Condition ENGINE OVERSPEED When Monitored Valid EngineRPM message received at least once the CAN Bus Circuit and Engine CAN Message Missing are not active Set Condition If the engine speed increases above 5100 RPM POSSIBLE CAUSES ENGINE MECHANICAL PROBLEM TRANSMISSION MECHANICAL PROBLEM ECM ENGINE OVERSPEED TCM ENGINE OVERSPEED ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the eng
80. alculated gear is less than actual expected gear no plausible gear is calculated or Actual turbine speed calculated turbine speed gt 300 rpm or calculated transmission ratio 15 above threshold During an Upshift detected calculated gear is less than actual expected gear 1 During Downshift detected calculated gear is less than actual expected gear POSSIBLE CAUSES TRANSMISSION MECHANICAL PROBLEM TCM IMPROPER RATIO ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform t
81. an open Perform NAGI TRANSMISSION VERIFICATION TEST VER1 GoTo 4 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the 1 2 4 5 Solenoid Control circuit 15 the resistance below 5 0 ohms Yes Repair the 1 2 4 5 Solenoid Control circuit a short to ground Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 25 TRANSMISSION NAG1 1 2 4 5 SOLENOID CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the 1 2 4 5 Solenoid Control circuit to all other circuits in the Transmission Solenoid Assembly harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the 1 2 4 5 Solenoid Control circuit for a short to other circuit s Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Note Check connectors Clean repair as necessary Measure the resistance between the 1 2 4 5
82. ance below 5 0 ohms between any other circuit Yes Repair the Shift Pressure Solenoid Control circuit for a short to other circuits Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 100 TRANSMISSION NAG1 SHIFT PRESSURE SOLENOID CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Transmission Control Module C2 harness connector Note Check connectors Clean repair as necessary Measure the resistance between the Shift Pressure Solenoid Control circuit and the Solenoid Supply Voltage circuit in the Transmission Control Module C2 harness connector Is the resistance between 4 0 and 8 0 ohms Yes Replace the Transmission Control Module Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 No Replace the Shift Pressure Solenoid Perform TRANSMISSION VERIFICATION TEST VER1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 101 TRANSMISSION NAG1 Symptom SLA CAN MESSAGE INCORRECT POSSIBLE CAUSES SHIFT LEVER ASSEMBLY DTCS PRESENT PCM ECM ENGINE TO
83. any Speed Sensor and or Sensor Supply DTCs before proceeding with test Perform TRANSMISSION VERIFICATION TEST 1 GoTo 3 Ignition on engine not running With the DRBIII erase Transmission DTCs Start the engine Drive the vehicle to speeds to allow multiple 2 3 and 3 4 upshifts Does the DTC INPUT SENSOR MISMATCH reset and displayed as Yes GoTo 4 No GoTo 6 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 Remove the Transmission Oil Pan and inspect for debris or a plugged Transmission All Oil Filter Is there any debris plugged Transmission Oil Filter or signs of an Internal Transmission problem Yes Repair Internal Transmission as necessary Pay particular atten tion to the Electrohydraulic Control unit Refer to the Service Information for proper repair procedures Perform TRANSMISSION VERIFICATION TEST 1 GoTo 5 No Test Comp
84. apply 9 ROAD TEST PROCEDURE 10 Road test the vehicle Make fifteen to twenty 1 2 2 3 3 4 and 4 5 upshifts 11 Perform these shifts from a standing start to 72 km h 45 MPH with a constant throttle opening of 20 to 25 degrees 12 With speeds below 40 km h 25 MPH make five to eight wide open throttle kickdowns to 1st gear Allow at least 5 seconds each in 2nd and 3rd gear between each kickdown 13 With the DRBIII read Transmission DTCs Were there any Diagnostic Trouble Codes set Yes Repair is not complete refer to appropriate symptom No Repair is complete 127 NOTES 128 COMPONENT LOCATIONS 8 0 COMPONENT LOCATIONS 8 1 ENGINE CONTROL MODULE E ENGINE N CONTROL T MODULE NaS L T N 5 8111ddc8 DRIVER S SEAT TRANSMISSION CONTROL MODULE 8111dcee TRANSMISSION SOLENOID ASSEMBLY CONNECTOR 8111ddcf 129 NOTES 130 9 0 CONNECTOR PINOUTS CONNECTOR PINOUTS ELECTROHYDRAULIC CONTROL UNIT BLACK CAV CIRCUIT FUNCTION 1 20BL DG N3 INPUT SPEED SENSOR 2 16BR GY MODULATION PRESSURE SOLENOID CONTROL 3 20BL GY N2 INPUT SPEED SENSOR 4 20GY BL TEMPERATURE SENSO
85. ash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 68 TRANSMISSION NAG1 ENGINE TORQUE REDUCTION Continued ACTION APPLICABILITY Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 Turn the ignition off to the lock position Disconnect the PCM ECM harness connector s Disconnect the TCM C2 harness connector Measure the resistance of the CAN C Bus circuit between the PCM ECM harness connector and the TCM C2 harness connector Measure the resistance of the CAN C Bus circuit between the PCM ECM harness connector and the TCM C2 harness connector Is the CAN C Bus or circuit open Yes Repair the CAN C BUS or circuit for an open Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Yes Refer to the Powertrain category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Replace and program the PCM ECM per the Service Information With the DR
86. atio and make sure there are no mechanical problems Refer to the Service Information for the proper procedures Were there any problems found Yes Refer to the Service Information for proper repair procedures Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No GoTo 4 Determine if the Transmission is mechanically slipping 15 the transmission slipping Yes Repair internal transmission as necessary Refer to the Service Information for the proper repair procedure Perform TRANSMISSION VERIFICATION TEST VER 1 No Replace Transmission Control Module Perform TRANSMISSION VERIFICATION TEST 1 126 VERIFICATION TESTS Verification Tests NAG1 TRANSMISSION VERIFICATION TEST VER 1 APPLICABILITY 1 Reconnect any disconnected components All 2 Connect the to the Data Link Connector 3 With the DRBIII erase ABS DTCs 4 With the DRBIII erase ECM DTCs 5 With the DRBIII erase Transmission DTCs 6 With the DRBIII display Transmission Temperature Start and run the engine until the Transmission Temperature is HOT above 43 110 7 Check the Transmission fluid and adjust if necessary Refer to the Service Information for the proper Fluid Fill procedure 8 NOTE If internal repairs were performed and the shift quality is still poor it may be necessary to check the internal repair Also check for any TSBs and or Controller Flash updates that may
87. c testing sequence The diagnostic test procedures contain step by step instructions for determining the cause of a transmission diag nostic trouble code Possible sources of the code are checked and eliminated one by one It is not neces sary to perform all of the tests in this book to diagnose an individual code These tests are based on the problem being present at the time that the test is run If the TCM records DTC that will adversely affect the vehicles transmission it will request via the communication bus that the ECM illuminate the Malfunction Indicator Lamp MIL All trans mission DTC s will be stored in the TCM 3 3 1 ACTIVE HARD CODE Any Diagnostic Trouble Code DTC that is set whenever the system or component is monitored is an Active code This means that the problem is there every time the TCM checks that system or component Some codes will set immediately at start up and others will require a road test under specific conditions to set the DTC It must be determined if a code 15 Active repeatable or Stored Intermittent before attempting diagnosis 3 3 2 STORED INTERMITTENT CODE A diagnostic trouble code that is not there every time the TCM checks the circuit or function is a Stored Intermittent code Problems that come and go like this are the most difficult to diagnose they must be looked for under the specific conditions that cause them If the DTC is reset after an ignition the DTC
88. cal Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 29 TRANSMISSION NAG1 Symptom List 3 4 SOLENOID CIRCUIT 3 4 SOLENOID CIRCUIT SHORT TO GROUND Test Note All symptoms listed above are diagnosed using the same tests The title for the tests will be 3 4 SOLENOID CIRCUIT When Monitored and Set Condition 3 4 SOLENOID CIRCUIT When Monitored Always monitored with system active at each ignition cycle Set Condition If the TCM detects a short to ground or battery on the solenoid control circuit shorted solenoid open solenoid or an open or shorted solenoid control circuit driver inthe TCM 3 4 SOLENOID CIRCUIT SHORT TO GROUND When Monitored Always monitored with system active at each ignition cycle Set Condition If the TCM detects a short to ground or battery on the solenoid control circuit shorted solenoid open solenoid or an open or shorted solenoid control circuit driver inthe TCM POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS 3 4 SOLENOID CONTROL CIRCUIT OPEN 3 4 SOLENOID CONTROL CIRCUIT SHORT TO GROUND 3 4 SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS 3 4 SOLENOID TCM 3 4 SOLENOID CIRCUIT 30 TRANSMISSION NAG1 3 4 SOLENOID CIRCUIT Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid lev
89. ck position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the TCC Solenoid Control circuit fromthe TCM C2 harness connector to the Transmission Solenoid Assembly harness connector 15 the resistance above 5 0 ohms Yes Repair the TCC Solenoid Control circuit for an open Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position All Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the TCC Solenoid Control circuit Is the resistance below 5 0 ohms Yes Repair the TCC Solenoid Control circuit a short to ground Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 No GoTo 5 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the TCC Solenoid Control circuit toall other circuits in the Transmission Solenoid Assembly harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the TCC Solenoid Control
90. condition CAUTION Before road testing a vehicle be sure that all components are reassembled During the test drive do not try to read DRBIII screen while in motion Do not hang the DRBIII from the rear view mirror operate it yourself Have assistant available to operate the DRBIII Road testing is an essential step in the diagnostic process that must not be overlooked Along with the diagnostic information obtained from the 2 Scan Tool and the original customer concern the road test helps verify the problem was current and any repairs performed fixed the vehicle correctly Always operate and observe the vehicle under ac tual driving conditions J ust as important as the road test is there are preliminary inspections that should be performed prior to the road test Always check the fluid level GENERAL INFORMATION and condition before taking the vehicle on a road test Determine if the incorrect fluid is being used improper fluid will result in erratic transmission operation Some of the conditions of incorrect fluid level are as follows Delayed engagement Poor shifting or erratic shifting Excessive noise e Overheating The next step is to verify that the shift linkage is correctly adjusted If the shift linkage is incorrectly adjusted a number of complaints can result TheTCM monitors the Shift Lever Position SLP continuously If the linkage is incorrectly adjusted the TCM will sense
91. ctor Note Check connectors Clean repair as necessary Measure the resistance of the Sensor Supply circuit to all other circuits in the Transmission Solenoid harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the Sensor Supply circuit for a short to other circuit s Perform TRANSMISSION VERIFICATION TEST 1 GoTo 4 Turn the ignition off to the lock position Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Sensor Supply circuit to chassis ground in the Transmission Solenoid Assembly harness connector Is the resistance below 5 0 ohms Yes Repair the Sensor Supply Voltage circuit for a short to ground Perform TRANSMISSION VERIFICATION TEST VER 1 No Replace the Transmission Control Module Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 96 TRANSMISSION NAG1 Symptom SHIFT LEVER POSITION INVALID POS
92. diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 117 TRANSMISSION NAG1 TRANS TEMP SENSOR P N SWITCH CIRCUIT Continued ACTION APPLICABILITY Check the Shifter Assembly adjustment per the Service Information Was the Shifter Assembly adjusted correctly Yes GoTo 3 No Adjust the Shifter Assembly per the Service Information Perform TRANSMISSION VERIFICATION TEST 1 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Measure the resistance of the Sensor Ground circuit between the TCM C2 harness connector and the Transmission Solenoid Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the Sensor Ground circuit for an open or high resistance Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position All Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Measure the resistance of the Transmission Temp Sensor P N Switch circuit between the TCM C2 harness connector and the Transmission Solenoid Assembly harn
93. e must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 42 TRANSMISSION NAG1 ABS RF SENSOR MESSAGE Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read ABS DTCs Are there any ABS DTCs present Yes Refer to the BRAKE category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position Replace the ABS Control Module per the Service Information With the DRBIII erase Transmission DTCs Road test the Vehicle With the DRBIII read Transmission DTCs Does the DTC ABS RF SENSOR MESSAGE reset Yes Replace the Transmission Control Module Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 No Test complete Perform TR
94. e run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 58 TRANSMISSION NAG1 ENGINE CAN MESSAGE MISSING Continued ACTION APPLICABILITY Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 Ignition on engine not running With the DRBIII read Engine DTCs Are there any performance or bus related Engine DTCs present Yes Refer to the Powertrain category and perform the appropriate symptom Perform NAG1TRANSMISSION VERIFICATION TEST 1 GoTo 4 GoTo 5 Replace and program the ECM per the Service Information With the DRBIII erase Transmission DTCs Start the engine With the brakes firmly applied shift the gear selector into drive With the DRBIII read Transmission DTCs Did the DTC ENGINE CAN MESSAGE MISSING reset Yes GoTo 6 No Test Complete Perform 1 5 1551 VERIFICATION TEST VER 1 If there are no possible causes remaining view rep
95. e the Transmission Tem perature Sensor P N Switch Assembly per the Service nforma tion Perform NAGI TRANSMISSION VERIFICATION TEST 1 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 Turn the ignition off to the lock position All Disconnect the Transmission Solenoid harness connector NOTE This procedure may set several DTCs in both the ECM and TCM Disregard and erase DTCs after this procedure With the gear selector in park attempt to start the vehicle Does the vehicle start Yes Replace the Transmission Temperature Sensor P N Switch Assembly per the Service Information Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Measure the resistance between ground and the Temp Sensor P N Switch circuit Is the resistance below 5 0 ohms Yes Repair the Temp Sensor P N Switch circuit for a short to ground Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 7 Turn the ignition off to the lock position Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Disconnect the TCM C1 and C2 harness connectors Measure the resistance of the Temp Sensor P
96. e there any CAN bus or Wheel Speed Sensor DTCs present Yes Refer totheABS category and perform the appropriate symptom GoTo 2 Replace the ABS Control Module per the Service Information Verify if the DTC returns NOTE It may be necessary to drive the vehicle to verify the repair Does the DTC return Yes Replace the Shift Lever Assembly per the Service Information No Test Complete 20 SHIFT LEVER ASSEMBLY Symptom OVER VOLTAGE POSSIBLE CAUSES ENGINE CHARGING SYSTEM PRESENT CHECK VOLTAGE AT SLA SHIFT LEVER ASSEMBLY ACTION APPLICABILITY With the DRBIII read Engine All Are there any Engine Charging System DTC s present Yes Refer to the Charging category and perform the appropriate symptom GoTo 2 Turn the ignition off to the lock position Disconnect the Shift Lever Assembly harness connector Start the engine and raise the engine speed to 1500 RPM Measure the Transmission Relay Output voltage at the Shift Lever Assembly harness connector 15 the voltage above 16 0 volts 0 3 volts Yes Repair the Transmission relay Output circuit for over voltage Due to a direct connection to the generator check output voltage at the generator and repair as necessary Replace the Shift Lever Assembly per the Service Information 21 SHIFT LEVER ASSEMBLY Symptom RR WHEEL SPIN CAN MESSAGE NOT VALID POSSIBLE CAUSES ABS WHEEL SPEED SENSOR DTC
97. ed PWM to provide the desired amount of slip Shift Pressure Solenoid The Shift Pressure Solenoid is activated when the TCM determines that a transmission shift is required The solenoid is PWM controller to allow the proper amount of hydraulic pressure to the shift elements The sole noid is only activated during the shifting of the transmission When the solenoid is activated hy draulic pressure is removed from the proper shift elements to allow the desired shift Once the shift is completed the solenoid is turned off Modulation pressure solenoid The modulation pressure is always active The solenoid is pulse width modulated PWM controlled and is used to modulate the hydraulic system pressure to the desired pressure 3 2 4 TRANSMISSION COMPONENT DESCRIPTIONS Shift Assembly The Shift Lever Selector transmits all selector lever positions as well as selected shift ranges to the TCM over the CAN Bus At the same time the selector lever positions P R N and D aretransmit ted by a cable to the selector lever shaft in the transmission Brake shift inter lock To prevent unauthorized shifting out of the park position the Selector lever is locked in the Park position until the ignition key is turned to the run position and the brake pedal is pressed This will allow the driver to shift out of the park position Reverse Lamp Output The Reverse Light Switch is integrated into the shifter module and controls the reve
98. el is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII erase DTCs With the DRBIII perform the Solenoid Test With the DRBIII read DTCs Did the DTC 3 4 SOLENOID CIRCUIT reset Yes GoTo 3 GoTo 7 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the 3 4 Solenoid Control
99. epair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 38 TRANSMISSION NAG1 ABS LF SENSOR MESSAGE Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read ABS DTCs Are there any ABS DTCs present Yes Refer to the BRAKE category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock posi
100. er NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 46 TRANSMISSION NAG1 ACCEL PEDAL SENSOR CAN MESSAGE INCORRECT Continued ACTION APPLICABILITY With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST 1 GoTo 3 With the DRBIII read Transmission DTCs Is the DTC Accel Pedal Sensor CAN Message Incorrect displayed as ACTIVE Yes GoTo 4 GoTo 8 Ignition on engine not running With the DRBIII read Engine DTCs Are there any Engine bus related DTCs present Yes Refer to the Communication category and perform the appropri ate symptom Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Replace the Transmission Control Module NOTE Perform the transmission verification test Did the DTC Accel Pedal Sensor CAN Message Incorrect reset Yes GoTo 7 No Test Complete If there are no possible causes remaining view repair Repair Replace the Engine Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the
101. er or signs of an Internal Transmission problem Yes Repair Internal Transmission as necessary Pay particular atten tion to the Electrohydraulic Control unit Refer to the Service Information for proper repair procedures Perform TRANSMISSION VERIFICATION TEST VER 1 No GoTo 4 81 TRANSMISSION NAG1 Symptom INTERNAL CONTROLLER When Monitored and Set Condition INTERNAL CONTROLLER When Monitored Always monitored with system active at each ignition cycle Set Condition This code is set whenever Transmission Control Module TCM senses internal error If this Internal Controller DTC is set with any Solenoid repair the Solenoid first erase all then verify the Internal Controller DTC sets before replacing the TCM POSSIBLE CAUSES TCM INTERNAL ERROR ACTION APPLICABILITY If there are no possible causes remaining view repair All Repair The Transmission Control Module is reporting internal errors must be replaced Perform TRANSMISSION VERIFICATION TEST VER 1 82 TRANSMISSION NAG1 Symptom INVALID CONTROL MODULE VERSION POSSIBLE CAUSES TRANSMISSION CONTROL MODULE INVALID CONTROL MODULE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics wit
102. erforming transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Attempt to start the vehicde Park and Neutral Does the engine start in either position Park or Neutral Yes GoTo 3 No GoTo 5 122 TRANSMISSION NAG1 TRANS TEMP SENSOR SHORTED Continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Place the gear selector to Drive D Measure the resistance of the Transmission Temperature Sensor between the Temp Sensor P N Switch circuit and the Sensor Ground circuit in the TCM C2 harness connector Is the resistance between 500 ohms and 2500 ohms Yes GoTo 4 No Check for a poor terminal to pin connections at the Solenoid Assembly harness connector and repair as necessary If no prob lems are found in the connector replac
103. ess connector 15 the resistance above 5 0 ohms Yes Repair the Transmission Temp Sensor P N Switch circuit for an open Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 5 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Measure the resistance between ground and the Transmission Temp Sensor P N Switch circuit Is the resistance below 5 0 ohms Yes Repair the Transmission Temp Sensor P N Switch circuit for a short to ground Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 Turn the ignition off to the lock position Disconnect the TCM 1 and C2 harness connectors Disconnect the Transmission Solenoid Assembly harness connector Measure the resistance between the Sensor Ground circuit and all other circuits in the TCM C1 and C2 harness connectors 15 the resistance below 5 0 ohms on any of the circuits Yes Repair the Sensor Ground circuit for a short to other circuits Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 GoTo 7 118 TRANSMISSION NAG1 TRANS TEMP SENSOR P N SWITCH CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the TCM C1 and C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Measure the resistance between the Temp Sensor P N Switch circuit and all o
104. form the appropriate symptom GoTo 3 Ignition on engine not running With the DRBIII read Shift Lever DTCs Are there any Shift Lever DTCs present Yes Refer to the Shift Lever category and perform the appropriate symptom No GoTo 4 97 TRANSMISSION NAG1 SHIFT LEVER POSITION INVALID Continued ACTION Turn the ignition off to the lock position Disconnect the Shift Lever harness connector Measure the resistance between the CAN C Bus circuit and the CAN C Bus circuit in the Shift Lever harness connector Is the resistance 60 ohms 3 0 ohms APPLICABILITY All Yes Replace the Shift Lever Assembly per the service information No Repair the CAN Bus the CAN Bus circuit an open 98 TRANSMISSION NAG1 Symptom SHIFT PRESSURE SOLENOID CIRCUIT When Monitored and Set Condition SHIFT PRESSURE SOLENOID CIRCUIT When Monitored When the solenoid is off solenoid active with 25 75 duty cycle and or the solenoid supply is active Set Condition If the TCM detects a short to ground or battery on the solenoid control circuit shorted solenoid open solenoid or an open or shorted solenoid control circuit driver inthe TCM POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS SHIFT PRESSURE SOLENOID CONTROL CIRCUIT OPEN SHIFT PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO GROUND SHIFT PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS SHIFT PRESSUR
105. g and or connectors as necessary Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 No GoTo 3 120 TRANSMISSION NAG1 TRANS TEMP SENSOR ERRATIC Continued ACTION APPLICABILITY Replace the Transmission Temp Sensor P N Switch Assembly per the Service All Information Perform W5J 400 TRANSMISSION VERIFICATION TEST VER 1 Did the DTC TRANS TEMP SENSOR ERRATIC reset Yes Replace the Transmission Control Module Perform NAG1 TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 121 TRANSMISSION NAG1 Symptom TRANS TEMP SENSOR SHORTED When Monitored and Set Condition TRANS TEMP SENSOR SHORTED When Monitored Always monitored with system active Set Condition Temperature sensor input below a threshold failed temperature sensor short to ground TCM POSSIBLE CAUSES TEMP SENSOR P N SWITCH CIRCUIT SHORT TO GROUND TEMP SENSOR P N SWITCH CIRCUIT SHORT TO OTHER CIRCUITS TCM P N SWITCH CIRCUIT TRANSMISSION TEMPERATURE SENSOR TCM TRANS TEMP SENSOR SHORTED TRANSMISSION TEMP SENSOR P N SWITCH ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to p
106. h a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Validate if the TCM part number and flash is correct for the vehicle Is the TCM part number and flash correct for the vehicle Yes Replace the Transmission Control Module the Service Infor mation Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 Flash the controller is applicable If the controller has the wrong part number or cannot be flashed replace the TCM per the Service nformation Perform TRANSMISSION VERIFICATION TEST VER 1 83 TRANSMISSION NAG1 Symptom MODULATING PRESSURE SOLENOID CIRCUIT When Monitored and Set Condition MODULATING PRESSURE SOLENOID CIRCUIT When Monitored
107. h the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running All With the DRBIII erase DTCs With the DRBIII perform the Solenoid Test With the DRBIII read DTCs Did the DTC 1 2 4 5 SOLENOID CIRCUIT reset Yes GoTo 3 GoTo 7 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the 1 2 4 5 Solenoid Control circuit from the TCM harness connector to the Transmission Solenoid Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the 1 2 4 5 Solenoid Control circuit for
108. harness connector 15 the resistance 60 ohms 3 0 ohms Yes Replace the Instrument Cluster the service information No Repair theCAN Bus the CAN Bus circuit for an open 71 TRANSMISSION NAG1 Symptom CAN MESSAGE MISSING POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT AUTOMATIC TEMP CONTROL DTCS PRESENT INSTRUMENT CLUSTER DTCS PRESENT OPEN CAN BUS CIRCUITS AT INSTRUMENT CLUSTER OPEN CAN BUS CIRCUITS AUTOMATIC TEMP CONTROL AUTOMATIC TEMP CONTROL INSTRUMENT CLUSTER ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission con
109. hat the transmission must shift into or out of 2nd gear or 5th gear The solenoid is only activated during the shifting of the transmission When the solenoid is activated hy draulic pressure is applied to the proper shift de ments in the transmission to allow the desired shift Once the shift is completed the solenoid is turned off 2 3 solenoid The 2 3 solenoid is activated when the TCM determines that the transmission must shift into or out of 3rd gear The solenoid is only activated during the shifting of the transmission When the solenoid is activated hydraulic pressure is applied to the proper shift elements in the trans mission to allow the desired shift Once the shift is completed the solenoid is turned off 3 4 solenoid The 3 4 solenoid is activated when the TCM determines that the transmission must shift into or out of 4th gear The solenoid is only activated during the shifting of the transmission When the solenoid is activated hydraulic pressure is applied to the proper shift elements in the trans mission to allow the desired shift Once the shift is completed the solenoid is turned off TCC solenoid The TCC solenoid is activated when the TCM determines that the Torque con verter clutch should be activated The TCC clutch is a variable slip torque clutch that allows control of torque converter slip from 5 to 95 5 of full TCC engagement The clutch is controlled by the TCC solenoid which is pulse width modulat
110. his procedure prior to Symptom diagnosis Continue GoTo 2 76 TRANSMISSION NAG1 IMPROPER RATIO Continued ACTION APPLICABILITY Determine if there are any Transmission Mechanical problems present All Remove the Transmission Oil Pan and inspect for debris or a plugged Transmission Oil Filter Refer to the Service Information for proper removal and inspection procedures Is there any Debris plugged Transmission Oil filter or signs of an Internal Transmission problem Yes Refer tothe Service Information for the proper repair procedure Pay particular attention to the Valve body components and stuck solenoids Perform TRANSMISSION VERIFICATION TEST VER 1 Replace the Transmission Control Module Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 77 TRANSMISSION NAG1 Symptom INPUT SENSOR MISMATCH When Monitored and Set Condition INPUT SENSOR MISMATCH When Monitored Engine speed greater than 450 rpm no engine speed no TCM under voltage system operation no output speed sensor DTC s signal from the ABS system all wheel speeds above 250 rpm signal from theABS system no rear wheel speed signal from the ABS system no wheel slip detected signal from the ABS system no shifting operation N3 input speed sensor greater than 800 rpm and N2 input speed sensor greater than 0 rpm and the TCM not in reset Set Condition If the speed difference between the
111. ic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 This DTC is an informational DTC Check for any TSBs or Controller updates that may apply This is usually a sign of TCC failure or internal transmission problems Check the Engine and Transmission Cooling Systems for proper operation View repair Repair Repair internal Transmission as necessary Refer to the Service Information for proper repair procedure Perform TRANSMISSION VERIFICATION TEST VER 1 111 TRANSMISSION NAG1 Symptom TCC SOLENOID CIRCUIT When Monitored and Set Condition TCC SOLENOID CIRCUIT When Monitored Always monitored with system active at each ignition cycle Set Condition If the TCM detects a short to ground or battery on the solenoid control circuit shorted solenoid open solenoid or an open or shorted solenoid control circuit driver inthe TCM POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS TCC SOLENOID CONTROL CIRCUIT OPEN TCC SOLENOID CONTROL CIRCUIT SHORT TO GROUND TCC SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS TCC S
112. ine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Determine if there are any Engine Mechanical problems present Are there any Engine Mechanical problems present Yes Refer tothe Service Information for the proper repair procedure Perform NAGI TRANSMISSION VERIFICATION TEST VER1 GoTo 3 60 TRANSMISSION NAG1 ENGINE OVERSPEED Continued ACTION APPLICABILITY Determine if there are any Transmission Mechanical problems present All Remove the Transmission Oil Pan and inspect for debris or a plugged Transmission Oil Filter Is there any debris plugged Transmission Oil Filter or signs of an Internal Transmission problem Yes Refer tothe Service Information for the proper repair procedure Perform TRANSMISSION VERIFIC
113. ing current connect the meter in series with the load e Disconnect the live test lead before disconnecting the common test lead e When using the meter function keep the DRBIII away from spark plug or coil wires to avoid measuring error from outside interference 4 3 WARNINGS 4 3 1 VEHICLE DAMAGE WARNINGS Before disconnecting any control module make sure the ignition is lock position Failure to do so could damage the module When testing voltage or continuity at any control module use the terminal side not the wire end of the connector Do not probe a wire through the insulation this will damage the wire and eventu ally cause the wire to fail because of corrosion Be careful when performing electrical tests so as to prevent accidental shorting of terminals Such mistakes can damage fuses or components Also a second DTC could be set making diagnosis of the original problem more difficult When replacing a blown fuse it is important to use only a fuse having the correct amperage rating The use of a fuse with a rating other than indicated may result in a dangerous electrical system over load If a properly rated fuse continues to blow it indicates a problem in the circuit that must be corrected 4 3 2 ROAD TESTING A COMPLAINT VEHICLE Some complaints will require a test drive as part of the repair verification procedure The purpose of the test drive is to try to duplicate the diagnostic DTC or symptom
114. ission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the Sensor Ground circuit to all other circuits in the Transmission Solenoid harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the Sensor Ground circuit for a short to other circuits Perform TRANSMISSION VERIFICATION TEST 1 GoTo 9 93 TRANSMISSION NAG1 N3 INPUT SPEED SENSOR CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position Disconnect the TCM C2 harness connectors Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the Sensor Ground circuit 15 the resistance Below 5 0 ohms Yes Repair the Sensor Ground circuit for a short to ground Perform TRANSMISSION VERIFICATION TEST VER 1 No GoTo 10 Turn the ignition off to the lock position All With the DRBIII PEP Module being used as a Dual Channel Lab Scope with Miller Special tool 6801 Backprobe Input Speed Sensor Signal circuit using Channel 1 at the TCM harness connector Raise all drive wheels off the ground CAUTION Properly support vehicle Start the engine Place gear selector in drive and increase vehicle speed to engage 2nd gear CAUTION BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS Compare the
115. istance NOTE Refer to the wiring diagrams in the service information to help determine which modules are on the CAN Bus Is the resistance below 50 0 ohms after disconnecting all the modules Yes Repair the CAN Bus circuit for a short tothe CAN Bus circuit Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 Replace the module that when disconnected the short was eliminated Perform TRANSMISSION VERIFICATION TEST VER 1 51 TRANSMISSION NAG1 CAN BUS CIRCUIT Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the ECM harness connector Measure the resistance between the CAN C Bus and CAN C Bus circuits in the ECM harness connector Is the resistance 120 0 ohms 5 0 ohms Yes Replace per the Service Information Perform TRANSMISSION VERIFICATION TEST 1 No GoTo 11 Turn the ignition off to the lock position Reconnect the ECM harness connectors Disconnect the SKREEM harness connector NOTE Check connectors Clean repair as necessary Measure the resistance between the CAN C Bus circuit and the CAN C Bus circuit in the SKREEM harness connector Is the resistance 120 0 ohms 5 0 ohms Yes Replace the Sentry Key Remote Entry Module per the Service Information PerformNAG1TRANSMISSION VERIFICATION TEST VER 1 Repair the CAN Bus and or C Bus drcuit for an open
116. ives information from the Shift Lever Assembly ECM engine management and ABS chassis sys tems controllers over the CAN bus The CAN bus 15 a high speed communication bus that allows real time control capability between various controllers Most messages are sent every 20 milliseconds this means critical information can be shared between the Transmission Shifter Engine and ABS control lers The CAN bus is a two wire bus with a CAN C Bus circuit and Bus circuit The CAN bus uses a twisted pair of wires in the harness to reduce the potential of radio and noise interfer ence The CAN bus also uses 120 ohm terminating resistor in both the ECM and Sentry Key Remote Entry Module SKREEM modules The module terminating resistance is measured across both CAN bus circuits at the ECM or SKREEM module The control system automatically adapts to changes in engine performance vehicle speed and transmission temperature variations to provide consistent shift quality The control system ensures that clutch operation during upshifting and down shifting is more responsive without increased harshness The TCM controls the actuation of sole noid valves for modulating shift pressure and gear change The required pressure level is calculated from the load condition engine speed Power for the transmission system is supplied through the Trans mission Relay The TCM is located in the under the drivers seat of the vehicle The T
117. l remain in the current gear until the ignition is turned off or shifter is placed in the position Once the shifter has been placed in the Trans mission will only allow 2nd gear operation If the problem occurs while the vehicle is not moving the transmission will only allow 2nd gear operation Temporary limp in mode This mode is the same as the permanent limp in mode except if the condition is no longer present the system will resume normal operation Recoverable DTC Undervoltage limp in mode When the TCM detects that system voltage has dropped below 8 5 volts it will disable voltage de pendant diagnostics and place the transmission in the temporary limp in mode When the TCM senses that the voltage has risen above 9 0 volts normal transmission operation will be resumed Hardware Error Mode When the TCM detects a major internal error the transmission will be placed in the permanent limp in mode and cease all communication over the CAN bus Once the TCM has entered this mode normal transmission operation will not resume un til all are cleared from the TCM Loss of Drive If the TCM detects a situation that has resulted or may result in engine or transmission failure the transmission will be placed in the neutral position Improper Ratio Input Sensor Overspeed or Engine Overspeed DTC s will cause the loss of drive Controlled Limp in Mode When a failure condition does not require the TCM to shut down
118. lated problem Verification of proper operation 2 0 IDENTIFICATION OF SYSTEM The 1 Transmission family can be identified by the presence of a 13 pin electrical connector with a bayonet lock on the right hand side of the trans mission The connector is oriented horizontally 3 0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION 3 1 GENERAL DESCRIPTION The NAGI electronic transmission is an electron ically controlled five speed transmission with a controlled slip torque converter The NAGI elec GENERAL INFORMATION tronic transmission is a conventional transmission in that it uses hydraulically applied clutches to shift a planetary gear train However the electronic control system replaces many of the mechanical and hydraulic components used in conventional trans mission valve bodies The ratios for the gear stages are obtained by 3 planetary gear sets Fifth Gear is designed as an Overdrive with a high speed ratio The gears are actuated electronically hydraulically The electronic control system enables precise adaptation of pres sures to the respective operating conditions and to the engine output during a shift phase which results in a significant improvement in shift qual ity 3 2 FUNCTIONAL OPERATION The electronic transmission has fully adaptive control system The system performs its functions based on continuous real time sensor and switch feedback information In addition the TCM rece
119. lete 79 TRANSMISSION NAG1 Symptom INPUT SENSOR OVERSPEED When Monitored and Set Condition INPUT SENSOR OVERSPEED When Monitored Whenever the N2 input speed sensor is greater than 0 rpm Set Condition If the rpm of the N2 or N3 input speed sensor is greater than 7700 rpm POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS INTERNAL TRANSMISSION TCM INPUT SENSOR OVERSPEED ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue
120. ments is a pulse width modulated solenoid and controls the hydraulic system pressure 6 2 DEFINITIONS Driving cycle counter The starts since first set counter indicates the number of driving cycles since the first occurrence of an error 7 0 DIAGNOSTIC INFORMATION AND PROCEDURES COMMUNICATION Symptom NO RESPONSE FROM SHIFTER ASSEMBLY POSSIBLE CAUSES CHECK POWERS AND GROUNDS TO THE SHIFTER ASSEMBLY CONTROLLER ANTILOCK BRAKE K ABS SHIFTER ASSEMBLY CIRCUIT SHORTED TO GROUND CONTROLLER ANTILOCK BRAKE K ABS SHIFTER ASSEMBLY CIRCUIT SHORTED TO VOLTAGE K ABS SHIFTER ASSEMBLY CIRCUIT OPEN SHIFTER ASSEMBLY ACTION APPLICABILITY Turn the ignition off All Disconnect the Shifter Assembly harness connector Check each power and ground circuit to the module Were any problems found Yes Refer tothe wiring diagrams located in the service information to help isolate an open or shorted condition Repair as necessary Perform TRANSMISSION VERIFICATION TEST VER 1 No GoTo 2 Turn the ignition off Disconnect the Shifter Assembly harness connector Disconnect the DRBIII from the DLC Measure the resistance between ground and the K ABS Shifter Assembly circuit Is the resistance below 5 0 ohms Yes GoTo 3 GoTo 4 Turn the ignition off Disconnect the CAB harness connector Measure the resistance between ground and the K ABS Shifter Assembly circuit Is the resistance below 5 0 oh
121. mission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom GoTo 3 70 TRANSMISSION NAG1 CAN MESSAGE INCORRECT Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read Instrument Cluster DTCs Are there any Instrument Cluster DTCs present Yes Refer tothe NSTRUMENT CLUSTER category and perform the appropriate symptom GoTo 4 Turn the ignition off to the lock position Disconnect the Instrument Cluster C1 harness connector Measure the resistance between the CAN Bus circuit and the CAN Bus circuit in the Instrument Cluster
122. ms Yes Repair the K ABS Shifter Assembly circuit for a short to ground Perform TRANSMISSION VERIFICATION TEST VER 1 No Replace the Controller Antilock Brake in accordance with the service information Perform 1 5 1551 VERIFICATION TEST VER 1 COMMUNICATION NO RESPONSE FROM SHIFTER ASSEMBLY Continued ACTION APPLICABILITY Turn the ignition off All Disconnect the DRBIII from the DLC Disconnect the Shifter Assembly harness connector Turn the ignition on Using a 12 volt test light connected to ground probe the K ABS Shifter Assembly circuit NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes GoTo 5 GoTo 6 Turn the ignition off Disconnect the Controller Antilock Brake harness connector Turn the ignition on Using a 12 volt test light connected to ground probe the K ABS Shifter Assembly circuit NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery Does the test light illuminate brightly Yes Repair the K ABS Shifter Assembly circuit for a short to voltage Perform TRANSMISSION VERIFICATION TEST VER1 No Replace the Controller Antilock Brake in accordance with the service information Perform NAG1LTRANSMISSION VERIFICATION TEST VER 1 Turn the ignition
123. nector Disconnect the SLA harness connector Measure the resistance of both the CAN bus and CAN bus circuits from the ECM harness connector to the SLA harness connector 15 the resistance above 5 0 ohms and or either circuit Yes Repair the CAN bus and or circuits for an open No Replace the Shift Lever Assembly per the Service nformation SHIFT LEVER ASSEMBLY Symptom INCORRECT CAN MESSAGE FROM ABS POSSIBLE CAUSES ABS INTERNAL SLA INTERNAL ACTION APPLICABILITY Turn the ignition off to the lock position All Replace the ABS Control Module per the Service Information Ignition on engine not running With the DRBIII erase Transmission DTCs Start the engine and with the brakes firmly applied place the gear selector into Drive With the DRBIII read Transmission DTCs Did the DTC ABS CAN MESSAGES INCORRECT reset Yes Replace the Shift Lever Assembly the Service Information No Test complete SHIFT LEVER ASSEMBLY Symptom INTERNAL CONTROLLER POSSIBLE CAUSES INTERNAL CONTROLLER O_O Repair Instructions INTERNAL CONTROLLER The Shift Lever Assembly has detected an internal fault Replace the Shift Lever Assembly 19 SHIFT LEVER ASSEMBLY Symptom LR WHEEL SPIN CAN MESSAGE NOT VALID POSSIBLE CAUSES ABS WHEEL SPEED SENSOR DTCS PRESENT ABS CONTROL MODULE SHIFT LEVER ASSEMBLY ACTION APPLICABILITY With the DRBIII read ABS DTCs All Ar
124. ntinued ACTION APPLICABILITY Turn the ignition off to the lock position All Disconnect the Transmission Solenoid Assembly harness connector Start the engine With the brakes firmly applied shift the gear selector into Drive Did the engine stall or stumble Yes Repair the internal transmission Pay particular attention to the components related to the TCC Refer to the Service Information for the proper repair procedure Perform TRANSMISSION VERIFICATION TEST 1 GoTo 3 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Measure the resistance between ground and the TCC Solenoid Control circuit 15 the resistance below 5 0 ohms Yes Repair the TCC Solenoid Control circuit for a short to ground Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid harness connector Measure the resistance of the TCC Solenoid Control circuit to all other circuits the Transmission Solenoid harness connector 15 the resistance below 5 0 ohms on any circuit Yes Repair the TCC Solenoid Control circuit for a short to other circuits Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 Replace the Transmission Control Module Perform TRANSMISSION VERIFICAT
125. ntroller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII erase DTCs With the DRBIII perform the Solenoid Test With the DRBIII read DTCs Did the DTC 2 3 SOLENOID CIRCUIT reset Yes GoTo 3 GoTo 7 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the 2 3 Solenoid Control circuit from the TCM C2 harness connector to the Transmission Solenoid Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the 2 3 Solenoid Control circuit an open Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position Disconnect the Transmission Control Module C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the 2 3 Solenoid Control circuit 15 the resistance below 5 0 ohms Yes Repair the 2 3 Solenoid Control circuit for a short to ground Perform TRANSMISSION VERIFICATION TEST 1 GoTo 5 28 TRANSMISSION NAG1 2 3 SOLENOID CIRCUIT
126. nual has unique shift schedules depending on the tempera ture of the transmission oil The transmission oil temperature has a decisive effect on the shift qual ity of the transmission The shift schedule is modi fied to extend the life of the transmission while operating under extreme conditions and to improve driver comfort by modifying shift schedules The transmission oil temperature is measured with a Temperature Sensor on the NAG1 transmis sion The Temperature Sensor is an integral com ponent of the Transmission Solenoid assembly If the Temperature Sensor is causing a problem a DTC will be set in the TCM The Transmission Temperature Sensor is wired in series with the Park Neutral P N switch The P N switch is also located in the transmission The trans mission temperature is only read by the TCM when the P N switch closes while in the R D position When the shifter lever is in the park or neutral position the P N switch opens and the temperature being displayed is Engine temperature AutoStick Feature If equipped This feature allows the driver to manually shift the transaxle when the shift lever is moved sideways to the in position D to adjust the shift range 3 2 6 TRANSMISSION ADAPTIVES INITIALIZE AND STORE Initialize Adaptive This TCM function should be used when a new transmission has been placed in the vehicle This command will reset the TCM adaptive to the factory setting Store Adaptive
127. ock position Disconnect the Transmission Control Module C2 harness connector Note Check connectors Clean repair as necessary Measure the resistance between the 3 4 Solenoid Control circuit and the Solenoid Supply Voltage circuit in the Transmission Control Module C2 harness connector 15 the resistance between 2 5 and 6 5 ohms Yes Replace the Transmission Control Module Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Replace the 3 4 Solenoid per the Service Information Perform NAG1 TRANSMISSION VERIFICATION TEST 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 32 TRANSMISSION NAG1 Symptom ABS BRAKE MESSAGE When Monitored and Set Condition ABS BRAKE MESSAGE When Monitored Valid BrakeCAN message received at least once and CAN Bus Circuit ABS CAN Message Missing ABS CAN Message Incorrect are not active Set Condition Signal brake light switch not valid ABS sending invalid value POSSIBLE CAUSES CAN C BUS CIRCUIT DTC PRESENT ABS DTCS PRESENT ABS BRAKE MESSAGE ERROR TCM BRAKE MESSAGE ERROR AC
128. om Perform TRANSMISSION VERIFICATION TEST 1 GoTo 3 With the DRBIII read ABS DTCs Are there any ABS DTCs present Yes Refer totheABS category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST 1 No GoTo 4 Remove and inspect the Transmission Valve Body and Electrohydraulic Control Unit Assembly per the Service nformation NOTE This DTC is usually set due to a internal transmission problem such as but not limited to stuck solenoid or valve and or contamination in the valve body broken springs leaking clutch seals dislodged or broken snap ring Inspect internal transmission per the Service Information Where there any problems found Yes Repair internal transmission as necessary Refer to the Service Information for the proper repair procedure Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 Replace the Transmission Control Module Perform 5 1551 VERIFICATION TEST VER 1 75 TRANSMISSION NAG1 Symptom IMPROPER RATIO When Monitored and Set Condition IMPROPER RATIO When Monitored Enginerpm greater than 450 rpm output speed greater than 180 rpm no N2 input speed sensor errors present no gear selector lever errors present 85 system errors and all wheel speeds above 450 rpm Set Condition Noshifting operation and detected gear is not the actual gear No shifting oper ation detected c
129. on on and not in Park or Neutral no System Overvoltage or System Undervoltage conditions present or transmission in Park or Neutral and engine RPM greater than 850 RPM Set Condition This is set when a CAN ID was not received in the required time are not being sent from the ABS Controller NOTE TheABS controller is powered by the run only ignition feed This means that this DTC will be set if the key is placed in the start position with the transmission in gear or if in Park or Neutral and the engine RPM is greater than 850 RPM POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT CAN BUS CIRCUIT OPEN ABS DTCS PRESENT ABS CAN MESSAGE MISSING TCM CAN MESSAGE MISSING ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all
130. ostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom GoTo 3 53 TRANSMISSION NAG1 CAN MESSAGE FROM ECM FROM SLA Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read Shift Lever DTCs Are there any Shift Lever DTCs present Yes Refer to the Shift Lever category and perform the appropriate symptom GoTo 4 Turn the ignition off to the lock position Disconnect the Shift Lever harness connector Measure the resistance between the CAN Bus circuit and the CAN Bus circui
131. ously measured below 50 0 ohms and the other end to ground While monitoring the ohmmeter disconnect a CAN Bus module and record the reading NOTE Repeat the above step for each CAN Bus module until all the modules have been disconnected NOTE Refer to the wiring diagrams in the service information to help determine which modules are on the CAN Bus Is the resistance below 50 0 ohms with all the modules disconnected Yes Repair the CAN C Bus circuit or the CAN Bus circuit for a short to ground Perform TRANSMISSION VERIFICATION TEST 1 Replace the module that when disconnected the short to ground was eliminated Perform NAG1 TRANSMISSION VERIFICATION TEST 1 Turn the ignition off Disconnect the negative battery cable Disconnect the 5 harness connector Disconnect the ECM harness connectors Measure the resistance between the CAN Bus circuit and the Bus circuit Is the resistance below 50 0 ohms after disconnecting ECM and SKREEM Yes GoTo 9 No GoTo 10 Turn the ignition off Disconnect the negative battery cable Disconnect the harness connector Disconnect the ECM harness connectors Measure the resistance between the CAN C Bus circuit and the CAN C Bus circuit at any CAN Bus module harness connector Disconnect each CAN Bus module harness connector the vehicle is equipped with one at a time while monitoring the res
132. r Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 The conditions necessary to set this DTC are not present at this time Using the schematics as a guide inspect the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were any problems found Yes Repair as necessary Perform TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 90 TRANSMISSION NAG1 Symptom N3 INPUT SPEED SENSOR CIRCUIT When Monitored and Set Condition N3 INPUT SPEED SENSOR CIRCUIT When Monitored Engine speed greater than 450 rpm no engine speed DTC s no TCM under voltage system operation no output speed sensor signal from the ABS system all wheel speeds above 250 rpm signal from theABS system rear wheel speed DTC s signal from the ABS system no wheel slip detected signal from the ABS system no shifting operation detected gear is 3rd or 4th and the detected gear is the actual vehicle gear Set Condition If the input speed sensor is equal to 0 rpm or a short to ground short to battery open input speed sensor faulty input speed sensor open sensor supply circuit POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS SENSOR SUPPLY VOLTAGE CIRCUIT OPEN N3 INPUT SPEED SENSOR SIGNAL CIRCUIT OPEN N3 SPEED SENSOR
133. ransmission Control Module TCM contin uously checks for electrical problems mechanical problems and some hydraulic problems When a problem is sensed the TCM stores a diagnostic trouble code DTC Some of these codes cause the transmission to go into limp in or default mode GENERAL INFORMATION The will default in the current gear position if a DTC is detected then after a key cycle or shift to park thetransmission will go into Limp in which is mechanical 2nd gear Some 5 may allow the transmission to resume normal operation recover if the detected problem goes away Permanent limp in DTC will recover when the key is cycled but if the same DTC is detected for three key cycles the system will not recover and the DTC must be cleared from the TCM with the DRBIII scan tool Once the DRBIII is in the Transmission portion of the diagnostic program it constantly monitors the TCM to see if the system is in limp in mode If the transmission is in limp in mode the DRBIII will flash the red LED 3 2 1 CONTROLLER MODES OF OPERATION Permanent limp in mode When the TCM determines there is recoverable condition present that will not allow proper transmission operation it will place the transmission in permanent limp in mode When the condition occurs the TCM will turn off all solenoids as well as the solenoid supply output circuit If this occurs while the vehicleis moving the transmission wil
134. re Before disconnecting any hydraulic tubes hoses and fittings be sure that the system is fully depres surized When servicing a vehicle always wear eye pro tection and remove any metal jewelry such as watchbands or bracelets that might make an inad vertent electrical contact When diagnosing a Transmission system prob lem it is important to follow approved procedures where applicable These procedures can be found in the service information Following these procedures is very important to the safety of individuals per forming diagnostic tests 4 2 2 VEHICLE PREPARATION FOR TESTING Make sure the vehicle being tested has a fully charged battery If it does not false diagnostic DTC s or error messages may occur It is extremely important that accurate shift lever position data is available to the TCM The accuracy of any DTC found in memory is doubtful unless the Shift Lever Test performed on the DRBIII Scan Tool passes without failure 4 2 3 SERVICING SUB ASSEMBLIES Some components of the Transmission system are intended to be serviced in assembly only Attempt ing to remove or repair certain system sub components may result in personal injury and or improper system operation Only those components with approved repair and installation procedures in the service information should be serviced 4 2 4 DRBIII SAFETY INFORMATION WARNING EXCEEDING THE LIMITS OF THE MULTIMETER IS DANGEROUS IT C
135. rse lights Reverse Inhibitor The Shift Lever Assembly constantly monitors ABS wheel speed to prevents an inadvertent selection of reverse at speeds above approximately 6 4 Km h GENERAL INFORMATION 4MPH The Reverse inhibitor is part of the Shift Lever Assembly and is controlled by the Shift Lever Assembly module Trans temp sensor P N Switch circuit The TCM will detect the selector lever in park and neutral positions The TCM does this by monitoring the Transmission temperature sensor signal along with the shifter position signals The P N switch contact is operated by a cam located in the trans mission which opens a reed contact switch that is wired in series with the transmission temperature sensor When the P N contact switch is opened in park and neutral the TCM senses a high transmis sion temperature Confirming the P N switch sta tus Note In park or neutral the TCM uses engine temperature to avoid setting a DTC The TCM sends a hardwired signal tothe ECM that will allow the ECM controlled start circuit to engagein P or only The TCM also sends a P N bus message to the ECM to confirm the P N switch status The Normal Transmission Temperature Sensor resistance is between 500 0 and 2500 0 ohms The normal voltage limits for the transmis sion temperature sensor are between 0 5 and 3 0 volts Input Speed Sensors The transmission has two input speed sen sors N2 and N3 both speed sensors
136. ry Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 40 TRANSMISSION NAG1 ABS LR SENSOR MESSAGE Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read ABS DTCs Are there any ABS DTCs present Yes Refer to the BRAKE category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 4 Turn the ignition off to the lock position Replace the ABS Control Module per the Service Information With the DRBIII erase Transmission DTCs Road test the Vehicle With the read Transmission DTCs Does the
137. s Clean repair as necessary Measure the resistance of the Sensor Ground circuit from the TCM C2 harness connector to the Transmission Solenoid Assembly harness connector Is the resistance above 5 0 ohms Yes Repair the Sensor Ground circuit for an open Perform TRANSMISSION VERIFICATION TEST 1 No GoTo 6 Turn the ignition off to the lock position All Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance of the N3 Speed Sensor Signal circuit to all other circuits in the Transmission Solenoid harness connector Is the resistance below 5 0 ohms between any other circuit Yes Repair the N3 Speed Sensor Signal circuit for a short to other circuit s Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 GoTo 7 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transmission Solenoid Assembly harness connector Note Check connectors Clean repair as necessary Measure the resistance between ground and the N3 Input Speed Sensor Signal circuit Is the resistance Below 5 0 ohms Yes Repair the N3 Input Speed Sensor Signal circuit for a short to ground Perform NAG1 TRANSMISSION VERIFICATION TEST VER 1 GoTo 8 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector Disconnect the Transm
138. s DTCs present Must be in valid forward gear Set Condition Engine RPM Turbine Speed is greater than 30 RPM when the Engine torque is less than 100 NM for 1 0 second POSSIBLE CAUSES TCC SOLENOID CONTROL CIRCUIT SHORT TO GROUND TCC SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS INTERNAL TRANSMISSION TCM TCC STUCK ON ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 115 TRANSMISSION NAG1 TCC STUCK ON Co
139. sion controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 With the DRBIII read DTCs Are any Solenoid DTCs present Yes Repair all Solenoid DTCs before proceeding with test Perform TRANSMISSION VERIFICATION TEST VER 1 No GoTo 3 105 TRANSMISSION NAG1 SOLENOID SUPPLY WATCHDOG Continued ACTION APPLICABILITY Turn the ignition off to the lock position All Remove the TCM harness connector Disconnect the Solenoid harness connector Check the resistance between the Solenoid Supply circuit and all other circuits in the TCM harness connector Is the resistance below 5 0 ohms between Solenoid Supply and any other circuit Yes Repair the Solenoid Supply circuit short to other circuits Perform TRANSMISSION VERIFICATION TEST VER 1 TheTCM hasan internal error Replace Transmission Control Module Perform TRANSMISSION VERIFICATION TEST 1 106 TRANSMISSION NAG1 Symptom SYSTEM OVERVOLTAGE When Monitored and Set Condition SYSTEM OVERVOLTAGE When Monitored Always monitored with system active at each ignition cycle Set Condition Ignition voltage above 16 9 volts with the engine and transmission input speed sensors above 2000 rpm for 60 seconds POSSIBLE CAUSES VEHICLE J UMP STARTED IMPROPERLY ENGINE CHARGING SYSTEM 5 PRESENT TR
140. ssary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Engine DTCs Are there any performance or bus related Engine DTCs present Yes Refer to the Driveability category and perform the appropriate symptom Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 GoTo 3 56 TRANSMISSION NAG1 ENGINE CAN MESSAGE INCORRECT Continued ACTION APPLICABILITY Replace and program the ECM per the Service Information All With the DRBIII erase Transmission DTCs Start the engine With the brakes firmly applied shift the gear selector into drive With the DRBIII read Transmission DTCs Did the DTC ENGINE CAN MESSAGE INCORRECT reset Yes GoTo 4 No Test Complete PerformNAG1 TRANSMISSION VERIFICATION TEST VER 1 If there are no possible causes remaining view repair Repair Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1
141. t for a short or corrosion Measure the resistance between ground and the Backup Lamp circuit Is the resistance below 5 0 ohms APPLICABILITY All Yes Repair the Backup Lamp circuit for a short to ground Replace the Shift Lever Assembly per the Service Information SHIFT LEVER ASSEMBLY Symptom BACKUP LAMP CKT SHORT TO VOLTAGE OR OPEN POSSIBLE CAUSES BACKUP LAMP CIRCUIT OPEN BACKUP LAMP CIRCUIT SHORT TO VOLTAGE SHIFT LEVER ASSEMBLY ACTION APPLICABILITY Start the engine All While back probing measure the voltage of the Backup Lamp circuit Is the voltage above 0 5 volts Yes GoTo 2 GoTo 3 Turn the ignition off to the lock position Disconnect the Shift Lever Assembly harness connector Start the engine Measure the voltage of the Backup Lamp circuit in the Shift Lever Assembly harness connector 15 the voltage above 0 5 volts Yes Repair the Backup Lamp circuit for a short to voltage No Replace the Shift Lever Assembly per the Service Information Turn the ignition off to the lock position Disconnect the Shift Lever Assembly harness connector Remove the Backup Lamp bulb s Connect a jumper wire between Shift Lever Assembly circuit Using a 12 volt test light connected to 12 volts check the Backup Lamp circuit in the Backup Lamp socket s NOTE The test light must illuminate brightly Compare the brightness to that of a direct connection to the battery
142. t in the Shift Lever harness connector 15 the resistance 60 ohms 3 0 ohms Yes Replace the Shift Lever Assembly per the service information No Repair the CAN Bus the CAN Bus circuit for an open 54 TRANSMISSION NAG1 Symptom CONTROL MODULE TCM IS NOT CODED POSSIBLE CAUSES TRANSMISSION CONTROL MODULE FLASH ACTION APPLICABILITY View repair All Repair Flash the Transmission Control Module to the proper level Perform TRANSMISSION VERIFICATION TEST VER 1 55 TRANSMISSION NAG1 Symptom ENGINE CAN MESSAGE INCORRECT When Monitored and Set Condition ENGINE CAN MESSAGE INCORRECT When Monitored CAN ID received at least once and CAN Bus Circuit DTC is not active Set Condition DTC Detected if the number of bytes incorrect for CAN ID POSSIBLE CAUSES ENGINE DTCS PRESENT ECM ENGINE CAN MESSAGE INCORRECT TCM ENGINE CAN MESSAGE INCORRECT ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as nece
143. t the wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform NAG1TRANSMISSION VERIFICATION TEST VER 1 No Test Complete 86 TRANSMISSION NAG1 Symptom N2 INPUT SPEED SENSOR CIRCUIT 4 When Monitored and Set Condition N2 INPUT SPEED SENSOR CIRCUIT When Monitored Engine speed greater than 450 rpm no engine speed DTC s no TCM under voltage system operation no output speed sensor signal from the ABS system all wheel speeds above 250 rpm signal from theABS system norear wheel speed DTC s signal from the ABS system no wheel slip detected signal from the ABS system Set Condition If the N2 input speed sensor is equal to 0 rpm or a short to ground short to battery open input speed sensor faulty input speed sensor open sensor supply circuit POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS SENSOR SUPPLY VOLTAGE CIRCUIT OPEN 2 INPUT SPEED SENSOR SIGNAL CIRCUIT OPEN N2 SPEED SENSOR SIGNAL CIRCUIT SHORT TO OTHER CIRCUIT SENSOR GROUND CIRCUIT OPEN SENSOR GROUND CIRCUIT SHORT TO OTHER CIRCUIT N2 INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND SENSOR GROUND CIRCUIT SHORT TO GROUND N2 INPUT SPEED SENSOR N2 INPUT SPEED SENSOR 87 TRANSMISSION NAG1 N2 INPUT SPEED SENSOR CIRCUI
144. th system active at each ignition cycle Set Condition If the TCM detects a short to ground or battery on the solenoid control circuit shorted solenoid open solenoid or an open or shorted solenoid control circuit driver inthe TCM POSSIBLE CAUSES INTERMITTENT WIRING AND CONNECTORS 2 3 SOLENOID CONTROL CIRCUIT OPEN 2 3 SOLENOID CONTROL CIRCUIT SHORT TO GROUND 2 3 SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS 2 3 SOLENOID TCM 2 3 SOLENOID CIRCUIT 27 TRANSMISSION NAG1 2 3 SOLENOID CIRCUIT Continued ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission co
145. the DRBIII read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessary Poor pin to terminal connections can set DTCs Using the wiring diagram schematic as a guide inspect the wiring and connectors Repair as necessary Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run Note Verify flash level of transmission controller Some problems are corrected by software upgrades to the transmission controller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 64 TRANSMISSION NAG1 ENGINE TEMP MESSAGE Continued ACTION APPLICABILITY Ignition on engine not running All With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST 1 GoTo 3 Ignition on engine not running With the DRBIII read Engine DTCs Are there any Engine Temperature Sensor DTCs present Yes Refer to the Driveability category and perform the appropriate symptom Perform TRANSMISSI
146. the solenoid supply but the failure is of a degree where the TCM will place the transmis sion into a predefined gear there will be several shift performance issues Examples of this are with the transmission slipping the controller will at tempt to place the transmission into third gear and maintain third gear for all forward drive conditions Another example is some of the CAN bus message issues if the TCM does not receive required infor mation from the Engine Controller then default values are used which may result in poor transmis sion shift performance 3 2 2 MIL ILLUMINATION For failures detected by the Transmission Con troller that result in the controller placing the transmission into limp in mode except for System Overvoltage and System Undervoltage DTCs the MIL will be illuminated The Transmission Control Module will inform the ECM over the CAN bus that a failure has occurred The ECM will illuminate the MIL If the condition is removed and the failure becomes Stored Intermittent the Transmission controller will stop reporting that the DTC is active and the ECM will extinguish the MIL NOTE The MIL will light when the problem is first detected and it will not go off until the next ignition cycle after all problem conditions have been checked for their presence This normally takes gt several minutes of driving 3 2 3 SOLENOIDS 1 2 4 5 solenoid The 1 2 4 5 solenoid is activated when the TCM determines t
147. ther circuits in the TCM C1 and C2 harness connector Is the resistance below 5 0 ohms on any circuit Yes Repair the Transmission Temp Sensor P N Switch circuit for a short to other circuits Perform TRANSMISSION VERIFICATION TEST 1 GoTo 8 Turn the ignition off to the lock position Disconnect the TCM C2 harness connector NOTE Make sure the Transmission Solenoid Assembly harness connector is connected or the results of the test will be invalid With the brakes firmly applied place the gear selector in Drive Measure resistance between the Temp Sensor P N Switch circuit and the Sensor Ground circuit in the TCM C2 harness connector 15 the resistance between 500 and 2500 ohms Yes Replace the Transmission Control Module Perform TRANSMISSION VERIFICATION TEST VER 1 No Replace the Temp Sensor P N Switch Assembly per the Service Information Perform TRANSMISSION VERIFICATION TEST 1 119 TRANSMISSION NAG1 Symptom TRANS TEMP SENSOR ERRATIC When Monitored and Set Condition TRANS TEMP SENSOR ERRATIC When Monitored When transmission temperature 15 below 170 338 Set Condition When there is a 10 C 18 F variation between each transmission temperature sensor read If the DTC is reset after an ignition cycle the DTC will be set to Stored Intermittent status POSSIBLE CAUSES TRANSMISSION TEMP SENSOR WIRING TCM TRANS TEMP
148. tion Replace the ABS Control Module per the Service Information With the DRBIII erase Transmission DTCs Road test the Vehicle With the DRBIII read Transmission DTCs Does the DTC ABS LF SENSOR MESSAGE reset Yes Replace the Transmission Control Module Perform NAGI TRANSMISSION VERIFICATION TEST VER 1 No Test complete Perform TRANSMISSION VERIFICATION TEST VER 1 39 TRANSMISSION NAG1 Symptom ABS LR SENSOR MESSAGE When Monitored and Set Condition ABS LR SENSOR MESSAGE When Monitored Valid ABS CAN messages received at least once and the CAN Bus circuit ABS CAN Message Missing ABS CAN Message Incorrect are not active Set Condition ABS signal wheel speed rear left not valid or ABS has detected a sensor failure POSSIBLE CAUSES CAN BUS CIRCUIT DTC PRESENT ABS DTCS PRESENT ABS CONTROL MODULE ABS LR SENSOR MESSAGE TCM ABS LR SENSOR MESSAGE ACTION APPLICABILITY NOTE Low fluid level can be the cause of many transmission problems If All the fluid level is low locate and repair the leak then check and adjust the fluid level per the service information NOTE Always perform diagnostics with a fully charged battery to avoid false symptoms With the DRBII1 read the engine DTCs Check and repair all engine DTCs prior to performing transmission symptom diagnostics With the DRBIII read and record all Transmission DTCs NOTE Check connectors Clean repair as necessa
149. troller NOTE Check for any Technical Service Bulletins that may apply Perform this procedure prior to Symptom diagnosis Continue GoTo 2 Ignition on engine not running With the DRBIII read Transmission DTCs NOTE If the DTC CAN BUS CIRCUIT is present perform diagnostics on that symptom first Is the DTC CAN BUS CIRCUIT present Yes Refer to the Transmission category and perform the appropriate symptom GoTo 3 NOTE NOTE If vehicle 15 equipped with Air Conditioning diagnose the ATC system first 15 the vehicle equipped with air conditioning Yes GoTo 4 No GoTo 6 72 TRANSMISSION NAG1 IC ATC CAN MESSAGE MISSING Continued ACTION APPLICABILITY Ignition on engine not running With the DRBIII read Automatic Temp Control DTCs Are there any ATC DTCs present Yes Refer tothe Heating and A C category and perform the appropri ate symptom No GoTo 5 Turn the ignition off to the lock position Disconnect the ATC harness connector Measure the resistance between the CAN Bus circuit and the CAN Bus circuit in the ATC harness connector Is the resistance 60 ohms 3 0 ohms Yes Replace the Automatic Temp Control the service information No Repair theCAN Bus the CAN Bus circuit for an open Ignition on engine not running With the DRBIII read Instrument Cluster or Automatic Temp Control DTCs Are there any Instr
150. ument Cluster DTCs present Yes Refer tothe INSTRUMENT CLUSTER category and perform the appropriate symptom GoTo 7 Turn the ignition off to the lock position Disconnect the Instrument Cluster C1 harness connector Measure the resistance between the CAN Bus circuit and the CAN Bus circuit in the Instrument Cluster harness connector 15 the resistance 60 ohms 3 0 ohms Yes Replace the Instrument Cluster per the service information No Repair theCAN Bus the CAN Bus circuit for an open NOTE If vehicle is equipped with Air Conditioning diagnose the ATC system first 73 TRANSMISSION NAG1 Symptom IMPROPER GEAR When Monitored and Set Condition IMPROPER GEAR When Monitored Engine RPM greater than 450 and output speed ABS greater than 180 RPM No Input Speed sensor N2 N3 Shift lever and or ABS wheel speed DTCs present Set Condition The TCM compares the calculated gear with the gear the transmission has actually engaged If the actual gear differs from the gear calculated by the TCM the TCM value is adjusted to the engaged gear and a counter is increased 2 If after a shift the engaged gear and the calculated gear still match the counter is decreased by 1 point A DTC is detected as soon as the counter exceeds a threshold If the fault is detected 3 consecutive ignition cycles the transmission will be placed in Limp in and the MIL activated POSSIBLE
151. vel gt umper wires gt Test Light gt Ohmmeter gt Voltmeter 6 0 GLOSSARY OF TERMS 6 1 ACRONYMS ABS A C A D APP CAN CKT DLC DRBIII DTC ECM EMCC 10D ISS K LED MIL Antilock Braking system Air conditioner Analog to Digital conversion Accelerator Pedal Position Controller Area Network Vehicle Bus System Circuit Data Link Connector Diagnostic Readout Box Diagnostic Trouble Code Diesel Engine Controller Electronically Modulated Converter Clutch Ignition off draw Input Speed Sensor N2 and N3 K line communication bus Light Emitting Diode Malfunction Indicator Lamp 055 PWM SKREEM SLA SW TCC TCM TP TRD TTS 1 2 4 5 solenoid V2 3 so lenoid V3 4 so lenoid VTCC solenoid Shift Pressure Solenoid Modula tion pressure solenoid Output Speed Sensor derived from the ABS controller Partial Electronically Modulated Converter Clutch Pulse width modulated Sentry Key Remote Entry Module Shift Lever Assembly Switch Torque Converter Clutch Transmission Control Module Throttle Position Torque Reduction Transmission Temperature Sensor controls the shift into and out of 2nd gear or 5th gear controls the shift into and out of 3rd gear controls the shift into and out of 4th gear is pulse width modulated and con trols the TCC clutch is a pulse width modulated solenoid and controls the hydraulic pressure to the shift ele
152. wer the DRBIII If all connections are proper between the DRBI and the vehicle or other devices and the vehicle battery is fully charged an inoperative DRBIII may be the result of faulty cable or vehicle wiring For a blank screen refer to the appropriate Body Diagnostic manual 3 5 2 DISPLAY IS NOT VISIBLE Low temperatures will affect the visibility of the display Adjust the contrast to compensate for this condition 4 0 DISCLAIMERS SAFETY AND WARNINGS 4 1 DISCLAIMERS All information illustrations and specifications contained in this manual are based on the latest GENERAL INFORMATION information available at the time of publication The right is reserved to make changes at any time without notice 4 2 SAFETY 4 2 1 TECHNICIAN SAFETY INFORMATION WARNING ENGINES PRODUCE CARBON MONOXIDE THAT IS ODORLESS CAUSES SLOWER REACTION TIME AND CAN LEAD TO SERIOUS INJURY WHEN THE ENGINE IS OPERATING KEEP SERVICE AREAS WELL VENTILATED OR ATTACH THE VEHICLE EXHAUST SYSTEM TO THE SHOP EXHAUST REMOVAL SYSTEM Set the parking brake and block the wheels before testing or repairing the vehicle If is especially important to block the wheels on front wheel drive vehicles the parking brake does not hold the drive wheels Some operations in this manual require that hydraulic tubes hoses and fittings disconnected for inspection or testing purposes These systems when fully charged contain fluid at high pressu
153. will be set to Stored Inter mittent status DTC status can be Active Stored Intermittent Active is when the DTC is present in the controller and the transmission is in the particular mode of operation for that DTC Stored means that the DTC occurred at some point but is not currently present or the conditions have not been right to check for the presence of the problem when a DTC is classified as Stored nter mittent no TCM reaction is required Emergency running function If DTCs occur safe driving conditions must be re tained but full functionality of the transmission will be limited to avoid damaging the automatic trans mission In the event of certain DTCs the TCM switches to emergency running The TCM will store the appropriate DTC codes and solenoids will be de energized turned off The transmission effects will be e last gear shifted remains in that position The modulating pressure and shift pressure in crease to maximum value The torque converter clutch turned off Shifting manually after a DTC detection is disengaged NOTE The vehicle can still manually to 2nd or reverse gear shifted To accomplish these shifts you must Stop the vehicle Turn the ignition off Start the engine Place the selector lever into D for 2nd gear Place the selector lever into R for reverse gear The emergency running function is retained until the DTC is eliminated or the stored DTC
154. wiring and connectors specific to this circuit Wiggle the wires while checking for shorts and open circuits NOTE Check for any Technical Service Bulletins that may apply Were there any problems found Yes Repair as necessary Perform NAG1TRANSMISSION VERIFICATION TEST 1 No Test Complete Ignition on engine not running All With the DRBIII read Engine DTCs Are there any Accel Pedal DTCs present Yes Refer to the Driveability category and perform the appropriate symptom Perform TRANSMISSION VERIFICATION TEST VER 1 GoTo 6 47 TRANSMISSION NAG1 Symptom CAN BUS CIRCUIT When Monitored and Set Condition CAN BUS CIRCUIT When Monitored Always monitored with system active at each ignition cycle Set Condition Open circuit in the CAN Bus circuit CAN Bus circuit Short to ground of CAN Bus circuit or CAN Bus circuit Short to Voltage of CAN Bus circuit CAN Bus circuit CAN Bus circuit shorted to CAN Bus circuit or a TCM failure Note All CAN message missing DTCS will also be present which indicates a Bus Failure POSSIBLE CAUSES CAN BUS CIRCUITS OPEN TO SKREEM OR ECM CAN BUS CIRCUITS OPEN TO TCM CAN CIRCUITS SHORTED TO GROUND CAN CIRCUIT SHORT TO VOLTAGE CAN CIRCUITS SHORTED TOGETHER MODULE SHORT INTERNALLY MODULE SHORT TO GROUND MODULE SHORT TO VOLTAGE ECM TERMINATING RESISTOR SENTRY KEY REMOTE ENTRY

2006 VA Transmission

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