BENDIX SD-13-4788 User's Manual
Contents
1. BENDIX 17 ANTILOCK TRACTION CONTROLLER MOUNTING HOLES 4 18 PIN CONNECTOR 30 PIN CONNECTOR DIAGNOSTIC DISPLAY EC 17N CONTROLLER WITHOUT LED DIAGNOSTICS EC 17 CONTROLLER WITH LED DIAGNOSTICS FIGURE 1 EC 17 amp EC 17N ANTILOCK TRACTION CONTROLLERS DESCRIPTION GENERAL The EC 17 is an electronic antilock controller It is the base component in a family of full vehicle wheel control antilock systems for buses trucks and truck tractors In addition to the antilock function the EC 17 controller can be assembled and programmed to provide an optional traction control feature Figure 1 shows the basic 17 EC 17N controller configurations Designed to minimize the potential of brake lock up on all wheels during aggressive braking the EC 17 controller based antilock system provides the vehicle with a high degree of stability and steerability during braking In most cases vehicle stopping distance is also reduced The antilock portion of the EC 17 controller based system minimizes wheel skid during hard or aggressive braking By controlling wheel skid at all wheels on the vehicle optimum steering control and stopping distance is obtained Traction control an optional feature in the full vehicle wheel control antilock system helps improve vehicle traction during acceleration in adverse road conditions Integrated with antilock logic traction control monitors wheel speed informati2. BW1910 2010 Bendix Commercial Vehicle Systems LLC All rights reserved 4 2010 Printed in U S A
3. 6 Never exceed manufacturer s recommended pressures T Never connect or disconnect a hose or line containing pressure it may whip Never remove a component or plug unless you are certain all system pressure has been depleted 8 Use only genuine Bendix replacement parts components and kits Replacement hardware tubing hose fittings etc must be of equivalent size type and strength as original equipment and be designed specifically for such applications and systems 9 Components with stripped threads or damaged parts should be replaced rather than repaired Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer 10 Prior to returning the vehicle to service make certain all components and systems are restored to their proper operating condition 11 For vehicles with Automatic Traction Control ATC the ATC function must be disabled ATC indicator lamp should be ON prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving REMOVING THE EC 17 CONTROLLER EC 17 CONTROLLER MOUNTED ON ANTILOCK RELAY VALVE OR ANTILOCK TRACTION RELAY VALVE 1 Remove as much contamination as possible from the assembly s exterior Keep the contamination away from the open ports and electrical connections Identify and remove all air lines connected to the unit 3 Disconnect the electrical
4. POWER TO THE EC 17 CONTROLLER IS GREEN LED FLASHING GO TO SECTION IX TESTING FOR FALSE FAILURE INDICATION CAUSED BY WHEEL SPEED COMPONENTS ARE ANY RED LEDs ILLUMINATED NOTE AND RECORD THE CONDITION OF ALL RED LEDs 1 x GO TO SECTION IV INSPECTION TUS FOR ILLUMINATED LEDs EC 17 CONTROLLER DIAGNOSTIC DISPLAY SECTION IV INSPECTION FOR ILLUMINATED LEDs NOTE RED ECU LED IN START HERE HERE EC 17 CONTROLLER DIAGNOSTICS WINDOW RESET IS THIS LED ILLUMINATED NO I THERE SHOULD BE A MINIMUM OF THREE RED LEDs ILLUMINATED AND OF THE THREE THERE MUST BEA Q m r T T O ECU LED ON OR LFT PLUS A FRT MID OR RER PLUS A MOD OR SES EC 17 CONTROLLER DIAGNOSTIC DISPLAY NO DO THE ABOVE CONDITIONS EXIST YES NOTE THE THREE ILLUMINATED LEDs 1 LED FROM THIS GROUP 1 LED 6 FROM THIS GROUP 1 LED FROM THIS GROUP YES IS MOD LED ILLUMINATED NO THE SEN LED IS ILLUMINATED EC 17 CONTROLLER DIAGNOSTIC DISPLAY USING THE TWO POSITIONING LEDs RIGHT LEFT FRONT REAR GO TO SECTION VII A TESTING THE WHEEL SPEED SENSOR AND TEST THE APPROPRIATE SPEED SENSOR GO TO SECTION V TESTING FOR POWER TO THE EC 17 CONTROLLER REPLACE THE EC 17 CONTROLLER AND REPEAT THE INITIAL START U
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6. 17 controller to the valve using the four hex head bolts Torque the hex head bolts to 98 Ibs in Grade 5 bolts 2 Mount the assembled EC 17 controller and antilock relay valve on the vehicle and orient it in the position marked before removal 3 Reconnect all air lines to the assembly 4 Reconnect the electrical connector s to the EC 17 controller and torque the connector retaining screw jack screw to 15 20 inch pounds 5 valve for operation and leakage prior to placing the vehicle in service 6 Perform the Initial Start up Procedure in the TROUBLESHOOTING section to assure proper system operation Appropriate for both EC 17 EC 17N controllers BRACKET MOUNTED EC 17 CONTROLLERS 1 Secure the EC 17 controller to its bracket using the four hex head bolts Torque to 98 Ibs in Grade 5 bolts 2 After noting the positioning marks mount the EC 17 controller on the vehicle using the mounting hardware retained during removal 3 Reconnect the electrical connector s to the EC 17 controller and torque the connector retaining bolts to 15 20 inch pounds 4 Perform the Initial Start up Procedure in the TROUBLESHOOTING section to assure proper system operation DIAGNOSING AND LOCATING A SYSTEM DIAGNOSTIC TROUBLE CODE GENERAL The EC 17 controller contains self test and diagnostic circuitry that continuously checks for proper operation of the entire antilock traction
7. 17 controller will instantly blink the traction dash lamp to advise the driver that a wheel spin is occurring If the torque limiting feature is programmed in the EC 17 controller uses its link to the engine control module and sends a signal to reduce engine torque to a level suitable for the available traction NOTE THE EC 17 CONTROLLER WILL NOT SIGNAL THE ATR VALVE TO APPLY THE BRAKES EVEN SLIGHTLY AT ANY SPEED ABOVE 25 MPH ANTILOCK AND TRACTION SYSTEM OPERATION DURING COMPONENT FAILURE The Bendix EC 17 controller handles equipment failure using a conservative fail safe philosophy Any single electrical failure of a component devoted to antilock or traction control results in simultaneous illumination of the appropriate condition lamp on the dash a disabling of part or all of the antilock or traction system and reversion to standard braking on wheels no longer under EC 17 controller control Depending upon the type of failure and its position of occurrence the EC 17 controller disables all or only a portion of the antilock and traction system A power or controller failure however will result in complete disabling of both systems and reversion to standard non antilock braking is still available on all wheels There are a variety of ways to clear diagnostic trouble codes detected by the system In most cases the system will reset the diagnostic trouble code condition when the source of the original diagnosti
8. TO THE TRACTION CONTROL BE SEEN ON THE J1922 OR DASH LAMP DID TRACTION 41939 LINK FOR TRACTION CONTROL LAMP BLINK TO FUNCTION THEN GO OUT THE TRACTION SYSTEM IS MAKE CERTAIN TRACTION FUNCTIONING NORMALLY IS ENABLED WITH VEHICLE STATIONARY LOCATE amp ACTIVATE THE REMOTE TRACTION ENABLE SWITCH RETEST yr If the EC 17 controller has been recently replaced make certain it is configured properly for the vehicle If traction control is part of the configuration the enable disable switch must be toggled after power has been applied to the EC 17 controller and before self configuring process traction control operable DID TRACTION CONTROL LAMP GO OUT NO GO TO SECTION X NO YES GO TO SECTION XI TESTING THE TRACTION 11 TESTING TRACTION DASH LAMP CONTROL MODULATOR 17 SECTION ANTILOCK DASH LAMP TESTING DISCONNECT 30 CONNECTOR FROM START HERE EC 17 CONTROLLER AND OBSERVE THE ANTILOCK DASH LAMP YES ANTILOCK DASH LAMP REPLACE THE ILLUMINATED EC 17 CONTROLLER NO WITH IGNITION ON MEASURE VOLTAGE BETWEEN PINS E3 amp A1 A2 A3 VOLTAGE SHOULD BE SAME AS BATTERY VOLTAGE A1 NO GROUND NO REPLACE RELAY amp M IS VOLTAGE CORRECT RETEST FOR BATTERY oe VOLTAGE A3 GROUND YES YES TO DASH LAMP RELAY CHECK WIRING HARNESS AND RELAY FOR SHORTS TO GROUND RECONNECT AND CHECK REPLACE THE FOLLOWING 1 DASH LIGHT BULB 2 FUSE 3 RE
9. YES NO YES YES RF Modulator YES NO YES YES YES LF Modulator NO YES YES RR Modulator YES YES YES LR Modulator YES YES YES Controller NO NO YES Tract Solenoid YES YES Engine Control Module YES YES Voltage NO YES ABS is still available in 6 sensors system if mid sensor is functional When ECM wiring or voltage corrects itself system is restored DIAGNOSTIC TROUBLE CODE LOCATION FIGURE 7 EC 17 CONTROLLER LED DIAGNOSTIC DISPLAY Engine Control Module If the engine control module ECM or the wiring from the EC 17 controller to the ECM fails traction control is disabled Antilock remains active Voltage If system voltage is out of range antilock and traction are disabled The system reverts to standard air braking MULTIPLE FAILURES In the event that multiple failures occur the dash lamp will react as it normally would during a single failure and the EC 17 controller equipped with LEDs will show one diagnostic trouble code at a time When the first diagnostic trouble code is fixed and the system is reset the next diagnostic trouble code area will appear at the LEDs This way the driver or mechanic does not lose track of diagnostic trouble code areas and the system is not restored until each and every error is corrected and the EC 17 controller is cleared of all diagnostic trouble codes ANTILOCK AND TRACTION WIRING GENERAL NOTES The wires that carry information and power into and out of the 17 contr
10. jnpouu Heg Dung RULE 5 Aug uo ZEN 1 0 8 8 3Jua moop SILA ui sigjeinpau TZAN SION 11111 100000 FIGURE 5 EC 17 ANTILOCK TRACTION CONTROLLER SYSTEM WIRING SCHEMATIC drive axles 6 x 4 requires 4 speed sensors for antilock only operation but have the option to use 6 speed sensors for enhanced performance of both antilock and traction operation Vehicle power is supplied to the EC 17 controller from the ignition switch through a 30 amp fuse The electrical ground for the EC 17 controller is the vehicle chassis Aconnection for a traction enable switch is provided and used when the optional traction feature is installed The switch allows traction to be turned on or off manually ATC requires J1922 J1939 drivers requested torque This input is necessary to engage differential braking on units built after mid year 2000 OUTPUTS Modulators The Bendix M 22 modulator is the means by which the EC 17 controller modifies driver applied air pressure to the service brakes The modulator is an electrically controlled air valve located near the service actuator s it controls It is the last valve that air passes through on its way to the brake actuator A wiring harness connects the modulator to the EC 17 antilock controller Sole
11. ANCE VALUES ARE OBTAINED FOR MODULATOR BEING TESTED gren MODULATORS FED CBA HOLD TO COMMON READ 3 5 TO 5 OHMS EXHAUST TO COMMON READ 3 5 TO 5 OHMS Fi LEFT REAR MOD COMMON H1 LEFT FRONT MOD COMMON D1 LEFT REAR MOD EXHAUST Fi LEFT FRONT MOD EXHAUST EXHAUST TO HOLD READ 7 TO 10 OHMS E1 LEFT REAR MOD HOLD G1 LEFT FRONT MOD HOLD A1 RIGHT REAR MOD COMMON C1 RIGHT FRONT MOD COMMON C1 RIGHT REAR MOD EXHAUST E1 RIGHT FRONT MOD EXHAUST FOR BENDIX M 32 MODULATORS Bi RIGHT REAR MOD HOLD Di RIGHT FRONT MOD HOLD RESISTANCE VALUES FOR BENDIX M 21 AND M 22 HOLD TO COMMON EXHAUST TO COMMON EXHAUST TO HOLD READ 4 9 TO 7 OHMS READ 4 9 TO 7 OHMS READ 9 8 TO 14 OHMS PROBE CONNECTOR PINS WITH A MEGOHMMETER AND VERIFY THAT NO CONTINUITY EXISTS COMMON TO GROUND HOLD TO GROUND EXHAUST TO GROUND NO CONTINUITY NO CONTINUITY NO CONTINUITY INSPECT CONNECTOR AND RECONNECT EC 17 CONTROLLER TURN IGNITION ON AND PASS MAGNET OVER RESET ON EC 17 CONTROLLER NOTE REACTION OF RED LEDs ARE RESISTANCE YES VALUES CORRECT GO TO SECTION VI B AND NO REPEAT INITIAL START UP CONTINUE TESTING ARE ANY RED LEDs PROCEDURE IF THIS TEST STEP ILLUMINATED HAS REPEATED TWICE REPLACE THE EC 17 CONTROLLER YES YES RED LEDs REPLACE THE 17 ILLUMINATED CONTROLLER NO GO TO SECTION IV INSPECTION FOR ILLUMINATED LEDs AND RETEST 23 24 START HERE FROM SECTI
12. AY RESISTANCE SHOULD BE 10 12 OHMS THEN CHECK CONTINUITY BETWEEN GROUND ON 30 PIN CONNECTOR A1 2 3 AND BOTH PINS ON THE 2 PIN CONNECTOR LEADING TO THE MODULATOR NO CONTINUITY PERMITTED 2 pin Modulator Connector NO EC 17 Controller and RESISTANCE CORRECT amp NO AntiLock Traction Relay 2 Modulat 2 CONTINUITY GROUND Modulator 30 PINCONNECTOR YES REPAIR OR REPLACE WIRE HARNESS FROM 18 PIN K JHGF EDCBA CONNECTOR TO 2 A1 GROUND PIN CONNECTOR A2 GROUND A3 GROUND 30 SECTION XII TESTING ENGINE CONTROL MODULE WIRE HARNESS NO PASS MAGNET OVER EC 17 START HERE TRC ONLY RED LED ON CONTROLLER RESET amp REPEAT INITIAL START UP PROCEDURE YES TURN IGNITION OFF DISCONNECT 30 PIN CONNECTOR FROM EC 17 CONTROLLER 2 or 3 PIN CONNECTOR AT ENGINE ELECTRONIC CONTROL MODULE 3 PIN 2 PIN CONNECTOR CONNECTOR D3 D2 C3 B2 B3 CHECK WIRE CONTINUITY BETWEEN 30 PIN CONNECTOR EC 17 CONTROLLER AND 2 Tom NT E THO or 3 PIN CONNECTOR AT ENGINE CONTROL LATE MODULE PINS B2 amp B3 ON 30 PIN CONNEC TOR CORRESPOND TO THE WIRES LEADING TO 2 PIN CONNECTOR AND PINS C2 D2 amp D3 ON 30 PINCONNECTOR CORRESPOND HG THE WIRES LEADING 3 PINCONNECTOR 30 PIN CONNECTOR AT ENGINE CONTROL MODULE TES TEST ENGINE CONTROL MODULE WIRE CONTINUITY OK USING ENGINE MANUFACTURER S PROCEDURE REPAIR OR REPLACE VEHICLE WIRE HARNESS 32
13. D middle RER A six sensor configuration 4 The red TRC LED will momentarily illuminate by itself if traction control torque limiting is active if not then the display will go to the condition described in 5 5 Thered TRC and MOD LEDs will momentarily illuminate if traction control differential braking is active if not then the display will go to the condition described in 6 No other LEDs will be on 6 The diagnostic display will return to its normal operational status Assuming no diagnostic trouble codes exist in the antilock or traction system all red LEDs will be off and the single green VLT LED is illuminated 13 EC 17 CONTROLLER SELF CONFIGURING PROCESS Important General Information 1 14 Three aspects of the antilock and traction system are influenced by the self configuring feature of the EC 17 controller A Speed Sensors The number of speed sensors connected to the EC 17 controller will be detected during the self configuration process The EC 17 controller will check the MID SEN mid axle speed sensor locations on its connector to determine if a sensor is connected to it and will default to a six sensor configuration if it detects even one sensor connected If mid axle speed sensors are not detected the EC 17 controller will default to a four sensor configuration Two front and two rear B Electronic Engine Control On units manufactured prior to mid year 2000 if the EC 17
14. D LEDs ARE ANY RED LEDs ILLUMINATED YES GO TO SECTION III INSPECTION FOR ILLUMINATED LEDs NO GO TO INITIAL START UP PROCEDURE 25 SECTION VII B TESTING THE WHEEL SPEED SENSOR GO TO SECTION III INSPECTION YES START HERE FROM SECTION VII A 30 PIN CONNECTOR LEFT FRONT W S RTN LEFT FRONT W S SIGNAL RIGHT FRONT W S RTN RIGHT FRONT W S SIGNAL 1 23 GROUND B1 K2 3 POWER 18 PIN CONNECTOR F3 F2 B3 B2 E3 E2 26 LEFT MID W S RTN LEFT MID W S SIGNAL LEFT REAR W S RTN LEFT REAR W S SIGNAL RIGHT MID W S RTN RIGHT MID W S SIGNAL RIGHT REAR W S RTN RIGHT REAR W S SIGNAL IGNITION OFF REMOVE CONNECTOR FROM EC 17 CONTROLLER MEASURE RESISTANCE BETWEEN THE APPROPRIATE SPEED SIGNAL AND SIGNAL RETURN RESISTANCE FOR BENDIX SENSORS IS BETWEEN 1500 2500 OHMS REFER TO VEHICLE MANUAL FOR THE RESISTANCE VALUES IF OTHER THAN WS 20 SENSOR IS IN USE CHECK CONTINUITY BETWEEN POWER B1 K2 3 AND SPEED SIGNAL THEN BETWEEN GROUND 1 2 3 AND SPEED SIGNAL NO CONTINUITY PERMITTED YES CORRECT RESISTANCE NO DISCONNECT CONNECTOR AT SPEED SENSOR INSPECT THE CONNECTOR THEN CHECK THE RESISTANCE BETWEEN TWO PINS ON SENSOR RESISTANCE BETWEEN 1500 2500 OHMS FOR THE BENDIX SENSORS NO CONTINUITY PERMITTED BETWEEN GROUND A1 2 3 AND SPEED SIGNAL YES RECONNECT CONNECTOR AT SPEED SENSOR AND EC 17 CONTROLLER AND DO MAGNETIC RESET NOT
15. E IF ANY RED LEDS ARE ILLUMINATED NO ARE ANY LEDs ILLUMINATED YES NO ARE SAME RED LEDs ILLUMINATED YES REPAIR OR REPLACE SPEED SENSOR WIRING HARNESS REPLACE THE EC 17 CONTROLLER REPLACE THE SENSOR REPEAT THE INITIAL START UP PROCEDURE GO TO SECTION III INSPECTION FOR ILLUMINATED LEDs SECTION VIII TESTING FOR FALSE INDICATION CAUSED BY DASH LIGHT RELAY WITH IGNITION ON HOLD MAGNET START HERE ON EC 17 CONTROLLER RESET AND NOTE ALL LEDs ARE ILLUMINATED NO TM ARE ALL LEDs ILLUMINATED REPLACE THE EC 17 CONTROLLER YES E3 TO DASH LAMP RELAY REMOVE THE MAGNET FROM THE EC 17 0 CONTROLLER TURN IGNITION OFF AND KJHGF EDCBA DISCONNECT THE 30 PIN CONNECTOR FROM 30 PINCONNECTOR EC 17 CONTROLLER MANUALLY GROUND PIN E3 OF THE 30 PIN CONNECTOR TURN THE IGNITION ON E3 from 30 pin EC 17 connector Controller Relay NO pom IS THE ABS INDICATOR REPLACE THE EC 17 LAMP ILLUMINATED CONTROLLER YES Vehicle Power YES RELAY INCORRECTLY CHECK FOR VEHICLE POWER CONNECTED OR NOT IS POWER DETECTED FUNCTIONING PROPERLY AntiLock Dash Lamp AntiLock Dash Lamp Relay Wiring CHECK THE DASH AND VEHICLE WIRING CHECK FOR CONTINUITY BETWEEN PIN E3 AND THE ABS RELAY TERMINATION REPAIR OR Ground this REPLACE THE WIRE HARNESS terminal or wire CHECK FOR THE PRESENCE OF on relay Coil THE ABS INDICATOR LAMP RELAY EC 17 REPEAT THE IN
16. ET RH LF R C m 3 c la 5 3 c 13 a FLASHING GO ON NOT FLASHING GO TO SECTION V TO SECTION II RESET RESET ONE FROM THIS GROUP ON ONE FROM THIS GROUP ON RH ONE FROM THIS GROUP ON ONE FROM THIS GROUP ON LF 2 u c 5 a R ON GO TO SECTION VI A ON GO TO SECTION VII A m 3 c 5 a C RESET RESET RH LFT ON GO TO SECTION XII 5 R 00000000E 00000000E lt 8 Sen H F R E c 5 RESET RESET INITIAL START UP PROCEDURE TURN IGNITION ON AND START HERE OBSERVE DASH ANTILOCK LAMP NO ANTILOCK DASH LAMP DOES NO NOT BLINK COMES ON AND DID ANTILOCK DASH LAMP BLINK REMAINS ILLUMINATED YES YES IS ANTILOCK DASH LAMP YES GO TO SECTION II INSPECTION STILL ILLUMINATED FOR ILLUMINATED LEDS ANTILOCK DASH LAMP DOES NOT BLINK DOES NOT COME ON GO TO SECTION I GO TO SECTION INSPECTION FOR ILLUMINATED LEDs INCREASE VEHICLE SPEED TO ABOVE 7 MPH FOR AT LEAST 10 SECONDS AND OBSERVE THE DASH LAMP DASH LAMP ILLUMINATES NO THE ANTILOCK SYSTEM IS FUNCTIONING NORMALLY MAKE IS VEHICLE EQUIPPED WITH NOTE OF ANY PARTS REPLACED TRACTION CONTROL OR REPAIRED YES TURN IGNITION OFF THEN AFTER mid year 2000 A ON AND OBSERVE ONLY SERIAL COMMAND NEEDS
17. Figure 4 Working with an exciter or tone ring wheel speed sensors provide information to the EC 17 controller in the form of an AC signal which varies in voltage and frequency as the speed of the wheel increases or decreases The EC 17 controller is designed to receive wheel speed information from various wheel speed sensor models at the rate of 100 pulses 86 pulses if so configured per wheel revolution The EC 17 controller is able to simultaneously receive and individually interpret speed signals from up to six wheel speed sensors Vehicle drive configuration and whether the traction control feature is in use determines the number of speed sensors that must be used A vehicle with a single rear axle drive 4 x 2 4x 4 or 6 x 2 requires 4 speed sensors for both antilock and traction operation A vehicle with two rear Designation Valve EC 17 Controller CR 17 Controller Relay Tractors Only CR 18 Controller Relay ATR 1 ATR 2 WS 24 SENSOR VN 7 gt gt STRAIGHT SPEED SENSOR SENSORS 90 SPEED SENSORS 5 247 SENSOR 4 5 20 SENSOR FIGURE 4 WS 20 AND WS 24 WHEEL SPEED SENSORS 5 05 95 5 j ym u unge 5744884 us Ed IM Mo 2 A jeuBis SM Zd 3841 sJosuas OF SA 20 E jou si 5 5 esy 13 JOJINP
18. ING PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH When working on or around a vehicle the following general precautions should be observed at all times 1 Park the vehicle on a level surface apply the parking brakes and always block the wheels Always wear safety glasses 2 Stop the engine and remove ignition key when working under or around the vehicle When working in the engine compartment the engine should be shut off and the ignition key should be removed Where circumstances require that the engine be in operation EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving rotating leaking heated or electrically charged components 3 Do not attempt to install remove disassemble or assemble a component until you have read and thoroughly understand the recommended procedures Use only the proper tools and observe all precautions pertaining to use of those tools 4 the work is being performed on the vehicle s air brake system or any auxiliary pressurized air systems make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle If the vehicle is equipped with an AD IS air dryer system or a dryer reservoir module be sure to drain the purge reservoir 5 Followingthe vehicle manufacturer s recommended procedures deactivate the electrical system in a manner that safely removes all electrical power from the vehicle
19. ION CONTROL AT VEHICLE SPEEDS OF 0 TO 25 MPH When wheel spin is detected and the vehicle is stopped or moving at any speed up to 25 mph the EC 17 controller simultaneously executes the following operations It instantly blinks the traction dash lamp to advise the driver that a wheel spin is occurring If the torque limiting feature is active the EC 17 controller uses its link to the engine control module and sends a signal to reduce engine torque to a level suitable for the available traction If the differential braking feature is configured into the system the EC 17 controller energizes the solenoid in the ATR valve which then applies air to each of the rear axle modulators Because the modulators are controlled by the EC 17 controller the solenoid valves in the appropriate modulator are opened and closed to gently pump the brake on the spinning wheel only This gentle brake application forces the differential to drive the stationary or slowly spinning wheel Once wheel spin is eliminated the dash lamp goes out and the traction system disengages control In the event that extended periods of traction operation are experienced without vehicle motion being detected the ABS traction system will disable traction control to prevent brake fade The system will re enable traction control after a short period of time TRACTION CONTROL AT VEHICLE SPEEDS ABOVE 25 MPH If wheel spin occurs at any speed above 25 mph the EC
20. ITIAL START UP Controller Relay PROCEDURE q AntiLock Dash Lamp AntiLock Dash Lamp Relay Wiring SECTION IX TESTING FOR FALSE INDICATION CAUSED BY WHEEL SPEED COMPONENTS WITH IGNITION ON HOLD A START HERE MAGNET ON RESET OF EC 17 CONTROLLER AND NOTE LEDs NO REPLACE EC 17 ARE ALL LEDs ILLUMINATED CONTROLLER YES REMOVE MAGNET Magnet here RHT All LEDs Illuminated Gen TURN THE IGNITION OFF AND REMOVE 18 AND 30 PIN CONNECTOR FROM EC 17 CONTROLLER SET VOLT OHMMETER TO AC SCALE AND GENTLY PROBE THE APPROPRIATE SPEED SENSOR PIN PAIR WHILE SPINNING WHEEL BY HAND REFER TO FIGURE 5 FOR THE SPEED SENSOR PIN PAIR LOCATION IN THE 18 OR 30 PIN CONNECTOR VOLTAGE OUTPUT FOR BENDIX WS 20 SENSOR EC 17 CONTROLLER SHOULD BE ABOVE 0 8 VOLTS AC AT 1 RPS DIAGNOSTIC DISPLAY VOLTAGE OUTPUT FOR BENDIX WS 24 SENSOR SHOULD BE ABOVE 0 250 VOLTS AC AT 0 5 RPS IF VOLTAGE IS BELOW THE MINIMUM INSPECT APPROPRIATE AXLE AND WHEEL FOR PRESENCE OF AN EXCITER OR TONE RING AND SPEED SENSOR CHECK SENSOR GAP DISTANCE BETWEEN SPEED SENSOR AND EXCITER RING AND BEARING END PLAY RE ADJUST AS NECESSARY RUN VEHICLE AT 7 MPH OR MORE FOR 10 SECONDS OR MORE TURN OFF IGNITION REPEAT INITIAL START UP PROCEDURE 28 START HERE SECTION X TESTING TRACTION CONTROL DASH LAMP NO IS THIS THE SECOND TIME TO THIS POINT WITH IGNITION OFF REMOVE 30 PIN CONNECTO
21. LAY POWER WIRE 4 RELAY AFTER REPLACING EACH COMPONENT TEST THE DASH LAMP TO DASH LAMP DASH LAMP A2 RELAY 3 3 REPAIR OR REPLACE WIRE HARNESS GROUND REPEAT THE INITIAL START UP PROCEDURE VEHICLE POWER IGNITION DASH LAMP 18 SECTION INSPECTION FOR ILLUMINATED LEDs INSPECT EC 17 CONTROLLER FOR PRESENCE OF ILLUMINATED LEDS AND RECORD START HERE CHECK CLOSELY AND NO OFF NOTE IF GREEN VLT LED IS ILLUMINATED REPLACE THE EC 17 CONTROLLER ARE ANY RED LEDs PED ILLUMINATED GO TO SECTION V TESTING FOR POWER TO THE 17 CONTROLLER NO ARE ANY RED LEDs NO ILLUMINATED IS GREEN LED FLASHING YES YES NOTE AND RECORD THE CONDITION OF ALL RED LEDs GO TO SECTION V TESTING FOR POWER TO THE EC 17 CONTROLLER GO TO SECTION IV INSPECTION FOR ILLUMINATED LEDs RED LEDs GO TO SECTION VIII TESTING FOR FALSE FAILURE INDICATION CAUSED BY DASH LAMP RELAY GREEN VLT LED EC 17 CONTROLLER DIAGNOSTIC DISPLAY 19 20 SECTION Ill INSPECTION FOR ILLUMINATED LEDs INSPECT THE EC 17 CONTROLLER START HERE FOR PRESENCE OF ILLUMINATED LEDS AND RECORD GO TO SECTION V NO IS GREEN VOLT LED ILLUMINATED TESTING FOR POWER TO THE EC 17 CONTROLLER ILLUMINATED YES YES REPLACE THE EC 17 CONTROLLER GO TO SECTION V TESTING FOR
22. N OFF AND CHECK FOLLOWING REMOVE 18 AND 30 PIN CONNECTOR FROM EC 17 CONTROLLER SET VOLT OHMMETER TO AC SCALE AND GENTLY PROBE SPEED SENSOR PIN PAIRS WHILE SPINNING WHEEL BY HAND 30 PIN CONNECTOR PIN PAIRS J1 amp 2 H2 amp 3 18 PIN CONNECTOR PIN PAIRS B2 amp 3 C2 amp 3 E2 amp 3 F2 amp 3 VOLTAGE OUTPUT FOR WS 20 SENSOR SHOULD BE ABOVE 0 8 VOLTS AC AT 1 RPS VOLTAGE OUTPUT FOR WS 24 SENSOR SHOULD BE ABOVE 0 250 VOLTS AC AT 0 5 RPS IF VOLTAGE IS BELOW THE MINIMUM CHECK ITEMS BELOW A CHECK GAP BETWEEN SPEED SENSOR AND EXCITER OR TONE RING GAP FOR BENDIX WS 20 SENSOR SPEED SENDER IS BETWEEN 0 015 INCHES IF SENSOR GAP MUST BE ADJUSTED CHECK FOR LOOSE OR WORN WHEEL BEARINGS BEFORE RE GAPPING SENSOR REFER TO VEHICLE MAINTENANCE MANUAL FOR WORN BEARINGS CHECK SENSOR OUTPUT VOLTAGE IF SENSOR GAP IS CORRECT CHECK WHEEL BEARING FOR FREE PLAY TO VERIFY IT COMPLIES TO MANUFACTURER S RECOMMENDATIONS MAKE CERTAIN EXCITER OR TONE RING IS IN PLACE AND INSPECT CONDITION CHECK FOR MISSING OR DAMAGED TEETH AND THAT IT RUNS TRUE AND PERPENDICULAR TO SENSOR FACE CHECK WIRING HARNESS AND CONNECTORS THAT RUN TO SENSOR CHECK FOR DRAGGING BRAKES OVER ADJUSTED TRAPPED AIR IN ACTUATOR OUT OF ROUND DRUMS MALFUNCTIONING RETURN SPRINGS PARKING BRAKE SYSTEM PROBLEMS ETC AND CORRECT AND RETEST GO TO SECTION IV RECONNECT CONNECTORS 17 CONTROL LER AND SPEED SENSOR DO MAGNETIC RESET NOTE RE
23. ON CONTROLLER SYSTEM SCHEMATIC When programmed to provide traction control in addition to antilock the following components are added One traction solenoid incorporated into the relay valve One dash mounted traction condition lamp Serial connection to engine control module for vehicles programmed for torque limiting feature Traction disable wiring and switch PHYSICAL The EC 17 controller electronics are contained in a non metallic housing and are environmentally protected by an epoxy compound The design of the digital electronics are intended to provide a high degree of protection from radio electromagnetic and environmental interference The patented optional light emitting diode LED display and magnetically actuated reset switch 15 incorporated in the housing for troubleshooting and diagnostic purposes Two electrical connectors located in the controller housing opposite the diagnostic display if so equipped connect the EC 17 controller to antilock and traction system components one 30 pin and one 18 pin connector The optional traction solenoid is linked to the 18 pin connector using a 2 pin Deutsch connector The optional traction solenoid is located in the upper portion of the antilock traction relay valve assembly See Figure 3 MOUNTING The EC 17 controller is available in two different mounting styles One model shown in Figure 1 is a stand alone It is intended for bracket mounting t
24. ON VIA SECTION VI B TESTING THE MODULATOR CONNECTOR ON 21 OR 22 MODULATOR GO TO MODULATOR INSPECT WIRING CONNECTOR DISCONNECT CONNECTOR AND TEST RESISTANCE BETWEEN PINS ON MODULATOR RESISTANCE VALUES FOR BENDIX M 21 AND M 22 MODULATORS HOLD TO COMMON READ 3 5 TO 5 OHMS EXHAUST TO COMMON READ 3 5 TO 5 OHMS EXHAUST TO HOLD READ 7 TO 10 OHMS RESISTANCE VALUES FOR BENDIX M 32 MODULATORS HOLD TO COMMON READ 4 9 TO 7 OHMS EXHAUST TO COMMON READ 4 9 TO 7 OHMS EXHAUST TO HOLD READ 9 8 TO 14 OHMS TEST EACH PIN TO VEHICLE GROUND WITH A MEG OHMMETER AND NOTE THAT NO CONTINUITY EXISTS RESISTANCE READINGS NO CORRECT REPLACE THE MODULATOR YES EXHAUST COMMON HOLD A B C RECONNECT CONNECTOR TO MODULATOR TURN IGNITION ON AND PASS MAGNET OVER RESET ON EC 17 CONTROLLER NOTE REACTION OF RED LEDs ARE ANY RED LEDs NO REPEAT THE INITIAL ILLUMINATED START UP PROCEDURE YES YES REPAIR OR REPLACE MODULATOR WIRE HARNESS SAME RED LEDs ILLUMINATED NO GO TO SECTION IV INSPECTION FOR ILLUMINATED LEDs AND RETEST SECTION VII A TESTING THE WHEEL SPEED SENSOR IGNITION ON NOTE ILLUMINATED LED s START HERE RESET WITH A MAGNET NOTE REACTION OF RED LEDs YES GO TO SECTION VII PART B 2nd TIME TO THIS POINT DURING TESTING AND BEGIN TESTING NO YES NO ANY RED LEDs ON SAME RED LEDs ON YES GO TO SECTION VII PART B AND BEGIN TESTING TURN IGNITIO
25. P PROCEDURE USING THE TWO POSITIONING LEDs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
26. R FROM EC 17 CONTROLLER TURN IGNITION ON AND CHECK FOR VEHICLE VOLTAGE AT TERMINAL C2 YES VEHICLE VOLTAGE DETECTED NO REPAIR OR REPLACE WIRE HARNESS AND RETEST mid year 2000 YES ECU REQUIRES TORQUE REQUEST VIA J1922 OR J1939 SERIAL LINK WITHIN 5 MINUTES OF IGNITION KEY ON OR THE TRACK CONTROL LAMP WILL COME ON REPLACE TRACTION DASH LAMP WITH KNOWN GOOD UNIT REPEAT INITIAL START UP PROCEDURE KJHGF EDCBA 30 PIN CONNECTOR REPLACE EC 17 CONTROLLER 29 SECTION XI TESTING TRACTION CONTROL MODULATOR WITH IGNITION ON INSPECT EC 17 CONTROLLER FOR ILLUMINATED LEDs YES IS TRC ONLY ON NO GO TO SECTION XII TESTING ARE TRC AND NON ENGINE CONTROL MODULE These LEDs I LEDs ON Illuminated WIRE HARNESS YES TURN IGNITION OFF AND REMOVE 18 PIN CONNECTOR FROM EC 17 CONTROLLER CHECK RESISTANCE BETWEEN PINS D2 amp D3 RESISTANCE SHOULD BE 10 12 OHMS REMOVE 30 PIN CONNECTOR AND CHECK CONTINUITY BETWEEN GROUND A1 2 3 AND D2 amp D3 NO CONTINUITY PERMITTED CHECK CONDITION OF 18 PIN CONNECTOR CLEAN RECONNECT TURN IGNITION ON amp PASS MAGNET OVER EC 17 CONTROLLER RESET REPEAT INITIAL START UP PROCEDURE YES RESISTANCE CORRECT amp NO U UV CONTINUITY TO GROUND FED CBA 18 PIN CONNECTOR NO DISCONNECT 2 PIN CONNECTOR AT MODULATOR amp CHECK RESISTANCE OF CONNECTOR HALF ATTACHED TO ANTILOCK TRACTION REL
27. Red LED SEN Red LED ECU Red LED VLT Green LED RESET No LED The MID LED is used with some but not all vehicles When six speed sensors are not installed this LED is not used in the diagnostic process However it Will light when a magnet is placed on the RESET switch in the diagnostic display Nolte ERT Front LED This Red LED illuminates in order to indicate the location of a component or its wiring It will light in conjunction with either the RIGHT or LEFT LED and the MOD or SENS LED MID Middle Axle LED This Red LED is not used in all installations On those vehicles that have six speed sensors installed this Red LED illuminates to indicate the location of a soeed sensor or its wiring The MID LED should not illuminate with the MOD LED RER Rear LED This Red LED illuminates in order to indicate the location of a component or its wiring It will light in conjunction with either the RIGHT or LEFT LED and the MOD or SENS LED RHT Right LED This Red LED illuminates in order to indicate the location of a component or its wiring It will light in conjunction with either the FRONT or REAR LED and the MOD or SENS LED LFT Left LED This Red LED illuminates in order to indicate the location of a component or its wiring It will light in conjunction with either the FRONT or REAR LED andthe MOD or SENS LED TRC Traction LED This Red LED illuminates to indicate a permane
28. Traction will be disabled On those axles where antilock is disabled the system reverts to standard air braking Front modulator If a front modulator fails antilock on that wheel is disabled Antilock and traction on all other wheels remains active Rear modulator A rear modulator failure disables the traction system Antilock on that wheel will also be disabled but antilock on all other wheels remains active Front sensor The wheel is still modulated using input from the opposite sensor on the front axle The traction system is disabled Mid or rear sensor In a four sensor system antilock on that wheel s is disabled but antilock on all other wheels remains active In a six sensor system antilock remains active using input from the remaining functional sensor In both the four and six sensor system traction control is disabled Controller Antilock and traction are disabled The system reverts to standard air braking Traction solenoid Traction control is disabled Antilock remains active T RIGHT FRONT RIGHT MID RIGHT REAR Lu o C T gt LL 5 oc 5 lt C c LEFT FRONT LEFT MID LEFT REAR SYSTEM STILL OPERATING YES NO Failed ABS Front ABS Rear Traction Std Device Left Right Left Right Braking RF Sensor YES YES YES YES YES LF Sensor YES YES YES YES YES RM Sensor YES YES YES YES YES LM Sensor YES YES YES YES YES RR Sensor YES YES YES NO YES LR Sensor YES
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30. a series of labeled light emitting diodes LEDs in the EC 17 controller housing No special tools or equipment are needed to read or interpret the EC 17 controller diagnostic display It should be noted that the EC 17 controller diagnostics display is separate from the antilock and traction condition lamps on the dash With this separation the driver is aware of any issues that occur but is not confused by diagnostic information There are ten LEDs plus a magnetically actuated reset switch The first six LEDs locate an issue to a specific area of the vehicle and the next three indicate the component or its wiring The LEDs are software driven and are either ON or OFF depending upon their monitor function Note right and left front and rear are determined from the driver s seat Note non LED EC 17N controller is also not equipped with a magnetic reset FRT Red LED MID Red LED See Note RER Red LED 12 Differential Braking Only TRACTION DASH Both the Antilock amp Traction dash lamps are ON during the system self test This is the first blink occurrence of the Antilock dash lamp Compare and note the traction lamp s reaction to the Antilock lamp This is the second blink occurrence of the Antilock dash lamp Compare and note the traction lamp s reaction to the Antilock lamp Both dash lamps are OFF and remain OFF at the end of the powerup sequence RHT Red LED LFT Red LED TRC Red LED MOD
31. c trouble code has returned to a normal state for a period of time Isolated diagnostic trouble codes are able to be reset by the system but repeated occurrence and self clearing of some diagnostic trouble codes will require a manual reset This is done to aid in the troubleshooting of intermittent diagnostic trouble codes The PC interface or optional magnetic reset is used to manually clear diagnostic trouble codes 7 AUTO CALIBRATION For optional ATC performance the ECU utilizes a feature referred to as auto calibration Auto calibration allows the ECU to compensate for various tire sizes throughout the life of the vehicle As there are many conditions that can result in the appearance of a change in the tire size several items must be satisfied before the auto calibration feature is active The auto calibration feature would automatically change the ECUs imbedded tire sizes if the difference exceeded approximately 8 If issues occur with your ATC due to tire size changes please contact 1 800 AIR BRAKE or 1 800 247 2725 for assistance SINGLE FAILURE The following list and chart describes how the antilock and traction systems respond to a specific component failure Note right and left front mid and rear are determined from the driver s seat Left front is therefore the corner closest to the driver For example if the right mid sensor RM Sensor on the chart fails front and rear antilock will still be operative
32. connector s from the EC 17 controller 4 Note and mark the mounting position of the assembly on the vehicle Loosen remove and save the nuts on the mounting hardware that attaches the controller relay assembly bracket to the vehicle Remove the relay valve and EC 17 controller from the vehicle 5 Note and mark the position of the EC 17 controller relative to the valve it is mounted on Remove and retain the four hex head bolts that secure the EC 17 controller to the valve Then separate the EC 17 controller from the valve BRACKET MOUNTED EC 17 CONTROLLER 1 Remove as much contamination as possible from the assembly s exterior Keep the contamination away from open air connections and electrical connections 2 Disconnect the electrical connector s from the EC 17 controller 3 Note and mark the mounting position of the EC 17 controller on the vehicle Loosen remove and save the nuts on the mounting hardware that attaches the EC 17 controller bracket to the vehicle Remove the EC 17 controller and bracket from the vehicle 4 Remove and retain the four hex head bolts that secure the EC 17 controller to the bracket Separate the EC 17 controller from the bracket 10 INSTALLING THE EC 17 CONTROLLER EC 17 CONTROLLER MOUNTED ON ANTILOCK RELAY VALVE OR ANTILOCK TRACTION RELAY VALVE 1 After noting the relationship of the positioning marks made prior to disassembly position and secure the EC
33. controller is connected to the control module of an electronic engine the torque limiting and differential braking feature of ATC will be activated when the traction enable disable switch is toggled prior to self configuration After mid year 2000 the electronic engine must transmit the throttle position via the J1922 or J1939 serial link for ATC to be activated during wheel spin C Antilock Traction Relay Valve If the solenoid assembly in the ATR valve is connected to the EC 17 controller the differential braking feature of traction control will be activated during the self configuring process D Traction Disable Switch The traction disable switch must be toggled prior the self configuration process No method is available to disable the self configuration feature Due to the extended period of time the magnet must be held on the RESET to initiate the self configuration process 20 seconds it is unlikely that a self configuration would occur accidentally Basic four soeed sensor antilock operation can not be removed during the self configuration process This is a minimum configuration for all EC 17 controllers If a speed sensor is connected to either wheel on the mid axle the EC 17 controllers will configure for six sensors If no mid axle speed sensor is detected the EC 17 controller will configure for four sensors Any disconnected speed sensor s will register as a failure on the diagnostic display at th
34. controllers they are not always used PREVENTIVE MAINTENANCE Every 3 months 25 000 miles or 900 operating hours 1 Check all wiring and connectors to ensure they are secure and free from visible damage 2 Although the EC 17 controller incorporates self check diagnostics the optional LED display should be inspected to ensure that it is functional With the vehicle ignition on a magnet 800 gauss capable of picking up 3 ounces held to the LED reset switch indicated on the housing should cause all of the LEDs to illuminate If one or more of the LEDs DO NOT ILLUMINATE and the dash condition lamps indicate the system is functioning properly the non illuminated LED s should be noted for future reference Although the diagnostic capabilities will be limited the system will continue to function as designed 3 Road test the vehicle by making an antilock stop from a vehicle speed of 20 miles per hour When an antilock stop is made the modulator solenoids pulsate and an audible burst of air can be heard from outside of the cab The wheels should not enter a prolonged lock condition Also make a traction acceleration by accelerating on a road surface with reduced traction As with antilock audible bursts of air can be heard when the traction system is functioning 4 EC 17 controllers not equipped with an LED display require the use of separate diagnostic tools capable of using the S A E J1587 diagnostic Link WARN
35. e end of the EC 17 controller self test 6 All or part of traction control can be lost during self configuration by A Not connecting one of the wire harnesses engine control module for torque limiting and ATR valve solenoid for differential braking B A missing or inoperative traction control enable disable switch C Not toggling the traction control enable disable switch in the traction enabled after power up but prior to the self configuration The operator can tell that the traction features are lost by noting the absence of the traction lamp flash upon power up The operator should note the flashing of the antilock condition lamp and the traction lamp if traction equipped upon every power up Observing the dash lamps is one method the operator has to verify the system operation The EC 17 controller can be reprogrammed up to 10 000 times When a replacement EC 17 controller is installed on a vehicle that does not have one or more of the preprogrammed features a failure will be registered on the dash lamp s and on the EC 17 controller diagnostic display For this reason it is necessary to perform the self configuring procedure Some configuration information is available by observing the reaction of the dash condition lamps on vehicles configured with traction control and equipped with the self configuring EC 17 controller When the ignition is switched ON the EC 17 controller self test is begun D
36. ether the problem may reside in the component itself or the wiring The following troubleshooting procedure is devoted to narrowing the diagnostic trouble code to either the wiring or a specific antilock or traction component It should be noted that ALL TROUBLESHOOTING BEGINS BY OBSERVING THE ANTILOCK AND TRACTION CONDITION LAMPS ON THE DASH All troubleshooting should begin by first performing the Initial Start up Procedure and following the directions contained in it TROUBLESHOOTING TIPS 1 Begin by observing the dash condition lamp s and performing the Initial Start Up Procedure 2 Thetroubleshooting technician should record all findings and the action taken during the troubleshooting process 3 No voltage or resistance tests are performed into the EC 17 controller All voltage and resistance tests are performed by beginning at the wire harness half of the connector and moving AWAY from the EC 17 controller toward an antilock traction system component modulator wheel speed sensor etc 15 NOTHING ON GO TO SECTION V ONE OR MORE ON GOTO SECTION IV ON NOT FLASHING ON GO TO SECTION XI 16 DIAGNOSTIC DISPLAY QUICK REFERENCE This index is presented for the benefit of personnel experienced in troubleshooting Bendix full vehicle wheel control antilock with traction control It provides a quick reference to specific sections that provide testing procedures and values RESET RES
37. ics display To clear or reset an EC 17N controller not equipped with LEDs the S A E J1587 diagnostic link must be utilized IMPORTANT The balance of this manual deals with diagnostics and controller self configuration using the optional LED display on the EC 17 controller see Figure 1 Antilock systems using EC 17N controller see Figure 1 must use the Bendix Diagnostic Communication Interface or DCI for diagnostics or reconfiguration POWER AND COMMUNICATION INDICATION LAMPS COMPUTER SERIAL PORT CONNECTOR 1587 DIAGNOSTIC CONNECTOR CONNECTED TO VEHICLE DIAGNOSTIC LAMPS RESET SWITCH FIGURE 8 DIAGNOSTIC COMMUNICATIONS INTERFACE DIAGNOSTIC COMMUNICATION INTERFACE The DCI part 5004893 is a dual level electronic diagnostic tool for either the EC 17 or EC 17N antilock controller It can either be used as a stand alone diagnostic tool or with Bendix s ACom For Windows software part 5004892 In order to use the DCI the vehicle must be equipped with a 1587 diagnostic link connector as illustrated in Figure 9 This connector is generally located on the driver s side in lower portion of the dash or under the dash panel MPSI Tool Multi Protocol Cartridge J38500 1500 PCMCIA Card For Bendix J38500 2400 VEHICLE DIAGNOSTIC CONNECTOR 1587 FIGURE 9 VEHICLE DIAGNOSTIC CONNECTOR LOCATION Used with its Microsoft Windows based software and a perso
38. ion of the EC 17 controller diagnostic display until the LEDs begin to flash then remove the magnet If the magnet is not removed during the LED flashing a second self configuration may be initiated The magnet may have to be held on the RESET for as long as 20 seconds When the self configuration process is complete the EC 17 controller will automatically go through a self test During the self test the diagnostic display will indicate the new configuration as described under the section entitled EC 17 Controller Configuration Display Note f the EC 17 controller is being configured with traction control either torque limiting differential braking or both the traction control condition dash lamp will be illuminated as well as the appropriate LEDs on the EC 17 controller diagnostic display The traction control dash lamp will be illuminated until the traction control enable disable switch is placed in the traction control enabled position traction control operative Place the traction control enable disable switch in the traction control enabled position traction control operative the traction control dash lamp should be off Before placing the vehicle in service verify the configuration and the system condition by turning the ignition OFF then ON while observing the EC 17 controller diagnostic display The diagnostic display should indicate the desired configuration as described under the section entitled EC 17 Controlle
39. k modulator s at the affected wheel s Solenoid valves contained in the modulator hold and exhaust are energized and de energized by the EC 17 controller in order to modify the brake application When a solenoid coil is energized its shuttle moves Depending upon the function of the specific solenoid it either opens or closes thereby causing the exhaust or reapplication of air pressure to the brake actuator The solenoids in each modulator are controlled independently by the EC 17 controller By opening and closing the solenoid valves in the appropriate modulator the EC 17 controller is actually simulating what drivers do when they pump the brakes It must be remembered however that unlike the driver the EC 17 controller is able to pump each brake on the vehicle independently and with far greater speed and accuracy OPERATION TRACTION CONTROL ATC PHILOSOPHY Traction control is a natural extension of antilock Just as antilock helps vehicle control and stability during braking traction control helps during vehicle acceleration The wheel speed sensors not only detect rapid decreases in wheel speed for antilock but also detect unreasonably high increases for traction control With traction control a spinning wheel is instantly detected and compared with the other wheels on the vehicle both front and rear Two methods are used to control wheel spin torque limiting and differential braking Both methods could be co
40. nal computer the DCI is able to provide the technician with a high level of diagnostic information and antilock diagnostic trouble code history This is particularly useful when attempting to determine the source of intermittent diagnostic trouble code indication from the antilock dash condition lamp For field use or when a is not available the 5 integral LED display and switch provides the EC 17N controller user with exactly the same information that is available from the optional LED display on the EC 17 controller When using the LED display for system diagnosis or controller self configuration the descriptions LAP TOP COMPUTER TO VEHICLE i 1587 SERIAL CONNECTOR FIGURE 10 DCI CONNECTED TO LAP TOP COMPUTER Windows is a registered trademark of Microsoft Corporation 11 LAMP CONFIGURATION TABLE Torque Limiting amp Differential Braking Torque Limiting Only ANTILOCK TRACTION ANTILOCK TRACTION ANTILOCK DASH DASH DASH DASH DASH and procedures presented in this manual can be used When connected to a PC use the instructions and documentation packaged with the DCI to troubleshoot or reconfigure the EC 17 EC 17N controller For more information on the Bendix Diagnostic Communication Interface see your local authorized Bendix parts outlet or call 1 800 AIR BRAKE 1 800 247 2725 OPTIONAL DIAGNOSTIC LEDS amp RESET The condition of specific components is provided by
41. nfigured within the ECU independently or together On units manufactured after mid year 2000 only torque limiting can be configured independently On units manufactured after mid year 2000 it will also be necessary that the J1922 or 41939 serial link protocol communicate the vehicle throttle position or the ATC will not function With traction control a spinning wheelis instantly detected and compared with the other wheels on the vehicle both front and rear Two different methods are used to control wheel spin torque limiting and differential braking Depending upon vehicle type speed and road surface condition each method provides a unique and desirable type of wheel spin control Ideally both methods are used to control vehicle traction While all EC 17 controllers are capable of providing wheel control antilock and traction control utilizing both methods of control not all systems will be configured for both methods Depending upon the vehicle either or both traction control methods will be activated during the self configuration procedure Torque Limiting In order for the torque limiting control feature to be used the vehicle must be equipped with an electronically controlled engine throttle The torque limiting feature allows the EC 17 controller to reduce engine torque to a suitable level for the available traction Torque limiting helps to minimize the amount or speed of wheel spin It is especially useful in helpi
42. ng to minimizing a power jackknife and when all drive wheels are on an equally slippery surface Differential Braking In order for the differential braking control to be used the vehicle must be equipped with an antilock traction relay valve such as the Bendix ATR 1 or ATR 2 Additionally after mid year 2000 the ECU requires J1922 J1939 drivers torque request The ATR 1 and ATR 2 relay valves contain a solenoid assembly which provides this feature The differential braking feature allows the EC 17 controller to gently pump the brake on the spinning wheel Since the vehicle s differential tends to drive the wheel that presents the least resistance the wheel on the most slippery surface a slight brake application to this wheel only forces the differential to drive the stationary or slowly spinning wheel Differential braking can be activated only when vehicle speed is under 25 MPH and one drive wheel is spinning faster than the other s Traction Enable Disable Switch The traction control enable disable switch allows the operator to engage or disengage the traction control system as necessary The switch may be used to either engage or disengage the traction control system while the vehicle is in motion It must be noted however that while the traction control will disengage while the vehicle is in motion it will not re engage even with the switch in the engaged position until the vehicle comes to a complete stop TRACT
43. noid valves contained in the modulator provide the electrical interface between the EC 17 controller electronics and the air brake system The EC 17 controller is able to simultaneously and independently control four individual modulator assemblies When vehicle power is supplied to the EC 17 controller a modulator chuff test is performed When the brake pedal is depressed and the ECU is powered via the ignition switch the patented modulator Chuff test is audible A properly wired modulator will exhaust air with a sharp or crisp audible Chuff On ECU s manufactured prior to mid year 2000 the hold solenoid of a modulator is energized three times longer than an exhaust solenoid while the Chuff test is being executed If the modulator hold and exhaust solenoid wires are reversed the audible Chuff is not crisp because of the extended exhaust energization After mid year 2000 the hold solenoid of the modulator is energized twice while the exhaust solenoid is energized once If the modulator hold and exhaust solenoid wires are reversed the modulator will exhaust twice during a Chuff The vehicle modulators will Chuff in the sequence right front left front right rear left rear It will execute this exhaust sequence twice for a total of eight exhausts Both patented audible Chuff tests help the mechanic verify when the modulators are functional and connected correctly without needing additional test equi
44. nt diagnostic trouble code in the traction control system It may be illuminated with the MOD LED or may illuminate by itself NOTE If a problem may exist with the wiring to the engine control module ECM this LED will go on MOD Modulator LED This Red LED illuminates to indicate an open or short circuit in the solenoids of one of the four modulators or the wiring connecting them to the system When indicating a diagnostic trouble code with a modulator this LED will be illuminated with two positioning LEDs RHT LFT FRT RER NOTE The MID positioning LED should not be illuminated with this LED This LED is also used to indicate a possible problem with an ATR 1 or 2 valve antilock traction relay solenoid When illuminated for a traction system diagnostic trouble code the TRC LED will also be on SEN Speed Sensor LED This Red LED illuminates to indicate an open or short circuit in one of the speed sensors or the wiring connecting them to the system The SEN LED will be illuminated with two positioning LEDs RHT LFT FRT MID RER ECU Electronic Control Unit LED This Red LED when illuminated indicates that the controller itself has failed Before controller replacement is considered always check vehicle voltage to the controller VLT LED This Green LED illuminates and remains ON during vehicle operation to indicate that vehicle power is reaching the controller If vehicle power is out
45. o a frame member and is not attached to an antilock relay valve The other EC 17 controller is designed to be mounted on one of four different valves All of the valves provide the ANTILOCK TRACTION 17 CONTROLLER ASSEMBLY TRACTION SOLENOID IN HOUSING 2 PIN CONNECTOR TO TRACTION SOLENOID TRACTION RELAY FIGURE 3 EC 17 CONTROLLER W ANTILOCK TRACTION RELAY VALVE relay function and replace the standard service relay on antilock equipped vehicles In some instances the valves also provide specialized functions When the EC 17 controller is mounted on any of these valves the result is a final assembly with its own model designation Refer to the chart below and Figure 3 AntiLock Added Function Vehicle Valve Provided Application AR 1 None All AR 2 Bobtail Brake Proportioning Traction All AT 1 AntiLock Traction Traction amp Bobtail Tractors Only AT 2 AntiLock Traction Brake Proportioning EC 17 CONTROLLER INFORMATIONAL INPUTS AND COMMAND OUTPUTS GENERAL The EC 17 controller receives information from several components in the antilock system and based on these inputs issues commands or delivers information Some portions of the EC 17 controller both receive and deliver commands and information See Figure 5 INPUTS Wheel speed information is provided to the EC 17 controller via a wiring harness from individual wheel speed sensors at the vehicle wheels See
46. of range below 10 VDC above 18 0 VDC this LED will flash until power is brought into range RESET Beneath the RESET area of the display is a magnetically sensitive switch that is used to reset the diagnostic system The device will respond to a magnet which has strength sufficient to lift a three 3 ounce weight Momentarily holding a magnet against the RESET will cause ALL LEDs to light during the time the magnet is against it Holding a magnet against the RESET longer than 20 seconds will cause the EC 17 controller to initiate the self configuration feature EC 17 CONTROLLER CONFIGURATION IMPORTANT GENERAL NOTE The following information and procedure applies to the EC 17 controller equipped with the optional LED diagnostic display and magnetic RESET switch Controllers without this option EC 17N must use the J1587 diagnostic link and the DCI with its related computer programs to reconfigure the controller See the documentation and instructions packaged with the equipment for specifics EC 17 CONTROLLER CONFIGURATION DISPLAY 1 Turn the ignition ON 2 All LEDs will illuminate then go out 3 The number of active sensors will be displayed by the momentary illumination of the red SEN sensor LED and two or more of the red locating LEDs No other LEDs will be on A SEN FRT front RER rear A four sensor configuration all systems must have at least a 4 sensor configuration B SEN MI
47. oller are generally grouped and terminate at a connector The wire groups or wire harnesses along with the connectors are most often specified and or supplied by the vehicle manufacturer The connectors used on the EC 17 controller are illustrated in Figure 5 The wiring harnesses and connectors are weather resistant and the wires that enter the connector are sealed to the connector The wire gauge used in the wire harnesses is specific to the task performed When diagnosing wiring in the antilock system the following general rules apply and should be followed where applicable 1 Itis generally advisable to replace a wire harness rather than repair individual wires in the harness a splice repair must be made it is important that the splice be properly soldered with a water based or thoroughly cleaned rosin flux not acid based and made water proof 2 Do not pierce wire insulation when checking for continuity Check for power ground or continuity by disconnecting the connector and testing the individual pins or sockets in the connector 3 Do not spread or enlarge individual pins or sockets during probing 4 Always check the vehicle handbook for wire and connector identification Individual wire identification will differ depending upon the type of connectors in use the vehicle manufacturer and the system features in use 5 While the retarder disable serial link and traction on off connections are present on all EC 17
48. on from the sensors during acceleration as well as braking The system helps maintain vehicle stability on hazardous road surfaces and improves driveability and safety The EC 17 controller contains a self configuring or learning feature that allows it to be configured by the user when installed on the vehicle Because of this feature all EC 17 controllers contain all the features and options available and will activate the specific features required for the vehicle it is installed on The EC 17 controller can be installed on vehicles with only antilock or vehicles using the traction control feature The procedure for activating the self configuring feature is contained in the section entitled Configuring The EC 17 Controller In order to provide full vehicle wheel control antilock the EC 17 controller is used in combination with the following components Four or six wheel speed sensors Four air pressure modulator valves One dash mounted antilock condition lamp One service brake relay valve Sd DV N A I0 5 ANT 5 ATEINASSV NOLLOVuL DIDO ILLNV HO TIEN N3 NOLLOvVHL NS ONIHdS SOO ILLNV 1 15 AKV a P OLLSOND VIG JF NOLLOvVu L FIGURE 2 EC 17 ANTILOCK TRACTI
49. pment If an issue is detected with the modulators proceed with modulator troubleshooting or compare the modulator wiring to the vehicle wiring schematic found in Figure 5 An AntiLock dash light through an electrical relay is connected to and controlled by the EC 17 controller and serves as a means of advising the driver of the condition of the antilock system DELIVERY PORT 2 M 30 MODULATOR SUPPLY B PORT 1 x ELECTRICAL CONNECTOR EXHAUST PORT 3 M 32 MODULATOR FIGURE 6 M 30 M 32 AND M 32QR MODULATORS Two control link connections to the engine or transmission retarder and its relay are provided on the EC 17 controller One control link or the other can be utilized but not both on the same vehicle The hardware for one control link conforms to S A E standard 1708 and the protocol or coded language used conforms to S A E standard J1922 The other control link conforms to S A E standard J1939 Use of a control link allows the EC 17 controller to temporarily disable the retarder during certain modes of operation Units built after mid year 2000 have improved retarder operation allowing the retarder to re enable sooner following an ABS event While the EC 17 controller is capable of this function and connections are provided it is not always used Use of the retarder disable function is not essential but highly recommended for vehicles equipped with a re
50. r Configuration Display and no red LEDs should be illuminated at the end of the self test If the configuration appears correct but the diagnostic LEDs indicate a failure somewhere in the system refer to the General Configuration Information section and use the Troubleshooting section of this manual to locate and repair the diagnostic trouble code If the configuration is incorrect the process can be repeated as required One common error is performing the self configuration without toggling the traction control enable disable switch This will prevent any traction features from being activated Note The traction switch must be toggled to configure traction but must be placed in the enable position to allow the traction lamp to flash TROUBLESHOOTING IMPORTANT BEFORE TROUBLESHOOTING 1 Determine if the vehicle is equipped with traction control The presence of a traction condition lamp on the dash can be used 2 Some vehicles are equipped with a traction control disabling switch If so equipped ENABLE THE TRACTION SYSTEM BEFORE BEGINNING THE TROUBLESHOOTING THE TRACTION CONTROL MUST BE DISABLED FOR DYNAMIC TESTING 3 Ifthe vehicle is equipped with traction control and is a tandem axle unit note the number of drive axles The MID diagnostic LED is used only on 6x4 vehicles GENERAL While the EC 17 controller diagnostic display locates a specific diagnostic trouble code area it is still necessary to confirm wh
51. system including wiring continuity The 17 amp EC 17N controllers are programmed at the factory to accommodate the needs of the vehicle and the customer s desires Both the 17 amp EC 17N controller can be reconfigured by the end user to include traction control See the Important notice concerning the EC 17N controller A vehicle equipped with traction control can generally be identified by noting the presence of a dash mounted condition lamp a disable switch for the traction control system and a traction solenoid located above the relay valve Separate dash lamps controlled by the 17 17 controller advise the driver of the condition of the entire antilock traction system When the controller senses an erroneous condition it stores the condition in memory illuminates the dash mounted condition lamp and after certain criteria are met it disables the antilock or traction control function If so equipped the EC 17 controller illuminates the appropriate diagnostic LEDs The diagnostic trouble code condition is truly stored and is not cleared by loss of power to the antilock system The optional LEDs will illuminate when power is restored and remain illuminated until the failure is corrected After the actual issue is corrected maintenance personnel can clear or reset the EC 17 controller diagnostics through the S A E J1587 diagnostic link or the optional magnetic RESET point in the diagnost
52. tances Atraction dash light is connected to and controlled by the EC 17 controller and serves as a means of advising the driver of the condition of the traction control system A connection to the traction solenoid located in the upper portion of the antilock traction relay valve see Figure 3 is provided via a 2 pin Deutsch connector OPERATION ANTILOCK ABS PHILOSOPHY The Bendix EC 17 antilock system uses individual sensors modulators and an electronic controller to control the four vehicle wheel ends By monitoring the deceleration rate during braking and subsequently adjusting the brake application pressure at each wheel the EC 17 controller is able to improve braking between the vehicle tire and the road surface it is on while maintaining vehicle stability The rear axle brakes are controlled independently therefore brake application pressure at an individual wheel is adjusted solely on the basis of its behavior on the road surface on which it is traveling While each steering axle brake is under the control of an individual modulator the EC 17 controller does not treat these brakes independently The EC 17 controller uses a modified individual control philosophy for the steering axle brakes This is done in order to minimize steering wheel pull in the event each wheel is traveling on a different road surface for example ice close to the curb and a dry crown Essentially the EC 17 controller con
53. tarder Note The EC 17 controller can also disable the retarder using the same S A E J1922 or S A E J1939 protocol it uses to control the traction control engine torque limiting feature For this redundant retarder disable to function the EC 17 controller must be connected to the engine control module as would be the case if the EC 17 controller is programmed for the traction control torque limiting feature The diagnostic link enables the EC 17 controller to report its operating condition to an external computer using the Bendix diagnostic communications interface hardware in response to certain commands it receives from software like Bendix ACom for Windows The EC 17 controller diagnostic link hardware conforms to S A E standard J1708 The protocol or coded language used conforms to S A E standard J1587 While connections are provided for this function it is not always used The use of the diagnostic link is essential for the servicing and reconfiguration of the EC 17N controller The diagnostic link is also used by the EC 17 controller to request additional information and to assist diagnostics and troubleshooting Windows is a registered trademark of Microsoft Corporation If the EC 17 controller is programmed for traction control It contains the following outputs Aconnection to the engine s electronic control module allows the EC 17 controller to reduce engine torque under certain circums
54. trols the braking force differences between the two brakes The wheel on dry pavement is initially given less braking force and is brought up to optimum during the stop while the wheel on ice attempts to maintain optimum braking during the entire stop In the case of vehicles equipped with tandem rear axles 6x2 6x4 the wheel speed sensors are installed at the wheels on the axle that is most likely to lock first A single modulator controls both curb side brakes on the tandem and another modulator controls both brakes on the driver s side of the tandem With this arrangement of speed sensors and modulators both brakes on one side of the tandem are treated as one since they will most likely be on the same type of road surface NON ANTILOCK BRAKE APPLICATION During normal braking air pressure from the brake valve enters the control port of the service relay valve The service relay delivers air to and through the antilock modulator located near the braked wheel and into the brake actuator The service brakes are thus applied If the wheel sensors do not detect an impending wheel lock up the EC 17 controller does not initiate any corrective action and the vehicle comes to a stop in a normal fashion ANTILOCK BRAKE APPLICATION If a service brake application is made and the wheel speed sensors detect an impending wheel lockup the EC 17 controller will immediately begin modification of the brake application using the antiloc
55. uring the self test the dash lamps will flash on and off together as indicated in the chart depending upon the type and amount of traction control configured into the EC 17 controller Note For more information on this subject see the TROUBLESHOOTING section of this document Self Configuration Process In order to successfully complete the self configuring process follow the steps presented 1 Connect all antilock and traction control wire harnesses Refer to the schematic in Figure 5 Make certain that all the speed sensors present on the vehicle are connected H2 H3 J1 J2 on the 30 pin connector and 22 F2 B2 B3 C2 on the 18 pin connector If the vehicle has an electronic engine and traction control torque limiting is desired the engine control module must be connected B2 and B3 on the 30 pin connector for J1922 or C3 D2 and D3 on the 30 pin connector for J1939 If the vehicle is equipped with either an ATR 1 or ATR 2 valve the solenoid connection must be made to the EC 17 controller D2 and D3 on the 18 pin connector in order to obtain traction control differential braking 2 If the vehicle is to be configured with traction control it must have a traction control dash lamp and a traction control enable disable switch Both the lamp and switch must be functional Turn the ignition ON toggle the traction control enable disable switch back and forth then hold a magnet on the RESET posit
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