BENDIX BW1823 User's Manual
Contents
1. 49 5 1 01 veS Pam 5515 PSLVA EUBIS 505 eoy YET Pay Uo L feubis Pam u Hry RUBIS Pym Way euBIs Wa yl mea eY UQLLUOD JQQEINPO UA H04 UQLLLIOO Wo due MAS 8 AR 88 PUNGID yams Ub days gt IL gt 95 496 JOEL 1467 11215 3 1ole npolN JOJO BUUOD 1 i 10595 99 02 5 0 830 5 491 40 39 0 49 5 1 ama 999 1431 419 LHM 40 39 03 59112913 8 1291419913 MODULATOR CONTROLLER TRAILER WIRING SCHEMATIC 13 TYPICAL MC FIGURE 5 13 Controller M 12R Modulator Remote Mount FIGURE 6 EC 13 CONTROLLER AND M 12R MODULATOR ASSEMBLY2. 3 Road test the trailer 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 The wheels should not enter a prolonged lock condition WARNING 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 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 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 If 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 equip
3. Bracket Mounted Remote EC 13 Controller 1 Disconnect the electrical connector on the vehicle wiring harness from the EC 13 controller 2 Note and mark the mounting position of the EC 13 controller assembly on the trailer Loosen remove and save the mounting hardware that attaches the EC 13 controller bracket to the trailer Remove the EC 13 controller and bracket assembly from the trailer INSTALLING EC 13 CONTROLLER ASSY Installing the EC 13 Controller and M 12 Modulator 1 After noting the positioning marks made prior to disassembly reconnect the M 12 modulator wire harness to the EC 13 controller position the gasket on the EC 13 controller then secure the EC 13 controller to the M 12 modulator using the four cap screws Torque the cap screws to 50 80 lbs in 2 Mount the assembled MC 13 modulator controller on the trailer and orient it in the position marked prior to removal 3 Reconnect all air lines 4 Reconnect the electrical connector on the vehicle wiring harness to the EC 13 controller 5 Testthe MC 13 modulator controller for operation and air leakage prior to placing the trailer in service 6 Perform the Initial Start up Procedure in the TROUBLESHOOTING section to assure proper antilock system operation INSTALLING A BRACKET MOUNTED REMOTE EC 13 CONTROLLER 1 Using the mounting hardware retained in step 2 of the removal mount the EC 13 c
4. delivers brake application pressure to the service chambers on each axle Two speed sensors on each axle report changes in acceleration and deceleration to the EC 13 controller If required the EC 13 controller adjusts the application pressure to either axle s service brakes via the modulators based on the wheel behavior reported to it by the speed sensors on each axle The EC 13 controller utilizes a SELECT SMART brake control philosophy for the trailer brakes This means that the EC 13 controller will initially adjust application pressure to the service chambers on either an axle based on the speed information from the first wheel to approach a locked condition The initial pressure adjustment will attempt to prevent either wheel on an axle from locking If a substantial braking difference is detected between two wheels on an axle the EC 13 controller will override the first air pressure adjustment and allow one wheel to lock Both wheels including the locked wheel will continue to be monitored for speed and braking difference changes that would require pressure adjustments Each of the two axles is treated independent of the other NON ANTILOCK BRAKE APPLICATION During normal braking the tractor brake valve simultaneously delivers air to the control port of the two trailer modulators The modulators function the same as standard service relay valves and apply air to the service brakes The service br
5. if it is mounted on a modulator e g M 12 modulator or is remote mounted to a trailer frame member using a bracket Use the appropriate removal procedure below Removing the EC 13 Controller and M 12 Modulator 1 Identify and remove all air lines connected to the M 12 modulator Disconnect the electrical connector on the vehicle wiring harness from the EC 13 controller Note and mark the mounting position of the MC 13 modulator controller assembly on the trailer Loosen remove and save the nuts on the mounting hardware that attaches the MC 13 modulator controller bracket to the trailer Remove the MC 13 modulator controller assembly from the trailer Remove as much contamination as possible from the exterior of the assembly making sure to keep the contamination away from the open ports Note and mark the position of the EC 13 controller relative to the M 12 modulator Remove and retain the four hex cap screws that secure the EC 13 controller to the M 12 modulator Carefully separate the EC 13 controller from the M 12 modulator enough to expose the wire harness that connects both units electrically Disconnect the wire harness by separating the four pin connector at the EC 13 controller Peel the gasket from the EC 13 controller or M 12 modulator and retain for reuse Note Use a new gasket if damaged during removal or if a new gasket is immediately available Removing
6. 2K BATTERY VOLTAGE MUST BE VEHICLE SERVICE MANUAL AND CHECK GROUND POWER BETWEEN 8 AND 17 VOLTS THE BATTERY VOLTAGE REPAIR OR REPLACE AS NECESSARY AND REPEAT THE INITIAL START UP PROCEDURE TURN IGNITION OFF RECONNECT WIRE HARNESS TO EC 13 CONTROLLER TURN IGNITION ON RESETTING 0 13 CONTROLLER PERFORM A MAGNETIC RESET BY PASSING A MAGNET OVER THE RESET IN EC 13 CONTROLLER DIAGNOSTIC WINDOW THEN REMOVE MAGNET MAGNET HERE IS THE GREEN VOLT LED STILL FLASHING OR RED ECU LED STILL ON CHECKING VOLT LED ON OR FLASHING REPEAT THE INITIAL START UP PROCEDURE REPLACE EC 13 CONTROLLER 14 Troubleshooting SECTION V PART A TESTING THE MODULATOR TURN IGNITION OFF DISCONNECT 30 PIN WIRE HARNESS CONNECTOR FROM EC 13 CONTROLLER START HERE WIRE HARNESS CONNECTOR PROBE CONNECTOR WITH VOLT OHM METER AND NOTE THAT PROPER RESISTANCE VALUES ARE OBTAINED FOR MODULATOR BEING TESTED RESISTANCE VALUES HERE FORA 2 BENDIX M 12 MODULATOR EXHAUST FRONT MODULATOR HOLD TO SOURCE 2G TO 1G READ 9 TO 12 OHMS EXHAUST TO SOURCE 2F TO 1G READ 9 TO 12 OHMS EXHAUST TO HOLD 2F TO 2G READ 18 TO 24 OHMS SOURCE TO POWER 1G TO 1K 2k NO CONTINUITY SOURCE TO GROUND 1G TO 1A 2A NO CONTINUITY REAR MODULATOR HOLD TO SOURCE 1C TO 1D READ 9 TO 12 OHMS EXHAUST TO SOURCE 1B TO 1D READ 9 TO 12 OHMS EXHAUST TO H
7. BE ADJUSTED CHECK FOR LOOSE OR WORN WHEEL BEARINGS BEFORE RE GAPPING SENSOR REFER TO VEHICLE MAINTENANCE MANUAL FOR WORN BEARINGS IF SENSOR GAP IS CORRECT CHECK WHEEL BEARING FOR FREE PLAY TO VERIFY IT COMPLIES TO MANUFACTURER S RECOMMENDATIONS LFT REAR LFT REAR MAKE CERTAIN EXCITER OR TONE RING IS IN PLACE AND INSPECT CONDITION CHECK FOR MISSING OR DAMAGED TEETH AND THAT IT TESTING SPEED SENSOR RESISTANCE RUNS TRUE AND PERPENDICULAR TO SENSOR FACE CHECK WIRING HARNESS AND CONNECTORS THAT RUN TO SENSOR F CHECK FOR DRAGGING BRAKES OVER ADJUSTED TRAPPED AIR IN ACTUATOR OUT OF ROUND DRUMS FAULTY RETURN SPRINGS PARKING BRAKE SYSTEM FAULTS ETC AND CORRECT AND RETEST EC 13 CONTROLLER WIRE HARNESS CONNECTOR 3C 3D 3H RT REAR RT REAR LFT FRONT 3J RESETTING EC 13 CONTROLLER RECONNECT EC 13 CONTROLLER TURN IGNITION ON PASS MAGNET OVER RESET ON EC 13 CONTROLLER REMOVE MAGNET AND OBSERVE LEDs MAGNET HERE ARE ANY RED LEDs ILLUMINATED GO TO SECTION INSPECTION YES FOR ILLUMINATED LEDs REPEAT THE INITIAL START UP PROCEDURE 17 Troubleshooting SECTION VI PART TESTING THE WHEEL SPEED SENSOR NO GO TO SECTION INSPEC TION FOR ILLUMINATED LED s START HERE FROM x 2 SECTION VI PART SAME LED s ILLUMINATED IGNITION OFF REMOVE 30 PIN CONNECTOR FROM EC 13 CONTROLLER MEASURE RESISTANCE BETWEEN T
8. EC 13 controller however it will light when a magnet is placed on the RESET switch in the diagnostic window FRONT LED This red LED illuminates and latches ON in order to indicate the location of a problem component its wiring will light in conjunction with either the RIGHT or LEFT LED and the SENS LED when indicating a speed sensor problem The FRONT LED will also light in conjunction with the MOD LED to indicate that the front modulator M 12 or M 12R or its wiring has malfunctioned MID LED This red LED is not used in troubleshooting the EC 13 controller and should light only when a magnet is held on the RESET switch REAR LED This red LED illuminates and latches ON in order to indicate the location of a problem component or its wiring will light in conjunction with either the RIGHT or LEFT LED and the SENS LED when indicating a speed sensor problem The REAR LED will also light in conjunction with the MOD LED to indicate that the rear modulator M 12 or its wiring has malfunctioned RIGHT LED This red LED illuminates and latches ON in order to indicate the location of a problem component its wiring will light in conjunction with either the FRONT or REAR LED and SENS LED This LED SHOULD NOT LIGHT when a MOD LED is on LEFT LED This red LED illuminates and latches ON in order to indicate the location of a problem component or its wiring will light in c
9. in the controller electronics the modulator or speed sensing areas it stores the condition in non volatile memory disables the antilock function if necessary illuminates the condition lamp and the appropriate diagnostic LEDs on the EC 13 controller The condition is truly stored and is not cleared by loss of power to the EC 13 controller The LEDs will re light when power is restored and remain illuminated until the problem is corrected After the actual problem is corrected maintenance personnel can clear or reset the EC 13 controller diagnostics by passing a small magnet over the RESET point in the diagnostics window DIAGNOSTIC LEDS There are nine LEDs plus a magnetically actuated reset switch in the EC 13 controller diagnostic window The first five LEDs locate a problem to a specific area of the trailer while the last four indicate the problem component or its wiring The LEDs are computer controlled 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 Left front is therefore the corner closest to the driver LED o FRONT Red LED LED o MID Red LED SEE NOTE BELOW LED oREAR RedLED LED oRIGHT RedLED LED oLEFT RedLED LED 0805 RedLED LED oSENS RedLED LED 0 LED oVOLT Green LED RESET NoLED NOTE The MID LED shown in the chart on the previous page is not used in the diagnostic process for the
10. will differ depending upon the type of connectors in use the trailer manufacturer and the system features in use 4 While the serial link connections 2 total are present on all EC 13 controllers they are not always used In addition several connector openings are not used PREVENTATIVE 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 13 controller incorporates a self check diagnostics the LED display should be inspected to ensure that they are functional With the tractor ignition on and a brake application held applied hold a magnet 800 gauss capable of picking up 3 ounces on the diagnostic window reset switch and note all of the LEDs illuminate If one or more of the LEDs DO NOT ILLUMINATE and the antilock condition lamp on the trailer indicates 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 jou yeyo y JOU sjeu 3 0N MC HOA 1 1044409 1 93 0 39 02 105095 01 40139 0 40 39 02 11L 09906 99 40 39 03
11. 13 controller toward an antilock system component modulator wheel speed sensor etc TYPICAL LOCATIONS FOR AMBER STATUS LAMP Troubleshooting INITIAL START UP PROCEDURE WITH TRAILER CONNECTED TO TRACTOR TURN IGNITION ON Sin hee APPLY TRAILER SERVICE BRAKES AND OBSERVE STATUS LAMP TEST FOR POWER TO THE MOUNTED ON TRAILER TRAILER AT 7 PINCONNECTOR NO lt DID STATUS LAMP ILLUMINATE ARE STOP LAMPS 5555500 ILLUMINATED YES GO TO SECTION STATUS LAMP TESTING AMBER STATUS LAMP BLINKS ONCE THEN GOES OUT SYSTEM OK STATUS LAMP DOES NOT BLINK COMES ON AND REMAINS ILLUMINATED GO TO SECTION II INSPECTION FOR ILLUMINATED LEDS STATUS LAMP COMES ON BLINKS AND GOES OUT THE SYSTEM IS FUNCTIONING NORMALLY MAKE NOTES OF THE PARTS REPLACED OR REPAIRED AND STEPS TAKEN 10 START GROUND 1 8 2A 13 CONTROLLER WIRE HARNESS CONNECTOR Troubleshooting SECTION L TRAILER STATUS LAMP TESTING WITH TRACTOR IGNITION OFF DISCONNECT 30 PIN WIRE HARNESS CONNECTOR FROM EC 13 CONTROLLER THEN TURN TRACTOR IGNITION ON AND MAKE AND HOLD A BRAKE APPLICATION USING A JUMPER WIRE CONNECT PIN 3F TO 1AAND OR 2A WITH THE CONNECTION IN PLACE NOTE THE CONDITION OF TRAILER STATUS LAMP TRAILER STATUS LAMP 3F YES TRAILER STATUS LAMP ON NO CHECK THE FOLLOWING IN THE ORDER PRESENTED AND AFTER REPLACING OR TESTING EACH C
12. EC 13 Trailer AntiLock Controller DIAGNOSTIC WINDOW FIGURE 1 EC 13 TRAILER ANTILOCK CONTROLLER DESCRIPTION GENERAL Bendix trailer antilock systems utilizing the EC 13 electronic controller assembly provide AXLE braking control for trailers By controlling wheel lock up during aggressive braking the trailer retains a high degree of stability and steerability while braking and vehicle stopping distance may be reduced In order to provide AXLE control antilock the EC 13 controller is used in combination with the following components Four individual wheel speed sensors Two M 12R remote mount modulator relay valves or a combination of one M 12 and one M 12R modulator PHYSICAL The EC 13 controller assembly electronics which regulate the function of the antilock system are contained in a die cast aluminum housing and are environmentally protected by silicone encapsulation The metal housing coupled with the design of the digital electronics is intended to provide a high degree of protection from radio and electromagnetic interference 30 PIN WIRE HARNESS CONNECTOR A diagnostics display window with 9 light emitting diodes LEDs and a magnetically actuated reset switch is incorporated in the housing for troubleshooting and diagnostic purposes A single electrical connector is currently used on the EC 13 controller for connection to the antilock system components a 30 pin P
13. ERATION COMPONENT PROBLEM The Bendix 13 controller handles equipment problems using a conservative fail safe philosophy Any single electrical problem in a component devoted to antilock braking results in simultaneous illumination of the antilock condition lamp and a troubleshooting LED on the EC 13 controller Depending upon the type of problem and its position of occurrence the EC 13 controller can continue antilock function at a lower performance level disable all of the antilock on the trailer or only a portion When antilock is disabled the brakes on the affected axle s revert to standard air braking System Parts Still Operating Yes Problem ABS Lead ABS Rear Location Ade Ade Lead Axle Rt Sensor Yes Yes Lead Axle Lft Sensor Yes Yes Rear Axle Rt Sensor Yes Yes Rear Axle Lft Sensor Yes Yes Lead Axle Modulator No Yes Rear Axle Modulator Yes No Controller No No Voltage No No If electrical power is below or above the 7 to 18 volt operating range the ABS will stop operating If voltage returns to the 8 17 volt range the ABS is restored A problem in a single speed sensor will not result in disabling of the antilock system If a speed sensor problem is detected by the EC 13 controller the remaining speed sensor on the axle will be used to continue antilock operation on the axle but at a slightly degraded level of performance With the failed component approach described the antilock system
14. HE APPROPRIATE SPEED SIGNAL PINS ON THE CONNECTOR RESISTANCE FOR BENDIX WS 20 SENSOR IS BETWEEN 1500 2500 OHMS REFER TO VEHICLE MANUAL FOR THE RE EC 13 CONTROLLER WIRE SISTANCE VALUES IF OTHER THAN WS 20 SENSOR IS IN USE HARNESS CONNECTOR 3C 3D 3H RT REAR RT REAR LFT FRONT 3J LFT FRONT REPLACE THE EC 13 CONTROLLER 3K CORRECT RESISTANCE RT FRONT 2H RT FRONT 20 DISCONNECT CONNECTOR SPEED SENSOR INSPECT LFT REAR LFT REAR THE CONNECTOR THEN CHECK THE RESISTANCE BETWEEN TWO PINS ON SENSOR RESISTANCE BETWEEN REPLACE THE SENSOR 1500 2500 OHMS FOR THE BENDIX WS 20 SENSOR RESETTING 13 CONTROLLER SPEED SENSOR AND EC 13 CONTROLLER PASS MAGNET OVER RESET ON EC 13 CONTROLLER REMOVE MAGNET AND OBSERVE LEDs MAGNET HERE REPEAT THE INITIAL START UP PROCEDURE ARE ANY LED s ILLUMINATED GO TO SECTION III INSPECTION FOR ILLUMINATED LED s ARE SAME RED LEDS ILLUMINATED REPAIR OR REPLACE SPEED SENSOR WIRING HARNESS AND REPEAT THE INITIAL START UP PROCEDURE 18 19 20 BW1823 2007 Bendix Commercial Vehicle Systems LLC All rights reserved 8 07 Printed in U S A
15. NG ON AND PASS MAGNET OVER 0 13 56 14 CONTROLLER CONTROLLER AND REMOVE NOTE REACTION OF RED LEDS ARE ANY RED LEDs ILLUMINATED YES ARE THE SAME RED LEDs ILLUMINATED MAGNET HERE REPEAT THE INITIAL START UP PROCEDURE REPLACE THE EC 13 CONTROLLER GO TO SECTION INSPECTION FOR ILLUMINATED LEDs Troubleshooting SECTION VI PART TESTING THE WHEEL SPEED SENSOR PASS MAGNET OVER RESET ON YES START HERE EC 13 CONTROLLER REMOVE ANY RED LED s ON MAGNET AND OBSERVE THE LEDs GO TO SECTION VI PART B AND BEGIN TESTING RESETTING EC 13 CONTROLLER MAGNET HERE TURN IGNITION OFF AND CHECK FOLLOWING A REMOVE CONNECTOR S FROM EC 13 CONTROLLER AND MEASURE RESISTANCE BETWEEN APPROPRIATE SPEED SENSOR SIGNAL AND SIGNAL RETURN RESISTANCE FOR BENDIX WS 20 SPEED SENSOR SHOULD BE BETWEEN 1500 2500 OHMS REFER TO VEHICLE MAINTENANCE MANUAL IF OTHER THAN THE WS 20 SENSOR IS IN USE IF RESISTANCE NOT CORRECT DISCONNECT CONNECTOR AT SPEED SENSOR INSPECT CONNECTOR THEN CHECK RESISTANCE BETWEEN PINS ON SENSOR IF RESISTANCE IS NOT CORRECT LFT FRONT BETWEEN 1500 2500 OHMS FOR THE BENDIX WS 20 SENSOR REPLACE SENSOR OTHERWISE PROCEED TO STEP B 3K RT FRONT CHECK GAP BETWEEN SPEED SENSOR AND EXCITER OR TONE 2H RING GAP FOR BENDIX WS 20 SPEED SENDER IS BETWEEN 0 015 RT FRONT INCHES IF SENSOR GAP MUST
16. OLD 1B TO 10 READ 18 TO 24 OHMS SOURCE TO POWER 1D TO 1K 2k NO CONTINUITY SOURCE TO GROUND 1D TO 1A 2A NO CONTINUITY ARE RESISTANCE GO TO SECTION V BAND VALUES CORRECT CONTINUE TESTING INSPECT CONNECTOR AND RECONNECT TO EC 13 CONTROLLER TURN IGNITION ON AND PASS MAGNET OVER RESET ON 50 13 CONTROLLER REMOVE MAGNET AND NOTE REACTION OF RED LEDS ARE ANY RED LED s ILLUMINATED SAME RED LED s ILLUMINATED 1B 1 10 1G RESETTING 0 13 CONTROLLER MAGNET HERE REPEAT INITIAL START UP PROCEDURE IF TESTING HAS RETURNED THIS STEP TWICE REPLACE THE EC 13 CONTROLLER YES REPLACE 13 CONTROLLER GOTO SECTION INSPECTION FOR ILLUMINATED LEDS AND RETEST IF FAILURE PERSISTS REPLACE THE 13 CONTROLLER 15 Troubleshooting SECTION V PART B TESTING THE MODULATOR TURN THE IGNITION OFF DISCONNECT THE MODULATOR M 12 OR M 12R CONNECTOR FROM THE VEHICLE WIRE HARNESS TO EXPOSE THE THREE PIN CONNECTOR LEADING TO THE M 12 MODULATOR AND TEST RESISTANCE BETWEEN THE PINS ON THE MODULATOR CONNECTOR START HERE RED TO BLACK 12 OHMS RED TO WHITE 9 TO 12 OHMS BLACK WHITE 4 RESISTANCE IN RANGE REPLACE M 12 MODULATOR ASSEMBLY M 12 MODULATOR WIRE HARNESS CONNECTOR RECONNECT EC 13 CONTROLLER TO M 12 MODULATOR TURN IGNITION RESETTI
17. OMPONENT TEST THE STATUS LAMP OPERATION 1 CHANGE TRAILER STATUS LAMP BULB 2 CHECK TRAILER STATUS LAMP WIRING GROUND 3 CHECK CONTINUITY OF WARNING WIRE BETWEEN PIN 3F ON THE 30 PINCONNECTOR AND THE TRAILER STATUS LAMP SOCKET REPEAT THE INITIAL START UP PROCEDURE REPLACE EC 13 CON TROLLER AND RETEST 11 START HERE CHECKING VOLT LED GO TO SECTION IV TESTING FOR POWER TO THE EC 13 CONTROLLER 12 Troubleshooting SECTION INSPECTION FOR ILLUMINATED LED s WITH TRACTOR IGNITION ON AND BRAKES HELD APPLIED INSPECT EC 13 CONTROLLER FOR PRESENCE OF ILLUMINATED LEDS AND RECORD NO IS GREEN VOLT LED ILLUMINATED YES YES LED s ILLUMINATED ON FLASHING YES IS GREEN LED FLASHING NO ARE ANY RED LED s ILLUMINATED NO YES NOTE AND RECORD THE CONDITION OF ALL RED LEDS GO TO SECTION III INSPECTION FOR ILLUMINATED LEDS ARE ANY RED GO TO SECTION IV TESTING FOR POWER TO THE 13 CONTROLLER REPLACE THE EC 13 CONTROLLER GO TO SECTION TRAILER STATUS LAMP TESTING RED LEDs ANY ILLUMINATED Troubleshooting SECTION Ill INSPECTION FOR ILLUMINATED LEDS NOTE RED ECU LED IN EC 13 CONTROLLER START HERE INSPECTING ECU DIAGNOSTICS WINDOW LED GO TO SECTION IV TESTING FOR POWER TO THE 50 43 CONTROLLER SEE NOTE 1 NO
18. TESTING SENS LED SEE NOTE 1 ON IS THE RED RIGHT IS THE RED FRONT NOTE THE THREE YES YES ICLUMINATED ILLUMINATED ILLUMINATED GOTOSECTION _ NOTE 1 BELOW NOTE 1 BELOW TESTING THE WHEEL SPEED SENSOR NO NO REPLACE THE 13 NO CONTROLLER AND REPEAT THE INITIAL START UP PROCEDURE YES NO YES 5 7 _ IS RED MOD LED IS THE RED FRONT yeg GO TO SECTION V ILLUMINATED OR LEFI LED OR REAR LED TESTING THE ILLUMINATED ILLUMINATED MODULATOR SEE NOTE 2 BELOW SEE NOTE 1 BELOW SEE NOTE 1 SEE NOTE 2 ON NO TESTING MOD LED IF ANY OTHER RED LEDs ARE ILLUMINATED REPLACE THE EC 13 CONTROLLER AND REPEAT THE INITIAL NOTES 1 IF BOTH OF THESE LEDs ARE ILLUMINATED REPLACE THE EC 13 CONTROLLER 2 IF EITHER OF THESE LEDs ARE ILLUMINATED REPLACE THE EC 13 CONTROLLER 13 Troubleshooting SECTION IV TESTING FOR POWER TO THE 13 CONTROLLER TURN IGNITION OFF DISCONNECT WIRE HARNESS CONNECTOR FROM EC 13 START HERE CONTROLLER TURN IGNITION ON MAKE amp HOLD A BRAKE APPLICATION AND MEASURE VOLTAGE BETWEEN POWER AND GROUND PINS ON WIRE HARNESS CONNECTOR 1ATO 1K 1ATO 2K 2ATO 1K 2A TO 2K WIRE HARNESS CONNECTOR RECONNECT CONNECTOR TO EC 13 CONTROLLER CHECK THE VEHICLE VOLTAGE SAME AS NO WIRING FOR CONTINUITY REFER TO THE 1 2A 1K
19. ackard Electric 150 series pack MOUNTING The EC 13 controller can be remote bracket mounted to a frame member or can be mounted directly on a modulator relay valve assembly such as the Bendix M 12 modulator reference SD 13 4772 When the EC 13 controller is mounted on a modulator assembly the resulting assembly receives a different designation For example when the EC 13 antilock controller is mounted on the M 12 modulator the resulting assembly i e EC 13 controller plus M 12 modulator is known as a MC 13 modulator controller see Figure 3 When the EC 13 controller is bracket mounted to a frame member and not mounted on the modulator an M 12R modulator is used The M 12R modulator is identical to the M 12 modulator but has remote mounting capabilities see Figure 6 SPRING BRAKE 6 CONTROL SERVICE LINE 15 207 WHEEL SPEED SENSOR M 12R 6 13 MODULATOR CONTROLLER 2 n p x 2 LITA gt 1 SUPPLY EMERGENCY LINE 5 5 TRAILER ELECTRICAL CONNECTOR SPRING BRAKE TRAILER ANTILOCK WIRING HARNESS FIGURE 2 TYPICAL 50 13 TRAILER ANTILOCK SYSTEM EC 13 CONTROLLER INFORMATION INPUTS AND COMMAND OUTPUTS GENERAL The EC 13 controller receives information from several components in the antilock system
20. akes are thus applied If the speed sensors do not detect an impending wheel lock up the EC 13 controller does not initiate any corrective action and the trailer comes a stop in normal fashion ANTILOCK CONTROLLED BRAKE APPLICATION SYSTEM FULLY OPERATIONAL If a service brake application is made and the speed sensors detect an impending wheel lockup on an axle the EC 13 controller will immediately begin modification of the brake application using the antilock modulators at the affected axle s Solenoid valves contained the modulator are energized de energized by the EC 13 controller in order to modify the brake application When a solenoid coil is energized its shuttle moves and depending upon the function of the specific solenoid it either opens or closes thereby causing the exhaust or re application of air pressure to the relay valve portion of the modulator and to the brake actuators connected The solenoids in either the M 12 or M 12R modulator are controlled independently by the EC 13 controller By opening and closing the solenoid valves in the appropriate modulator the EC 13 controller is actually simulating what the driver does when he pumps the brakes It must be remembered however that unlike the driver the EC 13 controller is able to pump brakes on either the front or rear axle s or both independently and with far greater speed and accuracy ANTILOCK SYSTEM OP
21. and based on these inputs issues commands or delivers information Some portions of the EC 13 controller both receive and deliver commands and information INPUTS Wheel speed information is provided to the EC 13 controller via a wiring harness from individual speed sensors located in the trailer wheels or axle housing Working in conjunction with an exciter or tone ring the speed sensors provide information to the EC 13 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 13 controller is designed to receive wheel speed information from various wheel speed sensor models at the rate of 100 pulses per wheel revolution The EC 13 controller is able to simultaneously receive and individually interpret speed signals from four wheel speed sensors 2 axles 30 PIN CONTROLLER CONNECTOR WY VY k oom 5 20 2 WHEEL SPEED SENSOR Z COIS Vehicle power is supplied to the EC 13 controller from the stop light switch The electrical ground for the EC 13 controller is from the 7 pin trailer connector and trailer chassis OUTPUTS Modulators like the Bendix M 12 and M 12R modulators are the means by which the EC 13 antilock controller is able to modify driver applied air pressure to the service brakes The EC 13 controller is able to simu
22. his LED may also flash indicating that a marginal low voltage condition existed at the time of an antilock event RESET Beneath the RESET area of the window 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 Holding a magnet against the RESET will cause all LEDs to light during the time the magnet is against it TROUBLESHOOTING GENERAL While the EC 13 controller diagnostic display locates a specific problem area it is still necessary to confirm whether the problem resides in the component itself or the wiring Basically the troubleshooting procedure that follows is devoted to narrowing the problem to either the wiring or a specific antilock component It should be noted that ALL TROUBLESHOOTING BEGINS BY OBSERVING THE ANTILOCK STATUS LAMP ON THE TRAILER WHILE PERFORMING THE INITIAL START UP PROCEDURE and following the directions contained in the procedure IMPORTANT TROUBLESHOOTING TIPS 1 Record all findings and the action taken during the troubleshooting process The record sheet should be filed in the trailer maintenance folder for future reference and comparison 2 No voltage or resistance tests are performed into the EC 13 controller All voltage and resistance tests are performed by beginning at the wire harness half of the connector and moving AWAY from the EC
23. ltaneously and independently control two modulators assemblies The M 12 and M 12R modulators are combination valves consisting of a standard relay valve and solenoid assembly They replace the standard relay valves used to speed up the application and release of the trailer s rear axle brakes An external three pin wiring harness connects the EC 13 controller to the M 12 or M 12R modulator solenoid assembly For additional information and service procedures see Bendix Service Data Sheet SD 13 4772 As stated previously the EC 13 controller is designed to control two modulators It can be mounted directly on an M 12 modulator relay valve assembly and control separate M 12R modulator or the EC 13 controller can itself be remote mounted to the trailer and control two M 12R modulators When mounted directly on a modulator the two separate components EC 13 controller and M 12 modulator become a single assembly called the MC 13 modulator controller 13 Controller M 12 Modulator FIGURE 3 TYPICAL MC 13 MODULATOR CONTROLLER 13 CONTROLLER amp M 12 MODULATOR Connected to the EC 13 controller via a wire harness the modulator is essentially a high capacity on off air valve that incorporates a pair of electrical solenoids for control The solenoids provide the electric air link between the antilock controller electronics and the air brake system An optional indicat
24. onjunction with either the FRONT or REAR LED and SENS LED This LED SHOULD NOT LIGHT when a MOD LED is on MOD LED This red LED illuminates and latches ON to indicate a permanent or intermittent open or short circuit in the solenoids of one of the two modulators or the wiring connecting them to the system The MOD LED will illuminate in conjunction with either the FRONT or REAR LED SENS LED This red LED illuminates and latches ON to indicate permanent or intermittent problem The failures indicated are open or shorted wheel speed sensor open or shorted wheel speed sensor wiring wheel speed signal not present or does not conform to design criteria The SENS LED will illuminate in conjunction with either the FRONT or REAR and either the RIGHT or LEFT LED ECU LED This red LED when illuminated indicates that the controller itself has failed It is latched ON for all EC 13 controller failures except low voltage For voltages less than 6 vdc the LED illuminates to indicate the controller is inoperative however when the voltage again exceeds 6 vdc the LED will go OUT by itself VOLT LED This green LED illuminates and remains ON during trailer operation to indicate that vehicle power is reaching the controller LED ON only when brake application is made If vehicle power is out of range for proper operation below 7 or above 18 this LED will flash until power is brought into range T
25. ontroller in the position noted during removal 2 Reconnect the electrical connector on the vehicle wiring harness to the EC 13 controller DIAGNOSING AND LOCATING A SYSTEM PROBLEM GENERAL EC 13 controller contains self test and diagnostic circuitry that continuously checks for proper operation of the entire antilock system including wiring continuity An optional condition lamp controlled by the EC 13 controller advises the driver of the condition of the entire antilock system The condition of specific antilock components is provided to the mechanic by a series of labeled light emitting diodes LEDs displayed through a window in the EC 13 controller housing No special tools or equipment are needed to read or interpret the EC 13 controller diagnostics window It should be noted that the diagnostics display is separate from the antilock condition lamp on the trailer With this separation the driver is aware of any 5 e 9 2 lt 0 37 Controller Controller Diagnostic Window FIGURE 7 13 CONTROLLER DIAGNOSTIC WINDOW problems that occur but is not confused by the diagnostic information A special feature of the EC 13 controller diagnostic system is its problem indication latching Intermittent problems particularly in the wheel speed sensing area can be difficult to diagnose When the controller senses an erroneous condition whether
26. or light can be connected to and controlled by the EC 13 controller and serves as a means of advising the driver of the condition of the antilock system The data link function enables the EC 13 controller to report its operating condition to a specialized external computer in response to certain commands it receives The EC 13 controller data link configuration conforms to S A E standard J1708 and the protocol or coded language used conforms to S A E standard J1587 There are two connections to the EC 13 controller devoted to the data link While the EC 13 controller is capable of this function and connections are provided it is not always used Use of the data link is not essential for the EC 13 controller to be functional WS 20 Speed Sensor Straight Configuration WS 20 Speed Sensor 90 Degree Configuration FIGURE 4 WS 20 WHEEL SPEED SENSORS OPERATION OPERATIONAL PHILOSOPHY The Bendix EC 13 controller provides axle braking control by using four speed sensors and two modulators By monitoring the rate of deceleration during braking and subsequently adjusting the brake application pressure to each axle the EC 13 controller is able to provide improved braking while maintaining trailer stability The trailer s rear axle brakes are controlled by the EC 13 controller and two modulators M 12 or M 12R Like the standard service relay valve it replaces the modulator
27. ped with an AD IS air dryer system or a dryer reservoir module be sure to drain the purge reservoir Following the vehicle manufacturer s recommended procedures deactivate the electrical system a manner that safely removes all electrical power from the vehicle 10 11 Never exceed manufacturer s recommended pressures 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 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 Componenis 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 Prior to returning the vehicle to service make certain all components and systems are restored to their proper operating condition For vehicles with Antilock 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 EC 13 CONTROLLER ASSY Locate the EC 13 controller on the trailer and determine
28. will attempt to provide the trailer with the best possible braking and stability even after a problem has occurred It should be remembered that the driver will be advised of any degraded antilock operation via the condition lamp and that standard air braking will still be available on those brakes where the antilock has been disabled ANTILOCK WIRING GENERAL NOTES The wires that carry information and power into and out of the EC 13 controller are grouped and terminate at a 30 pin Packard connector which plugs into the EC 13 controller The wiring harnesses and connectors are weather proof 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 15 generally advisable to replace wire harness rather than repair individual wires in the harness If a splice repair must be made it is important that the splice be properly soldered with a rosin flux not acid based and the splice 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 s Do not overstress sockets 3 Always check the vehicle hand book for wire and connector identification Individual wire identification
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