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BENDIX EC-15 ANTILOCK CONTROLLER ASSY, Manual

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BENDIX EC-15 ANTILOCK CONTROLLER ASSY Manual Download Page 14

14

DISCONNECT WIRE HARNESS CONNECTOR
FROM EC-15

™

 CONTROLLER (FRONT

CONNECTOR ONLY IN FIGURE 7) AND OBSERVE
THE DASH LAMP.

START HERE

WITH IGNITION ON, MEASURE VOLTAGE BETWEEN
LAMP RELAY AND GROUND. VOLTAGE SHOULD BE SAME
AS BATTERY VOLTAGE (SEE FIGURES 7 AND 8)

DASH LAMP ILLUMINATED?

REPLACE THE EC-15

™

CONTROLLER

REPLACE FUSE
AND/OR REPAIR OR
REPLACE WIRE
HARNESS

CHECK WIRING HARNESS AND RELAY FOR
SHORTS TO GROUND. RECONNECT AND
CHECK/REPLACE THE FOLLOWING:
1. DASH LIGHT BULB
2. RELAY POWER WIRE
3. RELAY
AFTER REPLACING EACH COMPONENT TEST
THE DASH LAMP

IS VOLTAGE CORRECT?

NO

REPEAT THE “INITIAL
START-UP PROCEDURE”.

TROUBLESHOOTING

SECTION I - DASH LAMP TESTING

YES

NO

YES

Summary of Contents for EC-15 ANTILOCK CONTROLLER ASSY

Page 1: ...r individual wheel speed sensors Four air pressure modulator valves Antilock condition lamp dash mounted PHYSICAL The EC 15 controller electronics that regulate the function of the antilock system are contained in a die cast aluminum housing and are environmentally protected The metal housing coupled with the design of the digital electronics is intended to provide a high degree of protection from...

Page 2: ... LAMP RELAY RETARDER CONTROL M 21 MODULATOR 4 FRONT AXLE SERVICE CHAMBER QUICK RELEASE VALVE SERIAL LINK EXCITER 4 WHEEL SPEED SENSOR SERVICE BRAKE VALVE EC 15 CONTROLLER CR 15 ASSEMBLY AR 1 ANTILOCK RELAY TANDEM AXLE REAR AXLE SERVICE ACTUATOR ...

Page 3: ... controller both receive and deliver commands and information INPUTS Wheel speed information is provided to the EC 15 controller via a wiring harness from individual wheel speed sensors located at or in the vehicle wheels Working in conjunction with an exciter or tone ring wheel speed sensors provide information to the EC 15 controller in the form of an AC signal which varies in voltage and freque...

Page 4: ...1587 There are two connections to the EC 15 controller devoted to the data link While the EC 15 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 15 controller to be functional OPERATION GENERAL The Bendix EC 15 antilock controller system provides individual wheel control by using a wheel speed sensor and modu...

Page 5: ...l sensors do not detect an impending wheel lock up the EC 15 controller does not initiate any corrective action and the vehicle comes to a stop in a normal fashion ANTILOCK CONTROLLED BRAKE APPLICATION SYSTEM FULLY OPERATIONAL If a service brake application is made and the wheel speed sensors detect an impending wheel lockup the EC 15 controller will immediately begin modification of the brake app...

Page 6: ...lt in complete disabling of the antilock system and reversion to standard braking on all wheels Two or more failures regardless of their position of occurrence will also result in the disabling of the entire system With the failed component approach described the vehicle will retain improved braking stability after a single failure It should be remembered that the driver will be advised of the deg...

Page 7: ...the recommended procedures Use only the proper tools and observe all precautions pertaining to use of those tools 4 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 equipped with an AD IS air dryer system or a dryer reservoir...

Page 8: ... LEFT FRONT SPEED SIGNAL RETURN 1B RETARDER DISABLE 1C RIGHT FRONT MODULATOR EXHAUST 1A RIGHT FRONT MODULATOR HOLD 1D RIGHT FRONT MODULATOR SOURCE 1H RIGHT FRONT SPEED SIGNAL 1L RIGHT FRONT SPEED SIGNAL RETURN 2K LEFT REAR SPEED SIGNAL 2G LEFT REAR SPEED SIGNAL RETURN 2A LEFT REAR MODULATOR EXHAUST 2C LEFT REAR MODULATOR HOLD 2D LEFT REAR MODULATOR SOURCE 2M RIGHT REAR SPEED SIGNAL 2L RIGHT REAR S...

Page 9: ...FRONT MODULATOR EXHAUST 1J RIGHT FRONT MODULATOR HOLD 1F RIGHT FRONT MODULATOR SOURCE 2H RIGHT FRONT SPEED SIGNAL 3K RIGHT FRONT SPEED SIGNAL RETURN 3E LEFT REAR SPEED SIGNAL 2C LEFT REAR SPEED SIGNAL RETURN 1B LEFT REAR MODULATOR EXHAUST 1C LEFT REAR MODULATOR HOLD 1D LEFT REAR MODULATOR SOURCE 3D RIGHT REAR SPEED SIGNAL 3C RIGHT REAR SPEED SIGNAL RETURN 2D RIGHT REAR MODULATOR EXHAUST 2E RIGHT R...

Page 10: ...er operation of the entire antilock system including wiring continuity Adash lamp controlled by the EC 15 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 LED s displayed through a window in the EC 15 controller housing No special tools or equipment are...

Page 11: ... the FRONT or REAR LED and the MOD or SENS LED 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 four modulators or the wiring connecting it to the system SENS LED This Red LED illuminates and latches ON to indicate permanent or intermittent failure The failures indicated are open or shorted wheel speed sens...

Page 12: ...ing begins by observing the antilock condition lamp on the dash Troubleshooting should begin by first performing the Initial Start up Procedure and following the directions contains in it 2 The troubleshooting technician should record all findings and the action taken during the troubleshooting process 3 No voltage or resistance tests are performed into the EC 15 controller All voltage and resista...

Page 13: ...ON FOR ILLUMINATED LED S DASH LAMP FLASHES AND COMES ON AND STAYS ON INCREASE VEHICLE SPEED TO ABOVE 10 MPH FOR AT LEAST 30 SECONDS AND OBSERVE THE DASH LAMP DASH LAMP REMAINS ON NO GO TO SECTION III INSPECTION FOR ILLUMINATED LED S THE SYSTEM IS FUNCTIONING NORMALLY MAKE NOTES OF THE PARTS REPLACED OR REPAIREDAND STEPSTAKEN ONTHETROUBLE SHOOTINGSHEET TROUBLESHOOTING INITIAL START UPPROCEDURE YES ...

Page 14: ...TAGE SEE FIGURES 7 AND 8 DASH LAMP ILLUMINATED REPLACE THE EC 15 CONTROLLER REPLACE FUSE AND OR REPAIR OR REPLACE WIRE HARNESS CHECK WIRING HARNESSAND RELAY FOR SHORTS TO GROUND RECONNECTAND CHECK REPLACE THE FOLLOWING 1 DASH LIGHT BULB 2 RELAY POWER WIRE 3 RELAY AFTER REPLACING EACH COMPONENT TEST THE DASH LAMP IS VOLTAGE CORRECT NO REPEATTHE INITIAL START UP PROCEDURE TROUBLESHOOTING SECTION I D...

Page 15: ... LEDS ILLUMINATED GO TO SECTION V TESTING FOR POWER TO THE EC 15 CONTROLLER ARE ANY RED LED S ILLUMINATED CHECK CLOSELY AND NOTE IF GREEN LED IS ILLUMINATED INSPECT EC 15 CONTROLLERFOR PRESENCE OF ILLUMINATED LEDS AND RECORD GO TO SECTION V TESTING FOR POWER TO THE EC 15 CONTROLLER GO TO SECTION VIII TESTING FOR FALSE FAILURE INDICATION CAUSED BY DASH LAMP RELAY REPLACE THE EC 15 CONTROLLER IS GRE...

Page 16: ...D LEDS ILLUMINATED ARE ANY RED LED S ILLUMINATED IS GREEN VOLT LED ILLUMINATED INSPECT THE EC 15 CONTROLLER FOR PRESENCE OF ILLUMINATED LEDS AND RECORD GO TO SECTION V TESTING FOR POWER TO THE EC 15 CONTROLLER GO TO SECTION IX TESTING FOR FALSE FAILURE INDICATION CAUSED BY WHEEL SPEED COMPONENTS REPLACE THE EC 15 CONTROLLER IS GREEN LED FLASHING NO YES YES GO TO SECTION IV INSPECTION FOR ILLUMINAT...

Page 17: ...ING THE MODULATOR AND TESTTHE APPROPRIATE MODULATOR REPLACE THE EC 15 CONTROLLER AND REPEATTHE INITIALSTART UP PROCEDURE DO THE ABOVE CONDITIONS EXIST YES THEREMUSTBEAMINIMUMOFTHREERED LEDS ILLUMINATED AND OF THE THREE THERE MUSTBEA RIGHT OR LEFT PLUS A FRONT OR REAR PLUS A MOD OR SENS IS THIS LED ILLUMINATED NOTE RED ECU LED IN EC 15 CONTROLLER DIAGNOSTICS WINDOW NO YES NO NOTE THE THREE ILLUMINA...

Page 18: ... SERVICE MANUALAND CHECK THE BATTERY VOLTAGE REPAIR OR REPLACE AS NECESSARY AND REPEATTHE INITIALSTART UP PROCEDURE VOLTAGE SAMEAS BATTERY VOLTAGE MUST BE BETWEEN 11 AND 17 VOLTS TURN IGNITION ONAND MEASURE VOLTAGE BETWEEN BATTERYAND GROUND PINS ON WIRE HARNESS CONNECTOR SEE FIGURES 7AND 8 TROUBLESHOOTING SECTION V TESTING FOR POWER TO THE EC 15 CONTROLLER STARTHERE YES NO REPEATTHE INITIALSTART U...

Page 19: ...TO 5 OHMS EXHAUST TO HOLD READ 7 TO 10 OHMS SOURCE TO BATTERY POWER NOCONTINUITY SOURCE TO GROUND NOCONTINUITY NOTE SOURCE TO BATTERYTEST NOT REQUIRED FOR CONNECTOR 2 REAR DEUTSCH CONNECTOR FIGURE 7 TESTREAR MODULATOR ON OPPOSITE SIDE OF VEHICLE GO TO BEGINNING THIS SECTION VI AND RETEST TURN IGNITION OFF REFER TO FIGURES 7AND 8 DISCONNECT WIRE HARNESS CONNECTOR FROM EC 15 CONTROLLER YES FRONT OR ...

Page 20: ...GROUNDAND NOTE NO CONTINUITY RECONNECTCONNECTORTO MODULATOR TURN IGNITION ONAND PASS MAGNET OVER RESET ON EC 15 CONTROLLER NOTE REACTION OF RED LEDS ARE ANY RED LED S ILLUMINATED RESISTANCE READINGS CORRECT START HERE FROM SECTION VI A REPLACETHE MODULATOR NO YES GO TO SECTION IV INSPECTION FOR ILLUMINATED LEDS AND RETEST REPAIR OR REPLACE MODULATOR WIRE HARNESS SAME RED LED S ILLUMINATED REPEAT T...

Page 21: ...BEFORE RE GAPPING SENSOR REFER TO VEHICLE MAINTENANCE MANUAL FOR WORN BEARINGS C IF SENSOR GAP IS CORRECT CHECK WHEEL BEARING FOR FREE PLAY TO VERIFY IT COMPLIES TO MANUFACTURER S RECOMMENDATIONS D MAKE CERTAIN EXCITER OR TONE RING IS IN PLACEAND INSPECT CONDITION CHECK FOR MISSING OR DAMAGED TEETHAND THAT IT RUNS TRUEAND PERPENDICULAR TO SENSOR FACE E CHECK WIRING HARNESS AND CONNECTORS THAT RUN ...

Page 22: ...WEEN 1500 2500 OHMS FOR THE BENDIX WS 20 SPEED SENSOR REPLACE THE SENSOR YES REPLACE EC 15 CONTROLLER NO TROUBLESHOOTING SECTION VI PART B TESTING THE WHEEL SPEED SENSOR AREANY LED S ILLUMINATED CORRECT RESISTANCE START HERE FROM SECTION VII PART A NO YES GO TO SECTION III INSPECTION FOR ILLUMINATED LEDS REPAIR OR REPLACE SPEED SENSOR WIRING HARNESS ARE SAME RED LED S ILLUMINATED REPEATTHE INITIAL...

Page 23: ...ARNESS CONNECTOR SEE FIG 7 8 AND TERMINAL ON LAMP RELAY YES GROUNDTHIS WIREAT EC 15 CONTROLLER CONNECTOR DASH LAMP OFF TO EC 15 CONTROLLER CONNECTOR NO LAMP ON CONTINUE TESTING REPLACE EC 15 CONTROLLER IS CONTINUITY DETECTED REPAIR OR REPLACE WIRE HARNESS RECONNECT EC 15 CONTROLLER WIRE HARNESSAND REPEAT THE INITIAL START UP PROCEDURE CHECK FOR POWER HERE IS POWER DETECTED AREALL LEDS ILLUMINATED ...

Page 24: ...RY YES HOLDAMAGNET ON RESET OF EC 15 CONTROLLERAND NOTE LEDS NO RUN VEHICLEAT 10 MPH OR MORE FOR 30 SECONDS OR MORE TURN OFF IGNITION REPLACE EC 15 CONTROLLER AREALL LEDS ILLUMINATED REMOVEMAGNET REPEAT INITIAL START UP PROCEDURE TROUBLESHOOTING SECTION IX TESTING FOR FALSE INDICATION CAUSED BY WHEEL SPEED COMPONENTS STARTHERE BW1663 2004 Bendix Commercial Vehicle Systems LLC All rights reserved 5...

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