1®Bendix® EC-15™ AntiLock Controller AssemblySD-13-4785FIGURE 1 - EC-15™ ELECTRONIC CONTROLLERDIAGNOSTICSWINDOW DISPLAYMOUNTINGHOLES (4)DESCRIPTIONGEN

10BRACKET MOUNTED EC-15™ CONTROLLER1. Disconnect the electrical connector(s) from the EC-15™controller.2. Note and mark the mounting position of the E

11LED o FRONT Red LEDLED o MID Red LED (SEE NOTE BELOW)LED o REAR Red LEDLED o RIGHT Red LEDLED o LEFT Red LEDLED o MOD Red LEDLED o SENS Red LEDLED o

12TROUBLESHOOTINGGENERALWhile the EC-15™ controller diagnostic display locates aspecific problem area, it is still necessary to confirm whetherthe pro

13TURN VEHICLE IGNITION ON.OBSERVE DASH ANTILOCKCONDITION LAMP.START HEREDASH LAMP DOES NOT BLINK, IT COMESON AND REMAINS ON.IS DASH LAMP ILLUMINATED?

14DISCONNECT WIRE HARNESS CONNECTORFROM EC-15™ CONTROLLER (FRONTCONNECTOR ONLY IN FIGURE 7) AND OBSERVETHE DASH LAMP.START HEREWITH IGNITION ON, MEASU

15TROUBLESHOOTINGSECTION II - INSPECTION FOR ILLUMINATED LEDSSTART HEREYES (ON)YESYESYESNO (OFF)NONONOGO TO SECTION IV“INSPECTION FORILLUMINATED LEDS”

16TROUBLESHOOTINGSECTION III - INSPECTION FOR ILLUMINATED LED’SSTART HEREYESYESNONONOGO TO SECTIONV “TESTING FORPOWER TO THEEC-15™CONTROLLER”.NOTE AND

17GO TO SECTION V “TESTINGFOR POWER TO THE EC-15™CONTROLLER”.USING THE TWO POSITIONING LEDS(RIGHT/LEFT FRONT/REAR) GO TOSECTION VIIA “TESTING THE WHEE

18TURN IGNITION OFF, REFER TO FIGURES 7AND 8, DISCONNECT WIRE HARNESSCONNECTOR FROM EC-15™ CONTROLLER(FRONT CONNECTOR ONLY IN FIGURE 7)RECONNECT CONNE

19ARE RESISTANCEVALUES CORRECT?REPEAT “INITIAL START-UPPROCEDURE”. IF THISTEST STEP HAS REPEATEDTWICE - REPLACE THEEC-15™ CONTROLLER.INSPECT CONNECTOR

2FIGURE 2 - EC-15™/CR-15™ ANTILOCK SYSTEMDASH LAMPRELAYRETARDERCONTROLM-21™MODULATOR(4)FRONT AXLESERVICECHAMBERQUICKRELEASE VALVESERIAL LINKEXCITER (4

20GO TO MODULATOR, INSPECT WIRING CONNECTOR.DISCONNECT CONNECTOR AND TEST RESISTANCEBETWEEN PINS ON MODULATOR, RESISTANCE VALUESFOR BENDIX® M-21™ MODU

21ARE ANY RED LED’S ILLUMINATED?GO TO SECTION III -“INSPECTION FORILLUMINATED LED’S.”TURN IGNITION OFF AND CHECK FOLLOWING:A. REMOVE CONNECTOR(S) FROM

22IGNITION OFF. REMOVE CONNECTOR(S) FROM EC-15™CONTROLLER. MEASURE RESISTANCE BETWEEN THEAPPROPRIATE SPEED SIGNAL (+) AND SIGNAL RETURN (-).RESISTANCE

23REMOVE MAGNET FROM EC-15™ CONTROLLER, TURNIGNITION OFF AND DISCONNECT THE WIRING HARNESSCONNECTOR(S) FROM EC-15™ CONTROLLER. TURNIGNITION ON, GROUND

24TURN IGNITION OFF AND INSPECTAPPROPRIATE AXLE AND WHEEL FORPRESENCE OF AN EXCITER OR TONERING AND SPEED SENSOR. CHECK THESENSOR “GAP” (DISTANCE BETW

3FIGURE 3 - EC-15™ CONTROLLER AND CONNECTOR STYLESPACKARD 30 PINCONNECTORDEUTSCH 14 PINCONNECTORSMOUNTINGThe EC-15™ controller is available in two dif

4FIGURE 4 - EC-15™ CONTROLLER MOUNTED ON AN AR-1™ VALVEEC-15™ELECTRONICCONTROLLERAR-1™ ANTILOCKRELAY VALVEactuator(s) it controls and is the last air

5FIGURE 5 - WS-20™ WHEEL SPEED SENSORSHUB ASSEMBLYWS-20™ SPEEDSENSORWS-20™ ANGLEDSENSOREXCITER RING(100) TOOTHWS-20™ STRAIGHTSENSORPACKARDCONNECTORDEU

6FIGURE 5 - M-21™ MODULATORSOLENOIDCONNECTOREXHAUSTSUPPLYMOUNTINGHOLESDELIVERYSUPPLYANTILOCK SYSTEM OPERATION -COMPONENT FAILUREThe Bendix® EC-15™ con

72. Do not pierce wire insulation when testing. Check forpower, ground or continuity by disconnecting theconnector and testing the individual pins or

8FIGURE 7 - WIRING SCHEMATIC FOR EC-15™ CONTROLLER WITH DEUTSCH CONNECTORSDASH LAMPRELAYRETARDERCONTROLSPEED SENSORHOLDEC-15™CONTROLLERCONNECTOR 2EXHA

9FIGURE 9 - WIRING SCHEMATIC FOR EC-15™ CONTROLLER WITH PACKARD CONNECTORRELAYRETARDERCONTROLSPEED SENSORHOLDEXHAUSTSOURCEM-21™MODULATORTERMINAL TERMI