Bendix-commercial-vehicle-systems EC-14 ANTILOCK CONTROLLER 5/04 User Manual

1®SD-13-4784Bendix® EC-14™ AntiLock Controller AssemblyFIGURE 1 - EC-14™ ANTILOCK CONTROLLER ASSEMBLYDESCRIPTIONGENERALBendix trailer antilock systems

10the entire antilock system including wiring continuity. A dashlamp, controlled by the EC-14™ controller, advises the driverof the condition of the e

11"RIGHT" LEDThis red LED illuminates and latches on in order to indicatethe location of a problem component or its wiring. It willlight in

12TROUBLESHOOTINGINITIAL START-UP PROCEDUREDash lamp does not blink, comes onand remains illuminated?Is dash lamp illuminated?Turn ignition ON and obs

13Is voltage correct?Is dash lamp illuminated?Disconnect 30 pin wire harnessconnector from EC-14™ controllerand observe the dash lamp.NOYESNOYESRepeat

14Check closely: is greenLED illuminated?Inspect EC-14™ controller and recordpresence of illuminated LEDsIs green LED Flashing?YESYES (ON)Are any red

15Check closely: Is greenLED Illuminated?Inspect EC-14™ controller and recordpresence of illuminated LEDsIs green LED flashing?YESAre any red LEDsillu

16Go to Section V“Testing for Powerto the EC-14™controller”If any other red LEDs areilluminated, replace the EC-14™controller and repeat the “InitialS

17Is voltage same as batteryvoltage? Must be between11 and 17 volts.Turn ignition off, disconnect wireharness connector from EC-14™controllerYES1A &am

18TROUBLESHOOTINGSECTION VI ATESTING FOR THE FRONT MODULATOREC-14™ Controller WireHarness ConnectorProbe connector with volt/ohm meter and not that pr

19TROUBLESHOOTINGSECTION VI BTESTING FOR THE FRONT MODULATORSTART HEREfrom Section VI AGo to modulator, inspect wiring connector. Disconnectconnector

2FIGURE 2 - MC-14™ ANTILOCK BRAKE SYSTEM

20TROUBLESHOOTINGSECTION VIITESTING FOR THE REAR (M-12™) MODULATORIs resistance in range?Replace the M-12™ modulatorsolenoid assemblyNOAre any red LED

21TROUBLESHOOTINGSECTION VIII PART ATESTING THE WHEEL SPEED SENSORPass magnet over “RESET”on EC-14™ controller. Removemagnet and observe the LEDsAre a

22TROUBLESHOOTINGSECTION VIII PART BTESTING THE WHEEL SPEED SENSORIs the resistance correct?Same LEDs illuminated?Ignition off. Remove connector from

23Is continuity detected?Are all LEDs illuminated?Remove magnet from EC-14™ controller, turn ignitionoff and disconnect the wiring harness connector(s

24TROUBLESHOOTINGSECTION XTESTING FOR FALSE INDICATION CAUSED BY WHEEL SENSOR COMPONENTSSTART HEREAre all LEDs illuminated?Hold a magnet on RESET of t

3M-12™MODULATORASSEMBLYresulting assembly receives a different designation. Forexample, when the EC-14™ antilock controller is mountedon the M-12™ mod

4FIGURE 4 - WS-20™ WHEEL SPEED SENSORS & CONNECTORSPACKARD 2 PINCONNECTORDEUTSCH 2 PINCONNECTOR90° WS-20™ WHEELSPEED SENSORSTRAIGHT WS-20™WHEEL SP

5FIGURE 5 - M-21™ & M-22™ MODULATORSThe EC-14™ controller is designed to be mounted directlyon a modulator relay valve assembly like the M-12™modu

6Rear Axle Brakes - The vehicle’s rear axle brakes arecontrolled by the MC-14™ modulator controller (EC-14™controller and M-12™ modulator). Like the s

7• An M-12™ modulator malfunction on the rear axle(s).• Only front axle antilock will be disabled if a problem withthe M-21™ or M-22™ modulator is det

8FIGURE 6 - MC-14™ ANTILOCK WIRING SCHEMATIC

94. If the work is being performed on the vehicle’s airbrake system, or any auxiliary pressurized airsystems, make certain to drain the air pressure f