User manual BENDIX EC-15 ANTILOCK CONTROLLER ASSY

[. . . ] ® Bendix® EC-15TM AntiLock Controller Assembly MOUNTING HOLES (4) DIAGNOSTICS WINDOW DISPLAY FIGURE 1 - EC-15TM ELECTRONIC CONTROLLER DESCRIPTION GENERAL Bendix antilock systems utilizing the EC-15 electronic controller assembly provide full vehicle, wheel control braking for buses, trucks, and truck tractors. By minimizing the potential of "brake lock-up" on all wheels during aggressive braking the vehicle retains a high degree of stability and steerability, and in most cases vehicle stopping distance is reduced. In order to provide full vehicle, wheel control braking, the EC-15TM controller assembly is used in combination with the following components: - Four, individual wheel speed sensors - Four, air pressure modulator valves - Antilock condition lamp (dash mounted) TM PHYSICAL The EC-15TM 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 radio and electromagnetic interference. [. . . ] It should be noted that the EC-15TM controller diagnostics display is separate from the antilock condition lamp on the dash. With this separation, the driver is aware of any problems that occur but is not confused by the diagnostic information. A special feature of the EC-15TM controller is the failure latching and diagnostic system. Intermittent problems, particularly in the wheel speed sensing area can be difficult to diagnose. When the controller senses an erroneous condition, whether in the controller electronics, the modulator or wheel speed sensing areas, it stores the condition in non-volatile memory, disables the antilock function, illuminates the dash mounted antilock condition lamp and the appropriate diagnostic LEDs on the EC-15TM controller. The failure condition is truly stored and is not cleared by loss of power to the EC-15TM controller. The LEDs will re-light when power is restored and remain illuminated until the failure is corrected. After the actual problem is corrected, maintenance personnel can clear or reset the EC-15TM 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-15TM controller diagnostic window. The first five LEDs locate a problem to a specific area of the vehicle while the last four indicate the problem 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. Left front is therefore the corner closest to the driver. ) 2. Note and mark the mounting position of the EC-15TM controller on the vehicle. Loosen, remove and save the nuts on the mounting hardware that attaches the EC-15TM controller bracket to the vehicle. Remove the EC-15TM controller and bracket from the vehicle. Remove and retain the four cap screws that secure the EC-15TM controller to the bracket. Separate the EC-15TM controller from the bracket. INSTALLING THE EC-15TM CONTROLLER ASSEMBLY EC-15TM CONTROLLER MOUNTED ON ANTILOCK RELAY VALVE 1. After noting the relationship of the positioning marks made prior to disassembly, position the gasket on the EC-15TM controller then secure the EC-15TM controller to the antilock relay valve using the four cap screws. Mount the assembled EC-15TM controller and antilock relay valve on the vehicle and orient it in the position marked prior to removal. Reconnect all air lines to the assembly. Reconnect the electrical connector(s) to the EC-15TM controller. [. . . ] CHECK WIRING HARNESS AND CONNECTORS THAT RUN TO SENSOR. 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. RECONNECT CONNECTORS AT EC-15TM CONTROLLER AND SPEED SENSOR, DO MAGNETIC RESET. YES GO TO SECTION III "INSPECTION FOR ILLUMINATED LED'S. " ARE ANY RED LED'S ILLUMINATED?NO GO TO "INITIAL START-UP PROCEDURE" 21 TROUBLESHOOTING SECTION VI PART B - TESTING THE WHEEL SPEED SENSOR START HERE FROM SECTION VII PART A NO GO TO SECTION III "INSPECTION FOR ILLUMINATED LEDS". SAME LED'S ILLUMINATED? YES IGNITION OFF. [. . . ]