User manual BENDIX EC-14 ANTILOCK CONTROLLER

[. . . ] ® Bendix® EC-14TM AntiLock Controller Assembly 30 PIN WIRE HARNESS CONNECTOR MOUNTING HOLES (4) DIAGNOSTICS WINDOW FIGURE 1 - EC-14TM ANTILOCK CONTROLLER ASSEMBLY DESCRIPTION GENERAL Bendix trailer antilock systems utilizing the EC-14 TM electronic controller assembly provide axle braking control for buses, trucks, and truck 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-14TM controller is used in combination with the following components: 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. [. . . ] Note: Use a new gasket if damaged during removal or if a new gasket is immediately available. INSTALLING THE EC-14TM CONTROLLER ASSEMBLY 1. After noting the positioning marks made prior to disassembly, reconnect the M-12TM modulator wire harness to the EC-14TM controller, position the gasket on the EC-14TM controller then secure the EC-14TM controller to the M-12TM modulator using the four cap screws. Mount the assembled MC-14TM modulator controller on the vehicle and orient it in the position marked prior to removal. Test the MC-14TM modulator controller for operation and air leakage prior to placing the vehicle in service. EC-14TM CONTROLLER GASKET M-12TM MODULATOR MOUNTING BRACKET 6. Perform the "Initial Start up Procedure" in the Troubleshooting section to assure proper antilock system operation. FIGURE 7 - MC-14TM MODULATOR CONTROLLER REMOVING EC-14 TM CONTROLLER ASSEMBLY DIAGNOSING AND LOCATING A SYSTEM PROBLEM GENERAL The EC-14TM controller contains self test and diagnostic circuitry that continuously checks for proper operation of 9 Locate the EC-14TM controller on the trailer and determine if it is mounted on a modulator (e. g. M-12TM modulator) or is remote mounted to a trailer frame member using a bracket. Use the appropriate removal procedure below. FIGURE 8 - EC-14TM CONTROLLER DIAGNOSTIC WINDOW the entire antilock system including wiring continuity. A dash lamp, controlled by the EC-14TM 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-14TM controller housing. No special tools or equipment are needed to read or interpret the EC-14TM controller diagnostics window. It should be noted that the 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 concerned with in-depth diagnostic information. A special feature of the EC-14TM controller diagnostic system is its failure latching. 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 speed sensing areas, it stores the condition in non-volatile memory, disables the antilock function if necessary, illuminates the dash mounted antilock condition lamp and the appropriate diagnostic LEDs on the EC-14TM controller. The malfunction condition is truly stored and is not cleared by loss of power to the EC-14TM 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-14 TM controller diagnostics by passing a small magnet over the RESET point in the diagnostics window. LED LED LED LED LED LED LED LED LED ¦¦¦ o FRONT Red LED o MID o REAR Red LED (SEE NOTE) Red LED o RIGHT Red LED o LEFT Red LED o MOD Red LED o SENS Red LED o ECU o VOLT RESET Red LED Green LED No LED Note: The MID LED shown in the chart above is not used in the diagnostic process for the EC-14TM 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 or its wiring. It 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-21TM or M-22TM) or its wiring has malfunctioned. "MID" LED This red LED is not used in troubleshooting the EC-14TM controller and should light only when a magnet is held on the RESET switch. DIAGNOSTIC LEDS There are nine LEDs plus a magnetically actuated reset switch in the EC-14TM 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. [. . . ] Retest. MAGNET HERE EC-14TM Controller Wire Harness Connector 3C RT. FRONT Reconnect EC-14TM controller connector, turn ignition on and pass magnet over "RESET" on EC-14TM controller and remove. FRONT Testing Speed Sensor Resistance Repeat the "Initial Start-up Procedure" Go to Section IV "Inspection for Illuminated Red LEDs" and retest 21 TROUBLESHOOTING SECTION VIII PART B TESTING THE WHEEL SPEED SENSOR START HERE from Section VIII A YES Go to Section IV "Inspection for Illuminated LEDs" Same LEDs illuminated?Measure resistance between the appropriate speed signal pins on the connector. [. . . ]