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. [. . . ] 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. (Note: Right and left, front and rear are determined from the driver's seat. Left front is therefore the corner closest to the driver. ) 10 "REAR" 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 REAR LED will also light in conjunction with the MOD LED to indicate that the rear modulator (M-12TM) or its wiring has malfunctioned. "RIGHT" 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 FRONT or REAR LED and SENS LED. This LED should not light when a MOD LED is on. "RESET" Beneath the RESET area of the window display is a magnetically sensitive switch that is used to reset the diagnostic system. The device will respond to a magnet which has strength sufficient to lift a three (3) ounce weight. Holding a magnet against the RESET will cause all LEDs to light during the time the magnet is against it. "LEFT" 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 FRONT or REAR LED and SENS LED. This LED should not light when a MOD LED is on. TROUBLESHOOTING GENERAL While the EC-14TM controller diagnostic display locates a specific problem area, it is still necessary to confirm whether the problem resides in the component itself or the wiring. Basically the troubleshooting procedure that follows is devoted to narrowing the problem to either the wiring or a specific antilock component. It should be noted that all troubleshooting begins by observing the antilock status lamp on the dash while performing the "Initial Startup Procedure" and following the directions contained in the procedure. "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 two modulators or the wiring connecting them to the system. The MOD LED will illuminate in conjunction with either the FRONT or REAR LED. "SENS" LED This red LED illuminates and latches on to indicate permanent or intermittent problem. The faults indicated are; open or shorted wheel speed sensor, open or shorted wheel speed sensor wiring, wheel speed signal not present or does not conform to design criteria. The SENS LED will illuminate in conjunction with either the FRONT or REAR and either the RIGHT or LEFT LED. IMPORTANT - TROUBLESHOOTING TIPS 1. Record all findings and the action taken during the troubleshooting process. [. . . ] Resistance for Bendix® WS-20TM speed sensor is between 1500-2500 Ohms. Refer to vehicle manual for the resistance values if other than WS-20TM speed sensor is in use. YES Is the resistance correct?NO Disconnect connector at speed sensor. Inspect the connector, then check the resistance between two pins on sensor. [. . . ]