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ABS Diagnostic Information for the Ford EF II Falcon

Introduction


  • Bosch ABS 2U module
    This document describes the ABS Error codes for the Bosch ABS 2U model, which was fitted to Ford EF and EL Models, Ford Falcon, Fairmont, Fairlane, LTD, and XR series vehicles
    This information includes how to place the ABS into diagnostic mode, and how to read the codes without using a Diagnostic connector

About the ABS Diagnostic Mode


  • The Bosch ABS 2U system, has a self test facility, and will hold intermittent faults within its memory, for a period of 250 Key Starts.
    Fault codes are classified as being either on demand, i.e. present at the time of the self test, or stored, i.e. occurred previously and have since been repaired and intermittent faults.
    Upon detecting a fault, the ECU will shut the ABS system down, the Check ABS light will illuminate, and the Fault will be logged.
    After one ignition cycle and if the fault has been rectified, the ABS system will again be operational, and will log the fault as a stored code.
    Once the system has shut down, it will not recover until the ignition has been cycled.
    Up to 3 codes can be logged simultaneously, and can be viewed sequentially. For this reason, it is important that the system is retested once a problem has been rectified, to ensure that no further fault codes exist.

Entering Diagnostic Mode


  • The Diagnostic connector is located behind the fuse box panel cover (underneath the Instrument panel, on the right of the steering column).
    The ABS module can be entered into diagnostic mode by grounding the ABS STI (Self Test Input) pin, on the Vehicles Diagnostic connector.
    This can be achieved by connecting the ABS GND pin (3rd pin from left, second row), to the ABS STI pin (3rd pin from left, upper row).
    Diagnostic connector


    Once the ABS Module has been placed in to Diagnostic mode, the Check ABS Light on the Instrument Panel will flash, giving the ABS Trouble code.

Clearing ABS Diagnostic Fault Codes


  • The ABS ECU Self test codes are held in the EEPROM, and can only be cleared by performing a self test procedure, interrupting the self test during code display (i.e. removing the Ground link to the ABS STI pin), and waiting 3-5 seconds, before switching the ignition off.

Diagnostic Codes


  • Code Name Description Action Required
    12 No ABS Fault codes Stored System OK (as far as self test can determine)  
    19 ABS ECU Fault There is an internal fault with the ABS ECU. The ECU Must be Replaced Replace ABS ECU, and retest system
    22 Right Front Valve Fault (Drivers Side) There is a fault in the Solenoid, The ABS Modulator unit must be replaced Replace ABS Modulator, and retest system
    24 Left Front Valve Fault (Passenger Side) There is a fault in the Solenoid, The ABS Modulator unit must be replaced Replace ABS Modulator, and retest system
    26 Rear Valve Fault There is a fault in the Solenoid, The ABS Modulator unit must be replaced Replace ABS Modulator, and retest system
    31 Right Front wheel speed sensor continuity fault (Drivers Side) The ABS Speed sensor is open circuit. The fault could lie in either the sensor, wiring, or ECU Perform Test 1 - Test Speed sensor, and wiring loom for speed sensor
    32 Right Rear wheel speed sensor continuity fault (Drivers Side) The ABS Speed sensor is open circuit. The fault could lie in either the sensor, wiring, or ECU Perform Test 1 - Test Speed sensor, and wiring loom for speed sensor
    33 Left Front wheel speed sensor continuity fault (Passenger Side) The ABS Speed sensor is open circuit. The fault could lie in either the sensor, wiring, or ECU Perform Test 1 - Test Speed sensor, and wiring loom for speed sensor
    34 Left Rear wheel speed sensor continuity fault (Passenger Side) The ABS Speed sensor is open circuit. The fault could lie in either the sensor, wiring, or ECU Perform Test 1 - Test Speed sensor, and wiring loom for speed sensor
    41 Right Front wheel speed sensor fault (Drivers Side) The sensor signal is wrong for the current vehicle conditions. The fault could be in the sensor, the wiring, or the ECU. The tone wheel may be missing, or the wrong type fitted. The Sensor may have fallen out. Perform Test 2 - Test Speed sensor, and wiring loom for speed sensor
    42 Right Rear wheel speed sensor fault (Drivers Side) The sensor signal is wrong for the current vehicle conditions. The fault could be in the sensor, the wiring, or the ECU. The tone wheel may be missing, or the wrong type fitted. The Sensor may have fallen out. Perform Test 2 - Test Speed sensor, and wiring loom for speed sensor
    43 Left Front wheel speed sensor fault (Passenger Side) The sensor signal is wrong for the current vehicle conditions. The fault could be in the sensor, the wiring, or the ECU. The tone wheel may be missing, or the wrong type fitted. The Sensor may have fallen out. Perform Test 2 - Test Speed sensor, and wiring loom for speed sensor
    44 Left Rear wheel speed sensor fault (Passenger Side) The sensor signal is wrong for the current vehicle conditions. The fault could be in the sensor, the wiring, or the ECU. The tone wheel may be missing, or the wrong type fitted. The Sensor may have fallen out. Perform Test 2 - Test Speed sensor, and wiring loom for speed sensor
    61 ABS Pump motor fault There is a fault in the ECU or the modulator Check Hydraulic Pump earth strap connection. Replace ECU
    63 Valve Relay, or Valve Relay supply voltage fault There is a fault with the ECU or Modulator Check that ABS ECU is connected to power, and ground. Replace ECU.
    69 Voltage Fault The ECU has detected a low supply voltage. The cause could be alternator, battery, wiring or the ECU Check Power wiring to ABS ECU for any faults, re-test.
    78 ABS Operation error While the ABS was operating, road conditions caused incompatible wheel speed signal errors. Usually caused by doing burnouts and line locks. Erase code and Road Test. Inspect tone wheels for missing teeth, or run out. Replace faulty tone wheels

ABS Test 1


  • 1) Is the Wheel speed sensor connected. If not connect wheel sensor and re-test
  • 2) Is the Wheel sensor resistance 1.2KOhm +- 0.2KOhm (Front Sensors) - 2.2KOhm +- 0.4KOhm (Rear Sensors). If not, replace sensor, and Re-test.
  • 3) Repair Wiring loom, and re-test

ABS Test 2


  • 1) Is the Wheel speed sensor securely attached. If not, then secure and re-test
  • 2) Is the correct tone wheel in place. If not, fit correct tone wheel, and re-test
  • 3) Inspect tone wheel, and run out. If tone wheel faulty, replace, and re-test
  • 4) Is sensor connected. If not, re-connect sensor, and re-test
  • 5) Is sensor shorted to ground, or another sensor. If so, replace wiring loom, and re-test.
  • 6) If problem still exists, replace wiring loom. and re-test.
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