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Home › Lincoln › 1997 › Mark VIII Base › Repair and Diagnosis › Brakes › Traction Control › Anti-Lock Brake System › Diagnostic Trouble Code Tests › DTC C1155: Left Front Wheel Speed Sensor Input Circuit Failure

DTC C1155: Left Front Wheel Speed Sensor Input Circuit Failure

NOTE: Wheel speed sensor may also be referred to as brake sensor.

  1. Check Left Front Wheel Speed Sensor

    Disconnect left front wheel speed sensor. Measure resistance between speed sensor terminals. If resistance is 800-1400 ohms, go to next step. If resistance is not 800-1400 ohms, replace left front wheel speed sensor and retest system.

  2. Check For Shorted Sensor

    Measure resistance between speed sensor terminal No. 1 and ground. See Figure . If reading is infinite, go to next step. If reading is not infinite, replace left front wheel speed sensor and retest system.

  3. Check Wheel Speed Sensor Circuitry

    Reconnect left front wheel speed sensor connector. Disconnect ABS control module connector. Connect Breakout Box (014-00322) and ABS Adapter (T90P-50-ALA). Measure resistance between breakout box test terminals No. 4 and 11. If resistance is 800-1400 ohms, go to next step. If resistance is not 800-1400 ohms, go to step 7).

  4. Check Tan/Orange Wire For Short To Ground

    Measure resistance between breakout box test terminals No. 4 and 8. If resistance is 10 k/ohms or less, go to next step. If resistance is greater than 10 k/ohms, go to step 6).

  5. Check Tan/Black Wire For Short To Ground

    Disconnect left front wheel speed sensor connector. Measure resistance between breakout box test terminals No. 4 and 8. If resistance is 10 k/ohms or less, repair short to ground in Tan/Orange wire. If resistance is greater than 10 k/ohms, repair short to ground in Tan/Black wire.

  6. Check For DTC(s)

    Ensure all connectors are properly connected. Using New Generation Star (NGS) tester (007-00500), clear DTC(s). Turn ignition off, then turn ignition on. Perform ABS self-test. See ON-DEMAND SELF-TEST  under DIAGNOSIS. Retrieve all stored DTC(s). If DTC C1155 is retrieved, replace ABS control module. If DTC C1155 is not retrieved, check all connections for corrosion, bent terminals or loose connections. Correct any condition which may cause intermittent failure. After repair, retest system.

  7. Check Tan/Orange Wire For Short To Battery

    Measure voltage between breakout box terminals No. 4 and 8. If any voltage is indicated, go to next step. If no voltage is indicated, go to step 9).

  8. Check Tan/Black Wire For Short To Battery

    Disconnect left front wheel speed sensor. Measure voltage between breakout box terminals No. 4 and 8. If any voltage is indicated, repair short to battery power in Tan/Orange wire. If no voltage is indicated, repair short to battery power in Tan/Black wire. After repair, retest system.

  9. Check Tan/Orange Wire For Open

    Measure resistance between breakout box terminal No. 4 and Tan/Orange wire terminal of left front wheel speed sensor connector. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Tan/Orange wire and retest system.

  10. Check Tan/Black Wire For Open

    Measure resistance between breakout box terminal No. 11 and Tan/Black wire terminal of left front wheel speed sensor connector. If resistance is 5 ohms or less, repair short between Tan/Orange wire and Tan/Black wire in left front wheel speed sensor circuit. If resistance is greater than 5 ohms, repair open in Tan/Black wire. After repair, retest system.
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