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Test B: Left Front Sensor & Circuit Check

WARNING: This page is about a different car, the 1997 Mercury Grand Marquis, 1997 Ford Crown Victoria, 1996 Mercury Grand Marquis, and 1996 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

  1. DTC C1155 & C1233

    Turn ignition off. Disconnect 28-pin connector from ABCM. ABCM is located below HCU. Connect Breakout Box (014-00322) and ABS Adapter (007-00116) to ABCM wiring harness connector. Measure resistance between breakout box pins No. 5 and 6. If resistance is not 800-1400 ohms, go to next step. If resistance is 800-1400 ohms, go to step 3).
  2. Disconnect left front wheel sensor connector. Measure resistance between sensor connector terminals. If resistance is not 800-1400 ohms, replace wheel sensor. If resistance is 800-1400 ohms, repair circuit to wheel sensor.
  3. Leave ignition off. Turn air suspension switch off (if equipped). Raise and support vehicle. Set DVOM on AC scale. While turning left front wheel about one revolution per second, measure voltage between breakout box pins No. 5 and 6. If AC reading is 0.1-3.5 volts, go to next step. If AC reading is not 0.1-3.5 volts, check wheel sensor mounting and air gap. Repair or replace as necessary.
  4. Turn ignition off. Check for continuity between breakout box pins No. 5 and 13. If continuity exists, go to next step. If continuity does not exist, go to step 6).
  5. Disconnect left front wheel sensor connector. Check for continuity between each sensor connector pin and ground. If continuity exists, replace sensor. If continuity does not exist, repair circuit(s) to sensor.
  6. Leave left front wheel sensor connector disconnected. Check for continuity between breakout box pin No. 13 and body ground. If continuity exists, go to next step. If continuity does not exist, repair circuit No. 57 (Black wire) or circuit No. 530 (Light Green/Yellow wire).
  7. Check left front wheel bearing for excess end play. Check left front sensor ring for damaged teeth. Repair or replace as necessary. Turn air suspension switch on after lowering vehicle.
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