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Test 58: Sensor Ground Error

NOTE: Large transmission in-line harness connector is 12-way (12-way) on 1997 models and 14-way (14-way) on 1998 models.
  1. Turn ignition off. Disconnect TCM harness connector. Measure resistance between speed sensor ground circuit and input speed sensor signal circuit at TCM harness connector. If resistance is 300-1200 ohms, go to step 3). If resistance is not as specified, go to next step.
  2. Disconnect large transmission in-line harness connector. Measure resistance between speed sensor ground circuit and input speed sensor signal circuit at transmission side of large transmission in-line harness connector. If resistance is 300-1200 ohms, repair open in speed sensor ground circuit between large transmission in-line harness connector and TCM harness connector. If resistance is not as specified, repair open in speed sensor ground circuit between large transmission in-line harness connector and input speed sensor.
  3. Check for faulty or misrouted secondary ignition cables. Repair as necessary. If secondary ignition cables are okay, replace TCM.
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