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Code 51 - Inhibitor Switch - A/T

NOTE: Refer to illustration for connector and terminal identification. See Figure -Figure .
  1. Turn ignition on. Measure voltage between ECM connector E29, terminal No. 16 (backprobe) and ground. In Park or Neutral, 10-14 volts should be present. In all other positions, zero volts should be present. If voltages are not to specification, go to next step. If voltages are to specification, repair ECM harness or connector. If harness and connector are okay, replace ECM.
  2. Turn ignition off. Disconnect ECM and transmission harness 12-pin connector. Measure resistance between transmission harness 12-pin connector terminals No. 1 (Light Green/Yellow wire), No. 3 (Blue/Orange wire), and ECM connector E29, terminal No. 16. Less than 10 ohms should be present in both cases. Measure resistance between ECM connector E29, terminal No. 16 and ground. Minimum of one megohm should be present.
  3. If resistances are not to specification, repair or replace harness. If resistances are to specification, check and repair inhibitor switch and wiring as necessary.
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