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TCM Self-Diagnosis Does Not Activate

WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Inspect voltage on PNP switch circuits at TCM harness connector while moving gear selector through each position. See PIN VOLTAGE TESTS . If voltage measurements are correct for all specified circuits, go to next step. If any voltage measurements are not correct, check harness and connectors for open or short to ground between ignition switch and PNP switch, and between PNP switch and TCM. If open or short is found, repair circuit(s) as necessary.
  2. Backprobing TCM harness connector, measure voltage between ground and terminal No. 22. Battery voltage should be present with overdrive switch in ON position. No voltage should be present with switch in OFF position. If voltage is as specified, go to next step. If voltage is not as specified, check harness and connectors for open or short. Repair as needed. If no problems are found, inspect switch. See OVERDRIVE SWITCH  under COMPONENT TESTS.
  3. Inspect voltage on throttle position switch circuits at TCM harness connector. See PIN VOLTAGE TESTS . If voltage measurements are correct for all circuits, go to next step. If voltage measurements are not correct, check harness and connectors for open or short to ground between ignition switch and throttle position switch, and between throttle position switch and TCM. If open or short is found, repair circuit(s) as necessary.
  4. Retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES . If no DTCs are present, perform TCM SELF-DIAGNOSTIC PROCEDURE . If TCM self-diagnostic cannot be performed, inspect TCM connectors. Ensure connector terminals are clean and tight. Repair as needed.
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