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Test NTC-19: Checking Park/Neutral Position Switch

NOTE: For circuit identification, see WIRING DIAGRAMS article. If replacing Powertrain Control Module (PCM), PCM must be reprogrammed. See PROGRAMMING . After each repair procedure has been completed, reconnect all components. Perform TRANSMISSION VERIFICATION TEST  to ensure system is functioning properly. Ensure no DTCs are present before performing this test.
NOTE: Vehicles are equipped with a Transmission Range Sensor (TRS). TRS may be referred to as park/neutral switch during test procedure.
  1. Using scan tool, read park/neutral switch input state. Observe scan tool display while moving gear selector through all gear positions. If scan tool displayed P/N and D/R with gear selector in correct gear position, no problem is indicated at this time. Test is complete. If scan tool did not display P/N and D/R with gear selector in correct gear position, go to next step.
  2. Put gear selector in Park. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). See Figure. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, disconnect TRS 10-pin connector located on left side of transaxle. Measure resistance of TRS T41 sense circuit between terminal No. 5 (Black/White wire) at TRS harness connector and terminal No. 76 (Brown/Yellow wire) at PCM C2 harness connector. See Figure and Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in TRS T41 sense circuit.
  3. Disconnect TCM connector. TCM is located on left side of engine compartment. See Figure. Measure resistance between ground and terminal No. 5 (Black/White wire) at TRS harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, check for short to ground in TRS T41 sense circuit between PCM and TRS. If circuit is okay, check for a short to ground in TRS T41 sense circuit between terminal No. 10 (Brown/Yellow wire) at TRS harness connector and terminal No. 41 at TCM harness connector. See Figure and Figure . PCM TRS T41 sense circuit is connected to TCM T41 sense circuit at splice S113. Repair wiring as necessary.
  4. Reconnect TRS and TCM connectors. Measure resistance between ground and terminal No. 76 (Brown/Yellow wire) at PCM C2 harness connector while moving gear selector through all gear positions. If resistance switches from more than 10 ohms to less than 10 ohms, go to next step. If resistance does not switch from more than 10 ohms to less than 10 ohms, replace TRS.
  5. At this time, PCM is assumed to be defective. Replace PCM.
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