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Test NF-10A - Checking Park/Neutral Switch

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, read park/neutral switch input state. While watching DRB-II display, move gear selector in and out of Park and Reverse positions. If display shows P/N and D/R, system is functioning properly. Test is complete. If display does not show P/N and D/R, go to next step.
  2. Turn ignition off. Place gear selector in Park position. Disconnect Powertrain Control Module (PCM) connector. Put DRB-II in ohmmeter mode. Using DRB-II, check resistance on PCM connector terminalNo. 30, park/neutral switch sense circuit (Brown/Yellow wire). Observe DRB-II display while moving gear selector in and out of Park and Reverse positions.
  3. If display switches from less than 5 ohms to more than 5 ohms, replace PCM. Perform VERIFICATION PROCEDURE VER-2. If display does not switch from less than 5 ohms to more than 5 ohms, check if display always stays less than 5 ohms. If display always stays less than 5 ohms, repair short to ground in Brown/Yellow wire. Perform VERIFICATION PROCEDURE VER-2. If display does not always stay less than 5 ohms, go to next step.
  4. Disconnect park/neutral switch connector. Using an external ohmmeter, check resistance of sense circuit (Brown/Yellow wire) between park/neutral switch connector and PCM connector terminal No. 30. If resistance is less than 10 ohms, replace park/neutral switch. Perform VERIFICATION PROCEDURE VER-2. If resistance is more than 10 ohms, repair open in Brown/Yellow wire. Perform VERIFICATION PROCEDURE VER-2.
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