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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Engine Controls - Tests W/Codes - 3.0L) >> Self-Diagnostic Tests >> Test NTC-10A - Checking Park/Neutral Switch

Test NTC-10A - Checking Park/Neutral Switch

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS  section.
  1. Using scan tool, read park/neutral switch input state. While watching scan tool display, move gear selector in and out of Park and Reverse positions. If display shows P/N and D/R, system is functioning correctly. 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. Using scan tool in ohmmeter mode, check resistance on PCM connector terminal No. 30 (Brown/Orange wire). Observe scan tool 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 TEST 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 does not always stay less than 5 ohms, go to next step. If display always stays less than 5 ohms, repair short to ground in Brown/Orange wire. Perform TEST VER-2.
  4. Disconnect park/neutral switch connector. Using an external ohm-meter, check resistance of sense circuit (Brown/Orange wire) between park/neutral switch connector and PCM connector terminal No. 30. If resistance is less than 10 ohms, replace park/neutral switch. Perform TEST VER-2. If resistance is more than 10 ohms, repair open Brown/Orange wire. Perform TEST VER-2.
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