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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Engine Controls - Tests W/Codes - 8.0L) >> Self-Diagnostic Tests >> Test NTC-11A - Checking Park/Neutral Position Switch

Test NTC-11A - Checking Park/Neutral Position Switch

WARNING: This page is about a different car, the 1995 Dodge Pickup and 1995 Dodge Cab & Chassis. 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 at the end of this article.
  1. If vehicle is equipped with manual transmission, following test procedure does not apply. If vehicle is equipped with automatic transmission, read Park/Neutral Position (PNP) switch input state using scan tool. While watching scan tool display, move gear selector between PARK, REVERSE, NEUTRAL and DRIVE positions. If scan tool displays P/N and D/R, system is functioning properly. Test is complete.
  2. If scan tool does not display P/N and D/R, turn ignition off. Place gear selector in PARK position. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 30, PNP switch sense circuit (Black/White wire). Observe scan tool display while moving gear selector between PARK, REVERSE, NEUTRAL and DRIVE 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 always stays less than 5 ohms, go to next step. If display does not always stay less than 5 ohms, go to step 5).
  4. Disconnect PNP switch connector. Using scan tool in ohmmeter mode, check resistance on PCM connector terminal No. 30, PNP switch sense circuit (Black/White wire). If resistance is less than 5 ohms, repair short to ground in Black/White wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PNP switch. Perform TEST VER-2.
  5. Disconnect PNP switch connector. Using external ohmmeter, check resistance of PNP switch sense circuit (Black/White wire) between PNP switch connector and PCM connector terminal No. 30. If resistance is less than 5 ohms, replace PNP switch. Perform TEST VER-2. If resistance is more than 5 ohms, repair open Black/White wire. Perform TEST VER-2.
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