LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Engine Controls - Tests W/Codes - 3.9L) >> No-Start Tests >> Test NS-6A - Correcting No Response Condition

Test NS-6A - Correcting No Response Condition

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, 1995 Dodge Dakota, 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 diagram, see WIRING DIAGRAMS  section at the end of this article.
  1. If vehicle starts, go to TEST NS-6B. If vehicle does not start, turn ignition off. Disconnect Throttle Position (TP) sensor connector. Turn ignition on.
  2. Using scan tool in voltmeter mode, check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is more than 6 volts, repair open ground circuits at Powertrain Control Module (PCM) connector terminals No. 11 (Black/Tan wire) and No. 12 (Black/Tan wire). Perform TEST VER-1. If voltage is less than 6 volts, go to next step.
  3. If voltage is less than 4.4 volts, go to step 5). If voltage is more than 4.4 volts, reconnect TP sensor connector. Disconnect Manifold Absolute Pressure (MAP) sensor electrical connector.
  4. Using scan tool, check voltage on MAP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is more than 4.4 volts, go to TEST NS-6B. If voltage is less than 4.4 volts, replace TP sensor. Perform TEST VER-1.
  5. Disconnect Manifold Absolute Pressure (MAP) sensor electrical connector. Using scan tool, check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is more than 4.4 volts, replace MAP sensor. Perform TEST VER-1.
  6. If voltage is less than 4.4 volts, turn ignition off. Disconnect PCM connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 6, 5-volt supply circuit (Violet/White wire). If resistance is less than 5 ohms, repair short to ground in Violet/White wire. Perform TEST VER-1.
  7. If resistance is more than 5 ohms, check resistance between throttle position sensor connector, ground circuit (Black/Light Blue wire) and PCM connector terminal No. 6 (Violet/White wire) using an external ohmmeter. If resistance is less than 5 ohms, repair short to ground in Violet/White wire. Perform TEST VER-1.
  8. If resistance is more than 5 ohms, turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 9, fused ignition switch output circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body). If voltage is less than 10 volts, repair open Dark Blue wire, Light Green/Black wire or Light Blue wire between PCM connector and ignition switch. Perform TEST VER-1.
  9. If voltage is more than 10 volts, check voltage on PCM connector terminal No. 3, fused battery voltage circuit (Red wire on AB body; Red/White wire on AN and BR bodies) using scan tool. If voltage is more than 10 volts, replace PCM. Perform TEST VER-1. If voltage is less than 10 volts, go to next step.
  10. Remove PCM fuse from Power Distribution Center (PDC). Inspect fuse. If fuse is okay, go to next step. If fuse is blown, go to step 12).
  11. Using scan tool in voltmeter mode, check voltage on battery voltage side of PDC fuse socket. If voltage is more than 10 volts, repair open Red wire or Red/White wire between PDC fuse socket and PCM connector terminal No. 3. Perform TEST VER-1. If voltage is less than 10 volts, repair open battery voltage side of PDC fuse socket. Perform TEST VER-1.
  12. Turn ignition off. Remove Auto Shutdown (ASD) relay and fuel pump relay. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 3, fused battery voltage circuit (Red wire on AB body); Red/White wire on AN and BR bodies). If resistance is less than 5 ohms, repair short to ground in Red/White wire or Red wire. Replace fuse. Perform TEST VER-1.
  13. If resistance is more than 5 ohms, check resistance of ASD relay connector terminal, ASD relay output circuit (Dark Green/Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, go to TEST NS-6C.
  14. Disconnect O2S connector. Using scan tool, check resistance of O2S connector, output circuit (White wire). If resistance is more than 5 ohms, replace O2S. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  15. Disconnect ignition coil connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace ignition coil. Replace fuse. Perform TEST VER-1.
  16. If resistance is less than 5 ohms, disconnect generator field connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, repair short to ground in generator. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  17. Disconnect No. 1 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 1 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  18. Disconnect No. 2 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 2 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  19. Disconnect No. 3 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 3 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  20. Disconnect No. 4 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 4 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  21. Disconnect No. 5 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 5 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  22. Disconnect No. 6 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 6 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  23. On 6-cylinder models, repair short to ground in ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). Perform TEST VER-1.
  24. Disconnect No. 7 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 7 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  25. Disconnect No. 8 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 8 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, repair short to ground in Dark Green/Orange wire or Dark Green/Black wire. Replace fuse. Perform TEST VER-1.
scientia non olet · About LEMON Manuals