LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Engine Controls - Tests W/Codes - 8.0L) >> 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 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 starts, go to TEST NS-6B. If vehicle does not start, turn ignition off. Disconnect Throttle Position Sensor (TPS) connector. Turn ignition on.
  2. Using scan tool in voltmeter mode, check voltage on TPS 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 TPS 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 TPS. Perform TEST VER-1.
  5. Disconnect Manifold Absolute Pressure (MAP) sensor electrical connector. Using scan tool, check voltage on TPS 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 PCM connector terminal No. 4, ground circuit (Black/Light Blue wire) and PCM connector terminal No. 6, 5-volt supply circuit (Violet/White wire) using an external ohmmeter. If resistance is less than 5 ohms, repair Black/Light Blue wire for a short to 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 (Light Green/Black wire). If voltage is less than 10 volts, repair open Light Green/Black 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/White wire) 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 fuse No. 5 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/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/White wire). If resistance is less than 5 ohms, repair short to ground in Red/White wire. Replace fuse. Perform TEST VER-1.
  13. If resistance is more than 5 ohms, disconnect left and right O2S connectors. Using scan tool, check resistance of left O2S connector (component side), relay output circuit (White wire). If resistance is less than 5 ohms, replace left O2S. Perform TEST VER-1.
  14. If resistance is more than 5 ohms, check resistance of right O2S connector (component side), relay output circuit (White wire). If resistance is less than 5 ohms, replace right O2S. Perform TEST VER-1.
  15. If resistance is more than 5 ohms, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, go to TEST NS-6C. If resistance is less than 5 ohms, go to next step.
  16. Ensure O2S connectors are disconnected. Disconnect front ignition coil connector. Check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace front ignition coil. Replace fuse. Perform TEST VER-1.
  17. If resistance is less than 5 ohms, disconnect rear ignition coil connector. Check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace rear ignition coil. Replace fuse. Perform TEST VER-1.
  18. If resistance is less than 5 ohms, disconnect generator field connector. 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.
  19. If resistance is less than 5 ohms, Disconnect No. 1 fuel injector connector. Check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 1 fuel injector. Replace fuse. Perform TEST VER-1.
  20. If resistance is less than 5 ohms, Disconnect No. 2 fuel injector connector. 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.
  21. If resistance is less than 5 ohms, Disconnect No. 3 fuel injector connector. 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.
  22. If resistance is less than 5 ohms, Disconnect No. 4 fuel injector connector. 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.
  23. If resistance is less than 5 ohms, Disconnect No. 5 fuel injector connector. 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.
  24. If resistance is less than 5 ohms, Disconnect No. 6 fuel injector connector. 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.
  25. If resistance is less than 5 ohms, Disconnect No. 7 fuel injector connector. 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.
  26. If resistance is less than 5 ohms, Disconnect No. 8 fuel injector connector. 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.
  27. If resistance is less than 5 ohms, Disconnect No. 9 fuel injector connector. Check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 9 fuel injector. Replace fuse. Perform TEST VER-1.
  28. If resistance is less than 5 ohms, Disconnect No. 10 fuel injector connector. Check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 10 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, repair short to ground in ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). Perform TEST VER-1.
scientia non olet · About LEMON Manuals