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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Engine Controls - Tests W/Codes - 3.8L) >> 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 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, 1995 Dodge Caravan, and 1995 Chrysler Town & Country. 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 (TP) sensor connector. Turn ignition on. Put scan tool in voltmeter mode.
  2. Using scan tool, 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. 5 (Black/White wire), 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 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 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).
  7. If resistance is less than 5 ohms, repair short to ground in Violet/White wire. Perform TEST VER-1. If resistance is more than 5 ohms, turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 9, ignition 12-volt feed circuit (Dark Blue/White wire).
  8. If voltage is less than 10 volts, repair open Dark Blue/White wire between PCM connector and ignition switch. Perform TEST VER-1. If voltage is more than 10 volts, go to next step.
  9. Using scan tool, check voltage on PCM connector terminal No. 3, battery voltage circuit (Red/White wire). 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 ENGINE 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 (Red/White wire). 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 Red/White wire between PDC fuse socket and battery. Perform TEST VER-1.
  12. Turn ignition off. Disconnect Auto Shutdown (ASD) and fuel pump relays. 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, check resistance of ASD relay connector terminal output circuit (Dark Green/Orange wire). If resistance is less than 5 ohms, go to step 16). If resistance is more than 5 ohms, go to next step.
  14. Disconnect fuel pump connector and Oxygen Sensor (O2S) connector. Using scan tool, check resistance of fuel pump connector output circuit (Dark Green/Black wire). If resistance is less than 5 ohms, repair short to ground in Dark Green/Black wire. Perform TEST VER-1.
  15. If resistance is more than 5 ohms, check resistance of O2S connector relay output circuit (Dark Green/Orange wire) using scan tool. If resistance is more than 5 ohms, replace fuel pump. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, replace O2S. Replace fuse. Perform TEST VER-1.
  16. Disconnect ignition coil connector. Using scan tool, check resistance of ASD relay connector output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace ignition coil. Replace fuse. Perform TEST VER-1.
  17. If resistance is less than 5 ohms, disconnect generator field connector. Using scan tool, check resistance of ASD relay connector 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.
  18. If resistance is less than 5 ohms, disconnect fuel injector harness 10-pin connector. Using scan tool, check resistance of ASD relay connector output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, repair short to ground in fuel injector harness (Dark Green/Orange wire). Replace fuse. Perform TEST VER-1.
  19. If resistance is less than 5 ohms, disconnect fuel injector harness 6-pin connector. Using scan tool, check resistance of ASD relay connector output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, repair short to ground in fuel injector harness (Dark Green/Orange wire). Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, repair short to ground in ASD relay connector Dark Green/Orange wire. Perform TEST VER-1.
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