LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Engine Controls - Tests W/Codes - 5.9L Gasoline) >> Self-Diagnostic Tests >> Test TC-38A - Auto Shutdown Relay Control Circuit

Test TC-38A - Auto Shutdown Relay Control Circuit

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 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 diagram, see WIRING DIAGRAMS  section at the end of this article.
  1. Using scan tool, actuate Auto Shutdown (ASD) relay. If ASD relay is not clicking, go to step 5). If ASD relay is clicking, condition required to set trouble code is not present at this time.
  2. AUTO SHUTDOWN RELAY CONTROL CIRCUIT trouble code sets if an open or short is detected in ASD relay circuit. Possible causes are: open or short in ASD relay control circuit (Dark Blue/Yellow wire), open or short in ASD relay fused ignition switch output circuit (Dark Blue wire), ASD relay coil open or shorted, inoperative circuit driver in Powertrain Control Module (PCM) or PCM failure. Go to next step.
  3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
  4. Start engine. Wiggle wiring harness from ASD relay to PCM. If engine stalls while wiggling wiring harness, repair wiring harness as necessary. Perform TEST VER-2. If engine did not stall while wiggling wiring harness, see INACTIVE TROUBLE CODE CONDITION  .
  5. Remove ASD relay. Using scan tool in voltmeter mode, check voltage on ASD relay connector, fused ignition switch output circuit (Dark Blue wire). If voltage is less than 10 volts, repair open Dark Blue wire or Light Blue/Red wire. Perform TEST VER-2.
  6. If voltage is more than 10 volts, use an external ohmmeter to check resistance across ASD relay terminals. See Figure . If resistance is more than 100 ohms, replace ASD relay. Perform TEST VER-2. If resistance is less than 100 ohms, go to next step.
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 51 (Dark Blue/Yellow wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Yellow wire or Pink wire. Perform TEST VER-2.
  8. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of ASD relay control circuit (Dark Blue/Yellow wire) between ASD relay connector and PCM connector terminal No. 51. If resistance is more than 5 ohms, repair open Dark Blue/Yellow wire or Pink wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
scientia non olet · About LEMON Manuals