Test TC-10A - Auto Shutdown Relay Control Circuit
NOTE:
For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS
article.
- Using scan tool, actuate Auto Shutdown (ASD) relay. Listen for clicking sound at ASD relay. If no clicking sound is heard at ASD relay, go to step 6). If clicking sound is heard at ASD relay, go to next step.
- Condition required to set DTC is not present at this time. AUTO SHUTDOWN RELAY CONTROL CIRCUIT DTC sets if Powertrain Control Module (PCM) detects an open or shorted condition in ASD relay control circuit. Possible causes are: open or shorted relay coil, open fused ignition output circuit, open or shorted ASD relay control circuit, defective PCM, defective connector terminals or connector wires. Go to next step.
- Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, start engine. If vehicle is equipped with a diesel engine, go to step 5). On all other vehicles, go to next step.
- Wiggle wiring harness from ASD relay to PCM. If engine stalls while wiggling wiring harness, repair wiring as necessary and perform TEST VER-2A. If engine does not stall, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
- Disconnect intake air temperature heater relay control connector. Turn headlights on and wiggle wiring harness from ASD relay to PCM. If headlights flicker while wiggling wiring harness, repair wiring as necessary and perform TEST VER-2A. If headlights do not flicker, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-2A.
- Remove ASD relay from power distribution center. Using scan tool in voltmeter mode, check voltage on ASD relay connector, fused ignition switch output circuit (Red/Light Green wire). If voltage is 10 volts or less, repair open in fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
- Using an external ohmmeter, check resistance between ASD relay terminals No. 85 and 86. See Fig 1. If resistance is 100 ohms or more, replace ASD relay and perform TEST VER-2A. If resistance is less than 100 ohms, go to next step.
- Ensure ignition is off. Disconnect Powertrain Control Module (PCM) Gray connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
- Check resistance between ground and PCM Gray connector, ASD relay control circuit (Dark Blue/Yellow wire). If resistance is less than 5 ohms, repair short to ground in ASD relay control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
- Check resistance of ASD relay control circuit (Dark Blue/Yellow wire) between ASD relay connector and PCM Gray connector. If resistance is 5 ohms or more, repair open ASD relay control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A.