P0685

P0685-AUTO SHUTDOWN RELAY CONTROL CIRCUIT






For a complete wiring diagram refer to: Electrical Diagrams

When Monitored
With ignition on. Battery voltage above 10 volts.

Set Condition
An open or shorted condition is detected in the ASD relay control circuit. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes
- (A922) FUSED B+ CIRCUITS
- (K51) ASD RELAY CONTROL CIRCUIT OPEN
- (K51) ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND
- ASD RELAY
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test
1. ASD RELAY OPERATION





Ignition on, engine not running.
With a scan tool, actuate the ASD Relay.

Is the ASD Relay operating?
Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 2
2. (A922) FUSED B+ CIRCUITS





Turn the ignition off.
Remove the ASD Relay from the IPM.
Using a 12-volt test light connected to ground, probe the (A922) Fused B+ circuits in the IPM.

Does the test light illuminate brightly?
Yes >> Go To 3
No >> Repair the open or short to ground in the (A922) Fused B+ circuits. Inspect and replace any open fuses.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
3. ASD RELAY
Measure the resistance of the ASD Relay Coil.

Is the resistance between 60 to 80 ohms?
Yes >> Go To 4
No >> Replace the ASD Relay.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
4. (K51) ASD RELAY CONTROL CIRCUIT OPEN





Disconnect the PCM harness connectors.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (K51) ASD Relay Control circuit from the IPM to the appropriate terminals of special tool #8815.

Is the resistance below 5.0 ohms?
Yes >> Go To 5
No >> Repair the open in the (K51) ASD Relay Control circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
5. (K51) ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND





Measure the resistance between ground and the (K51) ASD Relay Control circuit in the IPM.

Is the resistance below 100 ohms?
Yes >> Repair the short to ground in the (K51) ASD Relay Control circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 6
6. PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?
Yes >> Repair as necessary
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test