P0685-AUTO SHUTDOWN CONTROL CIRCUIT

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With ignition on. Battery voltage above 10 volts.
Set Condition:
The actual ASD state is not equal to the desired ASD state. One Trip Fault. Three good trips to turn off the MIL.

(K51) ASD CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE

(K51) ASD CONTROL CIRCUIT SHORTED TO GROUND

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Diagnostic Test

1. ASD OPERATION

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

Is the ASD operating?

Yes

Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 2

2. (K51) ASD CONTROL CIRCUIT SHORTED TO VOLTAGE

Stop the ASD actuation.
Turn the ignition off.
Disconnect the C3 PCM harness connector.
Disconnect the C2 TIPM harness connector.
Ignition on, engine not running.
Measure the voltage on the (K51) ASD Control circuit at the C2 TIPM harness connector.

Does the voltmeter indicate voltage present?

Yes

Go To 3

Repair the short to voltage in the (K51) ASD Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

3. (K51) ASD CONTROL CIRCUIT OPEN

Turn the ignition off.

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 Control circuit from the TIPM harness connector to the appropriate terminals of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

Go To 4

Repair the open in the (K51) ASD Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

4. (K51) ASD CONTROL CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K51) ASD Control circuit at the C2 TIPM harness connector.

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (K51) ASD Control circuit.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 5

5. ASD CONTROL OPERATION FROM THE PCM

Connect the C3 PCM harness connector.
Ignition on, engine not running.
Using the scan tool in the PCM, actuate the ASD.
With a 12-volt test light connected to ground, probe the (K51) ASD Control circuit in the C2 TIPM harness connector.

Does the test light illuminate brightly and flash on and off?

Yes

NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
If OK, replace the TIPM in accordance with the Service Information.

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 the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)