P0685

P0685-AUTO SHUTDOWN CONTROL CIRCUIT





For a complete wiring diagram refer to Diagrams/Electrical.


- 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.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.


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. Intermittent Condition
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- 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

No

- Repair the short to voltage in the (K51) ASD Control circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test


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

No

- Repair the open in the (K51) ASD Control circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test


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. Powertrain Verification Test

No

- 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.

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 the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test