P0685

P0685-ASD/MAIN CONTROL CIRCUIT





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the control circuit active and battery voltage greater than 10.4 volts.

- Set Condition:
The PCM detects an open or shorted condition in the (K51) ASD Relay Control circuit.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. DTC IS ACTIVE
Turn the ignition on.
With the scan tool, Clear DTCs in the Powertrain Control Module (PCM).
With the scan tool, actuate the Auto Shutdown (ASD) Relay Control State.
With the scan tool, select View DTCs.
Is the DTC Active at this time?

Yes

- Go to 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking For An Intermittent DTC

2. FUSED B(+) CIRCUIT OPEN OR HIGH RESISTANCE
Turn the ignition off.
Remove the ASD Relay.
Using a 12 volt test light connected to ground, check both Fused B(+) circuits in the Auto Shutdown Relay connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Go to 3

No

- Repair the Fused B(+) circuit(s) for an open circuit or high resistance.
- Perform the PCM Verification Test. Powertrain Verification Test

3. (K51) ASD RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the C3 Powertrain Control Module (PCM) harness connector.
Turn the ignition on.
Measure the voltage of the (K51) ASD Relay Control circuit in the Auto Shutdown Relay connector.
Is there any voltage present?

Yes

- Repair the short to voltage in the (K51) ASD Relay Control circuit.
- Perform the PCM Verification Test. Powertrain Verification Test

No

- Go to 4

4. (K51) ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (K51) ASD Relay Control circuit in the Auto Shutdown Relay connector.
Is the resistance below 100 ohms?

Yes

- Repair the (K51) ASD Relay Control circuit for a short to ground.
- Perform the PCM Verification Test. Powertrain Verification Test

No

- Go to 5

5. (K51) ASD RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (K51) ASD Relay Control circuit between the Auto Shutdown Relay connector and the Powertrain Control Module (PCM) harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go to 6

No

- Repair the open or high resistance in the (K51) ASD Relay Control circuit.
- Perform the PCM Verification Test. Powertrain Verification Test

6. AUTO SHUTDOWN RELAY
Connect the C3 Powertrain Control Module (PCM) harness connector.
Turn the ignition on.
With the scan tool, actuate the Auto Shutdown (ASD) Relay Control State control to the ON position.
Using a 12 volt test light connected to 12 volts, check the (K51) ASD Relay Control circuit in the Auto Shutdown Relay harness connector.

NOTE: If the DTC is active, the actuation test may not be allowed by the PCM. If may be necessary to clear the DTCs before starting the actuation.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Replace the Auto Shutdown Relay.
- Perform the PCM Verification Test. Powertrain Verification Test

No

- Go to 7

7. POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Auto Shutdown Relay and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test. Powertrain Verification Test

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification Test. Powertrain Verification Test