P0685
P0685 - ASD/Main Control Circuit
For wiring diagrams, refer to.
• 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 ASD Relay Control circuit.
• Always perform the pre-diagnostic troubleshooting procedure before proceeding. Refer to => Non-DTC Based Diagnostics. Pre-Diagnostic Troubleshooting Procedure
Test Step 1 - DTC is Active
• Turn the ignition ON.
• With the scan tool, clear DTCs in the PCM.
• With the scan tool, actuate the auto shutdown relay control state.
• With the scan tool, select view DTCs.
Is the status active for this DTC?
Yes
• Go to Test Step 2 => [ Test
Step 2 - Fused B+ Circuit Open or High Resistance ]
No
• Refer to the checking for an intermittent DTC diagnostic procedure. Refer to => Non-DTC Based Diagnostics. Checking for an Intermittent DTC
Test Step 2 - Fused B+ Circuit Open or High Resistance
• Turn the ignition OFF.
• Remove the ASD Relay.
• Using a test lamp connected to ground, check both fused B+ circuits in the auto shutdown relay connector.
• The test lamp should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
Is the test lamp illuminated and bright?
Yes
• Go to Test Step 3 => [ Test
Step 3 - ASD Relay Control Circuit Shorted to Voltage ]
No
• Repair the fused B+ circuits for an open circuit or high resistance.
• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test
Test Step 3 - ASD Relay Control Circuit Shorted to Voltage
• Turn the ignition OFF.
• Disconnect the PCM connector.
• Turn the ignition ON.
• Measure the voltage of the ASD relay control circuit in the auto shutdown relay connector.
Is there any voltage present?
Yes
• Repair the ASD relay control circuit for a short to voltage.
• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test
No
• Go to Test Step 4 => [ Test
Step 4 - ASD Relay Control Circuit Shorted to Ground ]
Test Step 4 - ASD Relay Control Circuit Shorted to Ground
• Turn the ignition OFF.
• Measure the resistance between ground and the ASD relay control circuit in the auto shutdown relay connector.
Is the resistance less than 100 ohms?
Yes
• Repair the ASD relay control circuit for a short to ground.
• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test
No
• Go to Test Step 5 => [ Test
Step 5 - ASD Relay Control Circuit Open or High Resistance ]
Test Step 5 - ASD Relay Control Circuit Open or High Resistance
• Measure the resistance of the ASD relay control circuit between the auto shutdown relay connector and the PCM harness connector.
Is the resistance less than 5.0 ohms?
Yes
• Go to Test Step 6 => [ Test
Step 6 - Auto Shutdown Relay ]
No
• Repair the ASD relay control circuit for an open or high resistance.
• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test
Test Step 6 - Auto Shutdown Relay
• Connect the PCM connector.
• Turn the ignition ON.
• With the scan tool, actuate the auto shutdown relay control state control to the ON position.
• Using a test lamp connected to 12 volts, check the relay control circuit in the auto shutdown relay harness connector.
• 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.
• The test lamp should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
Is the test lamp illuminated and bright?
Yes
• Replace the auto shutdown relay.
• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test
No
• Go to Test Step 7 => [ Test
Step 7 - PCM ]
Test Step 7 - PCM
• Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the auto shutdown relay and the PCM.
• Look for any chafed, pierced, pinched, or partially broken wires.
• Look for broken, bent, pushed out or corroded terminals.
• Refer to any technical service bulletins that may apply.
Were any problems found?
Yes
• Repair as necessary.
• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test
No
• Replace and program the PCM.
• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test