P0685-ASD RELAY CONTROL CIRCUIT SHUTS OFF TOO EARLY
For a complete wiring diagram Refer to Section 8W
- When Monitored:
During after-run.
- Set Condition:
The internal ECM timer determines that the ASD Relay has shut off before the AFTER-RUN mode of operation has been completed.
| Possible Causes |
| CHECK FOR OTHER DTCS |
| INTERMITTENT CONDITION |
| SUBSTITUTE ASD RELAY |
| ASD RELAY CONTROL CIRCUIT OPEN INTERMITTENTLY |
| ENGINE CONTROL MODULE |
Diagnostic Test
1. CHECK FOR OTHER DTCSTurn the ignition on.
With the scan tool, check for additional DTCs.
Are other DTCs present?
Yes
- Refer to the Symptom List for diagnosis of the other DTCs before continuing.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Go To2
2. CLEAR CODE AND CHECK IF THE DTC RESETS
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Perform several ignition key cycles, pausing for at least 20 seconds between each cycle.
Turn the ignition on.
With the scan tool, read ECM DTCs.
Did this DTC set again?
Yes
- Go To3
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
3. ASD RELAY
Turn the ignition off.
Install a substitute relay in place of the ASD Relay.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Perform several ignition key cycles, pausing for at least 10 seconds between each cycle.
Turn the ignition on.
With the scan tool, read ECM DTCs.
Did this DTC set again?
Yes
- Go To4
No
- Replace the ASD Relay.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4. ASD RELAY CONTROL CIRCUIT OPEN INTERMITTENTLY
Turn the ignition off.
Remove the ASD Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance of the ASD Relay Control circuit while wiggling the wiring harness and connectors between the ECM and the PDC.
Was the resistance above 10.0 ohms at any time while wiggling the wiring harness and connectors?
Yes
- Repair the ASD Relay Control circuit for an intermittent open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Replace and program the Engine Control Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).