P068A-ASD/MAIN RELAY OFF TOO EARLY
For a complete wiring diagram Refer to Section 8W
- When Monitored:
When the ignition is turned off, during after-run mode of operation.
- Set Condition:
The internal ECM timer determines that the Main Relay has shut off before the AFTER-RUN mode of operation has been completed.
| Possible Causes |
| CHECK FOR OTHER DTCS |
| INTERMITTENT CONDITION |
| SUBSTITUTE MAIN RELAY |
| (K51) MAIN RELAY CONTROL CIRCUIT OPEN INTERMITTENTLY |
| ENGINE CONTROL MODULE |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
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 To 2
2. CLEAR CODE AND CHECK IF THE DTC RESETS
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 To 3
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
3. MAIN RELAY
Turn the ignition off.
Install a known good relay in place of the Main 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 To 4
No
- Replace the Main Relay.
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
4. (K51) MAIN RELAY CONTROL CIRCUIT OPEN INTERMITTENTLY
Turn the ignition off.
Remove the Main Relay.
Disconnect the ECM harness connectors.
Measure the resistance of the Main Relay Control circuit while wiggling the wiring harness and connectors between the ECM and Main Relay connector.
Was the resistance above 10.0 ohms at any time while wiggling the wiring harness and connectors?
Yes
- Repair the Main 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)