P0685

DTC P0685: ECM/PCM Internal Circuit Malfunction (Power Control Circuit)

NOTE:
- If the problem does not return after you clear the DTCs or if this DTC is stored intermittently, check for loose terminals at the IGP line connectors before replacing the ECM/PCM.
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.

NO - Intermittent failure, system is OK at this time.