DTC Troubleshooting

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

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

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

Is DTC P0685 indicated?

YES - Go to step 4.

NO - Intermittent failure, the system is OK at this time. If any other Temporary DTCs or DTCs are indicated, Go to the indicated DTC's troubleshooting.

4. Update the PCM if it does not have the latest software, or substitute a known good PCM.
5. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0685 indicated?

YES - If the PCM was updated, substitute a known good PCM, then recheck. If the PCM was substituted, Go to step 1.

NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Temporary DTCs or DTCs are indicated, Go to the indicated DTC's troubleshooting.