DTC P0685: ECM/PCM Power Control Circuit/Internal Circuit Malfunction
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- If the problem doesn't return after you clear the DTC, or it this DTC is stored intermittently, check for loose terminals at the IGP line connectors before replacing the ECM/PCM.
- Turn the ignition switch ON (II).
- Clear the DTC with the HDS.
- Start the engine, then let it idle for 30 seconds.
- Turn the ignition switch OFF.
- Start the engine, then let it idle for 30 seconds.
- Turn the ignition switch OFF.
- Turn the ignition switch ON (II).
- Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0685 indicated?
YES -Go to step 9.
NO -Intermittent failure, the system is OK at this time.
- Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
- Start the engine, then let it idle for 30 seconds.
- Turn the ignition switch OFF.
- Start the engine, then let it idle for 30 seconds.
- Turn the ignition switch OFF.
- Turn the ignition switch ON (II).
- Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0685 indicated?
YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 10. If the ECM/PCM was substituted, go to step 1.
NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.