DTC P0685: 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 if this DTC is stored intermittently, check for loose terminals at the IGP line connectors before replacing the 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 PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a known-good PCM (see HOW TO SUBSTITUTE THE 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 PCM was updated, substitute a known-good PCM (see HOW TO SUBSTITUTE THE PCM ), then go to step 10. 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 (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.