DTC P0685: ECM/PCM Power Control Circuit/Internal Circuit Malfunction
NOTE:
- Before you troubleshoot, record ail freeze data and any on-board snapshot, and review 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 to ON (II).
- Clear the DTC with the HDS.
- Start the engine, and let it idle for 30 seconds.
- Turn the ignition switch to LOCK (0).
- Start the engine, then let it idle for 30 seconds.
- Turn the ignition switch to LOCK (0).
- Turn the ignition switch to ON (II).
- Check for Pending or Confirmed 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 ECM/PCM UPDATE ), 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 to LOCK (0).
- Start the engine, then let it idle for 30 seconds.
- Turn the ignition switch to LOCK (0).
- Turn the ignition switch to ON (II).
- Check for Pending or Confirmed 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 Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.