DTC 77

DTC 77: PCM
Check the PCM for DTCs. Repair the cause for the PCM DTCs before troubleshooting DTC 77.
1. Clear the DTC.
2. Test-drive the vehicle, and watch for the VTM-4 indicator.
Does the VTM-4 indicator come on?
YES-Go to step 3.
NO-The system is OK at this time.
3. Replace the PCM, and test-drive the vehicle again, and watch for the VTM-4 indicator.
Does the VTM-4 indicator come on?
YES-Check for loose terminal fit in the VTM-4 control unit. If it is normal, replace the VTM-4 control unites
NO-The system is OK at this time.