DTC 77-1

DTC 77-1: PCM
Check the PCM for DTCs. Fix the PCM DTCs before troubleshooting DTC 77.
1. Clear the DTCs.
2. Test-drive the vehicle, and watch 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. Test-drive the vehicle, and watch 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 unit.
NO-The system is OK et this time.