DTC 77-1

DTC 77-1: PCM

NOTE:
^ Before you troubleshoot, review the general troubleshooting information.
^ Check the PCM for DTCs. Diagnose and repair the PCM DTCs before troubleshooting DTC 77.

1. Turn the ignition switch ON (II).
2. Clear the DTCs with the HDS.
3. Test-drive the vehicle, and check for DTCs with the HDS.
Is DTC 77-1 indicated?
YES - Go to step 4.
NO - Intermittent failure, the system is OK at this time.
4. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
5. Test-drive the vehicle, and check for DTCs with the HDS.
Is DTC 77-1 indicated?
YES - Check for loose terminal fit in the VTM-4 control unit. If it is normal, replace the VTM-4 control unit.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.