DTC 77-1

DTC 77-1: PCM

NOTE:
^ Before you troubleshoot, review the general troubleshooting information.
^ Check the fuel and emissions system DTCs. If there is a DTC, troubleshoot the indicated DTC first, then troubleshoot DTC 77.

1. Turn the ignition switch ON (II).
2. Clear the DTC.
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.