DTC 78-xx

DTC 78-xx (78-3 to 78-23): SH-AWD Control Unit Self-Diagnostic Malfunction

NOTE: Before you troubleshoot, review the general troubleshooting information.

1. Turn the ignition switch ON (II).
2. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit.
3. Clear the DTC with the HDS.
4. Turn the ignition switch OFF.
5. Turn the ignition switch ON (II).
6. Check for DTCs with the HDS.

Is DTC 78-xx indicated?

YES - Replace the SH-AWD control unit.

NO - Intermittent failure, the system is OK at this time.