Adaptive Cruise Control System

Adaptive Cruise Control (ACC) DTC Troubleshooting: 81

DTC 81:

Engine Control System (Including PCM) Malfunction

1. Check for PGM-FI System DTCs with the HDS Initial Inspection and Diagnostic Overview.

Are any DTCs indicated?

YES -

Troubleshoot the indicated PGM-FI system DTC(s).

NO -

Go to step 2.

2. Clear the DTCs with the HDS.

3. Test-drive the vehicle with the ACC activated.

4. Check for DTCs with the HDS.

Is DTC 81 indicated?

YES -

Check for loose or poor connections. If OK, update the ACC unit Testing and Inspection, then recheck. If the ACC unit was already updated, replace the ACC unit Service and Repair.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections.