How to Troubleshoot DTCs

Check for DTCs with the HDS. Make a copy of the freeze data, then clear the DTC.

Before troubleshooting, check and pay attention to these items:

• Ask the client about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting.
• If the symptom does not appear and the ACC indicator does not come on while test-driving, but if your troubleshooting was based on a DTC, check for poor connections or loose terminals at all connectors related to the circuit that you are troubleshooting.
• After the troubleshooting or repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions as when the DTC was originally set. Make sure the ACC indicator does not come on.
• The ACC system sometimes stops operating because of certain environmental conditions (weather, road conditions, driving conditions, etc.). A DTC may be stored in these cases:

DTC may be stored even when the system is OK: 

NOTE:  The ACC indicator does not come on when B2A00-F8: ACC Brake Control Temporarily Prohibited is stored.