Diagnostic Strategies

How to Troubleshoot DTCs

Check and clear the DTCs with the HDS. Before troubleshooting, check and note these items:
- Ask the customer about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting.
- If the symptom does not appear and the adaptive cruise control (ACC) indicator does not come on during the test-drive, but troubleshooting is done based on the 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 same conditions as when the DTC was originally set. Make sure the adaptive cruise control (ACC) indicator does not come on.
- The adaptive cruise control (ACC) system sometimes stops control because of the environment (weather, road conditions, driving conditions, etc.). A DTC may be stored in these cases.

DTCs that may be stored even when the system is normal:

DTC 83: Adaptive cruise control indicator (ACC) does not come on
Performance of the millimeter wave radar unit is not stable. (Driving behind a target vehicle that caused unstable reception.)

DTC 84: Adaptive cruise control (ACC) indicator does not come on
Target vehicle comes closer than the millimeter wave radar unit detecting limits (The target vehicle brakes suddenly, etc.).

DTC 85: Adaptive cruise control (ACC) indicator does not come on
Extensive driving on a rough road or a winding road, or VSA system detects problem.

DTC 86: Adaptive cruise control (ACC) indicator does not come on
Abnormal tire pressure, flat tire.

DTC 87: Adaptive cruise control (ACC) indicator does not come on
Adaptive cruise control (ACC) brake works continuously, or adaptive cruise control (ACC) brake control is temporarily prohibited by a communication line error detected between the adaptive cruise control (ACC) unit and VSA modulator-control unit.

DTC 88: Adaptive cruise control (ACC) indicator does not come on
Millimeter wave radar unit temperature is high, millimeter wave radar unit supply voltage is low, or out of detection area.

DTC 89: Adaptive cruise control (ACC) indicator does not come on
Front wheel spin

DTC 91: Adaptive cruise control (ACC) indicator does not come on
Vehicle skidded, spun out, or abrupt steering wheel movements.

DTC 93: Adaptive cruise control (ACC) indicator does not come on
Target vehicle comes closer than the millimeter wave radar detecting limits.

DTC 94: Adaptive cruise control (ACC) indicator does not come on
Rear tire problem (different diameter of tires, flat tire, or large air pressure differential).

DTC 95: Adaptive cruise control (ACC) indicator does not come on
Power supply voltage is too high.

DTC 96: Adaptive cruise control (ACC) indicator does not come on
Power supply voltage is too low.

DTC 99: Adaptive cruise control (ACC) indicator does not come on
Detects acceleration or deceleration that is out of the normal system operating range.

DTC 100: Adaptive cruise control (ACC) indicator does not come on
CMBS initial check is incomplete.

DTC 101: Adaptive cruise control (ACC) indicator does not come on
Rear wheel locked (driving with the parking brake applied, or the parking brake stuck).

DTC 107: Adaptive cruise control (ACC) indicator comes on
Millimeter wave radar unit aiming is incomplete.