Adaptive Cruise Control/CMBS

Adaptive Cruise Control (ACC) DTC Troubleshooting: 23

DTC 23: Yaw Rate-Lateral/Longitudinal Acceleration Sensor Gain Error

NOTE: If DTC 112 is stored at the same time as DTC 23, troubleshoot DTC 112 first, then recheck for DTC 23.

1. Check for VSA system DTCs with the HDS.

Are any DTCs indicated?
YES - Troubleshoot the indicated VSA system DTC(s).

NO - Go to step 2.


2. Clear the DTCs with the HDS.

3. Start the engine.

4. Test-drive the vehicle at 11 mph (18 km/h) or more, and watch the adaptive cruise control (ACC) indicator.

Does the ACC indicator come on?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.


5. Check for DTCs with the HDS.

Is DTC 23 indicated?
YES - Go to step 6.

NO - Troubleshoot the indicated DTC.


6. Test-drive in a straight line at 12.4 mph (20 km/h) or more, and check YAW RATE SENSOR with the HDS.

Is about 2.5 V indicated?
YES - Go to step 7.

NO - Go to VSA system troubleshooting. Initial Inspection and Diagnostic Overview


7. Turn right at 12.4 mph (20 km/h) or more, and check YAW RATE SENSOR with the HDS.

Does the voltage increase from 2.5 V?
YES - Go to step 8.

NO - Go to VSA system troubleshooting. Initial Inspection and Diagnostic Overview


8. Turn left at 12.4 mph (20 km/h) or more, and check YAW RATE S with the HDS.

Does the voltage decrease from 2.5 V?
YES - The yaw rate-lateral/longitudinal acceleration sensor signal is OK, check for loose or poor connections. If OK, replace the ACC unit. Service and Repair

NO - Go to VSA system troubleshooting. Initial Inspection and Diagnostic Overview