Adaptive Cruise Control/CMBS

Adaptive Cruise Control (ACC) DTC Troubleshooting: 25

DTC 25: Yaw Rate-Lateral/Longitudinal Acceleration Sensor Stabilizing Malfunction

NOTE: If DTC 112 is stored at the same time as DTC 25, troubleshoot DTC 112 first, then recheck for DTC 25.

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. Test-drive the vehicle at 28 mph (45 km/h) or more with the adaptive cruise control (ACC) activated, and watch the ACC indicator.

Does the ACC indicator come on?
YES - Go to step 4.

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


4. Check for DTCs with the HDS.

Is DTC 25 indicated?
YES - Go to step 5.

NO - Troubleshoot the indicated DTC.


5. Test-drive the vehicle in a straight line with the ACC activated, check YAW RATE SENSOR with the HDS.

Is about 2.5 V indicated?
YES - Go to step 6.

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


6. Turn right with the ACC activated, and check YAW RATE SENSOR with the HDS.

Does the voltage increase from 2.5 V?
YES - Go to step 7.

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


7. Turn left with the ACC activated, 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