VSA System

Control System DTCs

VSA DTC Troubleshooting: 27-21

DTC 27-21 : Steering Angle Sensor Output Signal Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the how to troubleshoot the VSA system Reading and Clearing Diagnostic Trouble Codes.






1. DTC check:

-1. Turn the ignition switch to ON (II).

-2. Clear the DTC with the HDS.

-3. Turn the ignition switch to LOCK (0).

-4. Start the engine, then turn the steering wheel from lock to lock several times.

-5. Test-drive the vehicle at 31 mph (50 km/h) or more.
NOTE: Drive the vehicle on the road, not on a lift.

-6. Check for DTCs with the HDS.






Is DTC 27-21 indicated?
-YES- If DTC 27-21 is only indicated, go to step 2.
-YES- If DTC 86-11 or 86-19 are also indicated, go to DTC 86-11 VSA System or 86-19.
-NO- Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.

2. Steering angle sensor check (substitution):

-1. Turn the ignition switch to LOCK (0).

-2. Substitute a known-good steering angle sensor Steering Angle Sensor Removal And Installation.

-3. Turn the ignition switch to ON (II).

-4. Clear the DTC with the HDS.

-5. Turn the ignition switch to LOCK (0).

-6. Start the engine, then turn the steering wheel from lock to lock several times.

-7. Test-drive the vehicle at 31 mph (50 km/h) or more.
NOTE: Drive the vehicle on the road, not on a lift.

-8. Check for DTCs with the HDS.






Is DTC 27-21 indicated?
-YES- Go to step 3.
-NO- Replace the original steering angle sensor Steering Angle Sensor Removal And Installation.

3. VSA modulator-control unit check (update):

-1. Update the VSA modulator-control unit if it does not have the latest software Programming and Relearning.

-2. Turn the ignition switch to LOCK (0).

-3. Start the engine, then turn the steering wheel from lock to lock several times.

-4. Test-drive the vehicle at 31 mph (50 km/h) or more.
NOTE: Drive the vehicle on the road, not on a lift.

-5. Check for DTCs with the HDS.






Is DTC 27-21 indicated?
-YES- Check for loose terminals in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit Service and Repair.
-NO- Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.