88-1

VSA DTC Troubleshooting: 88-1

DTC 88:

Difference in Wheel Speed

NOTE:

- A wheel bearing that is installed backwards can cause this DTC.
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Reading and Clearing Diagnostic Trouble Codes.

1. Check all four tires for size, inflation, and wear Service and Repair.

Are all four tires the correct size, properly inflated, and worn evenly?

YES -

Go to step 2.

NO -

Install the correct tires, a known-good set of tires, or set the tires to the correct pressure, and retest by test-driving.

2. Test-drive the vehicle at 9 mph (15 km/h) or more.

NOTE: Drive the vehicle on the road, not on a lift.

3. Check the RIGHT FRONT, LEFT FRONT, RIGHT REAR, LEFT REAR WHEEL SPEED in the VSA DATA LIST with the HDS

Are all four tires the same indicated value?

YES -

Go to step 4.

NO -

Reinstall or replace the wheel speed sensor(s) Service and Repair, and retest by test-driving.

4. Check all magnetic encoders on the hub bearing units for debris or cracks: Front, rear.

Are they installed correctly and in good condition?

YES -

Go to step 5.

NO -

Clean and reinstall or replace the hub bearing unit(s), and retest by test-driving:

- Front: Reinstall or replace the front hub bearing unit.
- Rear: Reinstall or replace the rear hub bearing unit.

5. Update the VSA modulator-control unit if it does not have the latest software Testing and Inspection.

6. Test-drive the vehicle at 9 mph (15 km/h) or more.

NOTE: Drive the vehicle on the road, not on a lift.

7. Check for DTCs with the HDS.

Is DTC 88 indicated?

YES -

Check for loose terminals in the VSA modulator-control unit 46P 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 -

If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.