Service function guideTraction Control Fault Diagnosis

This guide provides a complete diagnostic procedure for tracing traction control and stability warning lights, covering system operation, preparation, step-by-step testing, result verification, vehicle-specific variations, common mistakes, and aftercare. It is written for working mechanics and experienced DIYers who already understand basic electrical and brake systems. After completing the procedure, the reader will be able to isolate faults in wheel speed sensors, steering angle sensors, yaw rate sensors, hydraulic control units, and associated wiring. The guide emphasizes safe, methodical testing with a scan tool and multimeter while directing the reader to factory service information for exact specifications.