Z2 Check For Unwarranted ABS Activity

- Drive vehicle at approximately 20 mph.

NOTE: When conducting the following procedure, the vehicle may pull as soon as the pump motor begins to run. If the vehicle does pull when the pump motor turns on, the front sensor opposite the pull should be checked using the ABS misfire, ABS too sensitive and ABS fires on normal stops Symptoms Chart. If the pump motor turns On and no pull is felt, the rear sensor should be checked using the ABS misfire, ABS too sensitive and ABS fires on normal stops Symptoms Chart.

If a vehicle pulls immediately upon braking and the pump motor does not run, use the vehicle pulls Symptom Chart to diagnose the concern.

- Turn off the windshield wipers if they are on. Feel for pulsation in the brake pedal.

- Perform a light to medium (normal traffic) stop.

- Does the pump motor turn on and are brake pedal pulsations felt any time during the stop?

YES -- And amber ABS warning light is not on. Go to Symptom Chart. Symptom Related Diagnostic Procedures

YES -- And amber ABS warning light comes on and stays on. Go to Z7. Z7 Obtain DTC

NO -- But other symptoms are detected. Go to Z6. Z6 Determine Next Diagnostic Step Based on Brake Symptom

NO -- And amber ABS warning light is not on. Go to Z3. Z3 Check For Marginally High Sensor Gap