DT1.2 Check For Unwarranted ABS Activity

^ Drive vehicle at approximately 32 km/h (20 mph).

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

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

NOTE: In this event, 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 unwarranted ABS activity Symptom Chart. If the pump motor turns on and no pull is felt, the rear speed sensor should be checked using the unwarranted ABS activity Symptom Chart. A - Unwarranted ABS Activity

If a vehicle pulls immediately upon braking and the pump motor does not run, use the vehicle pulls while braking symptom chart to diagnose the concern. E - Vehicle Pulls During Braking

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

YES -- ABS light is not on. Go to symptom A, unwarranted ABS activity. A - Unwarranted ABS Activity

YES -- ABS light comes on and stays on. Go to DT1.7. DT1.7 Obtain Diagnostic Trouble Code

NO -- Other symptoms are detected. Go to DT1.6. DT1.6 Determine Next Diagnostic Step Based on Brake Symptom

NO -- ABS light is not on. Go to DT1.3. DT1.3 Check For High Sensor Gap