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Home >> Jeep >> 2003 >> Liberty Renegade, 4WD, Automatic, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Electronic Testing >> Left Front, Right Front Or Rear Wheel Speed Signal Failure >> Testing

Left Front, Right Front Or Rear Wheel Speed Signal Failure: Testing

    NOTE: The CAB must sense ALL 4 wheels at 25 km/h (15 mph) before it will extinguish the ABS indicators.
  1. Turn the ignition on. With the DRBIII®, read DTC's. With the DRBIII®, read Freeze Frame information. Does the DRBIII® display WHEEL SPEED/SIGNAL FAILURE and SENSOR CIRCUIT FAILURE? Yes, refer to the affected Wheel Speed Sensor Circuit Failure for the related symptom(s). See ABS VERIFICATION TEST VER-1 . No, go to next step.
  2. Turn the ignition on. With the DRBIII® in Sensors, monitor ALL the Wheel Speed Sensor Signals while an assistant drives the vehicle. Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph). Is the affected Wheel Speed Signal showing 0 km/h (0 mph)? Yes, go to next step. No, the condition is not present at this time. Monitor the DRBIII® parameters while wiggling the related wiring harness. Refer to any Technical Service Bulletins (TSB's) that may apply. Visually inspect the related wiring harness and connector terminals. See ABS VERIFICATION TEST VER-1 .
  3. Turn the ignition off. Inspect the CAB connector, affected Wheel Speed Sensor, and affected Wheel Speed Sensor connector. Is the Wheel Speed Sensor or any connector damaged? Yes, repair as necessary. See ABS VERIFICATION TEST VER-1 . No: Go to next step.
    4. NOTE: The tone wheel teeth should be perfectly square, not bent, or nicked.
  4. Turn ignition off. Inspect the affected Tone Wheel for damaged, missing teeth, cracks, or looseness. Is the affected Tone Wheel OK? Yes, go to next step. No, replace the Tone Wheel in accordance with the service information. See ABS VERIFICATION TEST VER-1 .
    5. NOTE: Refer to appropriate service information, if necessary, for procedures or specifications.
  5. Turn the ignition off. Using a Feeler Gauge, measure the affected Wheel Speed Sensor Air Gap. Is the Air Gap OK? Yes, go to next step. No, repair as necessary. See ABS VERIFICATION TEST VER-1 .
    6. NOTE: Refer to appropriate service information, if necessary, for procedures or specifications.
  6. Turn the ignition off. Inspect the wheel bearings for excessive runout or clearance. Is the bearing clearance OK? Yes, go to next step. No, repair as necessary. See ABS VERIFICATION TEST VER-1 .
  7. Turn the ignition off. Visually inspect brakes for locking up due to lining contamination of overheating. Inspect all components for defects which may cause a signal DTC to set. Is any component damaged? Yes, repair as necessary. See ABS VERIFICATION TEST VER-1 . No, refer to symptom SENSOR CIRCUIT FAILURE for further diagnostics. See ABS VERIFICATION TEST VER-1 .
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