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Home >> Mitsubishi >> 1993 >> Montero Base, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnosis & Testing >> Code 15 >> Faulty Wheel Speed Sensor Output
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Faulty Wheel Speed Sensor Output

  1. Test each sensor. See WHEEL SPEED SENSOR under COMPONENT TESTING. If all sensor voltages and resistances are within specification, go to next step. If any sensor is malfunctioning, replace speed sensor. See WHEEL SPEED SENSOR under REMOVAL & INSTALLATION.
  2. Check each wheel speed sensor-to-rotor gap. See WHEEL SPEED SENSOR under ADJUSTMENTS. If all gaps are within specification, go to next step. If any gaps are not within specification, adjust sensor-to-rotor gap.
  3. Inspect all wheel speed sensor rotors for damaged and missing teeth. Replace any damaged rotors. Using an oscilloscope, check wave-form patterns. See Fig 1 . If all rotors are okay, replace ECU. Ensure trouble code does not reset.
Fig 1: Identifying Abnormal ABS Rotor Wave-Form Patterns
G93B00266Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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