Montero Sport XLS 4WD V6-3.0L SOHC (1999)
Wheel Speed Sensor: Testing and Inspection
WHEEL SPEED SENSOR OUTPUT VOLTAGE MEASUREMENT
Requires Special Tool: MB991219: Inspection Harness
1. Lift up the vehicle and release the parking brake.
2. Disconnect the ABS-ECU connector, and then use special tool MB991219 to measure the output voltage at the harness side connector.
3. Manually turning the wheel to be measured by 1/2 to 1 turn/second, measure the output voltage with a voltmeter or oscilloscope.
Output voltage:
When measured with voltmeter: 70 mV or more
When measured with oscilloscope (maximum voltage): 200 mV or more
Probable causes of low output voltage
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Wheel speed sensor pole piece-to-ABS rotor clearance too large
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Faulty wheel speed sensor
4. To observe the waveform with an oscilloscope:
Front Wheels: Shift into low gear and drive the wheels.
Rear Wheels: Turn the wheels manually at a constant speed.
NOTE:
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Waveform may also be observed by driving the vehicle.
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The output voltage is low when the wheel speed is low Similarly, it will be higher as the wheel speed increases.
Points In Waveform Measurement
