Montero XLS 4WD V6-3.5L SOHC (2001)
Wheel Speed Sensor: Testing and Inspection
Wheel Speed Sensor
WHEEL SPEED SENSOR OUTPUT VOLTAGE CHECK
Required Special Tool:
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MB991219: Inspection Harness
NOTE: Two ECUs of the same type are situated up and down in a row at the inner part of the floor console. The upper side ECU is the ABS-ECU to
which a blue connector is connected. The lower side ECU is the transfer ECU to which a green connector is connected.
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 turn the wheel to be measured 1/2 to 1 turn/second. Measure the output voltage with a voltmeter or oscilloscope.
Output voltage:
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Minimal voltmeter reading: 42 mV
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Maximum voltmeter reading: 300 mV
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Minimal oscilloscope reading: 120 mV
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Maximum oscilloscope reading: 600 mV
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
NOTE: Check the connection of the sensor harness and connector before using the oscilloscope.