Montero Sport V6-3.5L SOHC (2004)
Wheel Speed Sensor: Testing and Inspection
WHEEL SPEED SENSOR OUTPUT VOLTAGE MEASUREMENT
Required 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
^
Wheel speed sensor pole piece-to-ABS rotor clearance too large
^
Faulty wheel speed sensor
4. To observe the waveform with an oscilloscope:
^
Front Wheels:
RWD: Turn the wheels manually at a constant speed.
4WD: Shift into D-range and drive the wheels.
^
Rear Wheels: Shift into D-range and drive the wheels.
NOTE: Waveform may also be observed by driving the vehicles.
NOTE: The output waveform is low when the wheel speed is low. Similarly, it will be higher as the wheel speed increases. Waveform may
also be observed by driving the vehicle.
