3000GT VR-4 AWD V6-2972cc 3.0L DOHC MFI Twin Turbo (1998)
Wheel Speed Sensor: Testing and Inspection
WHEEL SPEED SENSOR OUTPUT VOLTAGE MEASUREMENT
1. Lift up the vehicle and release the parking brake.
2. Disconnect the ABS-Electronic Control Unit (ECU) connector, and then use the special tool MB991219 to measure the output voltage
3. Manually turning the wheel to be measured by 1/2 to 1 turn / second, measure the output voltage with a circuit tester or oscilloscope.
Output voltage:
When measured with circuit tester: 70 mV or more
When measured with oscilloscope (max. voltage): 100 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. Then, in order to observe the output state of the wheel speed sensors, shift into low gear and drive the wheels, observe the output voltage
waveform of each wheel speed sensor with an oscilloscope.
NOTE:
1. Waveform may also be observed by actually driving the vehicle.
2. The output voltage is low when the wheel speed is low and similarly it will be higher as the wheel speed Increases.
