Lancer L4-2.4L SOHC (2005)
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 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.
4. To observe the waveform with an oscilloscope:
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Front Wheels: Shift into low gear and drive the wheels.
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Rear Wheels: Turn the wheels manually at a constant speed
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.
