Sebring LX Coupe V6-3.0L VIN H (2002)
Wheel Speed Sensor: Testing and Inspection
WHEEL SPEED SENSOR OUTPUT VOLTAGE MEASUREMENT
Required Special Tool:
-
MB99121 9: 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:
-
Minimal voltmeter reading: 42 mV
-
Maximum voltmeter reading: 300 mV
-
Minimal oscilloscope reading: 120 mV
-
Maximum oscilloscope reading: 600 mV
Probable causes of low output voltage
-
Wheel speed sensor pole piece-to-ABS rotor clearance too large
-
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:
-
Front Wheels: Shift into low gear and drive the wheels.
-
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.