REAR ABS WHEEL-SPEED SENSOR INSPECTION

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Visual Inspection

1.  Inspect the sensor for looseness and damage. Replace the sensor if necessary.

Clearance Inspection

1.  Remove the ABS wheel-speed sensor.

2.  Measure the length A and B shown in the figure using vernier calipers.

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3.  Subtract B from A then verify the clearance between the wheel-speed sensor and the sensor rotor.

•  If not as specified, replace the defective part(s). (ABS wheel-speed sensor, ABS sensor rotor, rear axle shaft and rear axle housing etc.)

Resistance Inspection

1.  Disconnect the ABS wheel‐speed sensor connector.

2.  Inspect the resistance at the ABS wheel‐speed sensor.

•  If not as specified, replace the ABS wheel‐speed sensor.

Voltage Inspection

1.  On level ground, jack up the vehicle and support it evenly on safety stands.

2.  Disconnect the ABS wheel‐speed sensor connector.

3.  Inspect each sensor by rotating each wheel one revolution per second.

•  If not as specified, replace the ABS wheel‐speed sensor.

Voltage Pattern Inspection

1.  Jack up the vehicle on level ground and support it evenly on safety stands.

2.  Disconnect the ABS wheel‐speed sensor connector.

3.  Using an oscilloscope, inspect voltage pattern for distortion and noise by rotating each wheel.

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•  If there is distortion or noise, inspect the ABS sensor rotor.