Wheel Speed Sensor: Testing and Inspection

TESTING THE WHEEL SPEED SENSOR

FRONT

Front Wheel Sensor/Gear Pulser Inspection:

1. Check the pulser for chipped or damaged teeth and replace if necessary.
2. Measure the air gap between the sensor and pulser all the way around while rotating the driveshaft by hand.

Standard: 0.02-0.04 in (0.4-1.0 mm)

NOTE: If the gap exceeds 0.04 in (1.0 mm) at any point, the probability is a distorted knuckle, which should be replaced.

REAR

Rear Wheel Sensor/Gear Pulser Inspection:

1. Remove the rear caliper assembly.
2. Remove the rear brake disc.
3. Check the rear pulser for chipped or damaged teeth and replace if necessary.
4. Measure the air gap between the sensor and pulser all the way around while rotating the hub bearing unit by hand.

Standard: 0.02-0.04 in (0.4-1.0 mm)

NOTE: If the gap exceeds 0.04 in (1.0 mm) at any point, the probability is a distorted knuckle, which should be replaced.

WHEEL SENSOR SIGNAL CONFIRMATION

NOTE: Use the ALB checker (mode "0") to confirm proper wheel sensor operation.

ALB Checker Connection To The ABS Connector:

1. Disconnect the ABS inspection connector (6P) from the connector cover located on the cross-member under the passenger's seat and connect the ABS inspection connector (6P) to the ALB checker.
2. Raise the car so that all four wheels are off the ground and support on safety stands.
3. Turn the ignition switch ON.

ALB Checker:

4. Turn the Mode Selector switch to "0".
5. With the transmission in neutral, rotate each wheel briskly (one revolution per second) by hand, and confirm that its respective monitor light on the checker blinks as the wheel rotates.

NOTE:
^ Rotating a wheel too slowly will produce only a weak blink of its monitor light that may be difficult to see.
^ In bright sunlight, the monitor light may be difficult to see. Perform tests in a shaded area.
^ In some instances, it may not be possible to spin the front wheels fast enough to get a monitor indication. If necessary, start the engine and slowly accelerate and decelerate the front wheels. The monitor lights should blink, indicating a good wheel sensor signal.
^ If any monitor light fails to blink, check the suspected sensor, its air gap and its wiring/connectors.