Antilock Brake System

FRONT ABS WHEEL-SPEED SENSOR INSPECTION

Installation Visual Inspection
1. Inspect the following items:
^ If there is any malfunction, replace the applicable part.

1) Excessive play of the ABS wheel-speed sensor
2) Deformation of the ABS wheel-speed sensor

Clearance Inspection
1. Remove the front ABS wheel-speed sensor.
2. Measure the distance between the front ABS wheel-speed sensor installation surface and the ABS sensor rotor. This is dimension A.





3. Measure the distance between the front ABS wheel-speed sensor installation surface and the tip of ABS wheel speed sensor. This is dimension B.
4. Calculate the clearance between the front ABS wheel-speed sensor and the ABS sensor rotor using the following formula:
Clearance (mm (in)) = A - B
5. Verify that the clearance between the ABS sensor rotor and the front ABS wheel-speed sensor is as indicated below.
^ If there is any malfunction, replace it.

Clearance 0.3-1.0 mm (0.012-0.057 in)

Sensor Output Value Inspection

Caution
^ Resistance inspection using other testers may cause damage to the ABS wheel-speed sensor internal circuit. Be sure to use the M-MDS to inspect the ABS wheel-speed sensor.

1. Turn the ignition switch off.
2. Connect the M-MDS to the DLC-2.





3. Select the following PIDs using the M-MDS:
^ LF_WSPD
(LF wheel-speed sensor)
^ RF_WSPD
(RF wheel-speed sensor)

4. Start the engine and drive the vehicle.
5. Verify that the display of the M-MDS shows the same value as the speedometer.
^ If there is any malfunction, replace the front ABS wheel-speed sensor.