Mazda 3 Service Manual: Rear ABS Wheel Speed Sensor Inspection

Installation Visual Inspection

1. Inspect for the following:

• If there is any malfunction, replace the part.

a. Excessive looseness or play of the rear ABS wheel-speed sensor

b. Deformation of the rear ABS wheel-speed sensor

c. Deformation or damage of the rear ABS sensor rotor

Clearance Inspection

1. Remove the rear ABS wheel-speed sensor.

2. Measure the distance between the rear ABS wheel-speed sensor installation surface and the rear ABS sensor rotor. This is dimension A.

3. Calculate the clearance between the rear ABS wheel-speed sensor and the rear ABS sensor rotor using the following formula:

• Clearance (mm {in}) = A –13.9 {0.547}

4. Verify that the clearance between the rear ABS sensor rotor and the rear ABS wheel-speed sensor is as indicated below.

• If there is any malfunction, replace it.

Clearance

• 1.46 mm {0.057 in} or less

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. Switch the ignition to off.

2. Connect the M-MDS to the DLC-2.

3. Select the following PIDs using the M-MDS:

• WSPD_LR

  (LR wheel-speed sensor)

• WSPD_RR

  (RR 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 rear ABS wheel-speed sensor.