Mazda 3 Service Manual: Front ABS Wheel Speed Sensor Inspection

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_LF

  (LF wheel-speed sensor)

• WSPD_RF

  (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.

Installation Visual Inspection

1. Inspect for the following:

• If there is any malfunction, replace the part.

a. Excessive play of the front ABS wheel-speed sensor

b. Deformation of the front ABS wheel-speed sensor

Clearance Inspection

Preparation prior to inspection

1. Remove the front ABS wheel-speed sensor..

2. Remove the wheel hub, steering knuckle component..

3. Install the front ABS wheel-speed sensor to the removed the wheel hub, steering knuckle component, and tighten to the specified torque.

Tightening torque

• 4.0—6.0 N·m {41—61 kgf·cm, 36—53 in·lbf}

Clearance Inspection

1. Measure the gap between the front ABS sensor rotor and the front ABS wheel-speed sensor using a feeler gauge.

• If not within the specification, verify the following items and repair or replace if necessary.

• Is there deformation or damage to the front ABS sensor rotor?

• Is there deformation or damage to the front ABS wheel speed sensor?

• Is there foreign material adhering?

Clearance

• 2.1 mm {0.082 in} or less

Servicing after inspection

1. Remove the front ABS wheel-speed sensor from the wheel hub, steering knuckle component.

2. Install the wheel hub, steering knuckle component..

3. Install the front ABS wheel-speed sensor..

4. Inspect the front wheel alignment..