2008 - MX-5 - Brakes

FRONT ABS WHEEL-SPEED SENSOR INSPECTION

Installation Visual Inspection

1. Inspect the following items:

• If there is any malfunction, replace the applicable part.

a. Excessive play of the ABS wheel-speed sensor

b. 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.