Mazda MX-5 Miata / Grand Touring. Manual — part 23

FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION

1. Remove the mudguard.

2. Remove in the order indicated in the table.

M

RF wheel-

speed sensor

(signal)

RF ABS

wheel-speed

sensor

Continuity

M-RF ABS

wheel-speed

sensor

connector

terminal A

Continuity

detected

harness (M-

RF ABS

wheel-speed

sensor

connector

terminal A)

N

Brake switch Brake switch

Voltage

N-brake switch

(Brake pedal

depressed)

B+



Wiring

harness (N-

brake

switch)



Brake

switch

Y-brake switch

(Brake pedal

not depressed)

1 V or less

O

RF wheel-

speed sensor

(ground)

RF ABS

wheel-speed

sensor

Continuity

O-RF ABS

wheel-speed

sensor

connector

terminal B

Continuity

detected



Wiring

harness (O-

RF ABS

wheel-speed

sensor

connector

terminal B)

P

-

-

-

-

-

-

Q

-

-

-

-

-

-

R

-

-

-

-

-

-

S

-

-

-

-

-

-

T

-

-

-

-

-

-

U

-

-

-

-

-

-

V

-

-

-

-

-

-

W

-

-

-

-

-

-

X

-

-

-

-

-

-

Y

CAN_L

DLC-2

(CAN_L)

Continuity

Y-DLC-2

terminal

CAN_L.

Continuity

detected



Wiring

harness (Y-

DLC-2

terminal

CAN_L)

Z

CAN_H

DLC-2

(CAN_H)

Continuity

Z-DLC-2

terminal
CAN_H

Continuity

detected



Wiring

harness (Z-

DLC-2

terminal

CAN_H)

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Antilock Brake System - MX-5 Miata

3. Install in the reverse order of removal.

Fig. 11: Identifying Front ABS Wheel-Speed Sensor (With Torque Specifications)
Courtesy of MAZDA MOTORS CORP.

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.

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Antilock Brake System - MX-5 Miata

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}

Fig. 12: Measuring Distance Between Front ABS Wheel-Speed Sensor Installation Surface & ABS
Wheel-Speed Sensor Tip
Courtesy of MAZDA MOTORS CORP.

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Antilock Brake System - MX-5 Miata

SENSOR OUTPUT VALUE INSPECTION

1. Turn the ignition switch off.

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

Fig. 13: Locating DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.

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



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 or equivalent shows the same value as the speedometer.

CAUTION:



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

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Antilock Brake System - MX-5 Miata