Mazda MX-5 Miata / Grand Touring. Manual — part 72

Fig. 20: Identifying Steering Angle Sensor Connector Terminals
Courtesy of MAZDA MOTORS CORP.

3. Turn the ignition switch to the ON position, then measure the voltage between steering angle sensor

terminal A and ground.



If there is any malfunction, inspect the wiring harness between steering angle sensor terminal A and
ignition switch, then repair or replace if necessary.

Standard voltage

B+

4. Measure the voltage between steering angle sensor terminal H and the ground.



If there is any malfunction, inspect the wiring harness between steering angle sensor terminal H and
ground point, then repair or replace if necessary.

Standard voltage

0 V

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Dynamic Stability Control - MX-5 Miata

5. Turn the ignition switch off.

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

7. Select the SWA_POS PID.

8. Verify the SWA_POS changes when the steering wheel is turned to the left and right.



If there is any malfunction, replace the steering angle sensor.

Standard

When the steering wheel is turned to the right:

SWA_POS changes positively.

When the steering wheel is turned to the left:

SWA_POS changes negatively.

Fig. 21: Locating DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.

STEERING ANGLE SENSOR INITIALIZATION PROCEDURE

WARNING:



Unless the initialization procedure of the steering angle sensor is

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Dynamic Stability Control - MX-5 Miata

1. Inspect the wheel alignment, inflation pressure, and the installation condition of the steering wheel.



If there is any malfunction, adjust the applicable part.

2. Connect the negative battery cable.

3. Turn the ignition switch to the ON position.

4. Confirm that the DSC indicator light illuminates and that the DSC OFF light flashes.

5. Turn the steering wheel to full right lock, then turn it to full left lock.

6. Confirm that the DSC OFF light goes out.

7. Turn the ignition switch off.

8. Turn the ignition switch to the ON position again, and confirm that the DSC indicator light goes out.



If the DSC indicator light does not go out, disconnect the negative battery cable, and perform the
procedure again starting from Step 2 shown above.

9. Drive the vehicle for approx. 10 min , and confirm that the ABS warning and DSC indicator lights do

not illuminate.

DSC OFF SWITCH REMOVAL/INSTALLATION

1. Remove the side panel. (See SIDE PANEL REMOVAL/INSTALLATION .)

2. Remove in the order indicated in Fig. 22 .

completed, the DSC will not operate, causing an unexpected
accident. Therefore, always perform the initialization procedure to
ensure DSC operation if the power supply to the steering angle
sensor has been cut off due to disconnection of the steering angle
sensor connector or negative battery cable, or any other cause.

NOTE:



The initialization value of the steering angle sensor is stored using the
battery power supply. Therefore, the battery power supply of the steering
angle sensor is cut and the stored initialization value is cleared when any
of the following items are performed.



Negative battery cable disconnection



Steering angle sensor connector disconnection



Fuse (ROOM 15A) removal



Wiring harness disconnection between battery and steering angle
sensor connector

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Dynamic Stability Control - MX-5 Miata

Fig. 22: Identifying DSC OFF Switch
Courtesy of MAZDA MOTORS CORP.

3. Install in the reverse order of removal.

DSC OFF SWITCH CONNECTOR REMOVAL NOTE

1. Access the DSC OFF switch connector from behind of the dashboard, and squeeze the tabs of the switch

connector.

2. Disconnect the DSC OFF switch connector from the DSC OFF switch.

DSC OFF SWITCH REMOVAL NOTE

1. Access the DSC OFF switch from behind of the dashboard, and squeeze the tabs of the switch.

2. Pull the DSC OFF switch towards the driver's side to remove it.

DSC OFF SWITCH INSPECTION

1. Remove the DSC OFF switch.

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Dynamic Stability Control - MX-5 Miata