Mazda MX-5 Miata / Grand Touring. Manual — part 66

BRAKE PRESSURE REDUCTION

4. Send the command while depressing on the brake pedal and attempting to rotate the wheel being

inspected.

5. While brake pressure is maintained and a DSC HU/CM operation click sound is heard, confirm that the

V_TRC_L

OFF

V_TRC_R

V_STB_L

V_STB_R

LF_INLET

ON

OFF

OFF

OFF

LF_OUTLET

OFF

LR_INLET

ON

LR_OUTLET

OFF

RF_INLET

ON

RF_OUTLET

OFF

RR_INLET

ON

RR_OUTLET

OFF

PMP_MOTOR

Command name

Inspected wheels

LF RF LR RR

V_TRC_L

OFF

V_TRC_R

V_STB_L

V_STB_R

LF_INLET

ON

OFF

OFF

OFF

LF_OUTLET

LR_INLET

OFF

ON

LR_OUTLET

RF_INLET

ON

OFF

RF_OUTLET

RR_INLET

OFF

ON

RR_OUTLET

PMP_MOTOR

ON

CAUTION:



To protect the DSC HU/CM, the solenoid valve and the pump
motor used during active command mode stay on for only 10 s
or less each time they are switched on.

NOTE:



When working with two people, one should press on the brake pedal,
and the other should attempt to rotate the wheel being inspected.

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Dynamic Stability Control - MX-5 Miata

wheel does not rotate. While brake pressure is being reduced and an DSC HU/CM operation click sound
is heard, confirm that the wheel rotates.



Performing the inspection above determines the following:



The DSC HU/CM brake lines are normal.



The DSC HU/CM hydraulic system is not significantly abnormal (including DSC HU/CM).



The DSC HU/CM internal electrical parts (solenoid, motor and other parts) are normal.



The DSC unit and DSC HU/CM output system wiring harnesses (solenoid valve, relay
system) are normal.



However, the following items cannot be verified.



Malfunction with intermittent occurrence of the above items



Malfunction of DSC HU/CM input system wiring harnesses and parts



Extremely small leaks in the DSC HU/CM internal hydraulic system

DSC CONTROL INSPECTION

1. Perform "Preparation".

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

3. Set up an active command mode inspection according to the combination of commands below.

CAUTION:



To protect the DSC HU/CM, the solenoid valve and the pump
motor used during active command mode stay on for only 10 s
or less each time they are switched on.

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Dynamic Stability Control - MX-5 Miata

Fig. 4: Locating DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.

ACTIVE COMMAND MODE INSPECTION

4. Send the command while rotating the wheel being inspected by hand in a forward direction.

Command name

Inspected wheels

Understeer control inhibited Oversteer control inhibited

LF

RF

LR

RR

V_TRC_L

ON

OFF

ON

V_TRC_R

OFF

ON

OFF

V_STB_L

OFF

V_STB_R

LF_INLET

OFF

OFF

OFF

ON

LF_OUTLET

OFF

LR_INLET

ON

LR_OUTLET

OFF

RF_INLET

ON

RF_OUTLET

OFF

RR_INLET

ON

RR_OUTLET

OFF

PMP_MOTOR

ON

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Dynamic Stability Control - MX-5 Miata

5. Confirm that the wheel does not rotate easily while a DSC HU/CM operation click sound is heard.



Performing the inspection above determines the following:



The DSC HU/CM brake lines are normal.



The DSC HU/CM hydraulic system is not significantly abnormal (including DSC HU/CM).



The DSC HU/CM internal electrical parts (solenoid, motor and other parts) are normal.



The DSC unit and DSC HU/CM output system wiring harnesses (solenoid valve, relay
system) are normal.



However, the following items cannot be verified.



Malfunction with intermittent occurrence of the above items



Malfunction of DSC HU/CM input system wiring harnesses and parts



Extremely small leaks in the DSC HU/CM internal hydraulic system

DSC HU/CM REMOVAL/INSTALLATION

1. Perform DSC configuration. (See DSC CONFIGURATION .)

2. Remove in the order indicated in Fig. 5.

3. Install in the reverse order of removal.

4. After installation, perform the combined sensor initialization procedure. (See COMBINED SENSOR

INITIALIZATION PROCEDURE .)

5. After installation, perform the steering angle sensor initialization procedure. (See STEERING ANGLE

SENSOR INITIALIZATION PROCEDURE .)

6. After installation, perform the steering angle signal initialization procedure. (See STEERING ANGLE

SIGNAL INITIALIZATION PROCEDURE .)

CAUTION:



When replacing the DSC HU/CM with a new one, configuration
procedure must be performed before removing the DSC HU/CM. If
configuration is not completed before removing the DSC HU/CM, DTC
B2477 will be detected.



The DSC may not function normally when the DSC HU/CM is
replaced. After installation, always perform the initialization
procedures for the DSC HU/CM, combined sensor and the steering
angle sensor. (See COMBINED SENSOR INITIALIZATION
PROCEDURE .) (See STEERING ANGLE SENSOR INITIALIZATION
PROCEDURE .) (See STEERING ANGLE SIGNAL INITIALIZATION
PROCEDURE .)



The internal parts of the DSC HU/CM could be damaged if dropped.
Be careful not to drop the DSC HU/CM. Replace the DSC HU/CM if it
is subjected to an impact.

2008 Mazda MX-5 Miata Grand Touring

2008 BRAKES Dynamic Stability Control - MX-5 Miata