2008 - MX-5 - Brakes

DSC SYSTEM INSPECTION

Preparation

1. Verify that battery is fully charged.

2. Turn the ignition switch to the ON position, and verify that the ABS warning light goes out after approx. 3 s.

3. Turn the ignition switch off.

4. Jack up the vehicle and support it evenly on safety stands.

5. Shift to the N position.

6. Verify that all four wheels rotate.

7. Rotate the inspected wheels by hand, and verify there is no brake drag.

• If there is any brake drag, perform regular brake inspection.

• If there is no brake drag, perform DSC HU/CM operation inspection.

ABS 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. Brake pressure retention

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	OFF
LR_INLET			ON
LR_OUTLET			OFF
RF_INLET		ON
RF_OUTLET		OFF
RR_INLET				ON
RR_OUTLET				OFF
PMP_MOTOR

Brake pressure reduction

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.

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 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.

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

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

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