DSC SYSTEM INSPECTION

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Preparation

1.  Verify that the battery is fully charged.

2.  Turn the ignition switch to the ON position and verify that the ABS warning light goes out after approx. 3.0 s.

3.  Turn the ignition switch to the LOCK position.

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.

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3.  Set up an active command mode inspection according to the combination of commands below. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

Brake pressure retention

Command name

Inspected wheels

LF

RF

LR

RR
PMP_MTR
OFF
V_LF_INL
On
Off
Off
Off
V_LF_OTL
Off
V_LR_INL
On
V_LR_OTL
Off
V_RF_INL
On
V_RF_OTL
Off
V_RR_INL
On
V_RR_OTL
Off
V_STB_L
Off
V_STB_R
V_TRC_L
V_TRC_R

Brake pressure reduction

Command name

Inspected wheels

LF

RF

LR

RR
PMP_MTR
ON
V_LF_INL
On
Off
Off
Off
V_LF_OTL
V_LR_INL
Off
On
V_LR_OTL
V_RF_INL
On
Off
V_RF_OTL
V_RR_INL
Off
On
V_RR_OTL
V_STB_L
Off
V_STB_R
V_TRC_L
V_TRC_R

Caution
•  When operating the solenoid valve and pump motor using the active command mode, make sure to keep the operation time within 2 s to prevent damaging the DSC HU/CM.
Note
•  When working with two people, one should press on the brake pedal, 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.  When brake pressure is maintained and a DSC HU/CM operation click sound is heard, confirm that the wheel does not rotate. When brake pressure is being reduced and a 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 has no significant malfunction (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.
―  Intermittent malfunction of the above items
―  Malfunction of DSC HU/CM input system wiring harnesses and parts
―  Extremely small leakage in the DSC HU/CM internal hydraulic system


DSC Control Inspection

1.  Perform “Preparation”.

2.  Connect the M-MDS to the DLC-2.

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3.  Set up an active command mode inspection according to the combination of commands below. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

Caution
•  When operating the solenoid valve and pump motor using the active command mode, make sure to keep the operation time within 2 s to prevent damaging the DSC HU/CM.

Command name

Inspected wheels

Oversteer control disabled

Understeer control disabled

LF

RF

LR

RR
PMP_MTR
ON
V_LF_INL
Off
Off
Off
On
V_LF_OTL
Off
V_LR_INL
On
V_LR_OTL
Off
V_RF_INL
On
V_RF_OTL
Off
V_RR_INL
On
V_RR_OTL
Off
V_STB_L
On
Off
On
V_STB_R
Off
On
Off
V_TRC_L
On
V_TRC_R

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 has no significant malfunction (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.
―  Intermittent malfunction of the above items
―  Malfunction of DSC HU/CM input system wiring harnesses and parts
―  Extremely small leakage in the DSC HU/CM internal hydraulic system