Electronic Brake Control Module: Service and Repair
VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)REMOVAL
1) Disconnect the ground cable from battery.
2) Remove any dirt from around the VDCCM&H/U.
3) Release the lock (1), pull down the lock lever (2) and disconnect the VDCCM&H/U connector.
CAUTION:
Do not pull on the harness when disconnecting the connector.
4) Disconnect the brake pipes from the VDCCM&H/U.
5) Wrap the brake pipe with a vinyl bag so as not to spill the brake fluid on the vehicle body.
CAUTION:
If brake fluid is spilled on the vehicle body, wash it off immediately with water and wipe clean.
6) Remove the bolt, and then remove the VDCCM&H/U.
CAUTION:
^ Do not drop or bump the VDCCM&H/U.
^ Do not turn the VDCCM&H/U upside down or place it sideways for storage.
^ Be careful not to let foreign matter enter the VDCCM&H/U.
^ Be careful that no water enters the connectors.
INSTALLATION
1) Install in the reverse order of removal.
CAUTION:
When installing the VDCCM&H/U to the bracket, make sure that there is no oil adhered to the threads of VDCCM&H/U. If the oil is adhered, degrease it carefully before tightening.
2) Connect the VDCCM&H/U connector.
3) Lift the lock lever to securely lock the connector.
4) Bleed air from the brake system.
5) Check the parameter to confirm that the applied model and grade of the target vehicle are included.
6) If the applied model and grade of the target vehicle are not included on the (Confirm on parameter) display screen, perform parameter selection and registration.
NOTE:
^ When the VDCCM&H/U has been replaced with a new part, be sure to perform parameter selection and registration.
^ Parameter selection and registration operation requires the Subaru Select Monitor.
^ When no data is registered, ABS/EBD/VDC warning light illuminates and the DTC "Parameter selection error" is detected.
7) Perform "Set up mode for Neutral of Steering Angle Sensor & Lateral G Sensor 0 point".
8) Perform "Longitudinal G sensor & lateral G sensor 0 point setting mode".
ADJUSTMENT
SET UP MODE FOR NEUTRAL OF STEERING ANGLE SENSOR & LATERAL G SENSOR 0 POINT
Perform this mode after installing, replacing or adjusting the following parts.
^ Steering angle sensor
^ Steering wheel
^ Suspension parts
^ Wheel alignment
^ VDCCM&H/U
^ VDCCM&H/U bracket
1) Set the steering wheel to the neutral position.
2) Connect the Subaru Select Monitor.
3) On the [[Main Menu]] display, select (Each System Check).
4) On the [[System Selection Menu]] display, select (Brake Control System).
5) When {VDC} is displayed, select the [OK] button.
6) On the [[Brake Control Diagnosis]] display, select (Current Data Display & Save).
7) Read (Steering angle sensor value).
8) Check that the displayed value is between - 10 and 10 deg.
9) On the [[Function Check Sequence]] display, select (Set up mode for Neutral of Steering Angle Sensor & Lateral G Sensor 0 point).
10) Drive the vehicle for 10 minutes, and check that there is no system malfunction or the warning light illumination while driving.
11) Make sure that the DTC is not stored.
LONGITUDINAL G SENSOR & LATERAL G SENSOR 0 POINT SETTING MODE
Perform this mode after installing or replacing the following parts.
^ Suspension parts
^ VDCCM&H/U
^ VDCCM&H/U bracket
1) Park the vehicle on a level surface with all wheels aligned straight.
2) Connect the Subaru Select Monitor.
3) On the [[Main Menu]] display, select (Each System Check).
4) On the [[System Selection Menu]] display, select (Brake Control System).
5) When {VDC} is displayed, select the [OK] button.
6) On the [[Brake Control Diagnosis]] display, select (Current Data Display & Save).
7) Read (Longitudinal G sensor output) and (Lateral G sensor Output).
8) Check that the displayed value is between - 2 and 2 m/s2.
9) On the [[Function Check Sequence]] display, select (Set up mode for Neutral of Steering Angle Sensor & Lateral G Sensor 0 point).
10) Drive the vehicle for 10 minutes, and check that there is no system malfunction or the warning light illumination while driving.
11) Make sure that the DTC is not stored.