VEHICLE DYNAMICS CONTROL (VDC)
VDC

VEHICLE DYNAMICS CONTROL (VDC) > General Description
SPECIFICATION

Item | Specification or identification
ABS wheel speed sensor | ABS wheel speed sensor gap (for reference) | Front | 0.63 — 1.57 mm (0.02 — 0.06in)
Rear | 0.6 — 1.59 mm (0.02 — 0.06in)
Identifications of harness (symbol) | Front | RH | K3
LH | K4
Rear | RH | K7
LH | K8
VDCCM&H/U identification | Models without EyeSight | F5
Models with EyeSight | F6

VEHICLE DYNAMICS CONTROL (VDC) > General Description
COMPONENT
1. ABS WHEEL SPEED SENSOR

(1) | Sensor sub ASSY front | (4) | Rear axle housing | Tightening torque: N·m (kgf-m, ft-lb)
(2) | Sensor sub ASSY rear | (5) | Magnetic encoder | T: | 7.5 (0.8, 5.5)
(3) | Front axle housing | (6) | Hub unit bearing |  |

2. STEERING ANGLE SENSOR

(1) | Steering roll connector | (2) | Sensor ASSY VDC steering |  |

3. VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U)

(1) | Hydraulic unit ASSY VDC | (7) | Secondary inlet | Tightening torque: N·m (kgf-m, ft-lb)
(2) | Rear RH outlet | (8) | Bracket hydraulic unit adapter | T1: | 7.5 (0.8, 5.5)
(3) | Front LH outlet | (9) | Damper B | T2: | 15 (1.5, 11.1)
(4) | Front RH outlet | (10) | Damper spacer | T3: | 19 (1.9, 14.0)
(5) | Rear LH outlet | (11) | Bracket COMPL hydraulic unit VDC | T4: | 27 (2.8, 19.9)
(6) | Primary inlet | (12) | Damper A | T5: | 33 (3.4, 24.3)

VEHICLE DYNAMICS CONTROL (VDC) > General Description
CAUTION

- When performing service operation, refer to “Repair Contents” in “General Description”. REPAIR CONTENTS>Repair Contents

- When performing any work, always wear work clothes, a work cap and protective shoes. Additionally, wear a helmet, protective goggles, etc. if necessary.

- Remove contamination including dirt and corrosion before removal, installation, disassembly or assembly.

- Keep the disassembled parts in order and protect them from dust and dirt.

- When performing a repair, identify the cause of trouble and avoid unnecessary removal, disassembly and replacement.

- Some vehicle components are extremely hot immediately after driving. Be wary of receiving burns from heated parts.

- Be sure to tighten fasteners including bolts and nuts to the specified torque.

- Always use the jack-up point when the shop jacks or rigid racks are used to support the vehicle.

- If the hydraulic unit assembly VDC, bracket COMPL hydraulic unit VDC, steering wheel and the sensor assembly VDC steering (steering roll connector) are removed, installed or replaced, perform “VSC(VDC) Centering Mode” of the VDC. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE

VEHICLE DYNAMICS CONTROL (VDC) > General Description
PREPARATION TOOL
1. SPECIAL TOOL

ILLUSTRATION | TOOL NUMBER | DESCRIPTION | REMARKS
| — | SUBARU SELECT MONITOR 4 | Used for setting of each function and troubleshooting for electrical system. For detailed operation procedures of Subaru Select Monitor 4, refer to “Help” of application.

2. GENERAL TOOL

TOOL NAME | REMARKS
Oscilloscope | Used for measuring the sensor.
Circuit tester | Used for measuring resistance, voltage and current.
Steering wheel puller | Used for removing the steering wheel.
Flare nut wrench | Used for removing and installing the brake pipe.
Pressure gauge | Used for measuring oil pressure.
DST-i | Used together with Subaru Select Monitor 4.

VEHICLE DYNAMICS CONTROL (VDC) > Relay and Fuse
LOCATION

Main fuse box (M/B) | Fuse 30 A (VDC CM&H/U) | (A)
Fuse 40 A (VDC CM&H/U) | (B)
Fuse & relay box (F/B) | Fuse 7.5 A (VDC CM&H/U) | (C)
Relay holder (R/H) | Brake light relay | (D)

For other related fuses, refer to the wiring diagram. WIRING SYSTEM>Power Supply Circuit

VEHICLE DYNAMICS CONTROL (VDC) > Relay and Fuse
INSPECTION
1. CHECK FUSE
1.

Remove the fuse and inspect visually.

2.

If the fuse is blown out, replace the fuse.

2. CHECK RELAY
1.

Measure the resistance between relay terminals.

Terminal No. | Inspection conditions | Standard | Circuit
10 — 9 | Always | 1 MΩ or more |
10 — 7 | Always | Less than 1 Ω
10 — 9 | Apply battery voltage between terminals 6 and 8. | Less than 1 Ω

2.

Replace the relay if the inspection result is not within the standard value.

VEHICLE DYNAMICS CONTROL (VDC) > Vehicle Dynamics Control System
WIRING DIAGRAM

Refer to “Vehicle Dynamics Control” in the wiring diagram. WIRING SYSTEM>Vehicle Dynamics Control System>WIRING DIAGRAM

VEHICLE DYNAMICS CONTROL (VDC) > Vehicle Dynamics Control System
ELECTRICAL SPECIFICATION

For the electrical specification, refer to “Control Module I/O Signal” of “BRAKE CONTROL (DIAGNOSTICS)” section. BRAKE CONTROL (DIAGNOSTICS)>Control Module I/O Signal

VEHICLE DYNAMICS CONTROL (VDC) > Vehicle Dynamics Control System
INSPECTION
1. BASIC INSPECTION

For the basic inspection, refer to “Basic Diagnostic Procedure” of “BRAKE CONTROL (DIAGNOSTICS)” section. BRAKE CONTROL (DIAGNOSTICS)>Basic Diagnostic Procedure

2. SYSTEM BLOCK DIAGRAM

For system block diagram, refer to “System Block Diagram” in “BRAKE CONTROL (DIAGNOSTICS)”. BRAKE CONTROL (DIAGNOSTICS)>General Description>SYSTEM BLOCK DIAGRAM

3. MODULE I/O SIGNAL

For the electrical specification, refer to “Control Module I/O Signal” of “BRAKE CONTROL (DIAGNOSTICS)” section. BRAKE CONTROL (DIAGNOSTICS)>Control Module I/O Signal>ELECTRICAL SPECIFICATION

VEHICLE DYNAMICS CONTROL (VDC) > Vehicle Dynamics Control System
NOTE

For operation procedures of each component of the vehicle dynamics control system, refer to the respective section.

- Hydraulic unit assembly VDC: VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

- Yaw rate & G sensor: VEHICLE DYNAMICS CONTROL (VDC)>Yaw Rate and G Sensor

- Sensor assembly VDC steering: VEHICLE DYNAMICS CONTROL (VDC)>Steering Angle Sensor

- Sensor sub assembly front: VEHICLE DYNAMICS CONTROL (VDC)>Front ABS Wheel Speed Sensor

- Sensor sub assembly rear: VEHICLE DYNAMICS CONTROL (VDC)>Rear ABS Wheel Speed Sensor

- Front magnetic encoder: VEHICLE DYNAMICS CONTROL (VDC)>Front Magnetic Encoder

- Rear magnetic encoder: VEHICLE DYNAMICS CONTROL (VDC)>Rear Magnetic Encoder

- VDC OFF switch: VEHICLE DYNAMICS CONTROL (VDC)>VDC OFF Switch

- AVH switch: VEHICLE DYNAMICS CONTROL (VDC)>Auto Vehicle Hold Switch

VEHICLE DYNAMICS CONTROL (VDC) > VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)
REMOVAL

- Avoid unnecessary removal of parts in order to prevent fluid leakage.

- When the hydraulic unit assembly VDC components are removed, be sure to perform the installation according to the installation procedures. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>INSTALLATION

1.

Disconnect the ground terminal from battery sensor. REPAIR CONTENTS>NOTE > BATTERY

2.

Remove the air intake boot. INTAKE (INDUCTION)(H4DO)>Air Intake Boot>REMOVAL

3.

Remove the hydraulic unit assembly VDC.

- Do not pull on the harness when disconnecting the connector.

- Wrap the brake pipe with a vinyl bag so as not to spill the brake fluid on the painted surface of the vehicle body.

- If brake fluid is spilled on the painted surface of the vehicle body, wash it off immediately with water and wipe clean.

(1)

Remove dirt from around the hydraulic unit assembly VDC.

(2)

Pull up the lock lever (b) while pressing the lock button (a) to disconnect the hydraulic unit assembly VDC connector.

(3)

Separate each brake pipe using a flare nut wrench.

Preparation tool:

Flare nut wrench

(4)

Remove the bolts and nuts, and then remove the following parts.

- Bracket COMPL hydraulic unit VDC

- Bracket hydraulic unit adapter

- Hydraulic unit assembly VDC

VEHICLE DYNAMICS CONTROL (VDC) > VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)
INSTALLATION

- When installing the hydraulic unit assembly VDC to the bracket COMPL hydraulic unit VDC, make sure that there is no oil adhered to the bolts and the threads of hydraulic unit assembly VDC. If the oil is adhered, degrease it carefully before tightening.

- Connect the hydraulic unit assembly VDC connector securely.

1.

Install the bracket COMPL hydraulic unit VDC and the hydraulic unit assembly VDC.

(1)

Attach the bracket COMPL hydraulic unit VDC.

Tightening torque:

33 N·m (3.4kgf-m, 23.8ft-lb)

(2)

Install the bracket hydraulic unit adapter to the hydraulic unit assembly VDC.

Tightening torque:

27 N·m (2.8kgf-m, 19.9ft-lb)

(3)

Install the hydraulic unit to the bracket COMPL hydraulic unit VDC.

Tightening torque:

7.5N·m (0.8kgf-m, 5.5ft-lb)

(4)

Connect the hydraulic unit assembly VDC connector.

(5)

Install each brake pipe using a flare nut wrench.

Preparation tool:

Flare nut wrench

Tightening torque:

Refer to “COMPONENT” of “General Description” for the tightening torque. BRAKE>General Description>COMPONENT > FRONT BRAKE PIPES AND HOSES

2.

Install the air intake boot. INTAKE (INDUCTION)(H4DO)>Air Intake Boot>INSTALLATION

3.

Connect the ground terminal to battery sensor. REPAIR CONTENTS>NOTE > BATTERY

4.

Bleed air from the brake system. BRAKE>Air Bleeding>PROCEDURE

5.

Perform parameter confirmation, selection, and registration.

- When the hydraulic unit assembly VDC is replaced with a new part, be sure to perform the parameter selection • registration operation.

- When the registration has not been performed, the DTC code [Parameter selection error] is detected together with the ABS/EBD/VDC warning light illumination.

(1)

Check that the applied model and grade of the relevant vehicle are included. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER CHECK

(2)

If the applied model and grade of the target vehicle are not included, perform parameter selection and registration. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER CHECK

6.

Perform “VDC sensor midpoint setting mode”. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE

VEHICLE DYNAMICS CONTROL (VDC) > VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)
INSPECTION
1.

Check the identification (a) of the hydraulic unit assembly VDC.

For the identification, refer to “SPECIFICATION” in “General Description”. VEHICLE DYNAMICS CONTROL (VDC)>General Description>SPECIFICATION

2.

Check the condition of connection and settlement of connector, and correct or replace if defective.

1. CHECKING THE HYDRAULIC UNIT ABS OPERATION BY PRESSURE GAUGE
1.

Lift up the vehicle, and then remove the wheel.

2.

Remove the bleeder screws from the front LH and front RH caliper bodies.

3.

Connect two pressure gauges to front LH and front RH caliper bodies.

- Use a pressure gauge used exclusively for brake fluid measurement.

- Do not use the pressure gauge used for the measurement of transmission oil. Doing so will cause the piston seal to expand and deform.

Wrap sealing tape around the pressure gauge.

4.

Bleed air from the pressure gauges and the front LH and front RH caliper bodies.

5.

Perform ABS sequence control. VEHICLE DYNAMICS CONTROL (VDC)>ABS Sequence Control

When the hydraulic unit begins to work, first the front LH side performs decompression, hold and compression, and then the front RH side performs decompression, hold and compression.

6.

Read values indicated on the pressure gauge and check if the fluctuation of the values between decompression and compression meets the standard values. Depress the brake pedal and check that the kick-back is normal, and tightness is normal.

Inspection conditions | Front wheel | Rear wheel
Initial value | 3,500 kPa (36 kgf/cm2, 511 psi) | 3,500 kPa (36 kgf/cm2, 511 psi)
When depressurized | 500 kPa (5 kgf/cm2, 73 psi) or less | 500 kPa (5 kgf/cm2, 73 psi) or less
When pressurized | 3,500 kPa (36 kgf/cm2, 511 psi) or more | 3,500 kPa (36 kgf/cm2, 511 psi) or more

7.

Remove the pressure gauge from the front LH and front RH caliper bodies.

8.

Install the bleeder screws of the front LH and front RH caliper bodies.

9.

Remove the bleeder screws from the rear LH and rear RH caliper bodies.

10.

Connect two pressure gauges to rear LH and rear RH caliper bodies.

11.

Bleed air from the pressure gauges and the rear LH and rear RH caliper bodies.

12.

Perform ABS sequence control. VEHICLE DYNAMICS CONTROL (VDC)>ABS Sequence Control

When the hydraulic unit begins to work, first the rear LH side performs decompression, hold and compression, and then the rear RH side performs decompression, hold and compression.

13.

Read values indicated on the pressure gauge and check if the fluctuation of the values between decompression and compression meets specification. Depress the brake pedal and check that the kick-back is normal, and tightness is normal.

14.

Remove the pressure gauge from the rear LH and rear RH caliper bodies.

15.

Install the bleeder screws of the rear LH and rear RH caliper bodies.

16.

Bleed air from the brake system. BRAKE>Air Bleeding

2. CHECKING THE HYDRAULIC UNIT VDC OPERATION USING A PRESSURE GAUGE
1.

Lift up the vehicle, and then remove the wheel.

2.

Remove the bleeder screws from the front LH and front RH caliper bodies.

3.

Connect two pressure gauges to front LH and front RH caliper bodies.

- Use a pressure gauge used exclusively for brake fluid measurement.

- Do not use a pressure gauge used for the measuring transmission oil pressure, as the piston seal may expand and deform.

Wrap sealing tape around the pressure gauge.

4.

Bleed air from the pressure gauge.

5.

Perform VDC sequence control. VEHICLE DYNAMICS CONTROL (VDC)>VDC Sequence Control

When the hydraulic unit begins to work, first the front LH side performs compression, hold and decompression, and then the front RH side performs compression, hold and decompression.

6.

Read values indicated on the pressure gauge and check if the fluctuation of the values between decompression and compression meets specification. Depress the brake pedal and check that it is not abnormally hard, and tightness is normal.

Inspection conditions | Front wheel | Rear wheel
When pressurized | 3,000 kPa (31 kgf/cm2, 441 psi) or more | 3,000 kPa (31 kgf/cm2, 441 psi) or more
When depressurized | 500 kPa (5 kgf/cm2, 73 psi) or less | 500 kPa (5 kgf/cm2, 73 psi) or less

7.

Remove the pressure gauge from the front LH and front RH caliper bodies.

8.

Install the bleeder screws of the front LH and front RH caliper bodies.

9.

Remove the bleeder screws from the rear LH and rear RH caliper bodies.

10.

Connect two pressure gauges to rear LH and rear RH caliper bodies.

11.

Bleed air from the pressure gauges and the rear LH and rear RH caliper bodies.

12.

Perform VDC sequence control. VEHICLE DYNAMICS CONTROL (VDC)>VDC Sequence Control

When the hydraulic unit begins to work, first the rear RH side performs compression, hold and decompression, and then the rear LH side performs compression, hold and decompression.

13.

Read the values indicated on the pressure gauges and check if it is within specification. Depress the brake pedal and check that it is not abnormally hard, and tightness is normal.

14.

Remove the pressure gauge from the rear LH and rear RH caliper bodies.

15.

Install the bleeder screws of the rear LH and rear RH caliper bodies.

16.

Bleed air from the brake system. BRAKE>Air Bleeding

VEHICLE DYNAMICS CONTROL (VDC) > VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)
ADJUSTMENT
1. VDC SENSOR MIDPOINT SETTING MODE

After installing, replacing or adjusting the following parts, perform the VDC sensor midpoint setting mode.

- Sensor assembly VDC steering

- Steering wheel

- Suspension parts

- Wheel alignment

- Hydraulic unit assembly VDC

- Bracket COMPL hydraulic unit VDC

1.

Park the vehicle on a level surface, and set the steering wheel to the neutral position.

2.

Using Subaru Select Monitor, select [Steering Angle Sensor], [Longitudinal G Sensor] and [Abnormal Lateral G Sensor output] from the list of Data Monitor items. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

(1)

Check the steer angle sensor output value.

Specification:

- Within range of −10 — 10 deg: Perform the VDC sensor 0 point setting mode.

- Out of range of −10 — 10 deg: Check the steering wheel neutral position

(2)

Check the output values for the longitudinal G sensor and lateral G sensor.

Specification:

- Within range of −2 — 2 m/s2: Perform the VDC sensor 0 point setting mode.

- Out of range of −2 — 2 m/s2: Check the installing condition of the VDC CM&H/U and VDC CM&H/U bracket.

3.

Perform the VDC sensor 0 point setting mode.

From the work support item list, select [VSC(VDC) Centering Mode], and perform the setting according to the procedure displayed on the Subaru Select Monitor screen. BRAKE CONTROL (DIAGNOSTICS)>Work Support

4.

Drive the vehicle for 10 minutes, and check that there is no system malfunction or the warning light illumination while driving.

5.

Make sure that the DTC is not stored.

VEHICLE DYNAMICS CONTROL (VDC) > VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)
MAINTENANCE MODE
1. VDCCM PARAMETER READING
1.

Perform reading of parameter.

(1)

Connect the Subaru Select Monitor.

(2)

Turn the ignition switch to ON.

(3)

On [Start] screen, select [Diagnosis].

(4)

On [Select Vehicle] screen, input the target vehicle information and select [Set].

(5)

On [Main Menu] screen, select [Each System].

(6)

On [Select System] screen, select [Brake Control], and then select [Enter].

(7)

On [Select Function] screen, select [Work Support].

(8)

On [Work Support] screen, select [Reading of parameter: ECM to SSM].

2.

Save and close the file.

2. VDCCM PARAMETER WRITING
1.

Perform writing of parameter.

(1)

Connect the Subaru Select Monitor.

(2)

Turn the ignition switch to ON.

(3)

On [Start] screen, select [Diagnosis].

(4)

On [Select Vehicle] screen, input the target vehicle information and select [Set].

(5)

On [Main Menu] screen, select [Each System].

(6)

On [Select System] screen, select [Brake Control], and then select [Enter].

(7)

On [Select Function] screen, select [Work Support].

(8)

On [Work Support] screen, select [Writing of parameter: SSM to ECM].

2.

Open the file saved in the [Reading of parameter: ECM to SSM].

3.

When the confirmation screen indicating the vehicle information appears, check that the correct applied model and grade are displayed and click the [OK] button.

3. VDCCM PARAMETER SELECTION

- When the hydraulic unit assembly VDC is replaced with a replacement part, be sure to perform the parameter selection/registration to the hydraulic unit assembly VDC using this function.

- To check the applied model, refer to the “Model number plate” attached to the vehicle. IDENTIFICATION

- If you entered a wrong applied model, you can re-write it.

- When the registration has not been performed, the DTC code “Parameter” is detected together with the ABS/EBD/VDC warning light illumination.

- This function can be used for replacement parts of the hydraulic unit assembly VDC.

1.

Perform selection of parameter.

(1)

Connect the Subaru Select Monitor.

(2)

Turn the ignition switch to ON.

(3)

On [Start] screen, select [Diagnosis].

(4)

On [Select Vehicle] screen, input the target vehicle information and select [Set].

(5)

On [Main Menu] screen, select [Each System].

(6)

On [Select System] screen, select [Brake Control], and then select [Enter].

(7)

On [Select Function] screen, select [Work Support].

(8)

On [Work Support] screen, select [Selection of Parameter].

2.

Check the applied model and option code indicated on the “Model number plate”. IDENTIFICATION

3.

Enter the applied model (alphanumeric characters) and click the [OK] button.

4.

When the option code input screen appears after entering the applied model, enter the option code (alphanumeric characters), and click the [OK] button.

5.

When the confirmation screen indicating the vehicle information appears, check that the correct applied model and grade are displayed and click the [OK] button.

When the displayed applied model and grade are different from those of the vehicle, click the [OK] button and then perform the registration operation again.

6.

Execute the Clear Memory Mode after parameter selection and registration operations because the DTC for “Parameter selection error” is memorized. COMMON(diag)>Clear memory

4. VDCCM PARAMETER CHECK

The parameter data registered in the VDCCM is shown on the display.

1.

Perform confirming on parameter.

(1)

Connect the Subaru Select Monitor.

(2)

Turn the ignition switch to ON.

(3)

On [Start] screen, select [Diagnosis].

(4)

On [Select Vehicle] screen, input the target vehicle information and select [Set].

(5)

On [Main Menu] screen, select [Each System].

(6)

On [Select System] screen, select [Brake Control], and then select [Enter].

(7)

On [Select Function] screen, select [Work Support].

(8)

On [Work Support] screen, select [Confirm on parameter].

2.

Check that the applied model and grade of the target vehicle are included, and click the [OK] button.

3.

If the applied model and grade of the target vehicle are not included, perform “parameter selection and registration”. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER CHECK

VEHICLE DYNAMICS CONTROL (VDC) > ABS Sequence Control
OPERATION
1.

While the ABS sequence control is being performed, the operation of the hydraulic unit can be checked using the brake tester or pressure gauge after the hydraulic unit solenoid valve operation.

2.

ABS sequence control can be started by the Subaru Select Monitor.

1. ABS SEQUENCE CONTROL WITH SUBARU SELECT MONITOR

In the event of any trouble, the ABS sequence control will not operate.

1.

Connect the Subaru Select Monitor.

(1)

Turn the ignition switch to ON.

(2)

On [Start] screen, select [Diagnosis].

(3)

On [Select Vehicle] screen, input the target vehicle information and select [Set].

(4)

On [Main Menu] screen, select [Each System].

(5)

On [Select System] screen, select [Brake Control], and then select [Enter].

(6)

On [Select Function] screen, select [Work Support].

(7)

On the work support item list, select [ABS Sequence Control Mode].

2.

Follow the procedures displayed in the Subaru Select Monitor to execute the following.

(1)

When using a brake tester, depress the brake pedal with a force of 100 N (10.2 kgf, 22.5 lbf).

(2)

When using a pressure gauge, press the brake pedal so that the pressure gauge indicates 3,500 kPa (36 kgf/cm2, 511 psi).

3.

The brake system being operated is displayed on the Subaru Select Monitor.

2. CONDITIONS FOR ABS SEQUENCE CONTROL
VEHICLE DYNAMICS CONTROL (VDC) > ABS Sequence Control
SPECIFICATION
1. CONDITIONS FOR COMPLETION OF ABS SEQUENCE CONTROL

When the following conditions develop, the ABS sequence control stops and ABS operation is returned to the normal control mode.

- When the speed of at least one wheel reaches 10 km/h (6 MPH).

- When the brake pedal is released during ABS sequence control and the stop light switch is becomes OFF.

- After completion of ABS sequence control.

- When a malfunction is detected.

VEHICLE DYNAMICS CONTROL (VDC) > VDC Sequence Control
OPERATION
1.

While the VDC sequence control is performed, the operation of the hydraulic unit can be checked using the brake tester or pressure gauge after the hydraulic unit solenoid valve is operated.

2.

VDC sequence control can be started by Subaru Select Monitor.

1. VDC SEQUENCE CONTROL WITH SUBARU SELECT MONITOR

In the event of any trouble, sequence control will not operate.

1.

Connect the Subaru Select Monitor.

(1)

Turn the ignition switch to ON.

(2)

On [Start] screen, select [Diagnosis].

(3)

On [Select Vehicle] screen, input the target vehicle information and select [OK].

(4)

On [Main Menu] screen, select [Each System].

(5)

On [Select System] screen, select [Brake Control], and then select [Enter].

(6)

On [Select Function] screen, select [Work Support].

(7)

On the work support item list, select [VDC Check Mode].

2.

Operate according to the procedures displayed in the Subaru Select Monitor.

3.

The brake system being operated is displayed on the Subaru Select Monitor.

2. CONDITIONS FOR VDC SEQUENCE CONTROL
VEHICLE DYNAMICS CONTROL (VDC) > VDC Sequence Control
SPECIFICATION
1. CONDITIONS FOR COMPLETION OF VDC SEQUENCE CONTROL

When the following conditions develop, the VDC sequence control stops and VDC operation is returned to the normal control mode.

- When the speed of at least one wheel reaches 10 km/h (6 MPH).

- After completion of VDC sequence control.

- When a malfunction is detected.

VEHICLE DYNAMICS CONTROL (VDC) > Brake Lamp Relay
NOTE

For brake light relay, refer to “Relay and Fuse”. VEHICLE DYNAMICS CONTROL (VDC)>Relay and Fuse

VEHICLE DYNAMICS CONTROL (VDC) > Brake Lamp Relay
OPERATION
1. BRAKE LIGHT LIGHTING OPERATION BY SUBARU SELECT MONITOR

Performing brake light relay compulsory operation may cause the EyeSight warning light to illuminate. If the brake light relay compulsory operation is performed, refer to “Basic Diagnostic Procedure” of “EyeSight (DIAGNOSTICS)” and check DTCs and then clear memory. EyeSight (DIAGNOSTICS)>Basic Diagnostic Procedure

1.

Connect the Subaru Select Monitor.

In the event of any trouble, brake light lighting operation will not function.

(1)

On [Start] screen, select [Diagnosis].

(2)

On [Select Vehicle] screen, input the target vehicle information and select [Set].

(3)

On [Main Menu] screen, select [Each System].

(4)

On [Select System] screen, select [Brake Control], and then select [Enter].

(5)

On [Select Function] screen, select [Work Support].

(6)

On the work support item list, select [Brake Lamp Lighting Operation].

2.

Operate according to the procedures displayed in the Subaru Select Monitor.

VEHICLE DYNAMICS CONTROL (VDC) > Brake Lamp Relay
SPECIFICATION
1. CONDITIONS TO COMPLETE BRAKE LIGHT LIGHTING OPERATION

When the following conditions develop, the brake light lighting operation stops and the normal control mode is restored.

- When the speed of at least one wheel reaches 10 km/h (6 MPH).

- When brake light lighting operation ends.

- When a malfunction is detected.

VEHICLE DYNAMICS CONTROL (VDC) > Yaw Rate and G Sensor
NOTE

Yaw rate & longitudinal G and lateral G sensor are integrated with the hydraulic unit assembly VDC.

VEHICLE DYNAMICS CONTROL (VDC) > Yaw Rate and G Sensor
INSPECTION
1. YAW RATE & LONGITUDINAL G AND LATERAL G SENSOR SIGNAL
1. CHECK YAW RATE & G SENSOR.
1.

Check the installing condition of the hydraulic unit assembly VDC.

2.

Using Subaru Select Monitor, display [Data monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

3.

Read the output of [Yaw Rate Sensor], [Longitudinal G Sensor] and [Lateral G Sensor].

When the vehicle is placed horizontally, are the displayed values −1.5 — 1.5 m/s2 for longitudinal G and lateral G sensor, and −4 — 4 deg/s for yaw rate sensor?

2

Replace the hydraulic unit assembly VDC.

2. PERFORM DRIVING TEST.

Drive for approximately 10 minutes, and check that there is no system malfunction or the warning light illumination while driving.

Is there any abnormal movement or the warning light illumination while driving?

Perform the diagnosis according to DTCs for the VDC system. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

G sensor is normal.

VEHICLE DYNAMICS CONTROL (VDC) > Steering Angle Sensor
REMOVAL

- If the steering wheel and the sensor assembly VDC steering are removed, perform “VSC(VDC) Centering Mode” of the VDC. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE

- Before handling the airbag system components, always refer to “CAUTION” of “General Description” in “AIRBAG SYSTEM”. AIRBAG SYSTEM>General Description>CAUTION

- Always use the steering wheel puller for removal to avoid deforming the steering wheel.

- If the steering wheel has been removed, make sure that the steering roll connector is not turned from the original position.

1.

Position the front wheels straight ahead.

2.

Disconnect the ground terminal from the battery sensor, and wait for at least 60 seconds before starting work. REPAIR CONTENTS>NOTE > BATTERY

3.

Remove the driver’s airbag module. AIRBAG SYSTEM>Driver’s Airbag Module>REMOVAL

4.

Remove the steering wheel. POWER ASSISTED SYSTEM (POWER STEERING)>Steering Wheel>REMOVAL

5.

Remove the column cover assembly. POWER ASSISTED SYSTEM (POWER STEERING)>Steering Column>REMOVAL

6.

Remove the steering roll connector.

Make sure that the steering roll connector is not turned from the original position.

(1)

Disconnect the connector under the steering roll connector.

(2)

Release the claws and remove the steering roll connector.

7.

Remove the sensor assembly VDC steering.

(1)

Release the claws and remove the sensor assembly VDC steering (b) from the steering roll connector (a).

VEHICLE DYNAMICS CONTROL (VDC) > Steering Angle Sensor
INSTALLATION

- If the hydraulic unit assembly VDC, bracket COMPL hydraulic unit VDC, steering wheel and the sensor assembly VDC steering (steering roll connector) are removed, installed or replaced, perform “VSC(VDC) Centering Mode” of the VDC. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE

- Before handling the airbag system components, always refer to “CAUTION” of “General Description” in “AIRBAG SYSTEM”. AIRBAG SYSTEM>General Description>CAUTION

1.

Install the sensor assembly VDC steering.

(1)

Apply grease to the protrusion (a) of the new sensor assembly VDC steering.

Do not rotate the protrusion of the sensor assembly VDC steering.

(2)

Align the center of steering roll connector. AIRBAG SYSTEM>Roll Connector>INSTALLATION

(3)

Align the position of the protrusion and install the sensor assembly VDC steering to the steering roll connector.

2.

Install the column cover assembly. POWER ASSISTED SYSTEM (POWER STEERING)>Steering Column>INSTALLATION

3.

Install the steering wheel. POWER ASSISTED SYSTEM (POWER STEERING)>Steering Wheel>INSTALLATION

4.

Install the driver’s airbag module. AIRBAG SYSTEM>Driver’s Airbag Module>INSTALLATION

5.

Connect the ground terminal to battery sensor. REPAIR CONTENTS>NOTE > BATTERY

6.

Perform the neutral position setting of the sensor assembly VDC steering. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE

VEHICLE DYNAMICS CONTROL (VDC) > Front ABS Wheel Speed Sensor
REMOVAL
1.

Disconnect the ground terminal from battery sensor. REPAIR CONTENTS>NOTE > BATTERY

2.

Lift up the vehicle, and then remove the front wheels.

3.

Remove the sensor sub assembly front.

- Be careful not to damage the sensor.

- Do not apply excessive force to the sensor harness.

- Leave the sensor harness clamp on the vehicle side.

(1)

Disconnect the connector of the sensor sub assembly front in the engine compartment.

(2)

Remove each harness clip and grommet.

(3)

Remove the sensor sub assembly front from the front axle housing.

VEHICLE DYNAMICS CONTROL (VDC) > Front ABS Wheel Speed Sensor
INSTALLATION

- Be careful not to damage the sensor.

- Do not apply excessive force to the sensor harness.

1.

Install the sensor sub assembly front.

Tightening torque:

7.5N·m (0.8kgf-m, 5.5ft-lb)

2.

Install the front wheels.

Tightening torque:

120 N·m (12.2kgf-m, 88.5ft-lb)

3.

Lower the vehicle.

Check if the harness is not pulled and does not come in contact with the suspension or body while operating the steering.

4.

Connect the ground terminal to battery sensor. REPAIR CONTENTS>NOTE > BATTERY

VEHICLE DYNAMICS CONTROL (VDC) > Front ABS Wheel Speed Sensor
INSPECTION
1. CHECK WITH SUBARU SELECT MONITOR
1.

Connect the Subaru Select Monitor.

(1)

On [Start] screen, select [Diagnosis].

(2)

On [Select Vehicle] screen, input the target vehicle information and select [Set].

(3)

On [Main Menu] screen, select [Each System].

(4)

On [Select System] screen, select [Brake Control], and then select [Enter].

(5)

On [Select Function] screen, select [Data monitor].

(6)

From the data monitor item list, select [FR Wheel Speed] and [FL Wheel Speed].

2.

Check if the speed indicated on the display changes in the same manner as the speedometer reading during acceleration/deceleration when the steering wheel is in the straight-ahead position.

3.

If the inspection result shows that the value for either side alone does not change on the display screen, swap the sensor sub assembly front between LH and RH and then check again to see if the value changes or not.

Using a tape or the like, mark the one on which the value did not change.

- If the inspection result shows that the value does not change on the sensor marked: Replace the relevant sensor sub assembly front.

- If the inspection result shows that the value does not change on the sensor not marked: Place the sensor sub assembly front that is not marked to the original position, and perform unit inspection on the sensor sub assembly front that is marked. VEHICLE DYNAMICS CONTROL (VDC)>Front ABS Wheel Speed Sensor>INSPECTION > CHECK ABS WHEEL SPEED SENSOR UNIT

2. CHECK ABS WHEEL SPEED SENSOR UNIT
1.

Visually check the tip of the sensor sub assembly front for foreign particles or damage. If necessary, clean the tip or replace the sensor sub assembly front.

2.

Disconnect the sensor sub assembly front connector.

3.

Check insulation of the sensor sub assembly front cable. Replace the sensor sub assembly front if faulty.

4.

Connect a 12 V power supply to No. 1 terminal of sensor sub assembly front connector, then attach resistance to the No. 2 terminal. Rotate the wheel at about 3 km/h (2 MPH), and measure the voltage using an oscilloscope.

Standard value of output voltage:

0.7 — 1.4 V

- If the inspection result shows that the output voltage is out of the standard value: Replace the magnetic encoder (front hub unit bearing).

- If the inspection result shows that the output voltage is within standard value: Replace the hydraulic unit assembly VDC.

VEHICLE DYNAMICS CONTROL (VDC) > Rear ABS Wheel Speed Sensor
REMOVAL
1.

Disconnect the ground terminal from battery sensor. REPAIR CONTENTS>NOTE > BATTERY

2.

Lift up the vehicle, and then remove the rear wheels.

3.

Remove the sensor sub assembly rear.

- Be careful not to damage the sensor.

- Do not apply excessive force to the sensor harness.

- Leave the sensor harness clamp on the vehicle side.

(1)

Disconnect the sensor sub assembly rear connector.

(2)

Remove the harness clamp and bolts, and remove the sensor sub assembly rear from the rear axle housing.

VEHICLE DYNAMICS CONTROL (VDC) > Rear ABS Wheel Speed Sensor
INSTALLATION

- Be careful not to damage the sensor.

- Do not apply excessive force to the sensor harness.

1.

Install the sensor sub assembly rear.

Check the identification (mark) on the harness to make sure there is no warpage. VEHICLE DYNAMICS CONTROL (VDC)>General Description>SPECIFICATION

Tightening torque:

7.5N·m (0.8kgf-m, 5.5ft-lb)

2.

Install the rear wheels.

Tightening torque:

120 N·m (12.2kgf-m, 88.5ft-lb)

3.

Lower the vehicle.

4.

Connect the ground terminal to battery sensor. REPAIR CONTENTS>NOTE > BATTERY

VEHICLE DYNAMICS CONTROL (VDC) > Rear ABS Wheel Speed Sensor
INSPECTION
1. CHECK WITH SUBARU SELECT MONITOR
1.

Connect the Subaru Select Monitor.

(1)

On [Start] screen, select [Diagnosis].

(2)

On [Vehicle selection] screen, input the target vehicle information and select [OK].

(3)

On [Main Menu] screen, select [Each System].

(4)

On [Select System] screen, select [Brake Control], and then select [Enter].

(5)

On [Select Function] screen, select [Data monitor].

(6)

From the data monitor item list, select [RR Wheel Speed] and [RL Wheel Speed].

2.

Check if the speed indicated on the display changes in the same manner as the speedometer reading during acceleration/deceleration when the steering wheel is in the straight-ahead position.

3.

If the inspection result shows that the value for either side alone does not change on the display screen, swap the sensor sub assembly rear between LH and RH and then check again to see if the value changes or not.

Using a tape or the like, mark the one on which the value did not change.

- If the inspection result shows that the value does not change on the sensor marked: Replace the relevant sensor sub assembly rear.

- If the inspection result shows that the value does not change on the sensor not marked: Place the sensor sub assembly rear that is not marked to the original position, and perform unit inspection on the sensor sub assembly rear that is marked. VEHICLE DYNAMICS CONTROL (VDC)>Rear ABS Wheel Speed Sensor>INSPECTION > CHECK ABS WHEEL SPEED SENSOR UNIT

2. CHECK ABS WHEEL SPEED SENSOR UNIT
1.

Visually check the tip of the sensor sub assembly rear for foreign particles or damage. If necessary, clean the tip or replace the sensor sub assembly rear.

2.

Disconnect the sensor sub assembly rear connector.

3.

Check insulation of the sensor sub assembly rear cable. Replace the sensor sub assembly rear if faulty.

4.

Connect a 12 V power supply to No. 1 terminal of sensor sub assembly rear connector, then attach resistance to the No. 2 terminal. Rotate the wheel at about 2.75 km/h (2 MPH), and measure the voltage using an oscilloscope.

Standard value of output voltage:

0.7 — 1.4 V

- If the inspection result shows that the output voltage is out of the standard value: Replace the magnetic encoder (rear hub unit bearing).

- If the inspection result shows that the output voltage is within standard value: Replace the hydraulic unit assembly VDC.

VEHICLE DYNAMICS CONTROL (VDC) > Front Magnetic Encoder
NOTE

For the operation procedures of front magnetic encoder, refer to “PROPELLER SHAFT / DRIVE SHAFT / AXLE” section.

- Removal: PROPELLER SHAFT / DRIVE SHAFT / AXLE>Front Hub Unit Bearing>REMOVAL

- Installation: PROPELLER SHAFT / DRIVE SHAFT / AXLE>Front Hub Unit Bearing>INSTALLATION

VEHICLE DYNAMICS CONTROL (VDC) > Front Magnetic Encoder
INSPECTION

Visually check the front magnetic encoder for any damage. If necessary, replace with a new front hub unit bearing.

Because the magnetic encoder is integrated with hub unit bearing, replace the hub unit bearing with a new part if there is any defect found on the magnetic encoder.

VEHICLE DYNAMICS CONTROL (VDC) > Rear Magnetic Encoder
NOTE

For the operation procedures of rear magnetic encoder, refer to “PROPELLER SHAFT / DRIVE SHAFT / AXLE” section.

- Removal: PROPELLER SHAFT / DRIVE SHAFT / AXLE>Rear Hub Unit Bearing>REMOVAL

- Installation: PROPELLER SHAFT / DRIVE SHAFT / AXLE>Rear Hub Unit Bearing>INSTALLATION

VEHICLE DYNAMICS CONTROL (VDC) > Rear Magnetic Encoder
INSPECTION

Visually check the rear magnetic encoder for any damage. If necessary, replace with a new rear hub unit bearing.

Because the magnetic encoder is integrated with hub unit bearing, replace the hub unit bearing with a new part if there is any defect found on the magnetic encoder.

VEHICLE DYNAMICS CONTROL (VDC) > VDC OFF Switch
REMOVAL
1. TYPE A
1.

Disconnect the ground terminal from the battery sensor, and wait for at least 60 seconds before starting work. REPAIR CONTENTS>NOTE > BATTERY

2.

Remove the cover LWR driver. EXTERIOR/INTERIOR TRIM>Instrument Panel Lower Cover>REMOVAL

3.

Release the claws and remove the VDC OFF switch (e).

2. TYPE B

For removal, refer to “CONTINUOUSLY VARIABLE TRANSMISSION” section. CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>X MODE Switch>REMOVAL

VEHICLE DYNAMICS CONTROL (VDC) > VDC OFF Switch
INSTALLATION
1. TYPE A
1.

Install the VDC OFF switch.

2.

Install the cover LWR driver. EXTERIOR/INTERIOR TRIM>Instrument Panel Lower Cover>INSTALLATION

3.

Connect the ground terminal to battery sensor. REPAIR CONTENTS>NOTE > BATTERY

2. TYPE B

For installation, refer to “CONTINUOUSLY VARIABLE TRANSMISSION” section. CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>X MODE Switch>INSTALLATION

VEHICLE DYNAMICS CONTROL (VDC) > VDC OFF Switch
INSPECTION
1. TYPE A
1.

Measure the resistance between the VDC OFF switch terminals.

Preparation tool:

Circuit tester

Terminals No. | Inspection conditions | Standard
6 — 8 | Switch OFF | 1 MΩ or more
Switch ON | Less than 1 Ω

2.

Apply battery voltage between the connector terminals to check lighting condition of illumination inside the switch.

When applying battery voltage, do not mix up the positive (+) side and the negative (−) side.

Incorrect polarity connection may cause LED damage inside the switch.

Terminal No. | Inspection conditions | Specification
1 (+) — 4 (−) | Apply battery voltage. | Light ON

3.

Replace the VDC OFF switch if the inspection result is not within the standard value.

2. TYPE B
1.

Measure the resistance between X mode switch terminals.

Preparation tool:

Circuit tester

Terminals No. | Inspection conditions | Standard
1 — 4 | Always | 1 MΩ or more
1 — 4 | Counterclockwise (hold) | 0Ω

2.

Apply battery voltage between the connector terminals to check lighting condition of illumination inside the switch.

When applying battery voltage, do not mix up the positive (+) side and the negative (−) side.

Incorrect polarity connection may cause LED damage inside the switch.

Terminal No. | Inspection conditions | Specification
2 (+) — 3 (−) | Apply battery voltage. | Light ON

3.

If the result of the inspection is not within the standard value, replace the X mode switch.

VEHICLE DYNAMICS CONTROL (VDC) > Auto Vehicle Hold Switch
NOTE

For the operation procedures for AVH switch, refer to “PARKING BRAKE” section.

- Removal: PARKING BRAKE>Parking Brake Switch>REMOVAL

- Installation: PARKING BRAKE>Parking Brake Switch>INSTALLATION

VEHICLE DYNAMICS CONTROL (VDC) > Auto Vehicle Hold Switch
INSPECTION
1.

Measure the resistance between AVH switch terminals.

Preparation tool:

Circuit tester

Terminal No. | Inspection conditions | Standard
3 — 8 | Switch OFF | 1 MΩ or more
Switch ON | Less than 1 Ω

2.

Apply battery voltage between the connector terminals to check lighting condition of illumination inside the switch.

When applying battery voltage, do not mix up the positive (+) side and the negative (−) side.

Incorrect polarity connection may cause LED damage inside the switch.

Terminal No. | Inspection conditions | Specification
7 (+) — 9 (−) | Apply battery voltage. | Light ON

3.

Replace the switch assembly EPB if the inspection result is not within the standard value.

VEHICLE DYNAMICS CONTROL (VDC) > General Diagnostic Table
INSPECTION

For general diagnostic table, refer to “General Diagnostic Table” of “BRAKE CONTROL (DIAGNOSTICS)” section. BRAKE CONTROL (DIAGNOSTICS)>General Diagnostic Table>INSPECTION