Subaru Outback: Basic Diagnostic Procedure

A: PROCEDURE

CAUTION: Remove foreign matter (dust, water, oil etc.) from the VDCCM&H/U connector during removal and installation.

NOTE:

• To check the harness for open or short circuits, shake problem spot or connector.
• Refer to "Check List for Interview". <Ref. to VDC(diag)-4, Check List for Interview.>

Check List for Interview

A: CHECK

Check the following item about the vehicle's state.

1. STATE OF ABS WARNING LIGHT

2. STATE OF VDC WARNING LIGHT & VDC INDICATOR LIGHT

3. STATE OF VDC OFF INDICATOR LIGHT

4. CONDITIONS UNDER WHICH TROUBLE OCCURS

General Description

A: CAUTION

1. SUPPLEMENTAL RESTRAINT SYSTEM "AIRBAG"

Airbag system wiring harness is routed near the ABS wheel speed sensor and VDCCM&H/U.

CAUTION:

• Do not use electrical test devices on airbag system wiring harnesses or connector circuits.
• Be careful not to damage the airbag system wiring harness when servicing the ABS wheel speed sensor and VDCCM&H/U.

B: INSPECTION

Before performing diagnosis, check the following items which might affect VDC problems.

1. BATTERY

Measure the battery voltage and check electrolyte.

Standard voltage: 12 V or more

Specific gravity: 1.260 or more

2. GROUND

Check the tightening torque of ground (GV) bolt for VDC.

Tightening torque: 13 N*m (1.3 kgf-m, 9.6 ft-lb)

3. BRAKE FLUID

1) Check the brake fluid level.

2) Check the brake fluid for leaks.

4. HYDRAULIC UNIT

Check the hydraulic unit.

• With brake tester <Ref. to VDC-12, CHECKING THE HYDRAULIC UNIT ABS OPERATION WITH THE BRAKE TESTER, INSPECTION, VDC Control Module and Hydraulic Control Unit (VDCCM& H/U).>
• Without brake tester <Ref. to VDC-12, CHECKING THE HYDRAULIC UNIT ABS OPERATION BY PRESSURE GAUGE, INSPECTION, VDC Control Module and Hydraulic Control Unit (VDCCM& H/U).>

5. BRAKE DRAG

Check for brake drag.

6. BRAKE PAD AND ROTOR

Check the brake pad and rotor.

• Front <Ref. to BR-17, INSPECTION, Front Brake Pad.> <Ref. to BR-19, INSPECTION, Front Disc Rotor.>
• Rear <Ref. to BR-31, INSPECTION, Rear Brake Pad.> <Ref. to BR-34, INSPECTION, Rear Disc Rotor.>

7. TIRE

Check the tire specifications, tire wear and air pressure.

<Ref. to WT-2, SPECIFICATION, General Description.>

C: PREPARATION TOOL

1. SPECIAL TOOL

2. GENERAL TOOL

Electrical Component Location

A: LOCATION

1. VDC control module & hydraulic control unit (VDCCM&H/U)
2. Connector
3. VDC OFF switch
4. ABS warning light
5. Brake warning light (EBD warning light)
6. VDC warning light & VDC indicator light
7. VDC OFF indicator light
8. Steering angle sensor
9. Transmission control module (TCM)
10. Data link connector
11. Magnetic encoder
12. ABS wheel speed sensor
13. Engine control module (ECM)
14. Stop light & brake switch

Control Module I/O Signal

A: ELECTRICAL SPECIFICATION

NOTE:

• Terminal numbers in VDCCM&H/U connector are shown in the figure.
• When the connector is removed from VDCCM&H/U, the brake warning light (EBD warning light), ABS warning light, and VDC warning light & VDC indicator light illuminate.

B: WIRING DIAGRAM

1. Battery
2. Ignition switch
3. VDC control module & hydraulic control unit (VDCCM&H/U)
4. VDC control module
5. Valve relay
6. Pressure sensor
7. Yaw rate & G sensor
8. Motor relay
9. Motor
10. Front inlet solenoid valve LH
11. Front outlet solenoid valve LH
12. Front inlet solenoid valve RH
13. Front outlet solenoid valve RH
14. Rear inlet solenoid valve LH
15. Rear outlet solenoid valve LH
16. Rear inlet solenoid valve RH
17. Rear outlet solenoid valve RH
18. Primary cut solenoid valve
19. Primary suction solenoid valve
20. Secondary cut solenoid valve
21. Secondary suction solenoid valve
22. Data link connector
23. VDC OFF switch
24. Combination meter
25. VDC OFF indicator light
26. VDC warning light & VDC indicator light
27. ABS warning light
28. Brake warning light (EBD warning light)
29. Brake fluid level switch
30. Stop light switch
31. Stop light
32. Body integrated unit
33. Engine control module (ECM)
34. Transmission control module (TCM)
35. Parking brake control module
36. Steering angle sensor
37. Clutch stroke sensor (MT model only)
38. Front ABS wheel speed sensor LH
39. Front ABS wheel speed sensor RH
40. Rear ABS wheel speed sensor LH
41. Rear ABS wheel speed sensor RH

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