Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2002LEGACY L SEDAN AWD F4-2.5L SOHCREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - BRAKES AND TRACTION CONTROLELECTRONIC BRAKE CONTROL MODULETESTING AND INSPECTIONVEHICLE DYNAMICS CONTROL (VDC)
2002 Subaru Legacy L Sedan AWD F4-2.5L SOHC
Vehicle Dynamics Control (VDC)
2002 Subaru Legacy L Sedan AWD F4-2.5L SOHCSECTION Vehicle Dynamics Control (VDC)
INSPECTION
Check the VDCCM identification mark.
ADJUSTMENT
Always conduct steering angle sensor center positioning and yaw rate and lateral G sensor 0 positioning whenever you have replaced, removed or installed the following items.
^ VDCCM
^ Steering angle sensor
^ Yaw rate and lateral G sensor
^ Steering wheel parts (including airbag)
^ Suspension parts
^ Adjustment of wheel alignment
1. WITHOUT SUBARU SELECT MONITOR
1. Park the vehicle in a straight ahead position on a horizontal surface.
2. Confirm the steering wheel center position. (If the center position is not accurate, adjust wheel alignment.)
3. Drive the vehicle approx. 10 km (6 MPH) preferably on a straight road, then turn ignition switch OFF. Then drive the vehicle approx. 10 km (6 MPH) again confirming that ABS and VDC warning lights do not go ON while vehicle is being driven. Also make sure there are no abnormalities of the VDC function or steering operation.
NOTE: If it is not possible to drive the vehicle, use SUBARU SELECT MONITOR.
4. If there are any abnormalities found, conduct the procedure over again.
2. WITH SUBARU SELECT MONITOR
1. Park the vehicle in a straight ahead position on a horizontal surface. (Engine running in gear position of P or N)
2. Confirm the steering wheel center position. (If the center position is not accurate, adjust wheel alignment.)
3. Set the SUBARU SELECT MONITOR on the vehicle and select "Set Mode Str.A.Sen.N & Lat.Gsen.Op" in "Function Check Sequence" display menu. (Follow the instructions in the display.)
4. Select "Current Data display & Save" in {Brake Control System} display menu and confirm if the steering angle sensor is indicated as "0 deg".
5. If the display does not indicate {0 deg}, conduct the procedure over again and make sure it indicates "0 deg".
6. Drive the vehicle approx. 10 minutes and confirm that ABS and VDC warning lights do not go ON while vehicle is being driven.
7. If there are any abnormalities in VDC function or steering operation found while vehicle is being driven, conduct the procedure over again.
Check the VDCCM identification mark.
ADJUSTMENT
Always conduct steering angle sensor center positioning and yaw rate and lateral G sensor 0 positioning whenever you have replaced, removed or installed the following items.
^ VDCCM
^ Steering angle sensor
^ Yaw rate and lateral G sensor
^ Steering wheel parts (including airbag)
^ Suspension parts
^ Adjustment of wheel alignment
1. WITHOUT SUBARU SELECT MONITOR
1. Park the vehicle in a straight ahead position on a horizontal surface.
2. Confirm the steering wheel center position. (If the center position is not accurate, adjust wheel alignment.)
3. Drive the vehicle approx. 10 km (6 MPH) preferably on a straight road, then turn ignition switch OFF. Then drive the vehicle approx. 10 km (6 MPH) again confirming that ABS and VDC warning lights do not go ON while vehicle is being driven. Also make sure there are no abnormalities of the VDC function or steering operation.
NOTE: If it is not possible to drive the vehicle, use SUBARU SELECT MONITOR.
4. If there are any abnormalities found, conduct the procedure over again.
2. WITH SUBARU SELECT MONITOR
1. Park the vehicle in a straight ahead position on a horizontal surface. (Engine running in gear position of P or N)
2. Confirm the steering wheel center position. (If the center position is not accurate, adjust wheel alignment.)
3. Set the SUBARU SELECT MONITOR on the vehicle and select "Set Mode Str.A.Sen.N & Lat.Gsen.Op" in "Function Check Sequence" display menu. (Follow the instructions in the display.)
4. Select "Current Data display & Save" in {Brake Control System} display menu and confirm if the steering angle sensor is indicated as "0 deg".
5. If the display does not indicate {0 deg}, conduct the procedure over again and make sure it indicates "0 deg".
6. Drive the vehicle approx. 10 minutes and confirm that ABS and VDC warning lights do not go ON while vehicle is being driven.
7. If there are any abnormalities in VDC function or steering operation found while vehicle is being driven, conduct the procedure over again.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.