Subaru LEGACY 2006 Manual page 4236

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
2 CHECK OUTPUT VOLTAGE OF VDCCM&H/
U.
Measure the voltage between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 30 (+) — Chassis ground (–):
3 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
4 CHECK GROUND CIRCUIT OF STEERING
ANGLE SENSOR.
Measure the resistance between steering
angle sensor and chassis ground.
Connector & terminal
(B231) No. 3 — Chassis ground:
5 CHECK STEERING ANGLE SENSOR HAR-
NESS.
1) Disconnect the connector from the
VDCCM&H/U.
2) Measure the resistance between
VDCCM&H/U and steering angel sensor.
Connector & terminal
(B231) No. 1 — (B310) No. 29:
(B231) No. 2 — (B310) No. 13:
6 CHECK GROUND SHORT CIRCUIT OF
STEERING ANGLE SENSOR HARNESS.
Measure the resistance between steering
angle sensor and chassis ground.
Connector & terminal
(B231) No. 1 — Chassis ground:
(B231) No. 2 — Chassis ground:
7 CHECK STEERING ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Erase the memory.
4) Perform the Inspection Mode.
5) Read the DTC.
8 CHECK THE VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Replace the steering angle sensor.
3) Erase the memory.
4) Perform the Inspection Mode.
5) Read the DTC.
9 CHECK STEERING ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Erase the memory.
4) Perform the Inspection Mode.
5) Read the DTC.
10 CHECK OTHER DTC DETECTION.
11 CHECK OTHER DTC DETECTION.
Check
Is the voltage 10 — 15 V?
nector?
Is the resistance less than 0.5
Ω?
Is the resistance less than 0.5
Ω?
Is the resistance more than 1
MΩ?
Is the same DTC displayed?
Is the same DTC displayed?
Is the same DTC displayed?
Is any other DTC displayed?
Is any other DTC displayed?
VDC(diag)-90
Yes No
Repair the har- Go to step 3.
ness between the
steering angle
sensor and
VDCCM&H/U.
Correct or replace Go to step 9.
the connector.
Go to step 5. Repair ground cir-
cuit in the steering
angle sensor.
Go to step 6. Repair the har-
ness between the
steering angle
sensor and
VDCCM&H/U.
Go to step 7. Repair the har-
ness between the
steering angle
sensor and
VDCCM&H/U.
Go to step 8. Go to step 10.
Replace the Go to step 11.
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Go to step 10.
Replace the
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- Temporary poor
nosis according to contact occurs.
DTC.
Perform the diag- Original steering
nosis according to angle sensor mal-
DTC. function