Subaru 2009 IMPREZA Service Manual page 2547

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK POWER SUPPLY FOR STEERING
ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from steering
angle sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between the steering
angle sensor and chassis ground.
Connector & terminal
(B231) No. 4 (+) — Chassis ground (–):
2 CHECK GROUND CIRCUIT OF STEERING
ANGLE SENSOR.
Measure the resistance between steering angle
sensor and chassis ground.
Connector & terminal
(B231) No. 3 — Chassis ground:
3 CHECK STEERING ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect all connectors.
3) Clear the memory. <Ref. to VDC(diag)-24,
Clear Memory Mode.>
4) Perform the Inspection Mode. <Ref. to
VDC(diag)-23, Inspection Mode.>
5) Read the DTC.
4 CHECK VDCCM&H/U.
1) Turn the ignition switch to OFF.
2) Replace the steering angle sensor. <Ref. to
VDC-18, Steering Angle Sensor.>
3) Clear the memory. <Ref. to VDC(diag)-24,
Clear Memory Mode.>
4) Perform the Inspection Mode. <Ref. to
VDC(diag)-23, Inspection Mode.>
5) Read the DTC.
5 CHECK OTHER DTC DETECTION.
6 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is the voltage 10 — 15 V?
Is the resistance less than 0.5 ? Go to step 3.
Is the same DTC displayed?
Is the same DTC displayed?
Is any other DTC displayed?
Is any other DTC displayed?
VDC(diag)-85
Yes No
Go to step 2. Repair the steering
angle sensor
power supply cir-
cuit.
Repair ground cir-
cuit in the steering
angle sensor.
Go to step 4. Go to step 5.
Replace the Go to step 6.
VDCCM only.
<Ref. to VDC-9,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- Temporary poor
nosis according to contact occurs.
DTC. <Ref. to
VDC(diag)-33, List
of Diagnostic Trou-
ble Code (DTC).>
Perform the diag- Original steering
nosis according to angle sensor mal-
DTC. <Ref. to function
VDC(diag)-33, List
of Diagnostic Trou-
ble Code (DTC).>