Subaru Legacy 2004 Service Manual page 3178

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 steering
angle sensor and chassis ground.
Connector & terminal
(B231) No. 4 (+) — Chassis ground (
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 FOR 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.
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.
6 CHECK 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.
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 OTHER DTC DETECTION.
9 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is the voltage 10 — 15 V?
#
):
Is the voltage 10 — 15 V?
#
):
nector?
Is the resistance 0.5 &?
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)-105
Yes
Go to step 4. Go to step 2.
Repair the har- Go to step 3.
ness between
steering angle
sensor and
VDCCM&H/U.
Correct or replace Go to step 7.
the connector.
Go to step 5. Repair ground cir-
cuit in the steering
angle sensor.
Go to step 6. Go to step 8.
Replace the Go to step 9.
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
Replace the Go to step 8.
VDCCM&H/U.
<Ref. to VDC-7,
VDC Control Mod-
ule & 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
No