Subaru Legacy 2004 Service Manual page 3174

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 HAR-
NESS.
1) Disconnect the connector from VDCCM&H/
U.
2) Measure the resistance between
VDCCM&H/U and steering angle 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 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.
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 resistance 0.5 &?
Is the resistance more than 1
M&?
Is the same DTC displayed?
Is the same DTC displayed?
VDC(diag)-101
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 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
steering angle
sensor and
VDCCM&H/U.
Go to step 7. Repair the har-
ness between
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 & Hydraulic
Control Unit
(VDCCM&H/U).>
No