Subaru Legacy 2004 Service Manual page 3185

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Step
1 CHECK POWER SUPPLY FOR YAW RATE &
LATERAL G SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from yaw rate &
lateral G sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between yaw rate &
lateral G sensor and chassis ground.
Connector & terminal
(B230) No. 3 (+) — 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 GROUND CIRCUIT OF YAW RATE &
LATERAL G SENSOR.
Measure the resistance between yaw rate &
lateral G sensor and chassis ground.
Connector & terminal
(B230) No. 6 — Chassis ground:
4 CHECK GROUND CIRCUIT FOR VDCCM&H/
U.
Measure the resistance between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 16 — Chassis ground:
5 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
6 CHECK HARNESS OF YAW RATE & LATER-
AL G SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from VDCCM&H/
U.
3) Measure the resistance between
VDCCM&H/U and yaw rate & lateral G sensor.
Connector & terminal
(B310) No. 1 — (B230) No. 1:
7 CHECK GROUND SHORT CIRCUIT OF HAR-
NESS.
Measure the resistance between VDCCM&H/U
and chassis ground.
Connector & terminal
(B310) No. 1 — Chassis ground:
8 CHECK THE YAW RATE & LATERAL G SEN-
SOR.
1) Turn the ignition switch to OFF.
2) Install the yaw rate & lateral G sensor to
body.
3) Connect all the connectors.
4) Turn the ignition switch to ON.
5) Measure the voltage between VDCCM&H/
U connector terminals.
Connector & terminal
(B310) No. 1 (+) — No. 16 (
Is the voltage 10 — 15 V?
#
):
Is the voltage 10 — 15 V?
#
):
Is the resistance less than 0.5
&?
Is the resistance less than 0.5
&?
nector?
Is the resistance less than 0.5
&?
Is the resistance more than 1
M&?
Is the voltage 2.1 — 2.9 V?
#
):
VDC(diag)-112
Check Yes
Go to step 3.
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
Go to step 6.
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
Correct or replace
the connector.
Go to step 7.
Go to step 8.
Go to step 9.
No
Go to step 2.
Go to step 5.
Go to step 4.
Go to step 5.
Go to step 9.
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
Repair the har-
ness between yaw
rate & lateral G
sensor and
VDCCM&H/U.
Replace the yaw
rate & lateral G
sensor. <Ref. to
VDC-14, Yaw Rate
& Lateral G Sen-
sor.>