Subaru Legacy 2002 Service Manual page 2715

DIAGNOSTICS CHART WITH SELECT MONITOR
VDC (Diagnostics)
No.
1 CHECK OUTPUT OF YAW RATE AND LAT-
ERAL G SENSOR USING SELECT MONI-
TOR.
1) Stop the vehicle on a flat road.
2) Select "Current data display & Save" on
the select monitor.
3) Read yaw rate and lateral G sensor output
on the select monitor display.
2 CHECK POOR CONTACT IN CONNEC-
TORS.
Turn ignition switch to OFF.
3 CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the diagnostic trouble code.
4 CHECK ANY OTHER DIAGNOSTIC
TROUBLE CODES APPEARANCE.
5 CHECK INPUT VOLTAGE OF YAW RATE
AND LATERAL G SENSOR.
1) Turn ignition switch to OFF.
2) Remove console box.
3) Disconnect connector from yaw rate and
lateral G sensor.
4) Turn ignition switch to ON.
5) Measure voltage between yaw rate and
lateral G sensor connector terminals.
Connector & terminal
(R100) No. 3 (+) — No. 6 (−):
6 CHECK YAW RATE AND LATERAL G SEN-
SOR.
1) Turn ignition switch to OFF.
2) Measure resistance between yaw rate and
lateral G sensor terminals.
Terminals
No. 3 — No. 5:
7 CHECK OPEN CIRCUIT IN YAW RATE AND
LATERAL G SENSOR OUTPUT HARNESS
AND GROUND HARNESS.
1) Connect connector to yaw rate and lateral
G sensor.
2) Disconnect connector from VDCCM.
3) Measure resistance between VDCCM con-
nector terminals.
Connector & terminal
(F87) No. 70 — No. 64:
8 CHECK GROUND SHORT IN YAW RATE
AND LATERAL G SENSOR HARNESS.
1) Disconnect connector from yaw rate and
lateral G sensor.
2) Measure resistance between VDCCM con-
nector and chassis ground.
Connector & terminal
(F87) No. 63 — Chassis ground:
(F87) No. 70 — Chassis ground:
(F87) No. 64 — Chassis ground:
Step
Is the yaw rate and lateral
G sensor output on monitor
display 2.5±0.2 V?
Is there poor contact in
connector between
VDCCM and yaw rate and
lateral G sensor?
Is the same diagnostic
trouble code as in the cur-
rent diagnosis still being
output?
Are other diagnostic trouble
codes being output?
Is the voltage between 10
and 15 V?
Is the resistance between
4.3 and 4.9 kΩ?
Is the resistance between
4.3 and 4.9 kΩ?
Is the resistance more than
1 MΩ?
VDC-256
Check Yes
Go to step 2.
Repair connector.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.
Go to step 6.
Go to step 7.
Go to step 8.
Go to step 9.
No
Go to step 5.
Go to step 3.
Go to step 4.
A temporary poor
contact.
Repair harness/
connector
between yaw rate
and lateral G sen-
sor and VDCCM.
Replace yaw rate
and lateral G sen-
sor. <Ref. to VDC-
22, Yaw Rate and
Lateral G Sen-
sor.>
Repair harness/
connector
between yaw rate
and lateral G sen-
sor and VDCCM.
Repair harness
between yaw rate
and lateral G sen-
sor and VDCCM.