Subaru Legacy 2003 Service Manual page 3094

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
13 CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM and
chassis ground.
Connector & terminal
(F87) No. 65 (+) — Chassis ground ( − − − − ):
(F87) No. 66 (+) — Chassis ground ( − − − − ):
(F87) No. 67 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
14 CHECK YAW RATE AND LATERAL G SEN-
SOR.
1) Turn ignition switch to OFF.
2) Install yaw rate and lateral G sensor to
body.
3) Connect all connectors.
4) Turn ignition switch to ON.
5) Measure voltage between VDCCM connec-
tor terminals.
Connector & terminal
(F87) No. 66 (+) — No. 64 ( − − − − ):
Is the measured value within the specified
range?
15 CHECK YAW RATE AND LATERAL G SEN-
SOR.
1) Turn ignition switch to ON.
2) Check oscilloscope signal pattern between
VDCCM connector terminals.<Ref. to VDC-
17, WAVEFORM, MEASUREMENT, Con-
trol Module I/O Signal.>
Connector & terminal
(F87) No. 67 (+) — No. 64 ( − − − − ):
Is the oscilloscope pattern the same as
shown in the figure?
16 CHECK YAW RATE SENSOR.
Check oscilloscope pattern between yaw rate
and lateral G sensor terminals.<Ref. to VDC-
17, WAVEFORM, MEASUREMENT, Control
Module I/O Signal.>
Connector & terminal
(F87) No. 65 (+) — No. 64 ( − − − − ):
Is the oscilloscope pattern the same as shown
in the figure?
Value
0.5 V
2.1 — 2.9 V
Same pattern.
Same pattern.
VDC-121
VDC (DIAGNOSTICS)
Yes
Go to step 14. Repair harness
between yaw rate
and lateral G sen-
sor and VDCCM.
Go to step 15. Replace yaw rate
and lateral G sen-
sor. <Ref. to VDC-
22, Yaw Rate and
Lateral G Sensor.>
Go to step 16. Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
Replace VDCCM. Replace yaw rate
<Ref. to VDC-8, and lateral G sen-
VDC Control Mod- sor. <Ref. to VDC-
ule (VDCCM).> 8, VDC Control
Module
(VDCCM).>
No