Subaru Legacy 2002 Service Manual page 2542

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
No.
1 CHECK GENERATOR.
1) Start engine.
2) Idling after warm-up.
3) Measure voltage between generator B ter-
minal and chassis ground.
Terminal
Generator B terminal — Chassis
ground:
2 CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
3 CHECK INPUT VOLTAGE OF VDCCM.
1) Disconnect connector from VDCCM.
2) Run the engine at idle.
3) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
(F87) No. 28 (+) — Chassis ground (−):
4 CHECK GROUND CIRCUIT OF VDCCM.
1) Turn ignition switch to OFF.
2) Measure resistance between VDCCM con-
nector and chassis ground.
Connector & terminal
(F87) No. 1 — Chassis ground:
(F87) No. 55 — Chassis ground:
5 CHECK POOR CONTACT IN CONNEC-
TORS.
6 CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the diagnostic trouble code.
7 CHECK ANY OTHER DIAGNOSTIC
TROUBLE CODES APPEARANCE.
Step
Is the voltage between 10
and 15 V?
Are the positive and nega-
tive battery terminals tightly
clamped?
Is the voltage between 10
and 15 V?
Is the resistance less than
0.5 Ω?
Is there poor contact in
connectors between
generator, battery and
VDCCM?
Is the same diagnostic
trouble code as in the cur-
rent diagnosis still being
output?
Are other diagnostic trouble
codes being output?
VDC-83
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Repair connector.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.
VDC (Diagnostics)
No
Repair generator.
Tighten the clamp
of terminal.
Repair harness
connector
between battery,
ignition switch and
VDCCM.
Repair VDCCM
ground harness.
Go to step 6.
Go to step 7.
A temporary poor
contact.