Subaru Legacy 2002 Service Manual page 2654

DIAGNOSTICS CHART WITH SELECT MONITOR
No.
1 CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from VDCCM and
ECM.
3) Measure resistance between VDCCM and
ECM.
Connector & terminal
(F87) No. 75 — Chassis ground:
2 CHECK INPUT VOLTAGE FROM ECM.
1) Connect connector to VDCCM.
2) Turn ignition switch to ON.
3) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
H4 ENGINE MODEL
(B134) No. 33 (+) — Chassis ground
(−):
H6 ENGINE MODEL
(B136) No. 11 (+) — Chassis ground
(−):
3 CHECK POOR CONTACT IN ECM CON-
NECTORS.
4 ERASE MEMORY.
1) Connect all connectors.
2) Erase the memory.
5 CHECK DIAGNOSTIC TROUBLE CODE.
1) Perform inspection mode.
2) Read out the diagnostic trouble code.
Step
Is the resistance more than
1 MΩ?
Is the voltage between 10
and 15 V?
Is there poor contact in
ECM connector?
Can the memory be
erased?
Is the same diagnostic
trouble code as in the cur-
rent diagnosis still being
output?
VDC-195
Check Yes
Go to step 2.
Go to step 4.
Replace ECM. H4
ENGINE MODEL
<Ref. to FU-51,
Engine Control
Module.> or <Ref.
to FU(H6)-47,
Engine Control
Module.>
Go to step 5.
Replace ECM. H4
ENGINE MODEL
<Ref. to FU-51,
Engine Control
Module.> or <Ref.
to FU(H6)-47,
Engine Control
Module.>
VDC (Diagnostics)
No
Repair or replace
ground short cir-
cuit between
VDCCM and
ECM.
Go to step 3.
Repair or replace
ECM connector.
Replace VDCCM.
<Ref. to VDC-9,
VDC Control Mod-
ule (VDCCM).>
A temporary poor
contact.