Subaru Legacy 2005 Service Manual page 4182

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
8 CHECK VDC/ABSCM.
1) Disconnect the VDC/ABSCM connector.
2) Measure the resistance between VDC/
ABSCM terminals.
Terminals
ABS
No. 11 — No. 26:
VDC
No. 13 — No. 29:
9 CHECK ECM.
1) Disconnect the ECM connector.
2) Measure the resistance between ECM ter-
minals.
Terminals
2.0 L SOHC RHD model, 2.5 L (KA) RHD
model, 2.0 L LHD model and 2.5 L (KS)
LHD model
(B136) No. 13 — No. 14:
Except for 2.0 L SOHC RHD and 2.5 L
(KA) RHD model, 2.5 L (EC, K4) LHD mod-
el, 3.0 L LHD model
(B137) No. 18 — No. 26:
10 CHECK HARNESS.
1) Disconnect the body integrated module
connector.
2) Measure the resistance between body inte-
grated module connector and chassis ground.
Connector & terminal
(B280) No. 20 — Chassis ground:
(B280) No. 30 — Chassis ground:
11 CHECK HARNESS.
1) Disconnect the body integrated module
connector.
2) Measure the voltage between body inte-
grated module connector and chassis ground.
Connector & terminal
(B280) No. 20 (+) — Chassis ground (
(B280) No. 30 (+) — Chassis ground (
12 CHECK DTC.
Read the DTC of ECM using Subaru Select
Monitor. <Ref. to EN(H4SO 2.0)(diag)-25,
READ DIAGNOSTIC TROUBLE CODE (DTC)
FOR ENGINE (NORMAL MODE), OPERA-
TION, Subaru Select Monitor.> <Ref. to
EN(H4DOTC)(diag)-24, READ DIAGNOSTIC
TROUBLE CODE (DTC) FOR ENGINE (NOR-
MAL MODE), OPERATION, Subaru Select
Monitor.>
Check
Is the resistance 115 — 125
Ω?
Is the resistance 115 — 125
Ω?
Is the resistance less than 10
Ω?
Is the voltage more than 6 V?
−
):
−
):
Is DTC other than "CAN com-
munication" displayed on Sub-
aru Select Monitor?
LAN(diag)-52
Yes
Go to step 9. Open harness in
end resistance of
VDC/ABSCM.
Replace the VDC/
ABSCM. <Ref. to
ABS-6, ABS Con-
trol Module and
Hydraulic Control
Unit (ABSCM&H/
U).> <Ref. to VDC-
7, VDC Control
Module and
Hydraulic Control
Unit (VDCCM&H/
U).>
Repair or replace Open harness in
the open circuit of end resistance of
harness connec- ECM. Replace the
tor. ECM. <Ref. to
FU(H4SO 2.0)-34,
Engine Control
Module (ECM).>
<Ref. to FU(H4SO
2.5)-37, Engine
Control Module
(ECM).> <Ref. to
FU(H4DOTC)-34,
Engine Control
Module (ECM).>
<Ref. to
FU(H6DO)-34,
Engine Control
Module (ECM).>
Repair or replace Go to step 11.
the ground short
circuit of the har-
ness.
Repair or replace Go to step 12.
the short circuit of
harness.
Perform the diag- Go to step 13.
nosis according to
DTC.
No