Subaru B9 TRIBECA WX 2007, Manual

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LAN(diag)-47
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
12 CHECK HARNESS.
1) Disconnect the VDCCM connector.
2) Connect the tester to vehicle side harness,
and measure the resistance.
Connector & terminal
(B310) No. 20 — No. 34:
Is the resistance between 115
— 125
Ω ?
Go to step
13
. Go to step
14
.
13 CHECK CONTROL MODULE.
1) Connect the VDCCM connector.
2) Disconnect the connector from ECM.
3) Connect the tester to vehicle side harness,
and measure the resistance between terminals.
Is the resistance between 115
— 125
Ω
?
Go to step 20 . Replace the
VDCCM. <Ref. to
VDC-8, VDC Con-
trol Module and
Hydraulic Control
Unit (VDCCM&H/
U).>
14 CHECK HARNESS.
1) Connect the VDCCM connector.
2) Disconnect the connector from ECM.
3) Connect the tester to vehicle side harness,
and measure the resistance between terminals.
Connector & terminal
(B136) No. 27 — No. 35:
Is the resistance between 115
— 125
Ω
?
Go to step 15 . Repair or replace
the open circuit of
main wiring har-
ness.
15 CHECK CONTROL MODULE.
Connect the tester to ECM terminal, and mea-
sure the resistance.
Is the resistance between 115
— 125
Ω
?
Go to step 16 . Replace the ECM.
<Ref. to
FU(H6DO)-33,
Engine Control
Module (ECM).>
16 CHECK HARNESS.
1) Connect the control module connectors
except body integrated unit.
2) Connect the tester to vehicle side harness.
3) Turn the ignition switch to ON, and measure
the terminal voltage.
Connector & terminal
(B280) No. 20 (+) — Chassis ground (–):
Is the voltage 6 V or more? Go to step 17 . Go to step 1 8 .
17 CHECK CONTROL MODULE.
Disconnect each control module connector one
by one with the tester connected to vehicle side
harness.
Is there any module whose volt-
age changes to less than 6 V? Replace the mod-
ule whose voltage
dropped to 6 V or
less. Repair or replace
the short circuit of
the harness.
1 8 CHECK HARNESS.
1) Connect the control module connectors
except body integrated unit connector.
2) Connect the tester between vehicle side
harness and chassis ground, and measure the
resistance.
Connector & terminal
(B280) No. 20 — Chassis ground:
(B280) No. 30 — Chassis ground:
Is the resistance less than 10
Ω
?
Go to step 19 . Repair or replace
the short circuit of
the harness.
19 CHECK CONTROL MODULE.
Disconnect each control module connector one
by one with the tester connected to vehicle side
harness.
Is there any module which its
resistance changes to more
than 10
Ω
?
Replace the mod-
ule whose resis-
tance changed to
10
Ω
or more.
Repair or replace
the short circuit of
the harness.
Step Check Yes No
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