Subaru B9 TRIBECA WX 2007 Manual page 622

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
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:
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.
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:
15 CHECK CONTROL MODULE.
Connect the tester to ECM terminal, and mea-
sure the resistance.
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 (–):
17 CHECK CONTROL MODULE.
Disconnect each control module connector one
by one with the tester connected to vehicle side
harness.
18 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:
19 CHECK CONTROL MODULE.
Disconnect each control module connector one
by one with the tester connected to vehicle side
harness.
Check
Is the resistance between 115
— 125 Ω?
Is the resistance between 115
— 125 Ω?
Is the resistance between 115
— 125 Ω?
Is the resistance between 115
— 125 Ω?
Is the voltage 6 V or more?
Is there any module whose volt-
age changes to less than 6 V?
Is the resistance less than 10
Ω?
Is there any module which its
resistance changes to more
than 10 Ω?
LAN(diag)-47
LAN SYSTEM (DIAGNOSTICS)
Yes No
Go to step 13. Go to step 14.
Go to step 20. Replace the
VDCCM. <Ref. to
VDC-8, VDC Con-
trol Module and
Hydraulic Control
Unit (VDCCM&H/
U).>
Go to step 15.
Repair or replace
the open circuit of
main wiring har-
ness.
Go to step 16.
Replace the ECM.
<Ref. to
FU(H6DO)-33,
Engine Control
Module (ECM).>
Go to step 17. Go to step 18.
Replace the mod- Repair or replace
ule whose voltage the short circuit of
dropped to 6 V or the harness.
less.
Go to step 19. Repair or replace
the short circuit of
the harness.
Replace the mod- Repair or replace
ule whose resis- the short circuit of
tance changed to the harness.
10 Ω or more.