LAN(diag)-57
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
6
CHECK ECM.
1) Connect the ECM.
2) Using the tester, measure the resistance
between terminals of data link connector.
Connector & terminal
(B40) No. 6 — No. 14:
Is the resistance 120
r
5
:
?
Go to step
7
.
Replace the ECM.
<Ref. to
FU(H4SO)-45,
REMOVAL, Engine
Control Module
(ECM).> <Ref. to
FU(H4DOTC)-52,
REMOVAL, Engine
Control Module
(ECM).>
7
CHECK VDC/ABS CM.
1) Disconnect the ECM connector (B136).
2) Connect the VDC/ABS CM.
3) Using the tester, measure the resistance
between terminals of data link connector.
Connector & terminal
(B40) No. 6 — No. 14:
Is the resistance 120
r
5
:
?
Go to step
8
.
Replace the VDC/
ABS CM. <Ref. to
VDC-7,
REMOVAL, VDC
Control Module
and Hydraulic Con-
trol Unit
(VDCCM&H/U).>
8
CHECK HARNESS.
1) Connect the disconnected connectors.
2) Using the tester, measure the resistance
between terminals of data link connector and
chassis ground.
Connector & terminal
(B40) No. 6 — Chassis ground:
(B40) No. 14 — Chassis ground:
Is the resistance 1 M
:
or
more?
Go to step
9
.
Go to step
12
.
9
CHECK HARNESS.
1) Turn the ignition switch to ON.
2) Using the tester, measure the voltage
between terminals of data link connector and
chassis ground.
Connector & terminal
(B40) No. 6 — Chassis ground:
(B40) No. 14 — Chassis ground:
Is the voltage 6 V or more?
Go to step
13
.
Replace the body
integrated unit.
<Ref. to SL-50,
REMOVAL, Body
Integrated Unit.>
10
CHECK HARNESS.
1) Shake the harness.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1202 a current malfunc-
tion?
Repair or replace
the harness.
Go to step
11
.
11
CHECK CONNECTOR.
Disconnect the connector used for high speed
CAN circuit.
Is there poor contact of connec-
tor terminal?
Repair the connec-
tor terminal, or
replace harness.
It is possible that
temporary poor
contact occurs.
12
CHECK CONTROL MODULE.
With the tester connected, disconnect each
control module connector.
Is there any control module
whose resistance has
changed?
Replace the con-
trol module whose
resistance has
changed.
Repair or replace
the open or short
circuit of the har-
ness.
13
CHECK ECM.
With the tester connected, disconnect each
control module connector.
Is there any control module
whose voltage has changed?
Replace the con-
trol module whose
voltage has
changed.
Repair or replace
the short circuit of
the harness.
Step
Check
Yes
No
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