LAN(diag)-49
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
3
CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect all control module connectors
(B280, B310, B136, B230, B231, B380) that are
connected to high speed CAN communication
line.
3) Connect the disconnected connectors.
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1202 a current malfunc-
tion?
Go to step
4.
Go to step
10.
4
CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect all control module connectors
(B280, B310, B136, B230, B231, B380) that are
connected to high speed CAN communication
line.
3) Using the tester, check for open, short
(power supply-output short, GND-output short)
in the harness.
Connector & terminal
(B40) No. 6 — (B136) No. 17:
(B40) No. 6 — (B310) No. 35:
(B40) No. 6 — (B230) No. 2:
(B40) No. 6 — (B231) No. 2:
(B40) No. 6 — (B380) No. 2 (with SI-
DRIVE):
(B40) No. 6 — (B280) No. 3:
Is harness normal?
Go to step
5.
Repair or replace
the harness.
5
CHECK HARNESS.
Using the tester, check for open, short (power
supply-output short, GND-output short) in the
harness.
Connector & terminal
(B40) No. 14 — (B136) No. 28:
(B40) No. 14 — (B310) No. 10:
(B40) No. 14 — (B230) No. 3:
(B40) No. 14 — (B231) No. 1:
(B40) No. 14 — (B380) No. 18 (with SI-
DRIVE):
(B40) No. 14 — (B280) No. 9:
Is harness normal?
Go to step
6.
Repair or replace
the harness.
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±5 Ω?
Go to step
7.
Replace the ECM.
<Ref. to FU(STI)-
59, REMOVAL,
Engine Control
Module (ECM).>
<Ref. to FU(w/o
STI)-57,
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±5 Ω?
Go to step
8.
Replace the VDC/
ABS CM. <Ref. to
VDC-8,
REMOVAL, VDC
Control Module
and Hydraulic Con-
trol Unit
(VDCCM&H/U).>
Step
Check
Yes
No