LAN(diag)-68
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK DTC.
Read all DTCs using the Subaru Select Monitor.
<Ref. to LAN(diag)-15, READ DIAGNOSTIC
TROUBLE CODE (DTC), OPERATION, Subaru
Select Monitor.>
Is there U1202, or any DTC
other than for the body inte-
grated unit?
Perform the diag-
nosis according to
DTC.
Go to step
2
.
2
CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1222 a current malfunc-
tion?
Go to step
3
.
Go to step
7
.
3
CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect all connectors (B280, B310 or
B301, B55, B136, B230, B231) that are con-
nected 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 U1222 a current malfunc-
tion?
Go to step
4
.
Go to step
7
.
4
CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect all connectors (B280, B310 or
B301, B55, B136, B230, B231) that are con-
nected to high speed CAN communication line.
3) Using the tester, inspect the open circuit of
harness and short (power supply-output short,
GND-output short).
Connector & terminal
(B55) No. 17 — (B40) No. 14:
(B55) No. 18 — (B40) No. 6:
Is harness normal?
Go to step
5
.
Repair or replace
the harness.
5
CHECK DTC.
1) Connect the disconnected connectors.
2) Start the engine.
3) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1222 a current malfunc-
tion?
Go to step
6
.
Go to step
7
.
6
CHECK DTC.
Using the Subaru Select Monitor, read all
DTCs.
Are DTCs P0600 or P0044,
P0045, C0140 displayed?
Replace the TCM.
<Ref. to 4AT-63,
Transmission Con-
trol Module
(TCM).>
Replace the body
integrated unit.
<Ref. to SL-50,
REMOVAL, Body
Integrated Unit.>
7
CHECK HARNESS.
1) Shake the harness used for CAN communi-
cation circuit.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1222 a current malfunc-
tion?
Repair or replace
the harness.
Go to step
8
.
8
CHECK CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect all the connector that is con-
nected to high speed CAN circuit.
Is there poor contact of connec-
tor terminal?
Repair the connec-
tor terminal where
poor contact
exists, or replace
harness.
Temporary poor
contact occurs.
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