Subaru 2009 IMPREZA Service Manual page 3394

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
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.>
2 CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor.
3 CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM.
3) Connect the disconnected connectors.
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
4 CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Shake the harness used for CAN communi-
cation circuit.
3) Turn the ignition switch to ON.
4) Read the DTC of body integrated unit using
Subaru Select Monitor.
5 CHECK CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector that is connected
to high speed CAN circuit.
Check
Is there DTC U1202?
Is U1212 a current malfunc-
tion?
Is U1212 a current malfunc-
tion?
Is U1212 a current malfunc-
tion?
Is there poor contact of connec-
tor terminal?
LAN(diag)-61
LAN SYSTEM (DIAGNOSTICS)
Yes No
Perform the diag- Go to step 2.
nosis according to
DTC.
Go to step 3. Go to step 4.
Replace the TCM. Go to step 4.
<Ref. to 4AT-63,
Transmission Con-
trol Module
(TCM).>
Repair or replace Go to step 5.
the harness.
Repair the connec- Temporary poor
tor terminal, or contact occurs.
replace harness.