Subaru 2009 IMPREZA Service Manual page 3386

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
8 CHECK DTC.
1) Turn the ignition switch to ON.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
9 CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor.
10 CHECK ECM.
1) Turn the ignition switch to OFF.
2) Connect the VDC/ABS CM.
3) Disconnect the ECM connector (B136).
4) Install the 120
tor.
Terminals
(B136) No. 27 — No. 35:
5) Using the tester, measure the resistance
between terminals of data link connector.
Connector & terminal
(B40) No. 6 — No. 14:
11 CHECK DTC.
1) Turn the ignition switch to ON.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
12 CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor.
13 CHECK DTC.
1) Reconnect all the disconnected connectors.
2) Turn the ignition switch to ON.
3) Read the DTC of body integrated unit using
Subaru Select Monitor.
14 CHECK HARNESS.
1) Shake the instrument harness and bulk-
head harness, rear harness.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1201 a current malfunc-
tion?
Is U1202 a current malfunc-
tion?
Is the resistance 60 ?
resistance to ECM connec-
Is U1201 a current malfunc-
tion?
Is U1202 a current malfunc-
tion?
Is U1201 a current malfunc-
tion?
Is U1201 a current malfunc-
tion?
LAN(diag)-53
LAN SYSTEM (DIAGNOSTICS)
Check Yes
Go to step 16.
Replace the VDC/
ABS CM. <Ref. to
ABS-6,
REMOVAL, ABS
Control Module
and Hydraulic Con-
trol Unit
(ABSCM&H/U).>
<Ref. to VDC-7,
REMOVAL, VDC
Control Module
and Hydraulic Con-
trol Unit
(VDCCM&H/U).>
Go to step 11.
Go to step 12.
Replace the ECM.
<Ref. to
FU(H4SO)-45,
REMOVAL, Engine
Control Module
(ECM).> <Ref. to
FU(H4DOTC)-52,
REMOVAL, Engine
Control Module
(ECM).>
Replace the body
integrated unit.
<Ref. to SL-50,
REMOVAL, Body
Integrated Unit.>
Repair or replace
the harness.
No
Go to step 9.
Go to step 10.
Repair or replace
the open circuit of
harness.
Repair or replace
the open circuit of
measured related
harness.
Go to step 13.
Go to step 14.
Go to step 15.