Subaru 2002 IMPREZA Service Manual page 902

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
B: DTC 12 STARTER SWITCH
• DIAGNOSIS:
• The starter switch signal is abnormal.
• The harness connector between ECM and starter switch is open or shorted.
• TROUBLE SYMPTOM:
• Failure of engine to start
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES. <Ref.
to EN(w/oOBD)-30, OPERATION, Clear Memory Mode.> and <Ref. to EN(w/oOBD)-28, OPERATION,
Inspection Mode.>
• WIRING DIAGRAM:
B135 ECM
28
B72 B12
1 2 3 4
1 2
5 6 7 8
3 4
9 10 11 12
Step
1 CHECK OPERATION OF STARTER MOTOR. Does the starter motor oper-
SBF-4
IGNITION
SWITCH
B72
AT
B12
AT
B14
STARTER
MOTOR
T7
1 2 3 4 5 6
7 8 9 10 11 12
EN(w/oOBD)-68
BATTERY
SBF-1
INHIBITOR SWITCH
P R N D
12 12
11 7
T3 T7
B135
1 2 3
8 9 10 11 12 13 14 15
20 21 22 23 24 25
Check
ate when ignition switch is
turned to START?
3 2 1
5 6 7
4
16 17 18 19
26 27 28
Yes
Go to step 2. Check the starter
motor circuit.
EN0862
No