Subaru 2009 IMPREZA Service Manual page 481

ENGINE (DIAGNOSTICS)
D: MALFUNCTION INDICATOR LIGHT DOES NOT GO OFF
DIAGNOSIS:
The malfunction indicator light circuit is shorted.
TROUBLE SYMPTOM:
Although malfunction indicator light comes on when the engine runs, DTC is not shown on the Subaru Select
Monitor display.
WIRING DIAGRAM:
B136 ECM
B72
1 2 3
4 5 6
7
17 18 19 20
28 29
Step
1 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Turn the ignition switch to ON.
Malfunction Indicator Light
B72
No. 5
1
COMBINATION
METER
i10
i1
B36
B136
1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
8 9 10 11 12 13 14 15 16
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
21 22 23 24 25 26 27
30 31 32 33 34 35
EN(H4SO)(diag)-64
IGNITION
SWITCH
SBF-6
3
i10
Check
Does the malfunction indicator
light illuminate?
BATTERY
MAIN SBF
E
i1
1 2 3 4
5 6 7 8 9 10
11 12 13 14 15 16
17 18 19 20 21 22
23 24 25 26 27 28
Yes
Repair the short Replace the ECM.
circuit of harness <Ref. to
between ECM and FU(H4SO)-45,
combination meter Engine Control
connector. Module (ECM).>
EN-06660
No