Subaru LEGACY 2006 Manual page 956

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C: MALFUNCTION INDICATOR LIGHT DOES NOT COME ON
DIAGNOSIS:
The malfunction indicator light circuit is open or shorted.
TROUBLE SYMPTOM:
When the ignition switch is turned to ON (engine OFF), malfunction indicator light does not come on.
WIRING DIAGRAM:
B136 ECM
B72
1 2 3
4 5 6
Step
1 CHECK OUTPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B136) No. 11 (+) — Chassis ground (– ):
2 CHECK POOR CONTACT.
Check for poor connection by shaking or pull-
ing ECM connector and harness.
Malfunction Indicator Light
IGNITION
B72
SWITCH
No.5
6
COMBINATION
METER
i10
i3
B38
B136
1 2 3 4 5 6 1 2
7 8 9 10 11 12 13 14 15 16 11 12
17 18 19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35
Is the voltage less than 1 V?
Does the malfunction indicator
light illuminate?
EN(H4SO U5)(diag)-51
SBF-6 MAIN SBF
3
i10
3 4 5 6 7 8 9 10
1 2 3 4
13 14 15 16 17 18 19 20 21 22
10 11 12 13 14 15 16 17 18 19 20
Check
Go to step 4.
Repair the poor
contact of ECM
connector.
ENGINE (DIAGNOSTICS)
BATTERY
E
B38
5 6 7 8 9
EN-04018
Yes No
Go to step 2.
Go to step 3.