Wiring Diagram - Subaru 2004 Impreza Service Manual

ENGINE (DIAGNOSTICS)
C: MALFUNCTION INDICATOR LIGHT DOES NOT COME ON.
• DIAGNOSIS:
• The malfunction indicator light circuit is shorted.
• TROUBLE SYMPTOM:
• When the ignition switch is turned to ON (engine OFF), malfunction indicator light does not come on.

• WIRING DIAGRAM:

C7
A6
COMBINATION
METER
A :
i12
C :
i11
B72
1 2
3 4
i2
1 2 3 4 5 6 7
12 13 14 15 16 17 18 19 20 21 22
Step
1 CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B84) No. 15 (+) — Chassis ground ( − − − − ):
2 CHECK POOR CONTACT.
Malfunction Indicator Light
No.13
LHD RHD
B37
B37
i2
i2
LHD RHD
2
*
* 3
B84 ECM
A: i12
1 2 3 4 5 6
7 8 9 10 11 12 13 14
: LHD
1 2 3 4
8 9 10 11
10 11 12 13 14 15
23 24
22 23 24 25 26 27 28 29
EN(H4DOTC)(diag)-52
IGNITION
B72
SWITCH
4 1
1 LHD : 14
*
RHD : 13
2 LHD :
*
i1
RHD : i2
3 LHD :
*
B36
RHD :
B37
C: i11
1 2 3 4 5 6 7 8 9 10
i2
: RHD
5 6 7 8 9
1 2 3 4
16 17 18 19 20 21
12 13 14 15 16 17 18 19 20 21 22 23 24
30 31 32
Check
Is the voltage less than 1 V?
Does the malfunction indicator
light come on when shaking or
pulling ECM connector and
harness?
BATTERY
SBF-4 SBF-1
B84
1 2 3 4 5 6
10 11 12 13 14 15 16 17
22 23 24 25 26 27 28
i1
5 6 7 8 9 10 11
Yes
Go to step 4. Go to step 2.
Repair the poor Go to step 3.
contact in ECM
connector.
E
7 8 9
18 19 20 21
29 30 31
EN-02557
No