Subaru IMPREZA 2004 Service Manual page 358

ENGINE (DIAGNOSTICS)
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 ON (engine OFF), malfunction indicator light does not come on.
• WIRING DIAGRAM:
COMBINATION
METER
A:
i12
C:
i11
LHD
i1
B36
LHD
B72
1 2
1 2
12 13 14 15 16 17 18 19 20 21 22 23 24
3 4
i2
: LHD
1 2 3 4 5 6 7
12 13 14 15 16 17 18 19 20 21 22 23 24
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
(B134) No. 28 (+) — Chassis ground ( − − − − ):
2 CHECK POOR CONTACT.
Check poor contact by shaking or pulling ECM
connector and harness.
Malfunction Indicator Light
No.13
B37
i2
RHD
i2
B37
RHD
ECM
B134
i1
3 4 5 6 7 8 9 10 11
i11
8 9 10 11
1 2 3 4 5 6 7 8 9 10
EN(H4SO)(diag)-52
IGNITION
B72
SWITCH
SBF-4
4 1
LHD: 14
*
RHD: 31
B134
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 29 30 31 32 33 34 35
i12
1 2 3 4 5 6
7 8 9 10 11 12 13 14
Check
Is the voltage less than 1 V?
Does the malfunction indicator
light illuminate?
BATTERY
SBF-1
i2
: RHD
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 29 30 31 32
Yes
Go to step 4. Go to step 2.
Repair poor con- Go to step 3.
tact in ECM con-
nector.
E
EN-01417
No