Subaru IMPREZA 2004 Service Manual page 748

ENGINE (DIAGNOSTICS)
F: FUEL INJECTOR CIRCUIT
CAUTION:
• Check or repair only the faulty parts.
• After repair or replacement of the faulty parts, conduct the Clear Memory and inspection modes.
<Ref. to EN(H4SOw/oOBD)(diag)-28, OPERATION, Clear Memory Mode.> and <Ref. to EN(H4SOw/
oOBD)(diag)-26, OPERATION, Inspection Mode.>
• WIRING DIAGRAM:
MAIN RELAY
4
6
5
3
2
1
B47
FUEL INJECTOR
No.1
E5 E16
E6 E17
1 2
C: B136
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
Step
1 CHECK OPERATION OF EACH FUEL INJEC-
TOR.
While cranking the engine, check that each
fuel injector emits "operating" sound. Use a
sound scope or attach a screwdriver to injector
for this check.
Diagnostics for Engine Starting Failure
A: B134
E5 E16
FUEL INJECTOR
No.2
B47
1 2
3 4
5 6
A: B134
1 2 3 4 5 6
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
30
24 25 26 27 28 29 30 31 32 33
EN(H4SOw/oOBD)(diag)-52
SBF-5
LHD LHD
2
B61 F44
C: B136 ECM
E6
FUEL INJECTOR FUEL INJECTOR
No.3
F44
1 2 3 4
5 6 7 8
7 8
34 35
Check
Does the fuel injector emit
"operating" sound?
BATTERY
B22
E3
E17
E
No.4
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
Yes
Check the fuel Go to step 2.
pressure. <Ref. to
ME(H4SO)-31,
INSPECTION,
Fuel Pressure.>
EN-01552
No