Subaru IMPREZA GD 2007 Series Manual page 1617

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
11 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector
on faulty cylinders.
3) Measure the resistance between the fuel
injector connector and engine ground on faulty
cylinders.
Connector & terminal
#1 (E5) No. 1 — Engine ground:
#2 (E16) No. 1 — Engine ground:
#3 (E6) No. 1 — Engine ground:
#4 (E17) No. 1 — Engine ground:
12 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR.
Measure the resistance of harness between the
ECM and fuel injector on faulty cylinders.
Connector & terminal
#1 (B137) No. 8 — (E5) No. 1:
#2 (B137) No. 9 — (E16) No. 1:
#3 (B137) No. 10 — (E6) No. 1:
#4 (B137) No. 11 — (E17) No. 1:
13 CHECK FUEL INJECTOR.
Measure the resistance between fuel injector
terminals on faulty cylinder.
Terminals
No. 1 — No. 2:
14 CHECK POWER SUPPLY LINE.
1) Turn the ignition switch to ON.
2) Measure the voltage between fuel injector
and engine ground on faulty cylinders.
Connector & terminal
#1 (E5) No. 2 (+) — Engine ground (–):
#2 (E16) No. 2 (+) — Engine ground (–):
#3 (E6) No. 2 (+) — Engine ground (–):
#4 (E17) No. 2 (+) — Engine ground (–):
Check
Is the resistance 1 MΩ or more? Go to step 12.
Is the resistance less than 1 Ω? Go to step 13.
Is the resistance between 5 —
20 Ω?
Is the voltage 10 V or more?
EN(STI)(diag)-286
Yes No
Repair the ground
short circuit of har-
ness between
ECM and fuel
injector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and fuel in-
jector connector
• Poor contact of
coupling connector
Go to step 14.
Replace the faulty
fuel injector. <Ref.
to FU(H4DOTC)-
37, Fuel Injector.>
Repair the poor Repair the harness
contact of all con- and connector.
nectors in fuel
NOTE:
injector circuit.
In this case, repair
the following item:
• Open circuit of
harness between
the main relay and
fuel injector con-
nector on faulty
cylinders
• Poor contact of
coupling connector
• Poor contact of
main relay connec-
tor
• Poor contact of
fuel injector con-
nector on faulty
cylinders