Subaru LEGACY 2003 Service Manual page 57

DIAGNOSTICS FOR ENGINE STARTING FAILURE
Step
5 CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from #4 cylinder fuel
injector.
3) Turn ignition switch to ON.
4) Measure power supply voltage between the
fuel injector terminal and engine ground.
Connector & terminal
#4 (E17) No. 2 (+) — Engine ground (–):
Does the measured value exceed the spec-
ified value?
6 CHECK EACH FUEL INJECTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between each fuel
injector terminals.
Terminals
No. 1 — No. 2:
Is the measured value within the specified
value?
7 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1) Disconnect connector from ECM.
2) Measure resistance of harness between
ECM and fuel injector connector.
Connector & terminal
(B134) No. 4 — (B136) No. 2:
Is the measured value within the specified
value?
8 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B134) No. 4 — Chassis ground:
Is the measured value less than the specified
value?
9 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B134) No. 13 — (B136) No. 2:
Is the measured value within the specified
value?
Value
10 V
11 — 12 Ω
11 — 12 Ω
1 Ω
11 — 12 Ω
EN(H4SOw/oOBD)-55
ENGINE (DIAGNOSTICS)
Yes
Go to step 6. Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and fuel
injector connector
• Poor contact in
main relay con-
nector
• Poor contact in
coupling connec-
tors (B22)
• Poor contact in
fuel injector con-
nector
Go to step 7. Replace faulty fuel
injector.
Go to step 8. Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
(B22)
Repair ground Go to step 9.
short circuit in har-
ness between
ECM and fuel
injector connector.
Go to step 10. Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
(B22)
No