Subaru Legacy 2001 Service Manual page 87

DIAGNOSTICS FOR ENGINE STARTING FAILURE
No.
2 CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from #1 cylinder fuel
injector.
3) Turn ignition switch to ON.
4) Measure power supply voltage between the
fuel injector terminal and engine ground.
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
(–):
#5 (E43) No. 2 (+) — Engine ground
(–):
#6 (E44) No. 2 (+) — Engine ground
(–):
3 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
(B137) No. 1 — (B137) No. 3:
4 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B137) No. 1 — Chassis ground:
5 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B136) No. 6 — (B137) No. 3:
6 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure resistance of harness between ECM
and fuel injector connector.
Connector & terminal
(B136) No. 6 — Chassis ground:
Step
Is the voltage more than 10
V?
Is the resistance between 5
and 20 Ω?
Is the resistance less than
1 Ω?
Is the resistance between 5
and 20 Ω?
Is the resistance less than
1 Ω?
EN(H6)-85
Check Yes
Go to step 3.
Go to step 4.
Repair ground
short circuit in
harness between
ECM and fuel
injector connector.
Go to step 6.
Repair ground
short circuit in
harness between
ECM and fuel
injector connector.
Engine (DIAGNOSTICS)
No
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
main relay and
fuel injector con-
nector
¼ Poor contact in
main relay con-
nector
¼ Poor contact in
coupling connec-
tor
¼ Poor contact in
fuel injector con-
nector
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and fuel
injector connector
¼ Poor contact in
coupling connec-
tor
Go to step 5.
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and fuel
injector connector
¼ Poor contact in
coupling connec-
tor
Go to step 7.