Subaru FORESTER 2001 Service Manual page 82

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
(–):
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 — (E5) No. 1:
(B136) No. 6 — (E16) No. 1:
(B136) No. 5 — (E6) No. 1:
(B136) No. 4 — (E6) No. 1:
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:
(B136) No. 6 — Chassis ground:
(B136) No. 5 — Chassis ground:
(B136) No. 4 — Chassis ground:
5 CHECK EACH FUEL INJECTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between each fuel
injector terminals.
Terminals
No. 1 — No. 2:
6 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Step
Is the voltage more than 10
V?
Is the resistance less than
1 Ω?
Is the resistance less than
1 Ω?
Is the resistance between 5
and 20 Ω?
Is there poor contact in
ECM connector?
EN(DOHC TURBO)-81
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 poor con-
tact in ECM con-
nector.
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.
Replace faulty
fuel injector.
Inspection using
"General Diagnos-
tic Table". <Ref. to
EN(DOHC
TURBO)-344,
INSPECTION,
General Diagnos-
tic Table.>