Subaru LEGACY Service Manual page 70

ENGINE (DIAGNOSTICS)
Step
1 CHECK OPTION CODE.
2 CHECK OPERATION OF EACH FUEL INJEC-
TOR.
While cranking the engine, check each fuel
injector emits operating sound. Use a sound
scope or apply a screwdriver to the injector for
this check.
3 CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between
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 (
4 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and fuel injector connector.
Connector & terminal
#1 (B136) No. 6 — (E5) No. 1:
#2 (B136) No. 5 — (E16) No. 1:
#3 (B136) No. 4 — (E6) No. 1:
#4 (B136) No. 3 — (E17) No. 1:
5 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure the resistance of harness between
ECM and fuel injector connector.
Connector & terminal
#1 (B136) No. 6 — Chassis ground:
#2 (B136) No. 5 — Chassis ground:
#3 (B136) No. 4 — Chassis ground:
#4 (B136) No. 3 — Chassis ground:
Diagnostics for Engine Starting Failure
Is the option code EC, EK or
K4?
Does the fuel pump emit oper-
ating sound?
Is the voltage more than 10 V? Go to step 4.
−
):
−
):
−
):
−
):
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
EN(H4SO 2.5)(diag)-68
Check
Go to step 2.
Check the fuel
pressure. <Ref. to
ME(H4SO 2.0)-27,
INSPECTION,
Fuel Pressure.>
Go to step 5.
Go to step 6.
Yes No
Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-66, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.
Go to step 3.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and fuel
injector connector
• Poor contact in
main relay connec-
tor
• Poor contact in
coupling connector
• Poor contact in
fuel injector con-
nector
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
Repair the ground
short circuit in har-
ness between
ECM and fuel
injector connector.