Subaru Legacy 2002 Service Manual page 1286

DIAGNOSTICS FOR ENGINE STARTING FAILURE
No.
1 CHECK OPERATING SOUND OF FUEL
PUMP.
Make sure that fuel pump is in operation for
two seconds when turning ignition switch to
ON.
NOTE:
Fuel pump operation can also be executed
using Subaru Select Monitor (Function mode:
FD01).
For the procedure, refer to "Compulsory Valve
Operation Check Mode". <Ref. to EN(H6)-50,
Compulsory Valve Operation Check Mode.>
2 CHECK GROUND CIRCUIT OF FUEL PUMP.
1) Turn ignition switch to OFF.
2) Remove fuel pump access hole lid located
on the right rear of luggage compartment floor
(Wagon).
3) Disconnect connector from fuel pump.
4) Measure resistance of harness connector
between fuel pump and chassis ground.
Connector & terminal
(R58) No. 1 — Chassis ground:
3 CHECK POWER SUPPLY TO FUEL PUMP.
1) Turn ignition switch to ON.
2) Measure voltage of power supply circuit
between fuel pump connector and chassis
ground.
Connector & terminal
(R58) No. 2 (+) — Chassis ground (−):
4 CHECK HARNESS BETWEEN FUEL PUMP
AND FUEL PUMP RELAY CONNECTOR.
1) Turn ignition switch to OFF.
2) Measure resistance of harness connector
between fuel pump and fuel pump relay.
Connector & terminal
(R58) No. 2 — (B46) No. 4:
5 CHECK HARNESS BETWEEN FUEL PUMP
AND FUEL PUMP RELAY CONNECTOR.
Measure resistance of harness between fuel
pump and fuel pump relay connector.
Connector & terminal
(R58) No. 2 — Chassis ground:
Step
Does fuel pump produce
operating sound?
Is the resistance less than
5 Ω?
Is the voltage more than 10
V?
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
EN(H6)-79
Check Yes
Check fuel injec-
tor circuit. <Ref. to
EN(H6)-82, FUEL
INJECTOR
CIRCUIT, Diag-
nostics for Engine
Starting Failure.>
Go to step 3.
Replace fuel
pump. <Ref. to
FU(H6)-64, Fuel
Pump.>
Go to step 5.
Go to step 6.
Engine (DIAGNOSTICS)
No
Go to step 2.
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
fuel pump con-
nector and chas-
sis grounding ter-
minal
¼ Poor contact in
coupling connec-
tor
Go to step 4.
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
fuel pump con-
nector and chas-
sis grounding ter-
minal
¼ Poor contact in
coupling connec-
tors
Repair short cir-
cuit in harness
between fuel
pump and fuel
pump relay con-
nector.