Subaru Legacy 2001 Service Manual page 83

DIAGNOSTICS FOR ENGINE STARTING FAILURE
No.
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:
6 CHECK FUEL PUMP RELAY.
1) Disconnect connectors from fuel pump
relay and main relay.
2) Remove fuel pump relay and main relay
with bracket.
3) Connect battery to fuel pump relay connec-
tor terminals No. 1 and No. 3.
4) Measure resistance between connector
terminals of fuel pump relay.
Terminals
No. 2 — No. 4:
Step
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?
Is the resistance less than
10 Ω?
EN(H6)-81
Check Yes
Go to step 3.
Replace fuel
pump. <Ref. to
FU(H6)-63, Fuel
Pump.>
Go to step 5.
Go to step 6.
Go to step 7.
Engine (DIAGNOSTICS)
No
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.
Replace fuel
pump relay. <Ref.
to FU(H6)-48,
Fuel Pump
Relay.>