Subaru 2002 IMPREZA Service Manual page 509

DIAGNOSTICS FOR ENGINE STARTING FAILURE
Step
2 CHECK GROUND CIRCUIT OF FUEL PUMP.
1)Turn the ignition switch to OFF.
2)Remove the fuel pump access hole lid
located on the right rear of trunk compartment
floor (Sedan) or luggage compartment floor
(Wagon).
3)Disconnect the connector from fuel pump.
4)Measure the resistance of harness connec-
tor between fuel pump and chassis ground.
Connector & terminal
(R58) No. 4 — Chassis ground:
3 CHECK POWER SUPPLY TO FUEL PUMP.
1)Turn the ignition switch to ON.
2)Measure the voltage of power supply circuit
between fuel pump connector and chassis
ground.
Connector & terminal
(R58) No. 1 (+) — Chassis ground ( − − − − ):
4 CHECK HARNESS BETWEEN FUEL PUMP
AND FUEL PUMP RELAY CONNECTOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance of harness connec-
tor between fuel pump and fuel pump relay.
Connector & terminal
(R58) No. 1 — (B46) No. 4:
5 CHECK HARNESS BETWEEN FUEL PUMP
AND FUEL PUMP RELAY CONNECTOR.
Measure the resistance of harness between
fuel pump and fuel pump relay connector.
Connector & terminal
(R58) No. 1 — Chassis ground:
6 CHECK FUEL PUMP RELAY.
1)Disconnect the connectors from fuel pump
relay and main relay.
2)Remove the fuel pump relay and main relay
with bracket.
3)Connect the battery to fuel pump relay con-
nector terminals No. 1 and No. 3.
4)Measure the resistance between connector
terminals of fuel pump relay.
Terminals
No. 2 — No. 4:
Check
Is the resistance less than 5
Ω?
Is the voltage more than 10 V? Replace the fuel
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance less than 10
Ω?
EN-77
ENGINE (DIAGNOSTICS)
Yes
Go to step 3. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
fuel pump connec-
tor and chassis
grounding terminal
• Poor contact in
coupling connector
(R15)
Go to step 4.
pump. <Ref. to
FU-62, Fuel
Pump.>
Go to step 5. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
fuel pump connec-
tor and chassis
grounding terminal
• Poor contact in
coupling connec-
tors
(R15 and B97)
Go to step 6. Repair the short
circuit in harness
between fuel
pump and fuel
pump relay con-
nector.
Go to step 7. Replace the fuel
pump relay. <Ref.
to FU-53, Fuel
Pump Relay.>
No