Subaru IMPREZA 2002 Service Manual page 395

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DIAGNOSTICS FOR ENGINE STARTING FAILURE
ENGINE (DIAGNOSTICS)
Step
CHECK OPERATING SOUND OF FUEL
PUMP.
Make sure that fuel pump is in operation for
two seconds when turning the ignition switch to
ON.
NOTE:
Fuel pump operation can also be executed us-
ing Subaru Select Monitor (Function mode:
FDO1).
For the procedure, refer to "Compulsory Valve
Operation Check Mode". <Ref. to EN(S0HC)-
44, Compulsory Valve Operation Check
Mode.>
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:
1
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 (-):
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.
i
Connector & terminal
(R58) NO. 1
-
(846)
NO.
4:
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 around:
Check
loes the fuel pump produce
perating sound?
j
the resistance less than
5
l?
5
the voltage more than 10 V?
s
the resistance less than 1
2?
s the resistance more than 1
L m ?
~
Yes
;heck fuel injec-
3r circuit. <Ref. to
'UEL INJECTOR
:IRCUIT, Diag-
iostics for Engine
Starting Failure.>
iN(S0HC)-74,
; o to step 3.
3eplace the fuel
lump. <Ref. to
%el Pump.>
-U(SOHC)-59,
30 to step 5.
30 to step
6.
No
30 to step 2.
3epair harness
md connector.
IOTE:
n this case, repai
he following:
1
Open circuit in
iarness between
uel pump connec-
or and chassis
grounding termina
1
Poor contact in
:oupling connectoi
:R67)
30 to step
4.
Repair harness
m d connector.
VOTE:
In this case, repai
the following:
Open circuit in
harness between
fuel pump connec
tor and chassis
grounding termina
Poor contact in
coupling connec-
tors
(R67 and 697)
Repair short circui
in harness
between fuel pumr
and fuel pump
relay connector.
EN (SOH C)-71