Subaru Legacy 2002 Service Manual page 1392

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
4 CHECK FUEL PRESSURE.
WARNING:
¼ Place "NO FIRE" signs near the working
area.
¼ Be careful not to spill fuel on the floor.
1) Release fuel pressure.
(1) Disconnect connector from fuel pump
relay.
(2) Start the engine and run it until it stalls.
(3) After the engine stalls, crank it for five
more seconds.
(4) Turn ignition switch to OFF.
2) Connect connector to fuel pump relay.
3) Disconnect fuel delivery hose from fuel
filter, and connect fuel pressure gauge.
4) Install fuel filler cap.
5) Start the engine and idle while gear posi-
tion is neutral.
6) Measure fuel pressure while disconnecting
pressure regulator vacuum hose from intake
manifold.
WARNING:
Before removing fuel pressure gauge,
release fuel pressure.
NOTE:
If fuel pressure does not increase, squeeze
fuel return hose 2 to 3 times, then measure
fuel pressure again.
5 CHECK FUEL PRESSURE.
After connecting pressure regulator vacuum
hose, measure fuel pressure.
WARNING:
Before removing fuel pressure gauge,
release fuel pressure.
NOTE:
¼ If fuel pressure does not increase, squeeze
fuel return hose 2 to 3 times, then measure
fuel pressure again.
¼ If out of specification as measured at this
step, check or replace pressure regulator and
pressure regulator vacuum hose.
6 CHECK FUEL INJECTOR.
1) Turn ignition switch to OFF.
2) Remove right bank fuel injector. <Ref. to
FU(H6)-39, REMOVAL, Fuel Injector.>
3) Check fuel injector
7 CHECK FUEL INJECTOR.
Measure resistance between terminals of fuel
injector.
Terminals
No. 1 — No. 2
Step
Is fuel pressure between
284 and 314 kPa (2.9 and
3.2 kg/cm
psi)?
Is fuel pressure between
206 and 235 kPa (2.1 and
2.4 kg/cm
psi)?
Is fuel injector clogged?
Is the resistance between 5
and 20 Ω?
EN(H6)-185
Check Yes
Go to step 5.
2
, 41 and 46
Go to step 6.
2
, 30 and 34
Replace fuel
injector. <Ref. to
FU(H6)-39, Fuel
Injector.>
Go to step 8.
Engine (DIAGNOSTICS)
No
Repair the follow-
ing items.
Fuel pressure
too high
¼ Clogged fuel
return line or bent
hose
Fuel pressure
too low
¼ Improper fuel
pump discharge
¼ Clogged fuel
supply line
Repair the follow-
ing items.
Fuel pressure
too high
¼ Faulty pressure
regulator
¼ Clogged fuel
return line or bent
hose
Fuel pressure
too low
¼ Faulty pressure
regulator
¼ Improper fuel
pump discharge
¼ Clogged fuel
supply line
Go to step 7.
Replace fuel
injector. <Ref. to
FU(H6)-39, Fuel
Injector.>