Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 33
FU(STI)-44
Manifold Absolute Pressure Sensor
FUEL INJECTION (FUEL SYSTEMS)
4) Connect the Mighty Vac to the pressure port (A)
of manifold absolute pressure sensor.
5) Check the voltage when generating vacuum and
positive pressure using Mighty Vac.
CAUTION:
Do not apply vacuum of less than –88 — 200
kPa (–0.9 — 2.04 kgf/cm
2
, –12.8 — 29.0 psi). Do-
ing so may damage the manifold absolute pres-
sure sensor.
NOTE:
When vacuum occurs at the pressure port of man-
ifold absolute pressure sensor, the voltage will drop
from the value as in step 3). When positive pres-
sure occurs, on the other hand, the voltage will rise.
Pressure
Terminal No.
Standard
–88 kPa (–0.9 kgf/cm
2
,
–12.8 psi)
1 (+) and 2 (–)
Approx. 0.8 V
(when 25°C
(77°F))
181 kPa (1.85 kgf/cm
2
,
26.2 psi)
Approx. 4.7 V
(when 25°C
(77°F))
FU-04492
(A)
FU(STI)-45
Fuel Injector
FUEL INJECTION (FUEL SYSTEMS)
11.Fuel Injector
A: REMOVAL
1. RH SIDE
1) Release the fuel pressure. <Ref. to FU(STI)-67,
RELEASING OF FUEL PRESSURE, PROCE-
2) Disconnect the ground cable from battery.
3) Open the fuel filler lid and remove the fuel filler
cap.
4) Remove the intake manifold. <Ref. to FU(STI)-
17, REMOVAL, Intake Manifold.>
5) Remove clip (A) holding the engine harness to
the fuel pipe protector RH, and remove the fuel
pipe protector RH from the intake manifold.
6) Remove the harness band (A) which holds the
engine harness to the fuel injector pipe RH.
7) Disconnect the connector from fuel injector.
8) Remove the bolts which hold fuel injector pipe
RH.
9) Remove the fuel injector.
IN-00203
FU-06575
(A)
FU-05919
(A)
FU-03568
FU-03512
FU-03513
FU(STI)-46
Fuel Injector
FUEL INJECTION (FUEL SYSTEMS)
2. LH SIDE
1) Release the fuel pressure. <Ref. to FU(STI)-67,
RELEASING OF FUEL PRESSURE, PROCE-
2) Disconnect the ground cable from battery.
3) Open the fuel filler lid and remove the fuel filler
cap.
4) Remove the intake manifold. <Ref. to FU(STI)-
17, REMOVAL, Intake Manifold.>
5) Remove the fuel pipe protector LH from the in-
take manifold.
6) Remove the harness band (A) which holds the
engine harness to the fuel injector pipe LH.
7) Disconnect the connector from fuel injector.
8) Remove the bolts which hold fuel injector pipe
LH.
9) Remove the fuel injector.
IN-00203
FU-06591
FU-05920
(A)
FU-03508
FU-03594
FU-03595
FU-03527
FU(STI)-47
Fuel Injector
FUEL INJECTION (FUEL SYSTEMS)
B: INSTALLATION
1. RH SIDE
Install in the reverse order of removal.
NOTE:
Use new O-rings.
Tightening torque:
19 N·m (1.9 kgf-m, 14.0 ft-lb)
2. LH SIDE
Install in the reverse order of removal.
NOTE:
Use new O-rings.
Tightening torque:
6.4 N·m (0.7 kgf-m, 4.7 ft-lb)
Tightening torque:
19 N·m (1.9 kgf-m, 14.0 ft-lb)
C: INSPECTION
1) Check that the fuel injector has no deformation,
cracks or other damages.
2) Measure the resistance between fuel injector
terminals.
FU-03512
FU-06583
FU-03594
Terminal No.
Standard
1 and 2
Approx. 12.0 Ω
(when 20°C (68°F))
FU-03595
FU-06584
2 1
EC-02428
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