Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 126

FU(w/o STI)-31

Intake Manifold

FUEL INJECTION (FUEL SYSTEMS)

9) Secure the fuel injector pipe LH to intake mani-

fold with bolt, and connect the pressure regulator

vacuum hose to the intake manifold.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

10) Install the PCV pipe (A), harness assembly (B),

intake  duct  (C),  brake  booster  vacuum  hose  (D)

and vacuum hose (E) to the intake manifold.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

11) Connect the connector to the fuel injector and

the tumble generator valve assembly.

• RH side

• LH side

12) Install the throttle body to the intake manifold.
NOTE:

Use new O-rings.
Tightening torque:

8 N·m (0.8 kgf-m, 5.9 ft-lb)

13) Connect the connector  to the throttle position

sensor.

FU-06544

FU-06543

(C)

(A)

(D)

(E)

(B)

FU-06541

FU-06542

FU-05674

FU-05673

FU(w/o STI)-32

Intake Manifold

FUEL INJECTION (FUEL SYSTEMS)

14) Connect  the  vacuum  hose  to  the  intake  duct

and the fuel pipe, then connect the connector to the

purge control solenoid valve 2.
NOTE:

Connect the vacuum hose as shown in the figure.

15) Install the solenoid valve bracket assembly to

the intake manifold, and connect the connector to

the wastegate control solenoid valve and the man-

ifold absolute pressure sensor.
Tightening torque:

T1: 17 N·m (1.7 kgf-m, 12.5 ft-lb)

T2: 19 N·m (1.9 kgf-m, 14.0 ft-lb)

16) Connect the filter assembly.

17) Connect  the  vacuum  hose  and  the  connector

the fuel pipe, and install the purge control solenoid

valve 1 to the intake manifold.
NOTE:

Connect the vacuum hose as shown in the figure.

(A) Purge control solenoid valve 1
(B) Purge control solenoid valve 2

(a) To intake manifold
(b) To intake duct

(c) To fuel pipe

(A)

(B)

(b)

(c)

(c)

(a)

EC-02517

FU-05439

T1

T2

(A) Purge control solenoid valve 1
(B) Purge control solenoid valve 2

(a) To intake manifold
(b) To intake duct

(c) To fuel pipe

FU-05342

(A)

(B)

(b)

(c)

(c)

(a)

EC-02517

FU(w/o STI)-33

Intake Manifold

FUEL INJECTION (FUEL SYSTEMS)

Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

18) Connect the vacuum hose to the intake mani-

fold.
NOTE:

Connect the vacuum hose as shown in the figure.

19) Install the fuel pipe protector LH to the intake

manifold, and install the engine ground terminal to

the fuel pipe protector LH.
Tightening torque:

19 N·m (1.9 kgf-m, 14.0 ft-lb)

20) Install the fuel pipe protector RH to the intake

manifold.
Tightening torque:

19 N·m (1.9 kgf-m, 14.0 ft-lb)

E: INSPECTION

1) Check  that  the  intake  manifold  and  fuel  pipe

have no deformation, cracks and other damages.

2) Check that the hose has no cracks, damage or

loose part.

(A) Purge control solenoid valve 1
(B) Purge control solenoid valve 2

(a) To intake manifold
(b) To intake duct

(c) To fuel pipe

FU-05441

(A)

(B)

(b)

(c)

(c)

(a)

EC-02517

FU-05367

FU-06540

FU-06561

FU(w/o STI)-34

Engine Coolant Temperature Sensor

FUEL INJECTION (FUEL SYSTEMS)

4. Engine Coolant Temperature 

Sensor

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove  the  generator.  <Ref.  to  SC(STI)-21,

REMOVAL, Generator.>

3) Drain engine coolant. <Ref. to CO(w/o STI)-13,

DRAINING  OF  ENGINE  COOLANT,  REPLACE-

MENT, Engine Coolant.>

4) Disconnect  the  connector  (A)  from  the  engine

coolant  temperature  sensor,  and  remove  the  en-

gine coolant temperature sensor.

B: INSTALLATION

Install in the reverse order of removal.
NOTE:

Use a new gasket.
Tightening torque:

18 N·m (1.8 kgf-m, 13.3 ft-lb)

C: INSPECTION

1) Check that the engine coolant temperature sen-

sor has no deformation, cracks or other damages.

2) Immerse the engine coolant temperature sensor

and a thermometer in water.
CAUTION:

Take care not to allow water to get into the en-

gine  coolant  temperature  sensor  connector.

Completely remove any water inside.

3) Raise water temperature gradually, measure the

resistance  between  the  engine  coolant  tempera-

ture  sensor  terminals  when  the  temperature  is

20°C (68°F) and 80°C (176°F).
NOTE:

Agitate the water for even temperature distribution.

IN-00203

FU-05830

(A)

(A) Thermometer
(B) Engine coolant temperature sensor

(C) Hexagonal part height: to approx.

1

/

3

Water temperature

Terminal No.

Standard

20°C (68°F)

1 and 2

2.45±0.2 kΩ

80°C (176°F)

0.318±0.013 kΩ

FU-04053

(A)

(B)

(C)

2 1

EC-02428