Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 30

FU(STI)-32

Intake Manifold

FUEL INJECTION (FUEL SYSTEMS)

19) Install purge control solenoid valve 1 and purge

control solenoid valve 2.
NOTE:

Connect  the  vacuum  hose  and  vacuum  control

hose as shown in the figure.

Tightening torque:

T1: 6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

T2: 16 N·m (1.6 kgf-m, 11.8 ft-lb)

20) Attach the connector to the PCV hose assem-

bly.

21) Install the connector to the intake duct.

22) Install the fuel pipe protector LH.
Tightening torque:

19 N·m (1.9 kgf-m, 14.0 ft-lb)

23) Install  the  fuel  pipe  protector  RH,  and  secure

the  engine  harness  to  the  fuel  pipe  protector  RH

using the clip (A).
Tightening torque:

19 N·m (1.9 kgf-m, 14.0 ft-lb)

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

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

(c) To branching pipe → fuel pipe

(c)

(b)

(a)

(B)

(A)

(c)

FU-04417

FU-06582

T2

T1

FU-06576

FU-05921

FU-06591

FU-06575

(A)

FU(STI)-33

Intake Manifold

FUEL INJECTION (FUEL SYSTEMS)

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.

FU(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(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

(A)

FU-05796

(A) Thermometer
(B) Engine coolant temperature sensor

(C) Hexagonal part height: To approx.

1

/

3

Water tempera-

ture

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

FU(STI)-35

Crankshaft Position Sensor

FUEL INJECTION (FUEL SYSTEMS)

5. Crankshaft Position Sensor

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the bolt which secures crankshaft posi-

tion sensor to oil pump.

3) Remove the crankshaft position sensor, and dis-

connect the connector from the crankshaft position

sensor.

B: INSTALLATION

Install in the reverse order of removal.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

C: INSPECTION

1. CRANKSHAFT POSITION SENSOR 

(METHOD WITH CIRCUIT TESTER)

Measure the resistance between crankshaft posi-

tion sensor terminals.

2. CRANKSHAFT POSITION SENSOR 

(METHOD WITH OSCILLOSCOPE)

1) Prepare an oscilloscope.

2) Remove  the  lower  inner  trim  of  passenger’s

side.  <Ref.  to  EI-57,  REMOVAL,  Lower  Inner

Trim.>

3) Turn over the floor mat of passenger’s seat.

4) Remove the protect cover.

5) Remove the nuts and bolts which hold the ECM

to the bracket.

IN-00203

FU-05818

FU-05348

Terminal No.

Standard

1 and 2

2.04±0.204 kΩ

2 1

EC-02428

FU-03416

FU-03417