Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 26

FU(STI)-16

Throttle Body

FUEL INJECTION (FUEL SYSTEMS)

6) Measure the voltage between ECM connector

terminals.

7) After inspection, install the related parts in the

reverse order of removal.
Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

2. THROTTLE SENSOR INSPECTION

(METHOD WITH SUBARU SELECT MONI-

TOR)

1) Turn the ignition switch to ON. (engine OFF)

2) Read the throttle opening angle signal and volt-

age of throttle sensor using Subaru Select Monitor.

<Ref. to EN(H4DOTC)(diag)-41, READ CURRENT

DATA FOR ENGINE (NORMAL MODE), OPERA-

TION, Subaru Select Monitor.>

3. OTHER INSPECTIONS

1) Check that the throttle body has no deformation,

cracks or other damages.

2) Check that the engine coolant hose has no

cracks, damage or loose part.

(A) To ECM connector

Throttle

sensor

Accelerator

pedal

Terminal No.

Standard

Main

Not
depressed
(Full closed)

18 (+) and 29 (–)

Approx. 0.6 V

Depressed
(Full opened)

Approx. 3.96 V

Sub

Not
depressed
(Full closed)

28 (+) and 29 (–)

Approx. 1.48 V

Depressed
(Full opened)

Approx. 4.17 V

Throttle sensor

Throttle opening

angle signal

Standard

Main

0.0%

Approx. 0.6 V

100.0%

Approx. 3.96 V

Sub

0.0%

Approx. 1.48 V

100.0%

Approx. 4.17 V

FU-04049

5

6

7

8

2

1

9

4

3

10

24

22

23

25

11

12

13

14

15

26

27

28

16

17

18

19

20

21

33

34

29

32

30

31

V

(A)

FU(STI)-17

Intake Manifold

FUEL INJECTION (FUEL SYSTEMS)

3. Intake Manifold

A: REMOVAL

1) Remove the V-belt covers.

2) Collect the refrigerant from A/C system. <Ref. to

AC-19, PROCEDURE, Refrigerant Recovery Pro-

cedure.>

3) Release the fuel pressure. <Ref. to FU(STI)-67,

RELEASING OF FUEL PRESSURE, PROCE-

DURE, Fuel.>

4) Disconnect the ground cable from battery.

5) Open the fuel filler lid and remove the fuel filler

cap.

6) Lift up the vehicle.

7) Remove the under cover. <Ref. to EI-28, RE-

MOVAL, Front Under Cover.>

8) Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt)

of coolant. <Ref. to CO(STI)-13, DRAINING OF

ENGINE COOLANT, REPLACEMENT, Engine

Coolant.>

9) Remove the air intake duct. <Ref. to IN(STI)-10,

REMOVAL, Air Intake Duct.>

10) Remove the air intake boot.

11) Remove the intercooler. <Ref. to IN(STI)-12,

REMOVAL, Intercooler.>

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

REMOVAL, Generator.>

13) Remove the coolant filler tank. <Ref. to

CO(STI)-28, REMOVAL, Coolant Filler Tank.>

14) Disconnect the A/C pressure hoses from A/C

compressor. <Ref. to AC-41, REMOVAL, Hose and

Pipe.>

15) Disconnect the engine coolant hose from throt-

tle body.

16) Disconnect the brake booster vacuum hose (A)

and pressure regulator vacuum hose (B) from the

intake manifold.

17) Disconnect the connector from the PCV hose

assembly A.

FU-03487

IN-00203

LU-02413

FU-05761

ME-05007

E N G

(A)

(B)

FU-06567

FU(STI)-18

Intake Manifold

FUEL INJECTION (FUEL SYSTEMS)

18) Remove the PCV hose assembly A from clip

(A), and remove the vacuum hose from clip (B).

19) Disconnect the vacuum hose (A) and the con-

nector (B) from the PCV hose assembly B.

20) Disconnect the air control hose (A) from the

waste gate actuator, and loosen the clamp which

holds the intake duct to the turbocharger.

21) Remove the engine coolant hose from the wa-

ter tank pipe.

22) Remove the engine harness from clip (A).

23) Disconnect the bulkhead harness connectors

from the engine harness connectors.

24) Remove the engine harness connector from

the engine harness bracket.

25) Disconnect the connector (A) from the engine

coolant temperature sensor, connector (B) from the

oil pressure switch, and connector (C) from the

crankshaft position sensor.

FU-06568

(A)

(B)

(A)

(B)

FU-06566

FU-04384

(A)

FU-06569

FU-06570

(A)

FU-06571

FU-06572

(C)

(A)

(B)

FU-05725

FU(STI)-19

Intake Manifold

FUEL INJECTION (FUEL SYSTEMS)

26) Disconnect the connector from power steering

pump switch.

27) Disconnect the connector from the knock sen-

sor.

28) Disconnect the connector from the secondary

air combination valve.

29) Disconnect the connector from the intake cam-

shaft position sensor.

30) Disconnect the connector from the intake oil

flow control solenoid valve.

31) Lift up the vehicle.

FU-04598

FU-03492

FU-03493

FU-04385

FU-03495