Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 51

EC(STI)-18

Shut Valve

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

10.Shut Valve

A: REMOVAL

WARNING:

Place “NO OPEN FLAMES” signs near the

working area.
CAUTION:

Be careful not to spill fuel.

1) Remove the fuel filler pipe. <Ref. to FU(STI)-77,

REMOVAL, Fuel Filler Pipe.>

2) Disconnect the evaporation hose from the shut

valve.

3) Remove the shut valve from the fuel filler pipe.

B: INSTALLATION

Install in the reverse order of removal.
Tightening torque:

4.5 N·m (0.5 kgf-m, 3.3 ft-lb)

C: INSPECTION

1) Check that the shut valve has no deformation,

cracks or other damages.

2) Check that the evaporation hose has no cracks,

damage or loose part.

EC-02753

EC-02481

EC(STI)-19

Leak Check Valve Assembly

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

11.Leak Check Valve Assembly

A: REMOVAL

Refer to “Canister” for removal procedures. <Ref.

to EC(STI)-7, REMOVAL, Canister.>

B: INSTALLATION

Refer to “Canister” for installation procedures.

<Ref. to EC(STI)-9, INSTALLATION, Canister.>

C: DISASSEMBLY

Disconnect the drain tube from the leak check

valve assembly.
NOTE:

Disconnect the quick connector as shown in the fig-

ure.

(a) Retainer

EC-02281

(a)

(a)

(a)

EC-02988

EC(STI)-20

Leak Check Valve Assembly

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

D: ASSEMBLY

Assemble the parts in the reverse order of disas-

sembly while being careful of the following.

• Connect the quick connector as shown in the fig-

ure.
CAUTION:

• Check that there is no damage or dust on the

quick connector. If necessary, clean the seal

surface of the pipe.

• When connecting the quick connector, se-

curely insert the pipe all the way before locking

the retainer.

• When it is difficult to lock the retainer, make

sure that the pipe is securely inserted.

• Make sure that the quick connector is secure-

ly connected.

E: INSPECTION

1. CHECK SWITCHING VALVE

1) Check the resistance between switching valve

terminals.

2) Disconnect the drain tube from the leak check

valve assembly.

(a) Retainer

EC-02295

(a)

(a)

(a)

Terminal No.

Standard

1 and 5

27

+3

–2

Ω (when 20°C (68°F))

31±4 Ω (when 60°C (140°F))

EC-02989

4 3

1

8 7 6 5

2

EC-02990

EC(STI)-21

Leak Check Valve Assembly

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

3) Check that air is discharged from (B) when air is

blown into (A).

4) Connect the battery positive terminal to the ter-

minal No. 5 and the battery negative terminal to the

terminal No. 1. Check that air does not come out

from (B) when air is blown into (A).

2. CHECK VACUUM PUMP

1) Connect the battery positive terminal to terminal

No. 3 and the battery ground terminal to terminal

No. 4, and inspect the vacuum pump operation.
CAUTION:

Do not operate the vacuum pump for 5 minutes

or more.

3. CHECK PRESSURE SENSOR

1) Connect dry-cell battery positive terminal to ter-

minal No. 6 and dry-cell battery ground terminal to

terminal No. 8, circuit tester positive terminal to ter-

minal No. 7 and the circuit tester negative terminal

to terminal No. 8.
NOTE:

• Use new dry-cell batteries.

• Using circuit tester, check the voltage of a single

dry-cell battery is 1.6 V or more. And also check the

voltage of three batteries in series is between 4.8 V

and 5.2 V.

EC-03405

(A)

(B)

EC-03406

(A)

(B)

4 3

1

8 7 6 5

2

EC-02993

4 3

1

8 7 6 5

2

EC-02994

4.8 5.2V

1.5V

1.5V

1.5V

4 3

1

8 7 6 5

2

V