Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 147

EC(w/o STI)-21

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(w/o STI)-22

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

EC(w/o STI)-23

Leak Check Valve Assembly

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

2) Check the voltage at a normal atmospheric pres-

sure.
NOTE:

The atmospheric pressure at higher altitude is low-

er than normal. Therefore, the voltage is lower than

the standard value.

3) Connect the battery positive terminal to terminal

No. 3 and the battery ground terminal to terminal

No. 4, and check that there is a voltage drop from

the voltage measured in step 2) when the vacuum

pump is operated.

4. OTHER INSPECTIONS

Check that the drain tube has no cracks, damage

or loose part.

Terminal No.

Standard

7 (+) and 8 (–)

Approx. 3.5 V

(when 25°C (77°F))

EC-02995

4.8 5.2V

1.5V

1.5V

1.5V

4 3

1

8 7 6 5

2

V

EC(w/o STI)-24

Drain Separator

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

12.Drain Separator

A: REMOVAL

1) Lift up the vehicle.

2) Remove the rear differential. <Ref. to DI-22, RE-

MOVAL, Rear Differential (T-type).>

3) Disconnect the drain hose from the connector.

4) Remove the drain separator from the vehicle.

B: INSTALLATION

Install in the reverse order of removal.
Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

C: DISASSEMBLY

1) Remove the drain hose from the drain separator.

2) Lift up the claw (A) of the drain separator and

slide the drain separator in the direction of the ar-

row to remove the drain separator.

D: ASSEMBLY

Assemble in the reverse order of disassembly.

E: INSPECTION

1) Check that the drain separator and drain separa-

tor bracket have no deformation, crack, or other

damage.

2) Check that the drain hose has no crack, dam-

age, or looseness.

3) Check that no foreign substances are clogged in

the drain separator.

EC-02715

EC-03163

EC-03164

EC-03165

(A)