Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 149

EC(w/o STI)-29

Secondary Air Pump

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

15.Secondary Air Pump

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the clip (A) which holds the harness on

the harness stay and remove the bolt (B) which

holds the secondary air pump on the vehicle.

3) Disconnect the connector (A) and air duct (B)

from secondary air pump and remove the second-

ary air pump.

B: INSTALLATION

Install in the reverse order of removal.
Tightening torque:

19 N·m (1.9 kgf-m, 14.0 ft-lb)

C: INSPECTION

1. SECONDARY AIR PUMP

1) Check that the secondary air pump has no defor-

mation, cracks or other damages.

2) Connect battery positive terminal to the terminal

No. 2 and battery negative terminal to the terminal

No. 1, and inspect the secondary air pump opera-

tion.
CAUTION:

Do not operate the secondary air pump contin-

uously for 80 seconds or more.

2. OTHER INSPECTIONS

Check that the air duct has no cracks, damage or

loose part.

IN-00203

EC-02691

(B)

(A)

EC-02743

(A)

(B)

EC-02427

2 1

EC(w/o STI)-30

Secondary Air Combination Valve

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

16.Secondary Air Combination

Valve

A: REMOVAL

1. SECONDARY AIR COMBINATION

VALVE LH

1) Disconnect the ground cable from battery.

2) Remove the intercooler. <Ref. to IN(w/o STI)-12,

REMOVAL, Intercooler.>

3) Disconnect the connector from the secondary air

combination valve LH.

4) Disconnect the air duct A.

5) Remove the secondary air pipe LH.

6) Remove the secondary air combination valve

LH.

2. SECONDARY AIR COMBINATION

VALVE RH

1) Disconnect the ground cable from battery.

2) Remove the intercooler. <Ref. to IN(w/o STI)-12,

REMOVAL, Intercooler.>

3) Remove the intake manifold. <Ref. to FU(w/o

STI)-18, REMOVAL, Intake Manifold.>

4) Disconnect the air duct A.

5) Disconnect the secondary air pipe RH.

6) Remove the secondary air combination valve

RH.

(A) Secondary air combination valve LH
(B) Clip

(C) Air duct A
(D) Gasket

(E) Air duct B

(F) Secondary air pipe LH

(G) Gasket

IN-00203

EC-02737

(A)

(D)

(F)

(B)

(B)

(E)

(G)

(C)

A

A

B

B

(A) Secondary air combination valve RH
(B) Clip

(C) Air duct A
(D) Gasket

(E) Secondary air pipe RH

(F) Gasket

IN-00203

EC-02685

(B)

(C)

(E)

(F)

(D)

(A)

EC(w/o STI)-31

Secondary Air Combination Valve

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

B: INSTALLATION

1. SECONDARY AIR COMBINATION

VALVE LH

Install in the reverse order of removal.
NOTE:

Use a new gasket.
Tightening torque:

T1: 6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

T2: 9 N·m (0.9 kgf-m, 6.6 ft-lb)

T3: 19 N·m (1.9 kgf-m, 14.0 ft-lb)

2. SECONDARY AIR COMBINATION

VALVE RH

Install in the reverse order of removal.
NOTE:

Use a new gasket.
Tightening torque:

9 N·m (0.9 kgf-m, 6.6 ft-lb)

(A) Secondary air combination valve LH
(B) Clip

(C) Air duct A
(D) Gasket

(E) Air duct B

(F) Secondary air pipe LH

(G) Gasket

EC-02738

(A)

(D)

(F)

(B)

(B)

(E)

(G)

(C)

T1

T3

T2

A

A

B

B

(A) Secondary air combination valve RH
(B) Clip

(C) Air duct A
(D) Gasket

(E) Secondary air pipe RH

(F) Gasket

EC-02686

(B)

(C)

(E)

(F)

(D)

(A)

EC(w/o STI)-32

Secondary Air Combination Valve

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

C: INSPECTION

1. SECONDARY AIR COMBINATION

VALVE LH

1) Check that the secondary air combination valve

LH has no deformation, cracks or other damages.

2) Check the resistance between the terminals of

secondary air combination valve LH.

3) Check that air does not come out from (B) when

air is blown into (A).

4) Connect the battery positive terminal to the ter-

minal No. 2 and the battery negative terminal to the

terminal No. 1. Check that air is discharged from

(B), when supplying air to (A).

2. SECONDARY AIR COMBINATION

VALVE RH

1) Check that the secondary air combination valve

RH has no deformation, cracks or other damages.

2) Check the resistance between the terminals of

secondary air combination valve RH.

Terminal No.

Standard

1 and 2

5.0±0.5 Ω

(when 20°C (68°F))

2 1

EC-02428

EC-02434

(A)

(B)

Terminal No.

Standard

4 and 6

5.0±0.5 Ω

(when 20°C (68°F))

2 and 3

15 kΩ or less

1 and 2

4.5 kΩ or less

EC-02435

2 1

(A)

(B)

EC-02429

3

1

6 5 4

2