Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 142

EMISSION CONTROL

(AUX. EMISSION CONTROL DEVICES)

EC(w/o STI)

Page

1.

General Description . . . . . . . . . . . . . . . . . . . . ...2

2.

Front Catalytic Converter . . . . . . . . . . . . . . . . . . ...5

3.

Rear Catalytic Converter . . . . . . . . . . . . . . . . . . . 6

4.

Canister . . . . . . . . . . . . . . . . . . . . . . . . . ..7

5.

Purge Control Solenoid Valve . . . . . . . . . . . . . . . . ..11

6.

Fuel Level Sensor . . . . . . . . . . . . . . . . . . . . . 15

7.

Fuel Sub Level Sensor . . . . . . . . . . . . . . . . . . . .16

8.

Pressure Control Solenoid Valve Assembly . . . . . . . . . . . .17

9.

Drain Filter . . . . . . . . . . . . . . . . . . . . . . . . 18

10.

Shut Valve . . . . . . . . . . . . . . . . . . . . . . . . 19

11.

Leak Check Valve Assembly . . . . . . . . . . . . . . . . . 20

12.

Drain Separator . . . . . . . . . . . . . . . . . . . . . . 24

13.

PCV Hose Assembly . . . . . . . . . . . . . . . . . . . . 25

14.

PCV Valve . . . . . . . . . . . . . . . . . . . . . . . . 27

15.

Secondary Air Pump . . . . . . . . . . . . . . . . . . . . 29

16.

Secondary Air Combination Valve . . . . . . . . . . . . . . ...30

EC(w/o STI)-2

General Description

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

1. General Description

A: COMPONENT

1. CANISTER, PURGE CONTROL SOLENOID VALVE, PRESSURE CONTROL SOLENOID

VALVE ASSEMBLY, SHUT VALVE, LEAK CHECK VALVE, AND DRAIN SEPARATOR

For components of canister, purge control solenoid valve, pressure control solenoid valve assembly, shut

valve, leak check valve, and drain separator, refer to FU (w/o STI). <Ref. to FU(w/o STI)-3, COMPONENT,

General Description.>

2. SECONDARY AIR PUMP

(1)

Secondary air pump

(4)

Secondary air pump cover

Tightening torque: N·m (kgf-m, ft-lb)

(2)

Clip

(5)

Harness stay

T1: 6.4 (0.7, 4.7)

(3)

Secondary air pump bracket

(6)

Secondary air pump harness

T2: 9 (0.9, 6.6)

T3: 19 (1.9, 14.0)

EC-02727

(1)

(3)

T2

T2

T2

T3

T1

(6)

(5)

(4)

(2)

EC(w/o STI)-3

General Description

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

3. SECONDARY AIR COMBINATION VALVE

(1)

Gasket

(7)

Air duct A

Tightening torque: N·m (kgf-m, ft-lb)

(2)

Gasket

(8)

Air duct B

T1: 6.4 (0.7, 4.7)

(3)

Gasket

(9)

Secondary air combination valve
LH

T2: 9 (0.9, 6.6)

(4)

Clip

(10) Secondary air pipe LH

T3: 19 (1.9, 14.0)

(5)

Secondary air pipe RH

(11) Gasket

(6)

Secondary air combination valve
RH

EC-02728

(3)

(1)

(2)

(6)

(4)

(4)

(4)

(4)

(9)

T3

T2

T2

T2

T1

(8)

(7)

(5)

T2

(10)

(11)

A

A

EC(w/o STI)-4

General Description

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

B: CAUTION

• Prior to starting work, pay special attention to the following:

1. Always wear work clothes, a work cap, and protective shoes. Additionally, wear a helmet, protective

goggles, etc. if necessary.
2. Protect the vehicle using a seat cover, fender cover, etc.
3. Prepare the service tools, clean cloth, containers to catch grease and oil, etc.

• Vehicle components are extremely hot immediately after driving. Be wary of receiving burns from heated

parts.

• When performing a repair, identify the cause of trouble and avoid unnecessary removal, disassembly and

replacement.

• Before disconnecting connectors of sensors or units, be sure to disconnect the ground cable from battery.

• Always use the jack-up point when the shop jacks or rigid racks are used to support the vehicle.

• Remove contamination including dirt and corrosion before removal, installation, disassembly or assembly.

• Keep the removed parts in order and protect them from dust and dirt.

• All removed parts, if to be reused, should be reinstalled in the original positions with attention to the correct

directions, etc.

• Bolts, nuts and washers should be replaced with new parts as required.

• Be sure to tighten the fasteners including bolts and nuts to the specified torque.

C: PREPARATION TOOL

1. SPECIAL TOOL

2. GENERAL TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

18353AA000

CLAMP PLIERS

• Used for removing and installing the PCV
hose.
• This tool is made by the French company
CAILLAU. (code) 54.0.000.205
To make it easier to obtain, it has been provided
with a tool number.

TOOL NAME

REMARKS

Circuit tester

Used for measuring resistance and voltage.

Mighty Vac

Used for inspecting the fuel tank pressure sensor.

ST18353AA000