Toyota Sequoia (2005). Manual - part 685

B17519

Air Switching Valve

Pressure Sensor

Air Pump

Bracket

5.0 (55, 48 in.·lbf)

16 (163, 12)

N·m (kgf·cm, ft·lbf) : Specified torque

–

EMISSION CONTROL

SECONDARY AIR INJECTION SYSTEM

EC–21

2729

EC0O0–01

B17520

B17521

B17522

B17523

B17524

EC–22

–

EMISSION CONTROL

SECONDARY AIR INJECTION SYSTEM

2730

REMOVAL

1.

REMOVE THROTTLE BODY COVER

2.

REMOVE INTAKE MANIFOLD (See page 

EM–36

)

3.

REMOVE VSV FOR AIR INJECTION SYSTEM

(a)

Remove the 2 bolts and 2 VSVs from the intake manifold.

(b)

Remove the 2 vacuum hoses from the 2 VSVs.

4.

REMOVE AIR PUMP ASSEMBLY

(a)

Disconnect the air hose No.2 from the air switching valve.

(b)

Disconnect the air switching valve connector.

(c)

Disconnect the pressure sensor connector for the air in-
jection system.

(d)

Remove the 4 bolts and air pump assembly.

5.

REMOVE NO. 2 AIR SWITCHING VALVE

(a)

Remove the 4 nuts and 2 gaskets, and disconnect the 2
No.3 air tubes from the exhaust manifolds.

(b)

Remove the 4 bolts, 2 gaskets and the 2 No.3 air tubes
from the 2 No.2 air switching valves.

(c)

Remove the 4 bolts, 2 gaskets and the 2 No.2 air switch-
ing valves from the rear water by–pass joint.

(d)

Remove the 2 vacuum hoses from the No.2 air switching
valves.

6.

REMOVE AIR INJECTION CONTROL DRIVER

(a)

Disconnect the 2 connectors from the air injection control
driver.

(b)

Remove the 2 bolts and air injection control driver from
the body.

EC0O1–01

B17525

B17526

–

EMISSION CONTROL

SECONDARY AIR INJECTION SYSTEM

EC–23

2731

DISASSEMBLY

1.

REMOVE PRESSURE SENSOR

(a)

Remove the vacuum hose from the pressure sensor and
air switching valve.

(b)

Remove the 2 bolts and pressure sensor from the air
switching valve.

2.

REMOVE AIR SWITCHING VALVE

(a)

Remove the 2 bolts and air switching valve from the air
pump bracket.

(b)

Remove the No.1 air hose from the air switching valve
and air pump.

EC0O2–01

B17527

B17528

Port A

Port B

Air

B17529

Port A

Port B

Battery

Air

B17530

Port C

Port B

Port A

Air

B17531

Port C

Port B

Port A

Air

EC–24

–

EMISSION CONTROL

SECONDARY AIR INJECTION SYSTEM

2732

INSPECTION

1.

INSPECT AIR PUMP

(a)

Connect the positive (+) lead from the battery to terminal
1 and negative (–) lead to terminal 2, and check that air
flows.

If operation is not as specified, replace the air pump.

2.

INSPECT AIR SWITCHING VALVE

(a)

Blow air into port A and check that air is not discharged
from port B.

(b)

Apply positive battery between the terminals.

(c)

Blow air into port A and check that air is discharged from
port B.

If operation is not as specified, replace the air switching valve.

3.

INSPECT NO. 2 AIR SWITCHING VALVE

(a)

Blow air into port B and check that air is not discharged
from port C.

(b)

Apply vacuum (30 kPa (306 gf/cm

2

, 4.35 psi) to port A,

blow air into port B and check that air is discharged from
port C.

If operation is not as specified, replace the No.2 air switching
valve.