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
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.
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