Page 2737 of 4323
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 CONTROLSECONDARY AIR INJECTION SYSTEM
EC±21
2729 Author: Date:
2005 SEQUOIA (RM1146U)
Page 2738 of 4323

EC0O0±01
B17520
B17521
B17522
B17523
B17524
EC±22
± EMISSION CONTROLSECONDARY AIR INJECTION SYSTEM
2730 Author: Date:
2005 SEQUOIA (RM1146U)
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.
Page 2739 of 4323
EC0O1±01
B17525
B17526
± EMISSION CONTROLSECONDARY AIR INJECTION SYSTEM
EC±23
2731 Author: Date:
2005 SEQUOIA (RM1146U)
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.
Page 2740 of 4323

EC0O2±01
B17527
B17528
Port APort B
Air
B17529
Port APort B
Battery Air
B17530
Port C
Port B Port A
Air
B17531
Port C
Port BPort A
Air
EC±24
± EMISSION CONTROLSECONDARY AIR INJECTION SYSTEM
2732 Author: Date:
2005 SEQUOIA (RM1146U)
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.
Page 2741 of 4323
EC0O3±01
B17526
B17525
± EMISSION CONTROLSECONDARY AIR INJECTION SYSTEM
EC±25
2733 Author: Date:
2005 SEQUOIA (RM1146U)
REASSEMBLY
1. INSTALL AIR SWITCHING VALVE
(a) Install the No.1 air hose to the air switching valve and air
pump.
(b) Install the air switching valve with the 2 bolts to the air
pump bracket.
Torque: 16 N´m (163 kgf´cm, 12 ft´lbf)
2. INSTALL PRESSURE SENSOR
(a) Install the pressure sensor with the 2 bolts to the air
switching valve.
Torque: 5.0 N´m (55 kgf´cm, 48 in.´lbf)
(b) Install the vacuum hose to the pressure sensor and air
switching valve.
Page 2742 of 4323

EC0O4±01
B17524
B17523
B17522
B17521
B17520
EC±26
± EMISSION CONTROLSECONDARY AIR INJECTION SYSTEM
2734 Author: Date:
2005 SEQUOIA (RM1146U)
INSTALLATION
1. INSTALL AIR INJECTION CONTROL DRIVER
(a) Install the air injection control driver with the 2 bolts to the
body.
Torque: 18 N´m (184 kgf´cm, 13 ft´lbf)
(b) Connect the 2 connectors to the air injection control driv-
er.
2. INSTALL NO. 2 AIR SWITCHING VALVE
(a) Connect the 2 vacuum hoses to the No.2 air switching
valves.
(b) Install 2 new gaskets and 2 No.2 air switching valves with
the 4 bolts to the rear water by±pass joint.
Torque: 10 N´m (102 kgf´cm, 7 ft´lbf)
(c) Install 2 new gaskets, and connect the 2 No.3 air tubes
with the 4 bolts to the No.2 air switching valve.
Torque: 10 N´m (102 kgf´cm, 7 ft´lbf)
(d) Install the 2 new gaskets, and connect the 2 No.3 air
tubes with the 4 nuts to the exhaust manifold.
Torque: 10 N´m (102 kgf´cm, 7 ft´lbf)
3. INSTALL AIR PUMP ASSEMBLY
(a) Install the air pump assembly with the 4 bolts.
Torque: 16 N´m (163 kgf´cm, 12 ft´lbf)
(b) Connect the pressure sensor connector for the air injec-
tion system.
(c) Connect the air switching valve connector.
(d) Connect the air hose No.2 to the air switching valve.
4. INSTALL VSV FOR AIR INJECTION SYSTEM
(a) Install the 2 VSVs with the 2 bolts to the intake manifold.
Torque: 7.5 N´m (76 kgf´cm, 66 in.´lbf)
(b) Connect the 2 vacuum hoses to the 2 VSVs.
5. INSTALL INTAKE MANIFOLD (See page EM±60)
6. INSTALL THROTTLE BODY COVER
Page 2743 of 4323

SF1XD±01
± SFISFI SYSTEM
SF±1
2735 Author: Date:
2005 SEQUOIA (RM1146U)
SFI SYSTEM
PRECAUTION
HINT:
All DTCs retained in the ECM will be erased when the negative
(±) terminal cable is removed from the battery.
If necessary, read the DTC before removing the negative (±)
terminal cable from the battery.
1. BEFORE WORKING ON FUEL SYSTEM,
DISCON-
NECT CABLE FROM NEGATIVE (±) BATTERY TERMI-
NAL
2. DO NOT SMOKE OR WORK NEAR AN OPEN FLAME
WHEN WORKING ON FUEL SYSTEM
3. KEEP GASOLINE AWAY FROM RUBBER OR
LEATH-
ER PARTS
4. MAINTENANCE PRECAUTIONS
(a) To prevent engine misfire, these precautions should be
taken.
(1) Check the battery terminals are proper connected.
(2) After repair, check that the ignition coil terminals
and all other ignition system lines are reconnected
securely.
(3) When cleaning the engine compartment, be espe-
cially careful to protect the electrical system from
water.
(b) Observe the following when handling the air fuel ratio
sensors and oxygen sensor.
(1) Do not drop the sensor or hit it against another ob-
ject.
(2) The sensor should be free from any contact with wa-
ter.
5. IF VEHICLE IS EQUIPPED WITH MOBILE RA-
DIO
SYSTEM (HAM, CB, ETC.)
If the vehicle is equipped with a mobile communication system,
refer to the precaution in the IN section.
6. AIR INDUCTION SYSTEM
(a) Removal of the engine oil dipstick, oil filler cap, PCV hose,
may break the engine.
(b) Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder
head may result in air suction and break the engine.
7. ELECTRONIC CONTROL SYSTEM
(a) Before removing SFI wiring connectors, terminals, first
disconnect the power by turning the ignition switch off or
disconnecting the negative (±) terminal cable from the
battery.
HINT:
Be sure to check DTCs before disconnecting the negative (±)
terminal cable from the battery.
Page 2744 of 4323

FI2553
SST
B16498
New Gasket
SF±2
± SFISFI SYSTEM
2736 Author: Date:
2005 SEQUOIA (RM1146U)
(b) When installing the battery, be especially careful to cor-
rectly connect the positive (+) and negative (±) cables.
(c) Do not give a severe impact to the SFI parts during remov-
al or installation. Handle all SFI parts carefully, especially
the ECM.
(d) Be careful during troubleshooting. Numerous transistor
circuits are used and even slight terminal contact can
cause further trouble.
(e) Do not open the ECM cover.
(f) When inspecting during rainy weather, take care to pre-
vent entry of water. Also, when washing the engine
compartment, prevent water from getting into the SFI
parts and wiring connectors.
(g) Parts should be replaced as an assembly.
(h) Care should be taken when pulling out and inserting wir-
ing connectors.
(1) Release the lock and pull out the connector, pulling
on the connectors.
(2) Fully insert the connector and check that it is locked.
(i) Use SST for inspection or test of the injector or its wiring
connector.
SST 09842±30070
8. FUEL SYSTEM
(a) When disconnecting the high fuel pressure line, a large
amount of gasoline will spill out. Observe the following
procedures:
(1) Disconnect the circuit opening relay.
(2) Start the engine. After the engine has stopped on
its own, turn the ignition switch off.
(3) Put a container under the connecting part of the
pressure line.
(4) Slowly loosen the connection.
(5) Disconnect the high fuel pressure line.
(6) Reconnect the fuel pump connector.
(b) When connecting the union bolt (fuel pressure pulsation
damper) on the high pressure pipe union, observe the fol-
lowing procedures:
(1) Always use 2 new gaskets.
(2) Tighten the union bolt by hand.