2001 TOYOTA SEQUOIA O2 sensor

B17514
AIP
E2
EC0NY±01
B17665
B17515
12
B17516
Air
± EMISSION CONTROLSECONDARY AIR INJECTION SYSTEM
EC±17
2725 Author: Date:
2005 SEQUOIA (RM1146U)
SECONDARY AIR INJECTION
SYSTEM
ON±VEHICLE INSPECTION
1. INSPECT PRESSURE SENSOR
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage between terminals AIP and E2 of the
ECM connector.
Voltage: 1.0 to 2.2 V
If the voltage is not as specified, replace the pressure sensor.
2. INSPECT VSV FOR AIR INJECTION SYSTEM
(a) Disconnect the connector from the VSV.
(b) Disconnect the 2 vacuum hoses from the VSV.
(c) Using an ohmmeter, measure the resistance between the
terminals.
Standard:
Tester ConnectionSpecified Condition
1 ± 233 to 39 W at 20°C (68°F)
1 ± Body ground10 MW or higher
2 ± Body ground10 MW or higher
If the resistance is not as specified, replace the VSV.
(d) Check that air does not flow from the port as shown in the
illustration.
If the result is not as specified, replace the VSV.

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)

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.

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.

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.

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

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.

B17467
SF1XJ±01
D13872
Hand±Held Tester
DLC3
CAN VIM
± SFITHROTTLE BODY
SF±39
2773 Author: Date:
2005 SEQUOIA (RM1146U)
THROTTLE BODY
ON±VEHICLE INSPECTION
1. REMOVE THROTTLE BODY COVER
2. INSPECT SYSTEM OPERATION
(a) Inspect the throttle control motor for operating sound.
(1) Turn the ignition switch ON.
(2) When depressing the accelerator pedal, check the
running sound of the motor. Also, check that there
is no friction sound.
If operation is not as specified, check the throttle control motor
(see step 3), wiring and ECM.
(b) Inspect the accelerator pedal position sensor.
(1) Connect a hand±held tester to the Controller Area
Network Vehicle Interface Module (CAN VIM). Then
connect the CAN VIM to the Date Link Connector 3
(DLC3).
(2) Check that the MIL does not light up.
(3) When turning the accelerator pedal position sensor
lever to the full±open position, check that the
throttle valve opening percentage (THROTTLE
POS) of the CURRENT DATA showns the standard
value.
Standard throttle valve opening percentage:
60% or more
If operation is not as specified, check that the accelerator pedal
position sensor (see page DI±370), wiring and ECM.
If not using a hand±held tester, measure the voltage between
terminals (VTA1±E2, VTA2±E2) of the ECM connector (See
page DI±127).
(c) Inspect the idle speed.
(1) Start the engine and check that the MIL does not
light up.
(2) Allow the engine to warm up to normal operating
temperature.
(3) Turn the A/C compressor ON to OFF, and check the
idle speed.
Idle speed (Transmission in neutral): 700 ± 50 rpm
NOTICE:
Perform inspection without an electrical load.
(d) After checking the above (a) to (c), perform the driving test
and check that there is no sense of incongruity.