TOYOTA SEQUOIA 2001 Service Repair Manual

EC08C±05
B17492
N´m (kgf´cm, ft´lbf): Specified torque

Non±reusable partRH Front Exhaust Pipe
RH TWC GasketHeated Oxygen Sensor
Ring
LH Front
Exhaust Pipe

62 (632, 46)
Gasket



Gasket

Heated Oxygen
Sensor
Gasket

LH TWC
62 (632, 46)

48 (489, 35)
44 (450, 32)
44 (450, 32)
± EMISSION CONTROLTHREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEMEC±15
2723 Author: Date:
2005 SEQUOIA (RM1146U)
COMPONENTS

EC0NQ±01
A23379
A23380
A23381
EC±16± EMISSION CONTROLTHREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEM
2724 Author: Date:
2005 SEQUOIA (RM1146U)
REPLACEMENT
1. DISCONNECT HEATED OXYGEN SENSORS
Remove the 2 heated oxygen sensors from the front exhaust
pipes.
2. REMOVE RH AND LH FRONT EXHAUST PIPES
(a) Remove the 6 nuts from the front side of the RH and LH
front exhaust pipes.
(b) Remove the 4 bolts from the rear side of the RH and LH
front exhaust pipes.
(c) Remove the RH and LH front exhaust pipes and 4 gas-
kets.
3. INSTALL RH AND LH FRONT EXHAUST PIPES
(a) Install 4 new gaskets to the RH and LH front exhaust
pipes.
(b) Install the 4 bolts.
Torque: 48 N´m (489 kgf´cm, 35 ft´lbf)
(c) Install 6 new nuts to the front side of the RH and LH front
exhaust pipes.
Torque: 62 N´m (632 kgf´cm, 46 ft´lbf)
4. INSTALL HEATED OXYGEN SENSOR
Install the 2 heated oxygen sensors to the RH and LH front ex-
haust pipes.
Torque: 44 N´m (450 kgf´cm, 32 ft´lbf)

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.

B17517
Air
B17612
B17613
EC±18
± EMISSION CONTROLSECONDARY AIR INJECTION SYSTEM
2726 Author: Date:
2005 SEQUOIA (RM1146U)
(e) Apply positive battery between the terminals, check that
air flows from the ports.
If the result is not as specified, replace the VSV.
(f) Connect the 2 vacuum hoses to the VSV.
NOTICE:
Be sure to connect the vacuum hoses correctly.
(g) Connect the connector to the VSV.
(h) Perform procedures (a) to (g) to the other VSV.
3. INSPECT NO. 2 AIR SWITCHING VALVE
(a) Disconnect the vacuum hose from the VSV for the air in-
jection system.
(b) Apply vacuum (30 kPa (306 gf/cm
2, 4.35 psi) to vacuum
hose, check that the vacuum does not decrease.
If operation is not as specified, replace the No.2 air switching
valve.
(c) Release the vacuum, and check that the operation sound
is emited from the No.2 air switching valve.
If operation is not as specified, replace the No.2 air switching
valve.
(d) Perform procedures (a) to (c) to the other No.2 air seitch-
ing valve.

EC0NZ±01
B17631
Throttle Body Cover
PS Air Hose
Intake Air Connector
Suction Hose
MAF Meter Wire
PCV Hose
Vacuum Hose
Air Injection Control
Driver
N´m (kgf´cm, ft´lbf): Specified torque
7.5 (76, 66 in.´lbf)
± EMISSION CONTROLSECONDARY AIR INJECTION SYSTEM
EC±19
2727 Author: Date:
2005 SEQUOIA (RM1146U)
COMPONENTS

B17518

Gasket

Gasket Air Switching Valve No.2
Air Tube No.3
Air Tube No.3
GasketInjection Connector Engine Wire
VSV Connector
for EVAP Fuel Return Hose
N´m (kgf´cm, ft´lbf): Specified torque

Non±reusable part

Gasket

Gasket
Air Pump Assembly
Intake Manifold Assembly

Gasket

Gasket
7.5 (76, 66 in.´lbf)
VSV for Air Injection System
18 (185, 13)
18 (185, 13)
18 (185, 13)
10 (102, 7 )
16 (163, 12)
16 (163, 12)
10 (102, 7 )
10 (102, 7)
EC±20
± EMISSION CONTROLSECONDARY AIR INJECTION SYSTEM
2728 Author: Date:
2005 SEQUOIA (RM1146U)

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.

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.