Page 2729 of 4323

B17663
Port APurge Port
Vent PortAir Inlet Port
Pressure Gauge Port B
B17603
A
B C
Air
B17604
7Closed
Valve6
± EMISSION CONTROLEVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
EC±13
2721 Author: Date:
2005 SEQUOIA (RM1146U)
(c) Check for air leakage.
(1) Remove the air hose between ports A and B.
(2) Connect the pressure gauge to the vent port of the
charcoal canister.
(3) While holding port B, with the purge port and the air
inlet port closed and port A open, apply pressurized
air 19.6 kPa (0.2 kgf/cm
2, 2.81 psi) of pressurized
air into the vent port, then confirm that the pressure
is retained for 1 minute.
If the result is not as specified, replace the charcoal canister as-
sembly.
(d) Check leak detection pump.
(1) Remove the detection pump from the charcoal can-
ister.
(2) Check that air flows from port A to B and then C.
If the result is not as specified, replace the charcoal canister as-
sembly.
(3) Connect the positive (+) lead to terminal 7 and the
negative (±) lead to terminal 6.
(4) Check that the valve is closed.
If the result is not as specified, replace the charcoal canister as-
sembly.
(5) Install the detection pump.
9. INSPECT VSV FOR EVAP (See page SF±63)
10. REINSTALL CHARCOAL CANISTER ASSEMBLY
Page 2730 of 4323
EC0JM±02
EC±14± EMISSION CONTROLTHREE±WAY CATALYTIC CONVERTER (TWC)
SYSTEM
2722 Author: Date:
2005 SEQUOIA (RM1146U)
THREE±WAY CATALYTIC CONVERTER (TWC) SYSTEM
ON±VEHICLE INSPECTION
1. CHECK EXHAUST PIPE ASSEMBLY
(a) Check the connections for looseness or damage.
(b) Check the clamps for weakness, cracks or damage.
2. INSPECT TWC
Check for dents or damage.
If any part of protector is damaged or dented to the extent that it contacts the TWC, repair or replace it.
3. INSPECT HEAT INSULATOR
(a) Check the heat insulator for damage.
(b) Check for adequate clearance between the TWC and heat insulator.
Page 2731 of 4323
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
Page 2732 of 4323
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)
Page 2733 of 4323
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.
Page 2734 of 4323

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.
Page 2735 of 4323
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
Page 2736 of 4323
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)