Toyota Sequoia (2005). Manual - part 686

EC0O3–01

B17526

B17525

–

EMISSION CONTROL

SECONDARY AIR INJECTION SYSTEM

EC–25

2733

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 CONTROL

SECONDARY AIR INJECTION SYSTEM

2734

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

–

SFI

SFI SYSTEM

SF–1

2735

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.

FI2553

SST

B16498

New Gasket

SF–2

–

SFI

SFI SYSTEM

2736

(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.