Toyota Sequoia (2005). Manual - part 703

B17473

Engine Wire Clamp

Injector Connector

 Gasket

18 (185, 13)

N·m (kgf·cm, ft·lbf)

: Specified torque

 Non–reusable part

18 (185, 13)

Knock Sensor 2

VSV Connector
for EVAP

Fuel Inlet Hose

Knock Sensor 1

Fuel Return Hose

Intake Manifold 
Assembly

Engine Wire

20 (204, 15)

20 (204, 15)

Air Pump Assembly

16 (163, 12)

16 (163, 12)

–

SFI

KNOCK SENSOR

SF–67

2801

SF1XU–01

B17474

B17475

B17503

Engine 
Rear

Engine 
Rear

Upper

Upper

0

°

 – 10

°

0

°

 – 10

°

SF–68

–

SFI

KNOCK SENSOR

2802

INSPECTION

1.

REMOVE THROTTLE BODY COVER

2.

REMOVE INTAKE AIR CONNECTOR

3.

REMOVE INTAKE MANIFOLDS ASSEMBLY
(See page 

EM–36

)

4.

INSPECT KNOCK SENSORS 1 AND 2

(a)

Disconnect the knock sensor connectors.

(b)

Using an ohmmeter, measure the resistance between ter-
minals.
Resistance: 120 to 280 k

Ω

 at 20

°

C (68

°

F)

HINT:
If the resistance is not as specified, replace the sensor.

5.

REMOVE KNOCK SENSOR

(a)

Disconnect the 2 knock sensor connectors.

(b)

Remove the 2 nuts and 2 knock sensors.

6.

INSTALL KNOCK SENSOR

(a)

Install the 2 knock sensors with the 2 nuts as shown in the
illustration.
Torque: 20 N·m (204 kgf·cm, 15 ft·lbf)

(b)

Connect the 2 knock sensor connectors.

7.

INSTALL INTAKE MANIFOLD ASSEMBLY
(See page 

EM–60

)

8.

INSTALL INTAKE AIR CONNECTOR

9.

INSTALL THROTTLE BODY COVER

SF1XV–01

B17504

N·m (kgf·cm, ft·lbf)

 Non–reusable part

: Specified torque

Air–fuel Ratio Sensor

Engine Under Cover

Bank 2 Sensor 1

Bank 1 Sensor 1

Air–fuel Ratio 
Sensor Connector

Air–fuel Ratio Sensor

44 (450, 32)

Air–fuel Ratio Sen-
sor Connector

44 (450, 32)

–

SFI

AIR–FUEL RATIO (A/F) SENSOR

SF–69

2803

AIR–FUEL RATIO (A/F) SENSOR

COMPONENTS

SF1XW–01

B17505

+B

HT

B17512

C2

C1

A2A–

A2A+

E1

B2

B3

B1

A1A+

A1A–

SF–70

–

SFI

AIR–FUEL RATIO (A/F) SENSOR

2804

INSPECTION

1.

INSPECT HEATER RESISTANCE OF AIR FUEL RATIO
SENSOR

(a)

Disconnect the air fuel ratio sensor connector.

(b)

Using an ohmmeter, measure the resistance between ter-
minals +B and HT.
Resistance 11 to 16 k

Ω

 at 20

°

C (68

°

F)

If the resistance is not as specified, replace the sensor.

Torque: 44 N·m (450 kgf·cm, 32 ft·lbf)

(c)

Reconnect the air fuel ratio sensor connector.

2.

INSPECT OPERATION OF AIR FUEL RATIO SENSOR
(See page 

DI–88

)

3.

INSPECT AIR–FUEL RATIO COMPENSATION SYS-
TEM

(a)

Measure the voltage between the terminals of the ECM
connectors.
Standard:

Tester Connection

Condition

Specified Condition

B2–22 (A1A+) 

– B1–1 (E1)

Ignition switch ON

3.3 V

B2–30 (A1A–) 

– B1–1 (E1)

Ignition switch ON

2.9 V

B2–23 (A2A+) 

– B1–1 (E1)

Ignition switch ON

3.3 V

B2–31 (A2A–) 

– B1–1 (E1)

Ignition switch ON

2.9 V

NOTICE:
Connect test leads from the back side of the connector. The
connectors should not be disconnected from the ECM.
HINT:
The voltage between the terminals of the ECM is kept constant
regardless of the voltage of the A/F sensor.