2001 TOYOTA SEQUOIA O2 sensor

SF1XW±01
B17505
+BHT
B17512
C2 C1
A2A±
A2A+
E1
B2 B3
B1 A1A+
A1A±
SF±70
± SFIAIR±FUEL RATIO (A/F) SENSOR
2804 Author: Date:
2005 SEQUOIA (RM1146U)
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 kW 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 ConnectionConditionSpecified Condition
B2±22 (A1A+)
± B1±1 (E1)Ignition switch ON3.3 V
B2±30 (A1A±)
± B1±1 (E1)Ignition switch ON2.9 V
B2±23 (A2A+)
± B1±1 (E1)Ignition switch ON3.3 V
B2±31 (A2A±)
± B1±1 (E1)Ignition switch ON2.9 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.

D13872
Hand±Held Tester
DLC3
CAN VIM
Rich Lean
Time14.6
3.3
Keep Engine Speed
(V)
B17513
Air±fuel
Ratio
± SFIAIR±FUEL RATIO (A/F) SENSOR
SF±71
2805 Author: Date:
2005 SEQUOIA (RM1146U)
(b) Connect a hand±held tester to the Controller Area Net-
work Vehicle Interface Module (CAN VIM). Then connect
the CAN VIM to the Date Link Connector 3 (DLC3).
(c) Turn the ignition switch ON.
(d) Select the following menu items : Data List / A/FS B1 S1
and O2S B1 S2.
(e) Warm up the A/F sensor by running the engine at 2,500
rpm for approximately 2 minutes.
(f) Keep the engine speed at 2,500 rpm and confirm that the
display of the ºA/FS B1 S1º is as shown in the illustration.
HINT:

The illustration may slightly differ from the display on the
hand±held tester.

The waveform of the A/F sensor is displayed only on the
hannd±heldtester .
(g) Confirm that the display of the ºO2S B1 S2º changes be-
tween 0 and 1 V with the engine speed at 2,500 rpm.
OK:
The voltage output oscillates more than 8 times in 10
seconds.
CAUTION:

Perform the check immediately after warming up the
engine.

If the voltage variation could not be verified, warm up
the heated oxygen sensor again. If it could not be veri-
fied even after warming up the sensor again, check
the DTC No. (See page DI±88)

SF0Y9±11
B17506N´m (kgf´cm, ft´lbf) : Specified torqueHeated Oxygen
Sensor Connector
Heated Oxygen Sensor
Engine Under CoverBank 2 Sensor 1
44 (450, 32)
Bank 1 Sensor 1
Heated Oxygen
Sensor Connector Heated Oxygen Sensor
44 (450, 32)
SF±72
± SFIHEATED OXYGEN SENSOR
2806 Author: Date:
2005 SEQUOIA (RM1146U)
HEATED OXYGEN SENSOR
COMPONENTS

SF0YA±14
B17507
+BHT
± SFIHEATED OXYGEN SENSOR
SF±73
2807 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION
1. INSPECT HEATER RESISTANCE OF HEATED OXY-
GEN SENSOR
(a) Disconnect the oxygen sensor connector.
(b) Using an ohmmeter, measure the resistance between ter-
minals +B and HT.
Resistance: 11 to 16 W 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 oxygen sensor connector.
2. INSPECT OPERATION OF HEATED OXYGEN SEN-
SOR (See page DI±93)

SF1XX±02
B17459
Throttle Body Cover
PS Air Hose
Intake Air Connector
Suction Hose
MAF Meter Wire
PCV Hose
Vacuum Hose
SF±74
± SFIVVT SENSOR
2808 Author: Date:
2005 SEQUOIA (RM1146U)
VVT SENSOR
COMPONENTS

B17493
Engine Wire
VSV Connector
for Air Injection
System Engine Wire
Throttle Body
ConnectorFuel Return Hose
Engine WireInjector Connector
VSV Connector for
EVAP
VVT Sensor 2
N´m (kgf´cm, ft´lbf) : Specified torque



Non±reusable partGasket
VVT Sensor 1
VSV Connector
for ACIS
VVT Sensor ConnectorVVT Sensor Connector
18 (185, 13)
18 (185, 13)
7.5 (76, 66 in.´lbf)
± SFIVVT SENSOR
SF±75
2809 Author: Date:
2005 SEQUOIA (RM1146U)

SF0PW±03
B17494
Ohmmeter SF±76
± SFIVVT SENSOR
2810 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION
NOTICE:
ºColdº and ºHot in these sentences express the tempera-
ture of the sensors themselves. ºColdº is from ± 10°C
(14°F) to 50°C (122°F) and ºHotº is from 50 °C (122°F) to
100°C (212°F).
1. REMOVE THROTTLE BODY COVER
2. REMOVE INTAKE MANIFOLD ASSEMBLY
(See page EM±36)
3. INSPECT VVT SENSOR RESISTANCE
(a) Disconnect the VVT sensor connector.
(b) Using an ohmmeter, measure the resistance between the
terminals.
Resistance:
Cold835 to 1,400 W
Hot1,060 to 1,645 W
If the resistance is not as specified, replace the sensor.
(c) Reconnect the VVT sensor connector.
(d) Connect the VVT sensor connector.
4. REINSTALL INTAKE MANIFOLD ASSEMBLY
(See page EM±60)
5. REINSTALL THROTTLE BODY COVER

SF1XY±01
± SFIVVT SENSOR
SF±77
2811 Author: Date:
2005 SEQUOIA (RM1146U)
REPLACEMENT
1. REMOVE THROTTLE BODY COVER
2. REMOVE INTAKE MANIFOLD ASSEMBLY
(See page EM±36)
3. REMOVE VVT SENSOR
(a) Disconnect the VVT sensor connector.
(b) Remove the bolt and VVT sensor.
4. INSTALL VVT SENSOR
(a) Attach a new VVT sensor to the cylinder head.
(b) Install the VVT sensor with the bolt.
Torque: 6.5 N´m (65 kgf´cm, 58 in.´lbf)
5. REINSTALL INTAKE MANIFOLD ASSEMBLY
(See page EM±60)
6. REINSTALL THROTTLE BODY COVER