2001 TOYOTA SEQUOIA O2 sensor

B17499
M±
M+
Ohmmeter SF±40
± SFITHROTTLE BODY
2774 Author: Date:
2005 SEQUOIA (RM1146U)
3. INSPECT THROTTLE CONTROL MOTOR
(a) Disconnect the throttle control motor connector.
(b) Using an ohmmeter, measure the motor resistance be-
tween terminals M+ and M±.
Motor resistance: 0.3 to 100 W at 20°C (68°F)
If the resistance is not as specified, replace the throttle body as-
sembly (see page SF±42).
(c) Reconnect the throttle control motor connector.
4. INSPECT THROTTLE POSITION SENSOR
(See page DI±127)
If necessary, replace the throttle body assembly (see page
SF±42).
5. REINSTALL THROTTLE BODY COVER

SF1XR±01
S04947
Continuity
Ohmmeter
Ohmmeter
No Continuity 12
35
S04946
BatteryOhmmeter
Continuity 12
35
± SFIA/F SENSOR HEATER RELAY
SF±57
2791 Author: Date:
2005 SEQUOIA (RM1146U)
A/F SENSOR HEATER RELAY
INSPECTION
1. REMOVE RELAY BOX COVER
2. REMOVE A/F SENSOR HEATER RELAY (Marking: A/F
HTR)
3. INSPECT A/F SENSOR HEATER RELAY CONTINUITY
(a) Using an ohmmeter, check that there is continuity be-
tween terminals 1 and 2.
If there is no continuity, replace the relay.
(b) Check that there is no continuity between terminals 3 and
5.
If there is continuity, replace the relay.
4. INSPECT A/F SENSOR HEATER RELAY OPERATION
(a) Apply battery voltage across terminals 1 and 2.
(b) Using an ohmmeter, check that there is continuity be-
tween terminals 3 and 5.
If there is no continuity, replace the relay.
5. REINSTALL A/F SENSOR HEATER RELAY
6. REINSTALL RELAY BOX COVER

SF0PN±14
B17471
PS Air Hose
PCV Hose
Intake Air Connector

GasketECT Sensor
Connector
ECT Sensor
N´m (kgf´cm, ft´lbf) : Specified torque

Non±reusable part
Vacuum HoseThrottle Body Cover
MAF Meter Wire
Suction Hose
20 (204, 15)
SF±64
± SFIENGINE COOLANT TEMPERATURE (ECT) SENSOR
2798 Author: Date:
2005 SEQUOIA (RM1146U)
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
COMPONENTS

SF0PO±19
B02308
S01196S01699Z17274
Ohmmeter
Resistance kW
Temperature °C (°F) Acceptable 30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
40 ±20 0 20 60 80 100
(212) (176) (140) (104) (68) (32) (±4)
± SFIENGINE COOLANT TEMPERATURE (ECT) SENSOR
SF±65
2799 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION
1. DRAIN ENGINE COOLANT
2. REMOVE THROTTLE BODY COVER
3. REMOVE INTAKE AIR CONNECTOR
4. DISCONNECT THROTTLE BODY FROM INTAKE MAN-
IFOLDS
Remove the nut and 3 bolts, and disconnect the throttle body
from the intake manifold.
5. REMOVE ECT SENSOR
(a) Disconnect the ECT sensor connector.
(b) Remove the ECT sensor and gasket.
6. INSPECT ECT SENSOR
Using an ohmmeter, measure the resistance between the ter-
minals.
Resistance: Refer to the graph
If the resistance is not as specified, replace the ECT sensor.
7. REINSTALL ECT SENSOR
(a) Install a new gasket and the ECT sensor.
Torque: 19.6 N´m (200 kgf´cm, 14 ft´lbf)
(b) Connect the ECT sensor connector.
8. REINSTALL THROTTLE BODY TO INTAKE MAN-
IFOLDS
Install a new gasket and the throttle body with the 2 bolts and
2 nuts.
Torque: 20 N´m (204 kgf´cm, 15 ft´lbf)
9. REINSTALL INTAKE AIR CONNECTOR
10. REFILL WITH ENGINE COOLANT (See page CO±2)
11. REINSTALL THROTTLE BODY COVER

SF0PR±17
B17459
Throttle Body Cover
PS Air Hose
Intake Air Connector
Suction Hose
MAF Meter Wire
PCV Hose
Vacuum Hose
SF±66
± SFIKNOCK SENSOR
2800 Author: Date:
2005 SEQUOIA (RM1146U)
KNOCK SENSOR
COMPONENTS

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 1Fuel Return Hose
Intake Manifold
Assembly
Engine Wire
20 (204, 15)20 (204, 15)
Air Pump Assembly
16 (163, 12)
16 (163, 12)
± SFIKNOCK SENSOR
SF±67
2801 Author: Date:
2005 SEQUOIA (RM1146U)

SF1XU±01
B17474
B17475
B17503
Engine
Rear
Engine
RearUpper
Upper
0° ± 10°0° ± 10° SF±68
± SFIKNOCK SENSOR
2802 Author: Date:
2005 SEQUOIA (RM1146U)
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 kW 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 torqueAir±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)
± SFIAIR±FUEL RATIO (A/F) SENSOR
SF±69
2803 Author: Date:
2005 SEQUOIA (RM1146U)
AIR±FUEL RATIO (A/F) SENSOR
COMPONENTS