Page 2809 of 4323
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)
Page 2810 of 4323
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
Page 2811 of 4323
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
Page 2812 of 4323

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.
Page 2813 of 4323

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)
Page 2814 of 4323
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
Page 2815 of 4323
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)
Page 2816 of 4323
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