2001 TOYOTA SEQUOIA Page 18

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

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

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)

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)

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

SF1UN±02
± SFIACCELERATOR PEDAL POSITION SENSOR
SF±79
2813 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION
INSPECT ACCELERATOR PEDAL POSITION SENSOR (See page DI±370)
If necessary, replace the accelerator pedal assembly.
NOTICE:

Be care not to give a shock to the accelerator pedal assembly.

Be care not to disassemble the accelerator pedal assembly.