2001 TOYOTA SEQUOIA coolant

I08286
E2
Engine Coolant
Temp. Sensor
1 2Integration Control and Panel
I22 E821
28
E8E2 THWECM
THWO
E5 14
W±R2 G±Y
G±WTW DI±2328
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2522 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 14 Engine Coolant Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the engine coolant temperature and sends the appropriate signals to the integration
control and panel. These signals are used for warm up control when the engine is cold.
DTC No.Detection ItemTrouble Area
14Open or short in engine coolant temperature sensor circuit.

Engine coolant temp. sensor

Harness or connector between engine coolant temp. sensor
and ECM

Harness or connector between ECM and integration control
and panel

ECM

Integration control and panel
WIRING DIAGRAM
DI935±03

EM1WX±01
A08934
A04329
A04331
EM±16
± ENGINE MECHANICALTIMING BELT
2595 Author: Date:
2005 SEQUOIA (RM1146U)
REMOVAL
1. REMOVE ENGINE UNDER COVER
2. DRAIN ENGINE COOLANT
3. REMOVE RADIATOR ASSEMBLY (See page CO±17)
4. REMOVE THROTTLE BODY COVER
5. REMOVE INTAKE AIR CONNECTOR ASSEMBLY
6. REMOVE DRIVE BELT, FAN, FLUID COUPLING AND
FAN PULLEY
(a) Loosen the 4 nuts holding the fluid coupling to the fan
bracket.
(b) Remove the drive belt. (See page CH±7)
(c) Remove the 4 nuts, the fan, fluid coupling assembly and
fan pulley.
7. DISCONNECT PS PUMP
Remove the 3 bolts, and disconnect the PS pump from the en-
gine.
HINT:
Suspend the PS pump securely.
8. REMOVE DRIVE BELT IDLER PULLEY
Remove the pulley bolt, cover plate and idler pulley.
9. REMOVE RH NO.3 TIMING BELT COVER
Remove the 3 bolts, nut and RH No.3 timing belt cover.
10. REMOVE LH NO.3 TIMING BELT COVER
(a) Disconnect the engine wire from the 2 wire clamps.
(b) Remove the 4 bolts and nut.
(c) Disconnect the camshaft position sensor wire from the
wire clamp on the LH No.3 timing belt cover.
(d) Disconnect the camshaft position sensor connector from
the connector bracket.
(e) Disconnect the camshaft position sensor connector.
(f) Remove the wire grommet from the LH No.3 timing belt
cover.

A04331
A08934
EM±28
± ENGINE MECHANICALTIMING BELT
2607 Author: Date:
2005 SEQUOIA (RM1146U)
23. INSTALL LH NO.3 TIMING BELT COVER
(a) Install the oil cooler pipe with the bolt and nut.
(b) Run the camshaft position sensor wire through the LH
No.3 timing belt cover hole.
(c) Fit the LH No.3 timing belt cover, matching it with the fan
bracket.
(d) Install the LH No.3 timing belt cover with the 4 bolts and
nut.
Torque: 7.5 N´m (76 kgf´cm, 66 in.´lbf)
(e) Install the wire grommet to the LH No.3 timing belt cover.
(f) Install the camshaft position sensor connector to the con-
nector bracket.
(g) Connect the camshaft position sensor connector.
(h) Install the sensor wire to the wire clamp on the LH No.3
timing belt cover.
(i) Install the engine wire to the 2 wire clamps on the LH No.3
timing belt cover.
24. INSTALL DRIVE BELT IDLER PULLEY
Install the idler pulley and cover plate with the bolt.
Torque: 39 N´m (400 kgf´cm, 29 ft´lbf)
25. INSTALL PS PUMP
Install the PS pump with the 3 bolts.
Torque: 17 N´m (175 kgf´cm, 13 ft´lbf)
26. INSTALL FAN PULLEY, FAN, FLUID COUPLING
AND DRIVE BELT
(a) Temporarily install the fan pulley, the fan, fluid coupling
assembly with the 4 nuts.
(b) Install the drive belt. (See page CH±16)
(c) Tighten the 4 nuts holding the fluid coupling to the fan
bracket.
Torque: 29 N´m (296kgf´cm, 21 ft´lbf)
27. INTAKE AIR CONNECTOR ASSEMBLY
28. INSTALL THROTTLE BODY COVER
29. INSTALL RADIATOR ASSEMBLY (See page CO±18)
30. FILL WITH ENGINE COOLANT
31. START ENGINE AND CHECK FOR LEAKS
32. RECHECK ENGINE COOLANT LEVEL
33. INSTALL ENGINE UNDER COVER

EM1X0±01
A02844
EM±36
± ENGINE MECHANICALCYLINDER HEAD
2615 Author: Date:
2005 SEQUOIA (RM1146U)
REMOVAL
1. DRAIN ENGINE COOLANT
2. REMOVE THROTTLE BODY COVER
3. DISCONNECT TIMING BELT FROM CAMSHAFT TIM-
ING PULLEYS (See page EM±16)
NOTICE:

Be careful not to drop anything inside the timing belt
cover.

Do not allow the belt to come into correct with oil, wa-
ter or dust.
4. REMOVE CAMSHAFT TIMING PULLEYS
(See page EM±16)
5. REMOVE CAMSHAFT POSITION SENSOR
(See page IG±8)
6. DISCONNECT PS PUMP FROM ENGINE
(See page EM±79)
7. REMOVE FRONT EXHAUST PIPE (See page EM±126)
8. REMOVE OIL DIPSTICK AND GUIDE FOR A/T
9. REMOVE IGNITION COILS (See page IG±5)
10. REMOVE TIMING BELT REAR PLATES
(a) Remove the 3 bolts, stud bolt and RH No.1 timing belt rear
plates.
(b) Disconnect the wire clamp from the LH timing belt rear
plate.
(c) Remove the 3 bolts, stud bolt and LH No.1 timing belt rear
plates.
11. DISCONNECT FUEL INLET HOSE (See page SF±27)
AND FUEL RETURN HOSE
12. DISCONNECT CONNECTORS FROM INTAKE MAN-
IFOLD
(a) Disconnect the throttle control connector.
(b) Disconnect the VSV connector for EVAP.
(c) Disconnect the 8 injector connectors.
(d) Disconnect the ECT sensor connector.
(e) Disconnect the 2 VSV connectors for the air injection sys-
tem.
(f) Disconnect the 8 ignition coil connectors.
(g) Disconnect the 2 air fuel ratio sensor connectors.

EM120±07
B07536
Disconnect
± ENGINE MECHANICALENGINE UNIT (2WD)
EM±79
2658 Author: Date:
2005 SEQUOIA (RM1146U)
REMOVAL
1. REMOVE ENGINE HOOD
2. REMOVE ENGINE UNDER COVER
3. DISCONNECT BATTERY CABLES
(a) Disconnect the clamp on battery negative (±) cable from
the No.2 relay box.
(b) Disconnect the battery positive (+) terminal cable.
(c) Disconnect battery negative (±) cable from the left fender
apron.
4. DRAIN ENGINE COOLANT
5. REMOVE RADIATOR ASSEMBLY (See page CO±17)
6. REMOVE THROTTLE BODY COVER
7. REMOVE AIR CLEANER AND INTAKE AIR CONNEC-
TOR ASSEMBLY
(a) Disconnect the MAF meter connector.
(b) Loosen the 3 bolts, and remove the air cleaner case.
(c) Remove the suction hose from the intake air connector.
(d) Disconnect the PS air hose, air inlet hose for EVAP, PCV
hose and MAF meter wire from the air intake connector.
(e) Disconnect the intake air connector from the throttle body.
8. REMOVE DRIVE BELT, FAN, FLUID COUPLING AND
FAN PULLEY
(a) Loosen the 4 nuts holding the fluid coupling to the fan
bracket.
(b) Remove the drive belt. (See page CH±7)
(c) Remove the 4 nuts, the fan, fluid coupling assembly and
fan pulley.
9. DISCONNECT ENGINE WIRE FROM CABIN
(a) Remove the glove compartment door.
(b) Remove the lower No.2 panel.
(c) Remove the 3 screws, and disconnect the ECM from the
body bracket.
(d) Disconnect the 3 wire harness connectors from the ECM.
(e) Disconnect the 2 wire harness connectors (cassette con-
nector).
(f) Disconnect the engine wire from the engine wire bracket
and remove the bolt, 2 nuts and bracket.
(g) Pull out the engine wire from the cowl panel.
10. DISCONNECT HOSES, WIRES, CONNECTORS,
CLAMPS, GROMMET AND CABLES
(a) Disconnect the 2 PS air hoses from hose clamp on the
No.3 RH timing belt cover.
(b) Disconnect the generator wire.
(c) Disconnect the generator connector.

A09152
Connect
± ENGINE MECHANICALENGINE UNIT (2WD)
EM±87
2666 Author: Date:
2005 SEQUOIA (RM1146U)
(b) Install the engine wire bracket with the 2 nuts and bolt and
connect the engine wire to the bracket.
(c) Connect the 2 wire harness connectors (cassette con-
nector).
(d) Connect the 3 connectors to the ECM.
(e) Install the ECM with the 3 screws.
(f) Install the lower No.2 panel.
(g) Install the glove compartment door.
19. INSTALL FAN PULLEY, FAN, FLUID COUPLING AND
DRIVE BELT
(a) Temporarily install the fan pulley, the fan and fluid cou-
pling assembly with the 4 nuts.
(b) Install the drive belt. (See page CH±16)
(c) Tighten the 4 nuts holding the fluid coupling to the fan
bracket.
20. INSTALL AIR CLEANER AND INTAKE AIR CONNEC-
TOR ASSEMBLY
(a) Install the air cleaner with the 3 bolt.
Torque: 5.0 N´m (51 kgf´cm, 44 in.´lbf)
(b) Connect the intake air connector to the throttle body.
(c) Connect the MAF meter connector.
(d) Install the suction hose to the intake air connector.
(e) Connect the PS air hose, air inlet hose for EVAP, PCV
hose and MAF meter wire to the air intake connector.
21. INSTALL THROTTLE BODY COVER
22. INSTALL RADIATOR ASSEMBLY (See page CO±18)
23. INSTALL BATTERY CABLES
(a) Connect the clamp on battery negative (±) cable to No.2
relay box.
(b) Connect the battery positive (+) terminal cable.
(c) Connect the battery negative cable to the left fender
apron.
24. PERFORM INITIALIZATION
Some system need initialzation when disconnecting the cable
from the battery terminal.
25. FILL WITH ENGINE COOLANT (See page CO±2)
26. FILL WITH ENGINE OIL (See page LU±2)
27. START ENGINE AND CHECK FOR LEAKS
28. INSTALL ENGINE UNDER COVER
29. INSTALL HOOD
30. PERFORM ROAD TEST
Check for abnormal noise, shock, slippage, correct shift points
and smooth operation.
31. RECHECK ENGINE COOLANT AND OIL LEVELS

EM11X±07
EM±92
± ENGINE MECHANICALENGINE UNIT (4WD)
2671 Author: Date:
2005 SEQUOIA (RM1146U)
REMOVAL
1. REMOVE FRONT EXHAUST PIPES
(See page EM±126)
2. REMOVE FRONT AND REAR PROPELLER SHAFTS
(See page PR±7)
3. REMOVE FRONT STABILIZER BAR
(See page SA±91)
4. REMOVE TRANSMISSION (See page AT±25)
5. REMOVE ENGINE HOOD
6. REMOVE ENGINE UNDER COVER
7. DISCONNECT BATTERY CABLES
(a) Disconnect the clamp on battery negative (±) cable from
the No.2 relay box.
(b) Disconnect the battery positive (+) terminal cable.
(c) Disconnect the battery negative (±) cable from the left
fender apron.
8. DRAIN ENGINE COOLANT
9. REMOVE RADIATOR ASSEMBLY (See page CO±17)
10. REMOVE THROTTLE BODY COVER
11. REMOVE AIR CLEANER AND INTAKE AIR CONNEC-
TOR ASSEMBLY
(a) Disconnect the MAF meter connector.
(b) Loosen the 3 bolts, and remove the air cleaner case.
(c) Remove the suction hose from the intake air connector.
(d) Disconnect the PS air hose, air inlet hose for EVAP, PCV
hose and MAF meter wire from the air intake connector.
(e) Disconnect the intake air connector from the throttle body.
12. REMOVE DRIVE BELT, FAN, FLUID COUPLING AND
FAN PULLEY
(a) Loosen the 4 nuts holding the fluid coupling to the fan
bracket.
(b) Remove the drive belt. (See page CH±16)
(c) Remove the 4 nuts, the fan, fluid coupling assembly and
fan pulley.
13. DISCONNECT ENGINE WIRE FROM CABIN
(a) Remove the glove compartment door.
(b) Remove the lower No.2 panel.
(c) Remove the 3 screws, and disconnect the ECM from the
body bracket.
(d) Disconnect the 3 wire harness connectors from the ECM.
(e) Disconnect the 2 wire harness connectors (cassette con-
nector).

A09152
Connect
± ENGINE MECHANICALENGINE UNIT (4WD)
EM±97
2676 Author: Date:
2005 SEQUOIA (RM1146U)
(b) Install the engine wire bracket with the 2 nuts and bolt and
connect the engine wire to the bracket.
(c) Connect the 3 connectors to the ECM.
(d) Connect the 2 wire harness connectors (cassette con-
nector).
(e) Install the ECM with the 3 screws.
(f) Install the lower No.2 panel.
(g) Install the glove compartment door.
7. INSTALL FAN PULLEY, FAN, FLUID COUPLING AND
DRIVE BELT
(a) Temporarily install the fan pulley, the fan and fluid cou-
pling assembly with the 4 nuts.
(b) Install the drive belt. (See page CH±16)
(c) Tighten the 4 nuts holding the fluid coupling to the fan
bracket.
8. INSTALL AIR CLEANER AND INTAKE AIR CONNEC-
TOR PIPE ASSEMBLY
(a) Install the air cleaner case with the 3 bolts.
Torque: 5.0 N´m (51 kgf´cm, 44 in.´lbf)
(b) Connect the intake air connector to the throttle body.
(c) Connect the MAF meter connector.
(d) Install the suction hose to the intake air connector.
(e) Connect the PS air hose, air inlet hose for EVAP, PCV
hose and MAF meter connector to the intake air connec-
tor.
9. INSTALL THROTTLE BODY COVER
10. INSTALL TRANSMISSION (See page AT±29)
11. INSTALL RADIATOR ASSEMBLY (See page CO±18)
12. INSTALL FRONT STABILIZER BAR
(See page SA±93)
13. INSTALL FRONT AND REAR PROPELLER SHAFTS
(See page PR±9)
14. INSTALL FRONT EXHAUST PIPES
(See page EM±126)
15. INSTALL BATTERY CABLES
(a) Connect the battery positive (+) terminal cable.
(b) Connect the battery negative (±) cable to the battery and
left fender apron.
(c) Connect the clamp on battery negative (±) cable to No.2
relay box.
16. PERFORM INITIALIZATION
Some system need initialzation when disconnecting the cable
from the battery terminal.
17. FILL WITH ENGINE COOLANT (See page CO±2)
18. FILL WITH ENGINE OIL (See page LU±2)
19. START ENGINE AND CHECK FOR LEAKS
20. INSTALL ENGINE UNDER COVERS
21. INSTALL HOOD