O2 sensor TOYOTA SEQUOIA 2001 Service Repair Manual

I28852
HOTCOOL
4
532 4
5
2
3
1
1
DI±2354
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2548 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check water valve damper position sensor.
PREPARATION:
Remove the water valve servomotor (See page AC±42).
CHECK:
Measure the resistance between terminals 1 and 2 of the water
valve servomotor connector.
OK:
Resistance : 4.2 to 7.8 kW
CHECK:
While operating the water valve servomotor, following the pro-
cedure on page DI±2361, measure the resistance between ter-
minals 2 and 3 of the water valve servomotor connector.
OK:
PositionResistance
Max. cool0.8 to 1.6 kW
Max. hot3 to 5.6 kW
HINT:
As the water valve servomotor moves from the cool side to the
hot side, the resistance decreases.
NG Replace water valve servomotor.
OK
3 Check harness and connector between water valve damper position sensor and
integration control and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

I28839
A17 Air Mix Damper
Control Servomotor (Front)
1
210
9AMH
AMC Integration Control and Panel
R±L
W±LI20 MHOT
I20 MCOOL
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2355
2549 Author: Date:
DTC 41 Front Air Mix Damper Control Servomotor
Circuit
CIRCUIT DESCRIPTION
The front air mix damper control servomotor is controlled by the integration control and panel and moves
the air mix damper to the desired position.
DTC No.Detection ItemTrouble Area
41
Air mix damper position sensor value does not change even if
integration control and panel operates air mix damper control
servomotor.

Front air mix damper control servomotor

Front air mix damper position sensor

Harness or connector between front air mix position sensor
and integration control and panel

Harness or connector between air mix damper control servo-
motor and integration control and panel

Integration control and panel
WIRING DIAGRAM
DI3FI±15

I28840
A16 Air Inlet Damper
Control Servomotor
520
8AIR
AIF Integration Control and Panel
G±W
I20
R 4
REC
FRS
I20 DI±2358
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2552 Author: Date:
DTC 42 Air Inlet Damper Control Servomotor Circuit
CIRCUIT DESCRIPTION
The air inlet damper control servomotor is controlled by the integration control and panel and moves the air
inlet damper to the desired position.
DTC No.Detection itemTrouble Area

Air inlet damper control servomotor

Air inlet damper position sensor
42
Air inlet damper position sensor value does not change even if
integration control and panel operated air inlet damper control
servomotor

Harness or connector between air inlet damper control servo-
motor and integration control and panel

Harness or connector between air inlet damperposition sen-servomotor.
Harness or connector between air inlet damper position sen-
sor and integration control and panel

Integration control and panel
WIRING DIAGRAM
DI3FJ±14

I28841
Integration Control
and Panel
5
IJ3
I219
RrAMC
RrAMH L±B
BH13
4
R±G R±G A34
A/C Water Valve (Rear)
R±G L±B
28
10 L±B w/ Rear A/C:
7
M.COOL
M.HOTI21 IJ3 BH1
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2361
2555 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 47 Water Valve Damper Control Servomotor
Circuit
CIRCUIT DESCRIPTION
The water valve damper control servomotor is controlled by the integration control and panel and moves the
water valve damper to the desired position.
DTC No.Detection ItemTrouble Area
47
Water valve damper position sensor value does not change
even if integration control and panel operates water valve
damper control servomotor.

Water valve damper control servomotor

Water valve damper position sensor

Harness or connector between water valve damper control
servomotor and integration control and panel

Harness or connector between water valve damper position
sensor and integration control and panel

Integration control and panel
WIRING DIAGRAM
DI936±04

I21123
Integration Control
and Panel
10
3A16
I19SPD G±O 10
3DSub J/B No. 4
G±O 3
C5 Combination Meter DI±2370
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2564 Author: Date:
2005 SEQUOIA (RM1146U)
Vehicle Speed Signal Circuit
CIRCUIT DESCRIPTION
The integration control and panel monitors the vehicle speed through signals sent from the speed sensor.
It uses these signals to receive the ambient temperature sensor signal.
WIRING DIAGRAM
DI3WE±18

I28845
ECM
E5
E5G±BIntegration Control
and Panel
I22
ACT
AC1
8 25
24
L±W 2
21
5 MG CLT Relay
J3 J/C
15
IG4 C
C Engine Room J/B
2
2C4
2G
3
A3
A/C Magnetic Clutch
and Lock Sensor R±Y
IA1 LG±B5
4
Engine Room R/B No. 2
2 22 G±Y
MGC 5
I19 I22 ACT
AC1
IA5
R±Y1
L±W L±W
R±Y
L
L
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2381
2575 Author: Date:
2005 SEQUOIA (RM1146U)
Compressor Circuit
CIRCUIT DESCRIPTION
The integration control and panel outputs the magnetic clutch ON signal from terminal AC1 to the ECM.
When the ECM receives this signal, it sends a signal from terminal ACT and switches the A/C magnetic clutch
relay ON. This turns the A/C magnetic clutch on.
WIRING DIAGRAM
DIAA8±03

EM±2
± ENGINE MECHANICALCO/HC
2581 Author: Date:
2005 SEQUOIA (RM1146U)
5. IMMEDIATELY CHECK CO/HC CONCENTRATION AT
IDLE AND/OR 2,500 RPM
HINT:
When performing the 2 mode (2,500 rpm and idle) test, follow
the measurement orders are prescribed by the applicable local
regulations.
If the CO/HC concentration does not comply with regulations,
perform troubleshooting in the order given below.
(a) Check the air±fuel ratio sensors and heated oxygen sen-
sors operation.(See page DI±88 and DI±93)
(b) See the table below for possible causes, and then inspect
and correct the applicable causes if necessary.
COHCProblemsCauses
NormalHighRough idle7. Faulty ignitions:

Incorrect timing

Fouled, shorted or improperly gapped plugs
8. Incorrect valve clearance
9. Leaky intake and exhaust valves
10.Leaky cylinders
LowHighRough idle
(fluctuating HC reading)1. Vacuum leaks:

PCV hoses

Intake manifold

Throttle body

Brake booster line
2. Lean mixture causing misfire
HighHighRough idle
(Black smoke from exhaust)1. Restricted air filter
2. Faulty SFI systems:

Faulty pressure regulator

Defective ECT sensor

Faulty ECM

Faulty injectors

Faulty throttle position sensor

Faulty MAF meter

A23302
RH No.3 Timing Belt Cover
No.2 Timing
Belt Cover
LH No.3 Timing Belt Cover Drive Belt Idler Pulley
Camshaft Position
Sensor ConnectorCover Plate
Oil Cooler Pipe Engine Wire
7.5 (76, 66 in.´lbf)
16 (160, 12)
7.5 (76, 66 in.´lbf)
N´m (kgf´cm, ft´lbf) : Specified torque
Wire Grommet
39 (400, 29)
A23303
Timing BeltLH Camshaft Timing Pulley
Timing Belt Tensioner
Dust Boot
245 (2,500, 181)
16 (160, 12)
32 (330, 24)
RH Camshaft Timing Pulley
26 (270, 19)Fan Bracket
N´m (kgf´cm, ft´lbf) : Specified torque
8.1 (83, 72 in.´lbf)
EM±14
± ENGINE MECHANICALTIMING BELT
2593 Author: Date:
2005 SEQUOIA (RM1146U)

A23304
Generator WireDrive Belt Tensioner
No.1 Timing Belt Cover Generator
Crankshaft Pulley
39 (400, 29)
No.1 Idler Pulley
Timing Belt
Plate Washer
Crankshaft Timing Pulley
Timing Belt Cover Spacer No.2 Idler Pulley
Timing Belt Guide
(Crankshaft Angle Sensor Plate)Gasket
34.5 (350, 25)
34.5 (350, 25)

N´m (kgf´cm, ft´lbf) : Specified torque

Precoated part
26 (265, 19)
39 (400, 29)
15.5 (158, 11)
± ENGINE MECHANICALTIMING BELT
EM±15
2594 Author: Date:
2005 SEQUOIA (RM1146U)

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.