2001 TOYOTA SEQUOIA O2 sensor

I15902
Cool
Warm
DI±2348
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2542 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check front air mix damper position sensor.
PREPARATION:
Remove the front air mix servomotor (See page AC±86).
CHECK:
Measure the resistance between terminals 3 and 4 of the front
air mix servomotor connector.
OK:
Resistance : 4.2 to 7.8 kW
CHECK:
While operating the front air mix servomotor, following the pro-
cedure on page DI±2355, measure the resistance between ter-
minals 3 and 4 of the front air mix servomotor connector.
OK:
PositionResistance
Max. cool3.6 to 6.8 kW
Max. warm0.5 to 1.1 kW
HINT:
As the front air mix servomotor moves from the cool side to the
warm side, the resistance decreases.
NG Replace front air mix servomotor.
OK
3 Check harness and connector between front air mix 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.

(V)
4
1
0
100 %
TPI terminal voltage
Damper opening angle
I15866
A16
Air Inlet Control
Servomotor
1
Y±R 2 311
16
13S5±AI
TPI
SG±TPI Integration Control
and Panel
I20 L±B
W VZ
PT
GNDI20
I20
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2349
2543 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 32 Air Inlet Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air inlet damper and
sends the appropriate signals to the integration control and
panel.
The position sensor is built into the air inlet damper control ser-
vomotor assembly.
DTC No.Detection ItemTrouble Area
32Short to ground or short to power source circuit in air inlet

Air inlet damper position sensor

Harness or connector between air inlet damper position sen-
32Short to ground or short to ower source circuit in air inlet
damper position sensor circuit.

Harness or connector between air inlet dam er osition sen-
sor and integration control and panel

Integration control and panel
WIRING DIAGRAM
DI3FG±10

I25201
RECFRS
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2351
2545 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check air inlet damper position sensor.
PREPARATION:
Remove the air inlet servomotor (See page AC±49).
CHECK:
Measure the resistance between terminals 3 and 2 of the air in-
let servomotor connector.
OK:
Resistance : 4.2 to 7.8 kW
CHECK:
While operating the air inlet servomotor, following the proce-
dure on page DI±2358, measure the resistance between termi-
nals 3 and 2 of the air inlet servomotor connector.
OK:
Resistance
Damper PositionResistance
REC side3.1 to 5.8 kW
FRS side0.8 to 1.6 kW
HINT:
As the air inlet servomotor moves from the REC side to the FRS
side, the resistance decreases.
NG Replace air inlet damper servomotor.
OK
3 Check harness and connectors between air inlet damper position sensor and in-
tegration control and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

4 (V)
1
TP terminal voltage0 100 %
(Cool)
(Hot)
Damper opening angle
I28838
A34 A/C Water Valve (Rear)
3 2
1
W W
5L±Y1
10
18RrS5
RrSG
RrTP Integration Control
and Panel
I21
L±R L±Y
O IJ3 BH1
L±R 7
L±Y
1
W
A L±R
IG
J/C
J438
6
(Shielded)
6 BH1
BH116 w/ Rear A/C:
(Shielded)
O
A VZ
GND
PTI21
I21 IJ3
IJ3
IJ3 DI±2352
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2546 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 37 Water Valve Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air mix damper and
sends the appropriate signals to the integration control and
panel.
The position sensor is built into the water valve damper control
servomotor assembly.
DTC No.Detection ItemTrouble Area
37Short to ground or short to power source circuit in water valve

Water valve damper position sensor

Harness or connector between water valve damper position
37Short to ground or short to ower source circuit in water valve
damper position sensor circuit.

Harness or connector between water valve dam er osition
sensor and integration control and panel

Integration control and panel
WIRING DIAGRAM
DI3FH±14

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