2001 TOYOTA SEQUOIA O2 sensor harness

N16207
Thermometer
Ice
More than
10 cm (3.94in.)1
2
I28971Temperature Resistance (kW)
9.0 10.0
8.0
5.07.0
4.0
2.0 3.0
0.0
14 32 50 68 86 ±10 0 10 20 30
(F) (C) 6.0
1.0
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2327
2521 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check front evaporator temperature sensor.
PREPARATION:
Remove the front evaporator temperature sensor.
CHECK:
Measure the resistance between terminals 1 and 2 of the evap-
orator temperature sensor connector at each temperature.
OK:
Tester connectionConditionSpecified condition
1±2±10C (14F)7.40 to 9.20 kW
1±2±5C (23F)5.65 to 7.00 kW
1±20C (32F)4.35 to 5.40 kW
1±25C (41F)3.40 to 4.20 kW
1±210C (50F)2.68 to 3.30 kW
1±215C (59F)2.10 to 2.60 kW
1±220C (68F)1.66 to 2.10 kW
1±225C (77F)1.32 to 1.66 kW
1±230C (86F)1.05 to 1.35 kW
NOTICE:

Even slightly touching the sensor may change the re-
sistance value. Be sure to hold the connector of the
sensor.

When measuring, the sensor temperature must be
the same as the ambient temperature.
HINT:
As the temperature increases, the resistance decreases (see
the graph on the left).
NG Replace front evaporator temperature sensor.
OK
3 Check harness and connector between front evaporator temperature sensor and
integration control and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

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

I15861
Integration Control and Panel
A29
A/C Evaporator Temp.
Sensor (Rear)I21
RrTE 17
LG±R
BH18
1
2
1
L±R
L±R10
RrSG 18
IJ3
6 LG±R
BH1 LG±R w/ Rear A/C:
L±R
IJ3
I21 DI±2330
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2524 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 17 Rear Evaporator Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the rear evaporator temperature and sends the appropriate signals to the integration
control and panel.
DTC No.Detection ItemTrouble Area
17Open or short in rear evaporator temperature sensor circuit.

Rear evaporator temp. sensor

Harness or connector between rear evaporator temp. sensor
and integration control and panel

Integration control and panel
WIRING DIAGRAM
DIDKW±01

N16207
Thermometer
Ice
More than
10 cm (3.94in.)1
2
I28971Temperature Resistance (kW)
9.0 10.0
8.0
5.07.0
4.0
2.0 3.0
0.0
14 32 50 68 86 ±10 0 10 20 30
(F) (C) 6.0
1.0
DI±2332
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2526 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check rear evaporator temperature sensor.
PREPARATION:
Remove the rear evaporator temperature sensor (See page
AC±42).
CHECK:
Measure the resistance between terminals 1 and 2 of the evap-
orator temperature sensor connector at each temperature.
OK:
Tester connectionConditionSpecified condition
1±2±10C (14F)7.40 to 9.20 kW
1±2±5C (23F)5.65 to 7.00 kW
1±20C (32F)4.35 to 5.40 kW
1±25C (41F)3.40 to 4.20 kW
1±210C (50F)2.68 to 3.30 kW
1±215C (59F)2.10 to 2.60 kW
1±220C (68F)1.66 to 2.10 kW
1±225C (77F)1.32 to 1.66 kW
1±230C (86F)1.05 to 1.35 kW
NOTICE:

Even slightly touching the sensor may change the re-
sistance value. Be sure to hold the connector of the
sensor.

When measuring, the sensor temperature must be
the same as the ambient temperature.
HINT:
As the temperature increases, the resistance decreases (see
the graph on the left).
NG Replace rear evaporator temperature sensor.
OK
3 Check harness and connector between rear evaporator temperature sensor and
integration control and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

I24455
A31
A/C Room Temp.
Sensor (Rear)
2
SG±RrTRRrTR Integration Control and Panel
14 13
I22
I22 GR±R B
1 w/ Rear A/C:
GR±R
R±Y R±YJ31
E J32F
AJ/C
J31 J32
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2333
2527 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 19 Rear Room Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the temperature inside the cabin and sends the appropriate signals to the integration
control and panel.
DTC No.Detection ItemTrouble Area
19Open or short in rear room temperature sensor circuit.

Rear room temp. sensor

Harness or connector between rear room temp. sensor and
integration control and panel

Integration control and panel
WIRING DIAGRAM
DIDKX±01

I08309
21
I28970
Resistance (kW)
Temperature
4.0
2.0 3.5
1.5
0.0
10 3.0
1.0 2.5
0.5
20 30 40 5060
68 86 104 122140
(C)
(F) 50
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2335
2529 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check rear room temperature sensor.
PREPARATION:
Disconnect the rear room temperature sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the room
temperature sensor connector at each temperature.
OK:
Tester connectionConditionSpecified condition
1±210C (50F)3.00 to 3.73 kW
1±215C (59F)2.45 to 2.88 kW
1±220C (68F)1.95 to 2.30 kW
1±225C (77F)1.60 to 1.80 kW
1±230C (86F)1.28 to 1.47 kW
1±235C (95F)1.00 to 1.22 kW
1±240C (104F)0.80 to 1.00 kW
1±245C (113F)0.65 to 0.85 kW
1±250C (122F)0.50 to 0.70 kW
1±255C (131F)0.44 to 0.60 kW
1±260C (140F)0.36 to 0.50 kW
NOTICE:

Even slightly touching the sensor may change the re-
sistance value. Be sure to hold the connector of the
sensor.

When measuring, the sensor temperature must be
the same as the ambient temperature.
HINT:
As the temperature increases, the resistance decreases (see
the graph on the left).
NG Replace rear room temperature sensor.
OK
3 Check harness and connector between rear room temperature sensor and in-
tegration control and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

Resistance of photo diode
High
Low
Weak
Strong
Strength of solar radiation
I28834
A15
Solar
Sensor
TS 21 Integration Control and Panel
14S5±TS
I20 B
LG 1
2
I20 DI±2336
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2530 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 21 Solar Sensor Circuit
CIRCUIT DESCRIPTION
A photo diode in the solar sensor detects solar radiation and
sends signals to the integration control and panel.
DTC NoDetection ItemTrouble Area
21
Open or short in solar sensor circuit.
Note that output of diagnostic trouble code 21 is not abnormal
when the sensor is not receiving solar radiation.
Solar sensor

Harness or connector between solar sensor and integration
control and panel

Integration control and panel
WIRING DIAGRAM
DI3FB±11

I0830812
DI±2338
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2532 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check solar sensor.
PREPARATION:
Remove the solar sensor.
CHECK:
(a) Cover the sensor with a cloth.
(b) Measure the resistance between terminals 1 and 2 of the
solar sensor connector.
HINT:
Connect the positive (+) lead of the ohmmeter to terminal 2 and
the negative (±) lead to terminal 1 of the solar sensor.
OK:
Tester connectionConditionSpecified condition
A15±1 ± A15±2Sensor is subject to elec-
tric lightExcept 8 W
A15±1 ± A15±2Sensor is covered with a
cloth8 W (No continuity)
NOTICE:
The connection procedure for using a digital tester such as
an TOYOTA electrical tester is shown above. When using
an analog tester, connect the positive (+) lead to terminal
1 and negative (±) lead to terminal 2 of the A/C solar sensor.
HINT:

As the inspection light is moved away from the sensor, the
voltage increases.

Use an incandescent lamp for inspection. Bring it within
30 cm (11.8 in.) of the A/C solar sensor.
NG Replace solar sensor.
OK
3 Check harness and connector between solar sensor and integration control and
panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.