sensor TOYOTA SIENNA 2007 Service Repair Manual

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–31
AC
(a) Remove the ambient temperature sensor.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NOTICE:
• Even slightly touching the sensor may change the
resistance 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).
NG
OK
2INSPECT AMBIENT TEMPERATURE SENSOR
E118395E14
Tester Connection Condition Specified Condition
A1-1 - A1-2 10
C (50F) 3.00 to 3.73 k
A1-1 - A1-2 15C (59F) 2.45 to 2.88 k
A1-1 - A1-2 20C (68F) 1.95 to 2.30 k
A1-1 - A1-2 25C (77F) 1.60 to 1.80 k
A1-1 - A1-2 30C (86F) 1.28 to 1.47 k
A1-1 - A1-2 35C (95F) 1.00 to 1.22 k
A1-1 - A1-2 40C (104F) 0.80 to 1.00 k
A1-1 - A1-2 45C (113F) 0.65 to 0.85 k
A1-1 - A1-2 50C (122F) 0.50 to 0.70 k
A1-1 - A1-2 55C (131F) 0.44 to 0.60 k
A1-1 - A1-2 60C (140F) 0.36 to 0.50 k
REPLACE AMBIENT TEMPERATURE
SENSOR

AC–32AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
(a) Disconnect the ambient temperature sensor connector.
(b) Disconnect the A/C amplifier connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
3CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - A/C
AMPLIFIER)
E124473E06
E143742E26
Tester Connection Condition Specified Condition
A1-2 - A9-32 (TAM) Always Below 1
A1-1 - A9-24 (SG-6) Always Below 1
A9-32 (TAM) - Body
groundAlways 10 k or higher
A9-24 (SG-6) - Body
groundAlways 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE A/C AMPLIFIER

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–33
AC
DESCRIPTION
The evaporator temperature sensor (A/C thermistor) is installed on the evaporator in the air conditioning
unit. It detects the temperature of the cooled air that has passed through the evaporator and its signal is
used to control the air conditioning. It sends a signal to the A/C amplifier. The resistance of the evaporator
temperature sensor (A/C thermistor) changes in accordance with the temperature of the cooled air that
has passed through the evaporator. As the temperature decreases, the resistance increases. As the
temperature increases, the resistance decreases.
The A/C amplifier applies voltage (5 V) to the evaporator temperature sensor (A/C thermistor) and reads
voltage changes as the resistance of the evaporator temperature sensor (A/C thermistor) changes. This
sensor is used to prevent the evaporator from freezing.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
intelligent tester main switch on.
(c) Select the item below in the DATA LIST, and read the
display on the intelligent tester.
DATA LIST / AIR CONDITIONER:
DTC B1413/13 Evaporator Temperature Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1413/13 Open or short in evaporator temperature sensor circuit• Evaporator temperature sensor
• Harness or connector between evaporator
temperature sensor and A/C amplifier
• A/C amplifier
1READ VALUE OF INTELLIGENT TESTER
I035354E03
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
EVAP TEMP
(Evaporator thermistor)Evaporator thermistor / min.: -
29.7
C (-21.46F), max.: 59.55C
(139.19F)Actual evaporator temperature is
displayed-

AC–34AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
OK:
The display is as specified in the normal condition
column.
Result
B
C
A
(a) Disconnect the connector from the evaporator
temperature sensor.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NOTICE:
• Even slightly touching the sensor may change the
resistance value. Be sure to hold the connector of
the sensor.
• When measuring, the sensor temperature must be
the same as the evaporator temperature.
HINT:
As the temperature increases, the resistance decreases
(see the graph).
NG
OK
Result Proceed to
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B
OK (When troubleshooting according to the DTC) C
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
REPLACE A/C AMPLIFIER
2INSPECT EVAPORATOR TEMPERATURE SENSOR
E148014E02
Tester Connection Condition Specified Condition
A12-1 - A12-2 -10
C (14F) 7.30 to 9.10 k
A12-1 - A12-2 -5C (23F) 5.65 to 6.95 k
A12-1 - A12-2 0C (32F) 4.40 to 5.35 k
A12-1 - A12-2 5C (41F) 3.40 to 4.15 k
A12-1 - A12-2 10C (50F) 2.70 to 3.25 k
A12-1 - A12-2 15C (59F) 2.14 to 2.58 k
A12-1 - A12-2 20C (68F) 1.71 to 2.05 k
A12-1 - A12-2 25C (77F) 1.38 to 1.64 k
A12-1 - A12-2 30C (86F) 1.11 to 1.32 k
REPLACE EVAPORATOR TEMPERATURE
SENSOR

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–35
AC
(a) Disconnect the evaporator temperature sensor
connector.
(b) Disconnect the A/C amplifier connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
3CHECK HARNESS AND CONNECTOR (EVAPORATOR TEMPERATURE SENSOR - A/C
AMPLIFIER)
E124472E09
E143742E34
Tester Connection Condition Specified Condition
A9-34 (TE) - A12-2 Always Below 1
A9-22 (SG-4) - A12-1 Always Below 1
A9-34 (TE) - Body
groundAlways 10 k or higher
A9-22 (SG-4) - Body
groundAlways 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE A/C AMPLIFIER

AC–36AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
The rear evaporator temperature sensor is installed on the rear evaporator. It detects the rear evaporator
temperature. The sensor sends a signal to the A/C amplifier. The resistance of the rear evaporator
temperature sensor changes in accordance with the rear evaporator temperature. As the temperature
decreases, the resistance increases. As the temperature increases, the resistance decreases.
The A/C amplifier applies voltage (5 V) to the rear evaporator temperature sensor and reads voltage
changes as the resistance of the rear evaporator temperature sensor changes.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
intelligent tester main switch on.
DTC B1417/17 Rear Evaporator Temperature Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1417/17Open or short in rear evaporator temperature sensor
circuit• Rear evaporator temperature sensor
• Harness or connector between rear evaporator
temperature sensor and A/C amplifier
• A/C amplifier
1READ VALUE OF INTELLIGENT TESTER
I008282E19

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–37
AC
(c) Select the item below in the DATA LIST, and read the
display on the intelligent tester.
DATA LIST / AIR CONDITIONER:
OK:
The display is as specified in the normal condition
column.
Result
B
C
A
(a) Remove the rear evaporator temperature sensor.
(b) Measure the resistance according to the value(s) in the
table below.
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
R-EVAP TEMP SEN
(Rear evaporator temperature
sensor)Rear evaporator temperature
sensor / min: -29.7
C (-21.46F),
max: 59.55
C (139.19F)Actual rear evaporator
temperature is displayed-
Result Proceed to
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B
OK (When troubleshooting according to the DTC) C
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
REPLACE A/C AMPLIFIER
2INSPECT REAR EVAPORATOR TEMPERATURE SENSOR
E112577E07

AC–38AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
Standard resistance
NOTICE:
• Even slightly touching the sensor may change the
resistance value. Be sure to hold the connector of
the sensor.
• When measuring, the sensor temperature must be
the same as the rear evaporator temperature.
HINT:
As the temperature increases, the resistance decreases
(see the graph).
NG
OK
I040629E04
Tester Connection Condition Specified Condition
A26-1 - A26-2 -10
C (14F) 7.40 to 9.20 k
A26-1 - A26-2 -5C (23F) 5.65 to 7.00 k
A26-1 - A26-2 0C (32F) 4.35 to 5.40 k
A26-1 - A26-2 5C (41F) 3.40 to 4.20 k
A26-1 - A26-2 10C (50F) 2.68 to 3.30 k
A26-1 - A26-2 15C (59F) 2.10 to 2.60 k
A26-1 - A26-2 20C (68F) 1.66 to 2.10 k
A26-1 - A26-2 25C (77F) 1.32 to 1.66 k
A26-1 - A26-2 30C (86F) 1.05 to 1.35 k
REPLACE REAR EVAPORATOR
TEMPERATURE SENSOR

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–39
AC
(a) Disconnect the rear evaporator temperature sensor
connector.
(b) Disconnect the A/C amplifier connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
3CHECK HARNESS AND CONNECTOR (REAR EVAPORATOR TEMPERATURE SENSOR -
A/C AMPLIFIER)
E124472E10
E141047E07
Tester Connection Condition Specified Condition
A26-2 - A10-17 (TEC) Always Below 1
A26-1 - A10-13 (SG) Always Below 1
A10-17 (TEC) - Body
groundAlways 10 k or higher
A10-13 (SG) - Body
groundAlways 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE A/C AMPLIFIER

AC–244AIR CONDITIONING – EVAPORATOR TEMPERATURE SENSOR
AC
EVAPORATOR TEMPERATURE
SENSOR
ON-VEHICLE INSPECTION
1. INSPECT A/C EVAPORATOR TEMPERATURE
SENSOR
(a) Remove the A/C evaporator temperature sensor (A/
C thermistor).
(b) Disconnect the connector from the A/C evaporator
temperature sensor (A/C thermistor).
(c) Measure the resistance according to the value(s) in
the table below.
Standard resistance
NOTICE:
• Even slightly touching the sensor may
change the resistance 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).
If the resistance is not as specified, replace the A/C
evaporator temperature sensor (A/C thermistor).
E148014E01
Tester connection Condition Specified condition
1 - 2 -10
C (14F) 7.30 to 9.10 k
1 - 2 -5C (23F) 5.65 to 6.95 k
1 - 2 0C (32F) 4.40 to 5.35 k
1 - 2 5C (41F) 3.40 to 4.15 k
1 - 2 10C (50F) 2.70 to 3.25 k
1 - 2 15C (59F) 2.14 to 2.58 k
1 - 2 20C (68F) 1.71 to 2.05 k
1 - 2 25C (77F) 1.38 to 1.64 k
1 - 2 30C (86F) 1.11 to 1.32 k