Toyota RAV4 manuals

Toyota RAV4 (XA40) 2013-2018 Service Manual: Ambient temperature sensor circuit

Toyota RAV4. Ambient temperature sensor circuit


Description

The ambient temperature sensor is installed in the front part of the condenser to detect the ambient temperature and control the air conditioner. The sensor is connected to the combination meter and detects fluctuations in the ambient temperature. This data is used for controlling the room temperature.

The sensor sends a signal to the air conditioning amplifier via the combination meter. The resistance of the ambient temperature sensor changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier applies a voltage (5 v) to the ambient temperature sensor and reads voltage changes as changes in the resistance of the ambient temperature sensor. The combination meter sends the read signal to the air conditioning amplifier via can communication.

Toyota RAV4. Ambient temperature sensor circuit


Wiring diagram

Toyota RAV4. Ambient temperature sensor circuit


Inspection procedure

  1. Read value of intelligent tester (ambi temp sens)

  1. Connect the intelligent tester (with can vim) to the dlc3.
  2. Turn the ignition switch on and turn the intelligent tester main switch on.
  3. Select the item below in the data list, and read the value displayed on the intelligent tester.

Toyota RAV4. Read value of intelligent tester (ambi temp sens)


Ok: the display is as specified in the normal condition column.

Toyota RAV4. Read value of intelligent tester (ambi temp sens)




  1. Inspect ambient temperature sensor

Toyota RAV4. Inspect ambient temperature sensor


  1. Remove the ambient temperature sensor.
  2. Measure the resistance of the sensor.

Standard resistance


Notice:

Hint:

As the temperature increases, the resistance decreases (see the graph).



  1. Check wire harness (ambient temperature sensor - combination meter)

Toyota RAV4. Check wire harness (ambient temperature sensor - combination meter)


  1. Disconnect the a17 sensor connector.
  2. Disconnect the e19 meter connector.
  3. Measure the resistance of the wire harness side connectors.

Standard resistance




Replace combination meter

Room temperature sensor circuit
Description The room temperature sensor is installed in the instrument panel to detect the room temperature and control the heater and air conditioner auto mode. The resistance of the room t ...

Evaporator temperature sensor circuit
Description The no. 1 Cooler thermistor (evaporator temperature sensor) is installed on the evaporator in the air conditioning unit to detect the temperature of the cooled air that has passed ...

Other materials:

Basic repair hint
Hints on operations 1 Attire Always wear a clean uniform. A hat and safety shoes must be worn. 2 Vehicle protection Prepare a grille cover, fender cover, seat cover and floor mat before starting the operation. 3 Safe opera ...

Passenger airbag on / off indicator circuit malfunction
Description The passenger airbag on / off indicator circuit consists of the center airbag sensor and the heater control panel*1 or *2. This circuit indicates the operation condition of the front passenger airbag, the front passenger side airbag and passenger side seat belt pretensioner ...

Exhaust gas precautions
Harmful substance to the human body is included in exhaust gases if inhaled. WARNING Exhaust gases contain harmful carbon monoxide (CO), which is colorless and odorless. Observe the following precautions. Failure to do so may cause exhaust gases to enter the vehicle and may lead to an accident caus ...

В© 2011-2025 Copyright www.trav4.net