Toyota RAV4 manuals

Toyota RAV4 Service Manual: Evaporator temperature sensor circuit

Toyota RAV4. 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 through the evaporator and to control the air conditioner. It sends signals to the air conditioning amplifier. The signals change in accordance with the resistance of the no. 1 Cooler thermistor (evaporator temperature sensor). 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 no. 1 Cooler thermistor (evaporator temperature sensor) and reads voltage changes as changes in the resistance of the no. 1 Cooler thermistor (evaporator temperature sensor). This sensor is used for frost prevention.

Toyota RAV4. Evaporator temperature sensor circuit


Wiring diagram

Toyota RAV4. Evaporator temperature sensor circuit


Inspection procedure

  1. Read value of intelligent tester (evap fin temp)

  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 (evap fin temp)


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

Toyota RAV4. Read value of intelligent tester (evap fin temp)



  1. Inspect no. 1 Cooler thermistor (evaporator temperature sensor)

Toyota RAV4. Inspect no. 1 Cooler thermistor (evaporator temperature sensor)


  1. Remove the no. 1 Cooler thermistor.
  2. Measure the resistance of the thermistor.

Standard resistance


Notice:

Hint:

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



  1. Check wire harness (no. 1 Cooler thermistor - air conditioning amplifier)

Toyota RAV4. Check wire harness (no. 1 Cooler thermistor - air conditioning amplifier)


  1. Disconnect the e33 no. 1 Cooler thermistor connector.
  2. Disconnect the e36 amplifier connector.
  3. Measure the resistance of the wire harness side connectors.

Standard resistance




Replace air conditioning amplifier

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