Toyota RAV4 manuals

Toyota RAV4 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

Diagnostic trouble code chart (2006/01- )
Hint: When the air conditioning system functions properly, dtc b1400/00 is output. Hint: *1: Dtc b1422/22 (compressor lock sensor circuit) is indicated only for a currently occurring malfunct ...

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:

On-vehicle inspection
Notice: Perform the maf meter inspection according to the procedures below. Only replace the maf meter when both the long ft#1 value and maf value in the data list (with the engine stopped) are not within the normal operating range. Inspect mass air flow meter Perform c ...

If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs adjustment or repair. Contact your toyota dealer as soon as possible. Visible symptoms Fluid leaks under the vehicle (water dripping from the air conditioning after use is normal.) Flat-looking tires or uneven tire w ...

Dtc check / clear
Notice: When the diagnosis system is changed from normal mode to check mode or vice versa, all dtcs and freeze frame data recorded in normal mode are erased. Before changing modes, always check and make a note of any dtcs and freeze frame data. Hint: Dtcs which are stored in the ecm can be ...

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