Toyota RAV4 manuals

Toyota RAV4 Service Manual: Room temperature sensor circuit

Toyota RAV4. 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 temperature sensor changes in accordance with the room 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 room temperature sensor and reads voltage changes as changes in the resistance of the room temperature sensor.

Toyota RAV4. Room temperature sensor circuit


Wiring diagram

Toyota RAV4. Wiring diagram


Inspection procedure

  1. Read value of intelligent tester (room 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 (room temp)


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

Toyota RAV4. Read value of intelligent tester (room temp)




  1. Inspect cooler thermistor (room temperature sensor)

Toyota RAV4. Inspect cooler thermistor (room temperature sensor)


  1. Remove the room 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 (room temperature sensor - air conditioning amplifier)

Toyota RAV4. Check wire harness (room temperature sensor - air conditioning amplifier)


  1. Disconnect the e21 sensor connector.
  2. Disconnect the e37 amplifier connector.
  3. Measure the resistance of the wire harness side connectors.

Standard resistance




Replace air conditioning amplifier assembly

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 malf ...

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 c ...

Other materials:

Diagnosis system
Description Air conditioning system data and the diagnostic trouble codes (dtcs) can be read through the data link connector 3 (dlc3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform troubleshooting. ...

Throttle / pedal position sensor / switch "A" circuit range / performance problem
Hint: This dtc relates to the throttle position (tp) sensor. Description Refer to dtc p0120 (see page es-114). Monitor description The ecm uses the tp sensor to monitor the throttle valve opening angle. This sensor transmits two signals: vta1 and vta2. Vta1 is used to detect the th ...

Occupant classification ecu malfunction
Description Dtc b1795 is recorded when a malfunction is detected in the occupant classification ecu. Troubleshoot dtc b1771 first when dtc b1771 and b1795 are output simultaneously. Wiring diagram Inspection procedure Check for dtc Turn the ignition switch on, and wait ...

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