Toyota RAV4 manuals

Toyota RAV4 Service Manual: Compressor lock sensor circuit

Toyota RAV4. Compressor lock sensor circuit


Description

This sensor sends 1 pulse per engine revolution to the air conditioning amplifier. If the ratio of the compressor speed divided by the engine speed is smaller than a predetermined value, the air conditioning amplifier turns the compressor off, and the indicator blinks at approximately 1 second intervals.

Toyota RAV4. Compressor lock sensor circuit


Wiring diagram

Toyota RAV4. Compressor lock sensor circuit


Inspection procedure

  1. Check air conditioning amplifier (lock signal)

Toyota RAV4. Check air conditioning amplifier (lock signal)


  1. Remove the air conditioning amplifier with its connectors still connected.
  2. Check the waveform of the amplifier connector.

Ok: waveform is as shown in the illustration.


Toyota RAV4. Check air conditioning amplifier (lock signal)



  1. Inspect compressor lock sensor

Toyota RAV4. Inspect compressor lock sensor


  1. Disconnect the b47 compressor lock sensor connector.
  2. Measure the resistance of the sensor.

Standard resistance



  1. Check wire harness (compressor lock sensor - air conditioning amplifier)

Toyota RAV4. Check wire harness (compressor lock sensor - air conditioning amplifier)


  1. Disconnect the b47 compressor lock sensor connector.
  2. Disconnect the e37 amplifier connector.
  3. Measure the resistance of the wire harness side connectors.

Standard resistance



Replace air conditioning amplifier

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