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Home >> Toyota >> 2007 >> Avalon Touring >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning >> Air Conditioning System >> Compressor Circuit >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER 
    1. Connect the intelligent tester to DLC3.
    2. Turn the ignition switch on (IG) and push the intelligent tester main switch on.
    3. Select the item below in the ACTIVE TEST and then check that the relay operates.

    DATA LIST / AIR CONDITIONER: 

    MEASURE ITEM / DISPLAY (RANGE) AND DIAGNOSTIC NOTE

    Item Measurement Item / Display (Range) Diagnostic Note
    A/C MAG CLUTCH Magnetic clutch relay / OFF, ON -

    NG:  Go to step  2

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

  2. INSPECT FUSE (A/C COMP) 
    1. Remove the A/C COMP fuse from the instrument panel J/B.
      2. Fig 1: Identifying A/C COMP Fuse Location
      G05004801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE SPECIFICATIONS

      Tester item Condition Specified condition
      A/C COMP fuse Always Below 1 Ω

    NG: REPLACE FUSE (A/C COMP) 

    OK: Go to Next Step 

  3. INSPECT MAGNETIC CLUTCH RELAY 
    1. Remove the MG CLT relay (magnetic clutch relay) from engine room R/B and J/B.
      2. Fig 2: Inspecting Magnetic Clutch Relay
      G05004802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE SPECIFICATIONS

      Tester connection Condition Specified condition
      3 - 5 Always 10 kΩ or higher
      3 - 5 When Battery voltage is applied to terminals 1 and 2 Below 1 Ω (When Battery voltage is applied to terminals 1 and 2)
      NOTE: While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.

    NG: REPLACE MAGNETIC CLUTCH RELAY 

    OK: Go to Next Step 

  4. INSPECT W/MAGNETIC CLUTCH COMPRESSOR ASSEMBLY 
    1. Disconnect the connector from the w/ magnet clutch compressor assembly.
      2. Fig 3: Magnetic Clutch Compressor Assembly Connector Front View
      G05004803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE SPECIFICATIONS

      Tester connection Condition Specified condition
      B8-3 (MG+) - Body Ground Always Below 1 Ω

    NG: REPLACE W/MAGNETIC CLUTCH COMPRESSOR ASSEMBLY 

    OK: Go to Next Step 

  5. INSPECT AIR CONDITIONING AMPLIFIER 
    1. Remove the A/C amplifier and disconnect the connector.
    2. Turn the ignition switch on (IG).
      3. Fig 4: Air Conditioning Amplifier Connector Wire Harness Side
      G05004804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Voltage 

      VOLTAGE SPECIFICATIONS

      Tester connection Condition Specified condition
      D37-3 (MGC)- Body ground Magnet clutch: ON Below 1 V
      D37-3 (MGC)- Body ground Magnet clutch: OFF 10 to 14 V

    Result 

    RESULT DESCRIPTION

    Result Proceed to
    NG A
    OK (w/o Smart key system) B
    OK (w/Smart key system) C

    B: GO TO STARTING SYSTEM STARTING SYSTEM 

    C: GO TO PUSH BUTTON START SYSTEM SYSTEM DESCRIPTION 

    A: REPLACE AIR CONDITIONING AMPLIFIER 

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