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Section 555 (Air Conditioning System - Diagnostics): Pre-Check

WARNING: This page is about a different car, the 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. WARNING FOR A/C COMPRESSOR LOCK 

    If compressor lock occurs during A/C operation, the A/C switch indicator on the A/C control assembly starts blinking.

    When this occurs, check for compressor lock (DTC 22) using diagnosis trouble code check then proceed to inspect the circuit or the component.

    Compressor lock sensor circuit. --> (See DTC 22 COMPRESSOR LOCK SENSOR CIRCUIT )

    Fig 1: Identifying A/C Switch Indicator On A/C Control Assembly Blinking Pattern
    G02839012Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. LIST OF OPERATION METHODS 

    By operating each of the A/C control switches as shown in the diagram below, it is possible to enter the diagnosis check mode.

    Fig 2: Operation Methods Flowchart
    G02839013Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INDICATOR CHECK 
    1. Turn the ignition switch to on while pressing the A/C control AUTO switch and R/F SW simultaneously.
      Fig 3: Identifying A/C Control Auto Switch And R/F SW
      G02839014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that all the indicators light up and go off at 1 second intervals 4 times in succession.
      3. Fig 4: Identifying Indicator Check Blinking Pattern
      G02839015Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE:
    • After the indicator check is ended, the diagnostic trouble code check begins automatically.
      • Fig 5: Identifying Trouble Code Display
      G02839016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Press the OFF switch when desiring to cancel the check mode.
  4. DTC CHECK (SENSOR CHECK) 
    1. Perform an indicator check. After the indicator check is completed, the system enters the DTC check mode automatically.
    2. Read the DTC displayed on the panel. Refer to the list of DTCs in DIAGNOSTIC TROUBLE CODE CHART  when reading the DTCs (DTCs are out put at the temperature display.).

      If the slower display is desired, press the DEF. SW and change it to step operation. Each time the Temp. Control switch is pressed, the display changes by 1 step.

    Fig 6: Identifying DEF Switch
    G02839017Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. CLEARING DTC 
    1. Pull out the DOME fuse in engine room J/B for 10 sec. or longer to clear diagnostic the DTC's memory.
    2. After reinserting the fuse, check that the normal code is output.
    Fig 7: Locating DOME Fuse In Engine Room J/B
    G02839018Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. CHECK DLC3 

    The vehicle's ECM uses the ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

    Fig 8: Identifying DLC3 Terminals
    G02839019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 9: Voltage/Resistance Reference Chart
    G02839020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. DATA LIST 
    NOTE: According to the DATA LIST displayed by the TOYOTA Hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one of the method to shorten the labor time.
    1. Connect the TOYOTA Hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. According to the display on tester, read the "DATA LIST".
    Fig 10: Data List
    G02839021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. ACTIVE TEST 
    NOTE: Performing the ACTIVE TEST using the TOYOTA Hand-Held tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the method to shorten the labor time.

    It is possible to display the DATA LIST during the ACTIVE TEST.

    1. Connect the TOYOTA Hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. According to the display on tester, read the "ACTIVE TEST".
    ACTIVE TEST

    Item Test Details Diagnostic Note
    A/C MAG CLUTCH Control The A/C Magnet Clutch ON/OFF -
  9. ACTUATOR CHECK 
    1. After entering the sensor check mode, press the R/F switch.
      2. Fig 11: Identifying R/F SW
      G02839022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Since each damper, motor and relay automatically operates at 1 second intervals beginning in order from 20 in the temperature display, check the temperature and air flow visually and by hand.

      If a slower display is desired, press the DEF. (Fr.) switch and change it to step operation. Each time the DEF. (Fr.) switch is pressed, the display changes by 1 step.

      Fig 12: Identifying DEF SW
      G02839023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE:
    • Code are displayed in order from the smaller to the larger numbers.
    • To cancel the check mode, press the OFF switch.
    Fig 13: Air Conditioning System Display Code Chart
    G02839024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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