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Air Conditioning System: Pre-Check

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
  1. LIST OF OPERATION METHODS 

    By operating each of the A/C control switches as shown in Fig 1 , it is possible to enter the diagnosis check mode.

    Fig 1: List Of Operation Methods Flow Chart
    G02629406Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INDICATOR CHECK 
    1. Turn the ignition switch ON while pressing the A/C control AUTO switch and R/F switch simultaneously.
      Fig 2: Pressing A/C Control AUTO Switch & R/F Switch Simultaneously
      G02629407Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the indicators come on and go off 4 times in succession at 1 second intervals.

      HINT:

      • After the indicator check is completed, the system enters the DTC mode automatically.
      • Press the OFF switch to cancel the check mode.
      Fig 3: Checking Indicators Come On & Go Off Blinking Patterns
      G02629408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. DTC CHECK (SENSOR CHECK) 
    1. After the indicator check is completed, the system enters the DTC check mode automatically.
    2. Read the codes displayed on the panel. Refer to the list of codes DIAGNOSTIC TROUBLE CODE TABLE  when reading the codes. (Trouble code are outputted at the temperature display.)
      Fig 4: Reading Codes Displayed On Panel
      G02629409Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. If the slower display is desired, press the DEF switch and change it to the step operation. Each time the DEF switch is pressed, the display changes by 1 step.
    Fig 5: Pressing DEF Switch To Step Operation
    G02629410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CLEARING DTC 
    1. To clear diagnostic trouble code, there are 2 ways.
      1. During sensor check, press the "DEF" switch and "A/C" switch at the same time.
      2. Pull the ECU-B fuse in engine room J/B for 20 seconds or longer to clear the DTC memory.
    Fig 6: Clearing DTC
    G02629411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. ACTUATOR CHECK 
    1. After entering the DTC check mode (Sensor Check Mode) press the R/F switch.
    2. As each damper, motor and relay automatically operate actuator check at 1 second intervals from step No. 1 to No. 10 continuously, check the temperature and air flow from visual and by hand.

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

    HINT:

    • Codes are displayed from the smaller to the larger numbers in order.
    • To cancel the check mode, press the OFF switch.
    Fig 7: Checking Actuator
    G02629412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 8: Actuator Display Code Table
    G02629413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. CHECK DLC3 
    1. The vehicle's engine and ECT ECU uses the ISO 9141-2 (Euro-OBD)/ISO 14230 (M-OBD) communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 9141-2/ISO 14230 format.
    Fig 9: Identifying Connector DLC3
    G02629414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    DLC TERMINAL REFERENCE

    Terminal No. Connection/Voltage or Resistance Condition
    7 Bus + Line/Pulse generation During transmission
    4 Chassis Ground - Body Ground/1 Ω or less Always
    5 Signal Ground - Body Ground/1 Ω or less Always
    16 Battery Positive - Body Ground/9 - 14 V Always
  7. DATA LIST 

    HINT:

    From to the DATA LIST displayed by hand-held tester, you can read the value on the display, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten the labor time.

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. From the display on tester, read the "DATA LIST".

    A.C.PID 

    DATA LIST (A.C.PID)

    Item Measurement Item/Display (Range) Normal Condition Diagnostic Note
    ROOM TEMP Room temperature sensor /min.: -6.5°C max.: 57.25°C Actual room temperature -
    AMBI TEMP SENS Ambient temperature sensor /min.: -23.3°C max.: 65.95°C Actual ambient temperature -
    AMBI TEMP Adjusted ambient temperature /min.: -30.8°C max.: 50.8°C - -
    EVAP TEMP Evaporator temperature sensor /min.: -29.7°C max.: 59.55°C Actual evaporator temperature -
    SOLAR SENS-D Solar sensor (D side) /min.: 0 max.: 1997 Changes depending on brightness (D side) -
    SOLAR SENS-P Solar sensor (P side) /min.: 0 max.: 1997 Changes depending on brightness (P side) -
    COOLANT TEMP Engine coolant temperature /min.: 1.3°C max.: 90.55°C Actual engine coolant temperature -
    SET TEMP-D Set temperature (D side) Celsius/ min.: 0, max. 30 Fahrenheit/ min.: 32, max.: 54 Actual set temperature (D side) -
    SET TEMP-P Set temperature (P side) Celsius/ min.: 0, max. 30 Fahrenheit/ min.: 32, max.: 54 Actual set temperature (P side) -
    ESTIMATE TEMP-D Estimated temperature (D side) /min.: -358.4°C max.: 358.4°C - -
    ESTIMATE TEMP-P Estimated temperature (P side) /min.: -358.4°C max.: 358.4°C - -
    A/M DAMP POS-D Air mix damper position (D side) /min.: -14% max.: 113.5% Changes depending on the set temperature (D side) -
    A/M DAMP POS-P Air mix damper position (P side) /min.: -14% max.: 113.5% Changes depending on the set temperature (P side) -
    A/I DAMP POS Air inlet damper position /min.: -14% max.: 113.5% Changes depending on air inlet power position -
    A/O DAMP POS Air outlet damper position /min.: -14% max.: 113.5% Changes depending on air outlet power position -
    A/M DAMP TARG-D Air mix damper target position (D side) /min.: -14% max.: 113.5% Changes depending on the set temperature (D side) -
    A/M DAMP TARG-P Air mix damper target position (P side) /min.: -14% max.: 113.5% Changes depending on the set temperature (P side) -
    A/I DAMP TARG Air inlet damper target position /min.: -14% max.: 113.5% Changes depending on air inlet power position -
    A/O DAMP TARG Air outlet damper target position /min.: -14% max.: 113.5% Changes depending on air outlet power position -
    BLOWER LEVEL Blower motor speed level /min.: Level 0 max.: Level 31 Changes depending on blower level -
    REAR ROOM TEMP Room temperature sensor (Rear) /min.: -6.5°C max.: 57.25°C Actual room temperature (Rear) -
    R-EVAP TEMP SEN Rr. EVAP temperature sensor (Rear) /min.: -29.7°C max.: 59.55°C Actual evaporator temperature (Rear) -
    SET TEMP REAR Set temperature (Rear) Celsius/ min.: 0, max. 30 Fahrenheit/ min.: 32, max.: 54 Actual set temperature -
    ESTIMATE TEMP-R Estimated temperature (Rear) /min.: -358.4°C max.: 358.4°C - -
    A/M DAMP POS-R Air mix damper position (Rear) /min.: -14% max.: 113.5% Changes depending on the set temperature (Rear) -
    A/O DAMP POS-R Air outlet mode damper position (Rear) /min.: -14% max.: 113.5% Changes depending on air outlet power position (Rear) -
    A/M DAMP TARG-R Air mix damper target position (Rear) /min.: -14% max.: 113.5% Changes depending on the set temperature (Rear) -
    A/O DAMP TARG-R Air outlet damper target position (Rear) /min.: -14% max.: 113.5% Changes depending on air outlet power position (Rear) -
    BLOWER LEVEL-R Blower motor speed level (Rear) /min.: Level 0 max: Level 31 Changes depending on blower level (Rear) -
    #CODES Number of Trouble Codes /min.: 0 max.: 255 - -
    SET TEMP SHIFT Shift set temperature Changes depending on shift set temperature *1 -
    AIR INLET MODE Air inlet mode Changes depending on air inlet mode *1 -
    COMPRESSOR MODE Compressor mode Changes depending on compressor mode *1 -
    COMPRS/DEF MODE Compressor/DEF operation mode Changes depending on compressor/ DEF operation mode *1 -
    FOOT/DEF OPER Foot/DEF auto mode Changes depending on Foot/ DEF auto mode *1 -
    AUTO BLOW UP Foot/DEF automatic blow up function Changes depending on Foot/ DEF automatic blow up function *1 -

    HINT:

    *1: It differs depending on the user setting.

  8. ACTIVE TEST 

    HINT:

    Performing the ACTIVE TEST USING HAND-HELD TESTER allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to shorten the labor time.

    It is possible to display the DATA LIST on the hand-held tester during the ACTIVE TEST.

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

    Item Test Details/Display (Range) Diagnostic Note
    BLOWER MOTOR Blower motor/min.: Level 0 max.: Level 31 -
    AIR MIX DAMP-D Air mix damper (D side) /min.: -14% max: 113.5% -
    AIR MIX DAMP-P Air mix damper (P side) /min.: -14% max: 113.5% -
    A/O MODE DAMP-D Air outlet damper position (D side) /min.: -14% max: 113.5% -
    A/I DAMP-LINEAR Air inlet damper position (linear) /min.: -14% max: 113.5% -
    REAR BLOWER Blower motor (Rear) -
    A/O MODE DAMP-R Air outlet damper position (Rear) /min.: -14% max: 113.5% -
    AIR MIX DAMP-R Air mix damper (Rear) /min.: -14% max: 113.5% -
    A/C MAG CLUTCH Magnetic clutch relay -
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