AIR CONDITIONING SYSTEM (for Manual Air Conditioning System) DATA LIST / ACTIVE TEST


  1. DATA LIST

    Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

    Note

    In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.


    1. Connect the Techstream to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    5. Check the value(s) by referring to the table below.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Ambient Temp Sensor

      Ambient temperature sensor (Thermistor assembly) /

      Min.: -23.30°C (-9.94°F)

      Max.: 65.95°C (150.71°F)

      		 Actual ambient temperature displayed -
      Adjusted Ambient Temp

      Adjusted ambient temperature /

      Min.: -30.80°C (-23.44°F)

      Max.: 50.80°C (123.44°F)

      		 - -
      Evaporator Fin Thermistor

      Evaporator temperature sensor (No. 1 cooler thermistor) /

      Min.: -29.70°C (-21.46°F)

      Max.: 59.55°C (139.19°F)

      		 Actual evaporator temperature displayed -
      Evaporator Target Temp

      Evaporator target temperature /

      Min.: -327.68°C (-557.82°F)

      Max.: 327.67°C (621.81°F)

      		 Evaporator target temperature displayed -
      Engine Coolant Temp

      Engine coolant temperature sensor /

      Min.: 1.30°C (34.34°F)

      Max.: 90.55°C (194.99°F)

      		 Actual engine coolant temperature displayed -
      Blower Motor Speed Level

      Blower motor speed level /

      Min.: 0

      Max.: 31

      		 Displayed speed level increases in range between 0 and 31 as blower motor speed increases -
      Regulator Pressure Sensor

      Air conditioning pressure sensor /

      Min.: -66.22 psi (gauge)

      Max.: 477.68 psi (gauge)

      		 Actual pressure is displayed -
      Regulator Control Current

      Solenoid valve control current /

      Min.: 0 A

      Max.: 0.997 A

      		 Value changes between 0 A and 0.997 A in accordance with solenoid valve operation -
      Air Mix Servo Targ Pulse(D)

      No. 1 air conditioning radiator damper servo sub-assembly (air mix) target pulse /

      Min.: 0

      Max.: 255

      MAX. COLD: 105 (pulse)

      MAX. HOT: 7 (pulse)

      		 -
      Air Mix Servo Actual Pulse(D)

      No. 1 air conditioning radiator damper servo sub-assembly (air mix) actual pulse /

      Min.: 0

      Max.: 255

      MAX. COLD: 105 (pulse)

      MAX. HOT: 7 (pulse)

      		 -
      Air Outlet Servo Pulse (D)

      No. 1 air conditioning radiator damper servo sub-assembly (air outlet) target pulse /

      Min.: 0

      Max.: 255

      FACE: 8 (pulse)

      B/L: 30 (pulse)

      FOOT (except MAX. HOT): 67 (pulse)

      FOOT (MAX. HOT): 74 (pulse)

      FOOT/DEF: 80 (pulse)

      DEF: 97 (pulse)

      		 -
      Air Outlet Servo Actu Pulse(D)

      No. 1 air conditioning radiator damper servo sub-assembly (air outlet) actual pulse /

      Min.: 0

      Max.: 255

      FACE: 8 (pulse)

      B/L: 30 (pulse)

      FOOT (except MAX. HOT): 67 (pulse)

      FOOT (MAX. HOT): 74 (pulse)

      FOOT/DEF: 80 (pulse)

      DEF: 97 (pulse)

      		 -
      Air Inlet Damper Targ Pulse

      No. 1 blower damper servo sub-assembly (air inlet) target pulse /

      Min.: 0

      Max.: 255

      RECIRCULATION: 7 (pulse)

      FRESH: 28 (pulse)

      		 -
      Air Inlet Damper Actual Pulse

      No. 1 blower damper servo sub-assembly (air inlet) actual pulse /

      Min.: 0

      Max.: 255

      RECIRCULATION: 7 (pulse)

      FRESH: 28 (pulse)

      		 -
      Evaporator Control

      Evaporator Control /

      Auto or Manual

      		 Customized value displayed -
      Refrigerant Shortage Check

      Refrigerant shortage check /

      ON, OFF

      		 Customized value displayed -
      Pls Servo Test Sts

      Pulse servo motor test status/

      Wait, Move, Comp, Error, Stop

      		 Pulse servo motor test status -
      Flow Sensor

      Flow sensor /

      Min.: 0.0 V

      Max.: 5.0 V

      A/C on, Blower switch HI: 0.7 to 3.8 V

      A/C off, Blower switch off: 3.8 to 4.2 V

      		 Flow sensor is malfunctioning when a constant value between 0.7 and 4.2 V is displayed continuously for more than 4 seconds.
      A/C Cutoff Signal

      A/C control cutoff signal /

      OFF or ON

      A/C switch on: OFF

      A/C switch off: ON

      		 -
      Outside Air Mode Auto Switch Function

      Outside air mode auto switch function /

      ON or OFF

      		 Customized value displayed -
      Number of Trouble Codes

      Number of trouble codes /

      Min.: 0

      Max.: 255

      		 Number of DTCs displayed -

  2. ACTIVE TEST

    Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.


    1. Connect the Techstream to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Check the operation by referring to the table below.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Blower Motor Blower with fan motor sub-assembly Min.: 0, Max.: 31 -
      Magnetic Clutch Relay A/C system operation OFF, ON -
      Defogger Relay (Rear) Defogger relay (engine room junction block assembly) OFF, ON -
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (air mix) pulse Min.: 0, Max.: 255 Operates between 7 and 105 pulses
      Air Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (air outlet) pulse Min.: 0, Max.: 255 Operates between 8 and 97 pulses
      Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly (air inlet) pulse Min.: 0, Max.: 255 Operates between 7 and 28 pulses