AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1442/42

DTC Code DTC Name
B1442/42 Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The air inlet control servo motor sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air inlet damper to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION and RECIRCULATION).

Tech Tips

Confirm that no mechanical problem is present because this diagnostic trouble code can be output when either a damper link or damper is mechanically locked.

DTC No, DTC Detection Condition Trouble Area
B1442/42 Air inlet damper position sensor value does not change even if air conditioning amplifier operated air inlet control servo motor

  • Air inlet control servo motor

  • Air conditioning harness

  • Air conditioning amplifier

WIRING DIAGRAM

A011AKVE38

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (AIR INLET DAMPER TARGET PULSE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

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

    5. According to the display on the intelligent tester, read the Data List.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Inlet Damper Target Pulse

      Air inlet damper target pulse /

      Min.: 0

      Max.: 255

      for LHD

      RECIRCULATION: 45 (pulse)

      FRESH: 30 (pulse)

      for RHD

      RECIRCULATION: 16 (pulse)

      FRESH: 32 (pulse)

      		 -
      OK
      The display is as specified in the normal condition.
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to the Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC output) C

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    A

  2. REPLACE AIR INLET CONTROL SERVO MOTOR


    1. Temporarily replace the air inlet control servo motor with a new one Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new one and check that the condition returns to normal.


    NEXT

  3. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Check for DTC Click here.

      OK
      DTC is not output.

    NG

    REPAIR OR REPLACE AIR CONDITIONING HARNESS Click here

    OK

    END (AIR INLET CONTROL SERVO MOTOR IS FAULTY)

  4. REPAIR OR REPLACE AIR CONDITIONING HARNESS


    1. Repair or replace the air conditioning harness Click here.


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Check for DTC again Click here.

      OK
      DTC is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    END