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 recirculation damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or 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 trouble code may be stored when either a damper link or damper is mechanically locked.

DTC Code DTC Detection Condition Trouble Area
B1442/42 The air inlet damper position does not change when the air conditioning amplifier assembly operates the recirculation damper servo sub-assembly.

  • Recirculation damper servo sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A009BDJE51

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (RECIRCULATION DAMPER SERVO)


    1. Use the Data List to check if the recirculation damper servo sub-assembly is functioning properly Click here.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly target pulse / Min.: 0, Max.: 255

      7 (pulse): Recirculation

      28 (pulse): Fresh

      		 -
      Air Inlet Damper Actual Pulse Recirculation damper servo sub-assembly actual pulse / Min.: 0, Max.: 255

      7 (pulse): Recirculation

      28 (pulse): Fresh

      		 -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      OK (When troubleshooting according to problem symptoms table) A
      OK (When troubleshooting according to the DTC) B
      NG C

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (RECIRCULATION DAMPER SERVO) Click here

    A

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

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (RECIRCULATION DAMPER SERVO)


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the recirculation damper servo sub-assembly operates Click here.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly target pulse Min.: 0, Max.: 255 -
      OK
      Recirculation damper servo sub-assembly operates normally.

    NG

    REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  3. REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY


    1. Replace the recirculation damper servo sub-assembly Click here.

      Tech Tips

      Since the recirculation damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the recirculation damper servo sub-assembly with a new or normally functioning one.


    NEXT

  4. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1442 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    END (RECIRCULATION DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

  5. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one Click here.


    NEXT

  6. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1442 is not output.

    NG

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)