Click here

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

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

DESCRIPTION

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

Tip:

Confirm that there are no mechanical problems because this DTC can be set ifeither a damper link or damper is mechanically locked.

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

  • Air inlet control servo motor

  • Air conditioning harness

  • Air conditioning amplifier
Click here

WIRING DIAGRAM

Click here

INSPECTION PROCEDURE

Click here

PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (A/I DAMP TARG PLS)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG) and turn the intelligent tester main switch on.

    3. Select the item below in the Data List, and read the value displayed on the intelligent tester.

      Table 1. Data List / Air Conditioner:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/I Damp Targ Pls

      Air inlet damper target pulse /

      Min.: 0, Max.: 255

      RECIRCULATION: 7 (pulse)

      FRESH: 28 (pulse)

      		 -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      NG A
      OK (Checking from PROBLEM SYMPTOMS TABLE) B
      OK (Checking from DTC) C

  2. Click here

    REPLACE AIR INLET CONTROL SERVO MOTOR

    Tip:

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

    OK
    Same problem does not occur.

  3. Click here

    CHECK DTC OUTPUT


    1. Check for DTC.

      OK
      DTC B1442/42 is not output.

  4. Click here

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  5. Click here

    REPLACE AIR CONDITIONING AMPLIFIERClick here

  6. Click here

    REPAIR OR REPLACE AIR CONDITIONING HARNESS

  7. Click here

    END