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, reverse) based on the signals to move the air inlet mode selection recirculation damper servo sub-assembly to any position, which controls the air inlet mode (fresh, fresh/recirculation, and recirculation).

The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1442/42

Air Inlet Damper Control Servo Motor Circuit

Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates recirculation damper servo sub-assembly

  • Recirculation damper servo sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

Memorized

(30 sec. or more)*1

  • *1: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

E265642E06

CAUTION / NOTICE / HINT

Tip:

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

PROCEDURE

  1. READ VALUE USING GTS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Operate the recirculation/fresh switch.

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

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

      Body Electrical > Air Conditioner > Data List

      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

      • for LHD:

      • RECIRCULATION: 19 (pulse)

      • FRESH: 7 (pulse)

      • for RHD:

      • RECIRCULATION: 7 (pulse)

      • FRESH: 25 (pulse)

      -

      Body Electrical > Air Conditioner > Data List

      Tester Display

      Air Inlet Damper Targ Pulse

      OK

      The display is as specified in the normal condition column.

    Result

    Result

    Proceed to

    OK (When troubleshooting according to the DTC)

    A

    OK (When troubleshooting according to Problem Symptoms Table)

    B

    NG

    C
    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick hereClick hereClick hereClick hereClick here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click hereClick hereClick hereClick here

    A

  2. REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY

    1. Replace the recirculation damper servo sub-assembly.

      Click hereClick here

      Tip:

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

    2. Check for the DTC.

      Body Electrical > Air Conditioner > Trouble Codes

      Result

      Result

      Proceed to

      DTC B1442/42 is output

      A

      DTC B1442/42 is not output

      B
    B

    END (RECIRCULATION DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    A

  3. REPLACE AIR CONDITIONING HARNESS ASSEMBLY

    1. Replace the air conditioning harness assembly.

      Click hereClick hereClick hereClick hereClick hereClick here

      Tip:

      Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

    2. Check for the DTC.

      Body Electrical > Air Conditioner > Trouble Codes

      Result

      Result

      Proceed to

      DTC B1442/42 is output

      A

      DTC B1442/42 is not output

      B
    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click hereClick hereClick hereClick here

    B

    END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)