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 No. 1 blower 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 No. 1 blower damper servo sub-assembly to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION, and RECIRCULATION).

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
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 No. 1 blower damper servo sub-assembly

  • No. 1 blower damper servo sub-assembly

  • No. 1 air conditioning radiator damper servo sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

 Memorized (30 seconds or more) -

Tech Tips

The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the parentheses.

WIRING DIAGRAM

B003ND0E01

CAUTION / NOTICE / HINT

Note


  • When DTC B1441/41, B1442/42 and B1443/43 are output at same time, the No. 1 air conditioning radiator damper servo sub-assembly is malfunctioning.

  • When the servo motor or air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

    Click here

Tech Tips

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

PROCEDURE


  1. READ VALUE USING GTS (AIR INLET DAMPER TARG PULSE, AIR INLET DAMPER ACTUAL PULSE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    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 No. 1 blower damper servo sub-assembly (recirculation) target pulse

      Min.: 128

      Max.: 383

      Recirculation: 258 (pulse)

      Fresh: 235 (pulse)

      		 No. 1 blower damper servo sub-assembly (recirculation) system malfunction
      Air Inlet Damper Actual Pulse No. 1 blower damper servo sub-assembly (recirculation) actual pulse

      Min.: 128

      Max.: 383

      Recirculation: 258 (pulse)

      Fresh: 235 (pulse)

      		 No. 1 blower damper servo sub-assembly (recirculation) system malfunction

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Air Inlet Damper Targ Pulse
      Air Inlet Damper Actual Pulse
      OK
      When the recirculation/fresh switch is turned to recirculation mode or fresh mode, the actual pulse changes following the target pulse.
      Result
      Result Proceed to
      Target pulse and actual pulse do not change A
      Target pulse changes but actual pulse does not change B
      Actual pulse changes following the target pulse (When troubleshooting according to the DTC) C
      Actual pulse changes following the target pulse (When troubleshooting according to Problem Symptoms Table) D

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    CHECK FOR DTC Click here

    D

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

    B

  2. CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 blower damper servo sub-assembly.

      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 or known good one and check that the condition returns to normal.

    2. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1442/42 is not output
      Result
      Proceed to
      OK
      NG

    OK

    END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY IS DEFECTIVE)

    NG

  3. CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 air conditioning radiator damper servo sub-assembly.

      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 or known good one and check that the condition returns to normal.

    2. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1442/42 is not output
      Result
      Proceed to
      OK
      NG

    OK

    END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY IS DEFECTIVE)

    NG

  4. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly.

      Click here

      Tech Tips

      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. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1442/42 is not output
      Result
      Proceed to
      OK
      NG

    OK

    END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  5. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B1442/42 is not output
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here