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

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

DESCRIPTION

The recirculation damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air inlet control damper to any position, which controls the intake air settings.

Tech Tips

This DTC is also output if the air inlet control damper and damper link are malfunctioning or unable to move properly. When this DTC is output, confirm that the mechanical parts of the damper and damper link are not defective or damaged.

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

  • Recirculation damper servo sub-assembly

  • Harness or connector

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01DZACE10

INSPECTION PROCEDURE

Note

When DTC 41, 42 and 43 are output at same time, there would be malfunctioning on power source circuit Click here.

PROCEDURE


  1. PERFORM ACTUATOR CHECK


    1. Remove the glove box to visually check the recirculation damper servo sub-assembly operation Click here.

    2. Enter actuator check mode Click here.

    3. Check that the air inlet control damper position changes according to the display code.

      Display Code Air Inlet Control Damper Position
      0 Fresh
      1 Fresh
      2

      Recirculation/fresh

      (50%)
      3 Recirculation
      4 Recirculation
      5 Fresh
      6 Fresh
      7 Recirculation
      8 Fresh
      9 Fresh
      OK
      Air inlet control damper position changes in accordance with each display code.

      Tech Tips

      The progression through the steps of the actuator check can be changed from automatic to manual by pressing the front DEF switch.

      Result
      Result Proceed to
      OK (When troubleshooting according to problem symptoms table.) A
      OK (When troubleshooting according to DTC.) B
      NG C

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    CHECK HARNESS AND CONNECTOR (RECIRCULATION DAMPER SERVO - AIR CONDITIONING AMPLIFIER) Click here

    A

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

  2. CHECK HARNESS AND CONNECTOR (RECIRCULATION DAMPER SERVO - AIR CONDITIONING AMPLIFIER)


    1. Disconnect the D15 recirculation damper servo sub-assembly connector.

    2. Disconnect the A44 and A46 air conditioning amplifier assembly connectors.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      D15-4 - A44-22 (AIR) Always Below 1 Ω
      D15-5 - A44-23 (AIF)
      D15-2 - A46-17 (PIA)
      D15-3 - A46-16 (PIB)
      D15-1 - A46-21 (SG-7)
      D15-4 - Body ground Always 10 kΩ or higher
      D15-5 - Body ground
      D15-2 - Body ground
      D15-3 - Body ground
      D15-1 - Body ground
      for LHD
      Tester Connection Condition Specified Condition
      D15-5 - A44-22 (AIR) Always Below 1 Ω
      D15-4 - A44-23 (AIF)
      D15-2 - A46-17 (PIA)
      D15-3 - A46-16 (PIB)
      D15-1 - A46-21 (SG-7)
      D15-5 - Body ground Always 10 kΩ or higher
      D15-4 - Body ground
      D15-2 - Body ground
      D15-3 - Body ground
      D15-1 - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY


    1. Temporally replace the recirculation damper servo sub-assembly with a new or normally functioning one Click here.

    2. Check the air inlet control damper operates normally.

      OK
      Air inlet control damper operates normally.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    END (RECIRCULATION DAMPER SERVO IS DEFECTIVE)