AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:41

DTC Code DTC Name
41 Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DESCRIPTION

The air mix damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the air mix control damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air mix control damper to any position. As a result, the air mix control damper varies the mixture of hot air from the heater core and cold air from the evaporator so that the temperature of the air blowing toward the driver and front passenger side is as requested.

Tech Tips

This DTC is also output if the 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 DTC Detection Condition Trouble Area
41 The air mix control damper position does not change when the air conditioning amplifier assembly operates the air mix damper servo sub-assembly.

  • Air mix damper servo sub-assembly

  • Air conditioning amplifier assembly

  • Harness or connector

WIRING DIAGRAM

A01J4KME03

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. Warm up the engine.

    2. Enter actuator check mode Click here.

    3. Place your hand in front of a vent and check that the air mix control damper position changes (the temperature of the air changes) according to the display code.

      Display Code Air Mix Control Damper Position
      0 COLD side (0% open)
      1 COLD side (0% open)
      2 COLD side (0% open)
      3 COLD side (0% open)
      4 COLD/HOT (50% open)
      5 COLD/HOT (50% open)
      6 HOT side (100% open)
      7 HOT side (100% open)
      8 HOT side (100% open)
      9 HOT side (100% open)
      OK
      Air mix 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 (AIR MIX 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 (AIR MIX DAMPER SERVO - AIR CONDITIONING AMPLIFIER)


    1. Disconnect the D15 air mix damper servo sub-assembly connector.

    2. Disconnect the A38 and A37 air conditioning amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D15-5 (MHD) - A38-17 (AMH) Always Below 1 Ω
      D15-4 (MCD) - A38-19 (AMC)
      D15-3 (MHP) - A37-23 (PMB)
      D15-2 (MCP) - A37-24 (PMA)
      D15-1 (SG) - A37-20 (SG-1)
      D15-1 (SG) - Body ground Always 10 kΩ or higher
      D15-2 (MCP) - Body ground
      D15-3 (MHP) - Body ground
      D15-4 (MCD) - Body ground
      D15-5 (MHD) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY


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

    2. Check the air mix control damper operates normally.

      OK
      Air mix control damper operates normally.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    END (AIR MIX DAMPER SERVO IS DEFECTIVE)