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 air inlet mode selection 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)

-
Tip:

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

E315725E08

CAUTION / NOTICE / HINT

Note:

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

Click here

Tip:

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

  • When DTC B1442/42 and DTC B1497/97 are output simultaneously, first perform troubleshooting for DTC B1497/97.

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 power 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 target pulse

      Min.: 0

      Max.: 255

      • for LHD:

      • RECIRCULATION: 19 (pulse)

      • FRESH: 7 (pulse)

      • for RHD:

      • RECIRCULATION: 7 (pulse)

      • FRESH: 19 (pulse)

      • Displayed between 7 and 19 pulse

      • No. 1 blower damper servo sub-assembly system malfunction

      Air Inlet Damper Actual Pulse

      No. 1 blower damper servo sub-assembly actual pulse

      Min.: 0

      Max.: 255

      • for LHD:

      • RECIRCULATION: 19 (pulse)

      • FRESH: 7 (pulse)

      • for RHD:

      • RECIRCULATION: 7 (pulse)

      • FRESH: 19 (pulse)

      • Displayed between 7 and 19 pulse

      • No. 1 blower damper servo sub-assembly 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 DTCClick 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

      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. Clear the DTCs.

      Click here

      Body Electrical > Air Conditioner > Clear DTCs

    3. Check for DTCa.

      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 WAS DEFECTIVE)

    NG

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY

    1. Replace the air conditioning harness assembly.

      Click 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. 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 WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

  4. 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 hereClick hereClick here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here