AIR CONDITIONING SYSTEM, Diagnostic DTC:B1487/87

DTC Code DTC Name
B1487/87 Passenger Side Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The mode damper servo (for passenger side front A/C rear air flow) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the mode damper servo (for passenger side front A/C rear air flow) to any position, which controls the air outlet changes.

Tech Tips

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

DTC No. DTC Detection Condition Trouble Area
B1487/87 Air outlet damper position sensor value does not change even if air conditioning amplifier operates air outlet servo motor

  • Air outlet servo motor (for passenger side front A/C rear air flow)

  • Air conditioning harness

  • Air conditioning amplifier

WIRING DIAGRAM

A01GK5YE20

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1487/87 is not output A
      DTC B1487/87 is output B
      DTC B1487/87 and B1497/97 are output C

    B

    READ VALUE USING INTELLIGENT TESTER (AIR OUTLET SERVO MOTOR (for Passenger Side Front A/C Rear Air Flow)) Click here

    C

    GO TO DTC B1497/97 Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  2. READ VALUE USING INTELLIGENT TESTER (AIR OUTLET SERVO MOTOR (for Passenger Side Front A/C Rear Air Flow))


    1. Use the Data List to check if the servo motor is functioning properly.

      Air Conditioner
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Air Outlet Servo Pls (F&R P)

      Passenger side front A/C rear air flow air outlet target pulse /

      Min.: 0, Max.: 255

      		 Customized value will be displayed -
      OK
      The display is as specified in the normal condition.

    2. Visually inspect the air outlet servo motor (for passenger side front A/C rear air flow).


      1. Visually inspect whether the air outlet servo motor (for passenger side front A/C rear air flow) operates.

        OK
        The air outlet servo motor (for passenger side front A/C rear air flow) operates.
        Result
        Result Proceed to
        The Data List value changes and the air outlet servo motor (for passenger side front A/C rear air flow) operates (When troubleshooting according to the DTC output) A
        The Data List value changes and the air outlet servo motor (for passenger side front A/C rear air flow) operates (When troubleshooting according to Problem Symptoms Table) B
        The Data List value does not change and the air outlet servo motor (for passenger side front A/C rear air flow) does not operate C
        The Data List value changes, but the air outlet servo motor (for passenger side front A/C rear air flow) does not operate D

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    D

    CHECK AIR OUTLET SERVO MOTOR (for Passenger Side Front A/C Rear Air Flow) Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1487/87 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. CHECK AIR OUTLET SERVO MOTOR (for Passenger Side Front A/C Rear Air Flow)


    1. Replace the air outlet servo motor Click here.

      Tech Tips

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

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1487/87 is not output.

    NG

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    OK

    END (AIR OUTLET SERVO MOTOR [for Passenger Side Front A/C Rear Air Flow] IS FAULTY)

  5. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1487/87 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    END (AIR CONDITIONING HARNESS IS FAULTY)