DTC    B1442/42    Air Inlet Damper Control Servo Motor Circuit

for Preparation Click here


DESCRIPTION

The air inlet control servo motor 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 air inlet damper to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION and RECIRCULATION).

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


DTC No,
DTC Detection Condition
Trouble Area
B1442/42
Air inlet damper position sensor value does not change even if air conditioning amplifier operated air inlet control servo motor
  1. Air inlet control servo motor
  2. Air conditioning harness
  3. Air conditioning amplifier

WIRING DIAGRAM


E156865E38


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (AIR INLET DAMPER TARGET PULSE)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Air Conditioner / Data List.

  1. According to the display on the intelligent tester, read the Data List.

    Air Conditioner 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Air Inlet Damper Target Pulse
    		Air inlet damper target pulse /
    Min.: 0
    Max.: 255
    		for LHD
    RECIRCULATION: 45 (pulse)
    FRESH: 30 (pulse)
    for RHD
    RECIRCULATION: 16 (pulse)
    FRESH: 32 (pulse)
    		-

    OK:
    The display is as specified in the normal condition.


    Result 
    Result
    		Proceed to
    NG
    		A
    OK (When troubleshooting according to the Problem Symptoms Table)
    		B
    OK (When troubleshooting according to the DTC output)
    		C



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

C
REPLACE AIR CONDITIONING AMPLIFIER (Click here)
A


2.REPLACE AIR INLET CONTROL SERVO MOTOR

  1. Temporarily replace the air inlet control servo motor with a new one (Click here).

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


NEXT


3.CHECK FOR DTC

  1. Clear the DTC (Click here).

  1. Check for DTC (Click here).

    OK:
    DTC is not output.



NG
Go to step 4
OK

END (AIR INLET CONTROL SERVO MOTOR IS FAULTY) 

4.REPAIR OR REPLACE AIR CONDITIONING HARNESS

  1. Repair or replace the air conditioning harness (Click here ).


NEXT


5.CHECK FOR DTC

  1. Clear the DTC (Click here).

  1. Check for DTC again (Click here).

    OK:
    DTC is not output.



NG
REPLACE AIR CONDITIONING AMPLIFIER (Click here)
OK

END