Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (REC/FRS DAMPER SERVO MOTOR)

CHECK REC/FRS DAMPER SERVO MOTOR

CHECK AIR CONDITIONING HARNESS ASSEMBLY

DTC B1442/42 Air Inlet Damper Control Servo Motor Circuit


DESCRIPTION

The REC/FRS damper servo motor sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or 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 trouble code can be output when either a damper link or damper is mechanically locked.

DTC Code
DTC Detection Condition
Trouble Area
B1442/42
The air inlet damper position does not change even if the air conditioning amplifier assembly operates the REC/FRS damper servo motor.
  1. REC/FRS damper servo motor
  2. Air conditioning harness assembly
  3. Air conditioning amplifier assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit


Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (REC/FRS DAMPER SERVO MOTOR)

  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 Inlet Damper Targ Pulse
    		REC/FRS damper servo motor target pulse /
    Min.: 9, Max.: 37
    		for LHD
    Recirculation: 37 (pulse)
    Fresh: 9 (pulse)
    for RHD
    Recirculation: 9 (pulse)
    Fresh: 37 (pulse)
    		-
    OK:
    The display is as specified in the normal condition.
    Result
    Result
    		Proceed to
    OK (Checking from the DTC)
    		A
    OK (Checking from the PROBLEM SYMPTOMS TABLE)
    		B
    NG
    		C


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

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
A


2.CHECK REC/FRS DAMPER SERVO MOTOR

  1. Replace the REC/FRS damper servo motor.

    1. for LHD: Click here
    2. for RHD: Click here
    HINT:
    Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B1442/42 is not output
    		A
    DTC B1442/42 is output
    		B


B
Go to step 3
A

END (REC/FRS DAMPER SERVO MOTOR IS DEFECTIVE)

3.CHECK AIR CONDITIONING HARNESS ASSEMBLY

  1. Replace the air conditioning harness assembly.

    1. for LHD: Click here
    2. for RHD: Click here

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B1442/42 is not output
    		A
    DTC B1442/42 is output
    		B


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

END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)