Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

READ VALUE USING INTELLIGENT TESTER (RECIRCULATION DAMPER SERVO)

CHECK FOR DTC

CHECK RECIRCULATION DAMPER SERVO SUB-ASSEMBLY

CHECK AIR CONDITIONING HARNESS ASSEMBLY

DTC B1442/42 Air Inlet Damper Control Servo Motor Circuit


DESCRIPTION

The recirculation 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 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 may be stored 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 when the air conditioning amplifier assembly operates the recirculation damper servo sub-assembly.
  1. Recirculation damper servo sub-assembly
  2. Air conditioning harness assembly
  3. Air conditioning amplifier assembly

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Clear the DTCs (LandCruiser RM000002LIT049X.html).

  1. Check for DTCs (LandCruiser RM000002LIT049X.html).

    Result
    Result
    		Proceed to
    DTC B1442/42 is not output
    		A
    DTC B1442/42 is output
    		B
    DTC B1442/42 and B1497/97 are output
    		C


B
Go to step 2

C
GO TO B1497/97 (LandCruiser RM000002LLQ052X.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

2.READ VALUE USING INTELLIGENT TESTER (RECIRCULATION DAMPER SERVO)

  1. Use the Data List to check if the recirculation damper servo sub-assembly is functioning properly (LandCruiser RM000002LIV040X.html).

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Air Inlet Damper Targ Pulse
    		Recirculation damper servo sub-assembly target pulse / Min.: 0, Max.: 255
    		7 (pulse): Recirculation
    28 (pulse): Fresh
    		-
    Air Inlet Damper Actual Pulse
    		Recirculation damper servo sub-assembly actual pulse / Min.: 0, Max.: 255
    		7 (pulse): Recirculation
    28 (pulse): Fresh
    		-
    OK:
    The display is as specified in the normal condition column.
    Result
    Result
    		Proceed to
    OK (When troubleshooting according to the DTC)
    		A
    OK (When troubleshooting according to Problem Symptoms Table)
    		B
    Both target pulse and actual pulse do not display
    		C
    Target pulse displays normally, but actual pulse does not display
    		D


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM0000045E302NX.html)

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)

D
Go to step 4
A


3.CHECK FOR DTC

  1. Clear the DTCs (LandCruiser RM000002LIT049X.html).

  1. Check for DTCs (LandCruiser RM000002LIT049X.html).

    OK:
    DTC B1442 is not output.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

4.CHECK RECIRCULATION DAMPER SERVO SUB-ASSEMBLY

  1. Replace the recirculation damper servo sub-assembly (LandCruiser RM000003B3T024X.html).

    HINT:
    Since the recirculation damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the recirculation damper servo sub-assembly with a new or normally functioning one.

  1. Clear the DTCs (LandCruiser RM000002LIT049X.html).

  1. Check for DTCs (LandCruiser RM000002LIT049X.html).

    OK:
    DTC B1442 is not output.


NG
Go to step 5
OK

END (RECIRCULATION DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

5.CHECK AIR CONDITIONING HARNESS ASSEMBLY

  1. Temporarily replace the air conditioning harness assembly with a new or normally functioning one (LandCruiser RM000003AXS04FX.html).

  1. Clear the DTCs (LandCruiser RM000002LIT049X.html).

  1. Check for DTCs (LandCruiser RM000002LIT049X.html).

    OK:
    DTC B1442 is not output.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)
OK

END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)