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 GTS (AIR INLET DAMPER TARG PULSE, AIR INLET DAMPER ACTUAL PULSE)

CHECK DAMPER SERVO MOTOR (REC/FRS)

CHECK AIR CONDITIONING HARNESS ASSEMBLY

CHECK FOR DTC

DTC B1442/42 Air Inlet Damper Control Servo Motor Circuit


DESCRIPTION

The damper servo motor (REC/FRS) 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 damper servo motor (REC/FRS) 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 damper servo motor (REC/FRS).
  1. Damper servo motor (REC/FRS)
  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


INSPECTION PROCEDURE

1.READ VALUE USING GTS (AIR INLET DAMPER TARG PULSE, AIR INLET DAMPER ACTUAL PULSE)

  1. Use the Data List to check if the damper servo motor (REC/FRS) is functioning properly (Click here).

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Air Inlet Damper Targ Pulse
    		Damper servo motor (REC/FRS) target pulse / Min.: 128, Max.: 383
    for LHD:
    1. Recirculation: 165 (pulse)
    2. Fresh: 137 (pulse)
    for RHD:
    1. Recirculation: 137 (pulse)
    2. Fresh: 165 (pulse)
    1. Displayed between 137 and 165 pulse
    2. Damper servo motor (REC/ FRS) system malfunction
    Air Inlet Damper Actual Pulse
    		Damper servo motor (REC/FRS) target pulse / Min.: 128, Max.: 383
    for LHD:
    1. Recirculation: 165 (pulse)
    2. Fresh: 137 (pulse)
    for RHD:
    1. Recirculation: 137 (pulse)
    2. Fresh: 165 (pulse)
    1. Displayed between 137 and 165 pulse
    2. Damper servo motor (REC/ FRS) system malfunction
    OK:
    When the mode switch is turned, the actual pulse changes following the target pulse.
    Result
    Result
    		Proceed to
    Target pulse changes but actual pulse does not change
    		A
    Target pulse and actual pulse do 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)
    		E


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

C
Go to step 4

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


2.CHECK DAMPER SERVO MOTOR (REC/FRS)

  1. Replace the damper servo motor (REC/FRS).

    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).

    OK:
    DTC B1442/42 is not output


B
Go to step 3
OK

END (DAMPER SERVO MOTOR [REC/FRS] WAS DEFECTIVE)

3.CHECK AIR CONDITIONING HARNESS ASSEMBLY

  1. Replace the air conditioning harness assembly with new or known good one.

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

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1442/42 is not output


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK

END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

4.CHECK FOR DTC

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1442/42 is not output


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)