Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit

Vehicle Interior. Corolla. Zre142 Aze141
Heating Air Conditioning. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

INSPECT AIR INLET CONTROL SERVO MOTOR

INSPECT AIR CONDITIONING HARNESS

DTC B1442/42 Air Inlet Damper Control Servo Motor Circuit


DESCRIPTION

The damper servo (air inlet control) 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). The A/C amplifier communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness.
HINT:
Confirm that no mechanical problem is present because this DTC can be output when either a damper link or the 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 operates air inlet control servo motor
  1. Air inlet control servo motor
  2. Air conditioning harness
  3. A/C amplifier

WIRING DIAGRAM


Corolla. Zre142 Aze141.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 TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Operate the R/F (Recirculation/Fresh) switch.

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

  1. Check the value(s) by referring to the table below.

    Air Conditioner
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Air Inlet Damper Targ Pulse
    (A/I Damp Targ Pls)
    		Air inlet damper target pulse / Min.: 0, Max.: 255
    1. RECIRCULATION: 19 (pulse)
    2. FRESH: 7 (pulse)
    		-
    OK:
    The display is as specified in the "Normal Condition" column.

    Result:

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


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM000001M2W05OX.html)

C
REPLACE AIR CONDITIONING AMPLIFIER (COROLLA_ZRE142 RM000002XMC01VX.html)
A


2.INSPECT AIR INLET CONTROL SERVO MOTOR

  1. Replace the air inlet control servo motor (COROLLA_ZRE142 RM000002Y2101IX.html).

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

  1. Check for DTCs.

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


B
REPLACE AIR INLET CONTROL SERVO MOTOR (COROLLA_ZRE142 RM000002Y2101IX.html)
A


3.INSPECT AIR CONDITIONING HARNESS

  1. Replace the air conditioning harness (COROLLA_ZRE142 RM000001HLX05GX.html).

    HINT:
    Since the air conditioning harness cannot be inspected while it is removed from the vehicle, replace the air conditioning harness with a known good one and check that the condition returns to normal.

  1. Check for DTCs.

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


B
REPLACE AIR CONDITIONING HARNESS (COROLLA_ZRE142 RM000001HLX05GX.html)
A

REPLACE AIR CONDITIONING AMPLIFIER (COROLLA_ZRE142 RM000002XMC01VX.html)