DTC    B1442/42    Air Inlet Damper Control Servomotor Circuit

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DESCRIPTION

The damper servo (air inlet control) sends pulse signals to inform the air conditioner amplifier of the damper position. The air conditioner amplifier activates the motor (normal, reverse) based on the signals to move the air inlet mode selection air inlet control 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 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 valve does not change even if air conditioner amplifier operated air inlet damper control servomotor
  1. Air outlet control servomotor
  2. Smart connector (Air conditioning harness)
  3. A/C amplifier

WIRING DIAGRAM


E107328E02


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and push the intelligent tester main switch on.

  1. Select the items below in the Data List, and read the displays on the intelligent tester.


A/C amplifier: 
Item
Measurement Item / Display
(Range)
Normal Condition
Diagnostic Note
Air Inlet Damper Targ Pulse
(A/I Damp Targ Pls)
Air inlet damper target pulse /
Min.: 0, Max.: 255
Customized value will be displayed
-

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


Result: 
NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A


2.REPLACE AIR INLET CONTROL SERVOMOTOR

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

OK:
Same problem does not occur.



OK
END
NG

REPLACE AIR CONDITIONING HARNESS