Air Conditioning System (For Automatic Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1442/42: Air Inlet Damper Control Servo Motor Circuit

DTC B1442/42 - Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The air inlet damper servo motor 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).
HINT: Confirm that no mechanical problem is present because this diagnostic trouble code can be output when either a damper link or damper is mechanically locked.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (AIR INLET DAMPER TARGET PULSE)
(a) Use the Data List to check if the servo motor is functioning properly.

Air Conditioner





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

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. REPLACE AIR INLET SERVO MOTOR
(a) Temporarily replace the air inlet servo motor with a new one Disassembly.
HINT: Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new one and check that the condition returns to normal.

NEXT -- Continue to next step.
3. CHECK FOR DTC
(a) Clear the DTC DTC Check / Clear.
(b) Check for DTC DTC Check / Clear.
OK:
DTC is not output.
NG -- REPAIR OR REPLACE AIR CONDITIONING HARNESS
OK -- END (AIR INLET SERVO MOTOR IS DEFECTIVE)
4. REPAIR OR REPLACE AIR CONDITIONING HARNESS
(a) Repair or replace the air conditioning harness.
NEXT -- Continue to next step.
5. CHECK FOR DTC
(a) Clear the DTC DTC Check / Clear.
(b) Check for DTC again DTC Check / Clear.
OK:
DTC is not output.
NG -- REPLACE AIR CONDITIONING AMPLIFIER
OK -- END