B1442

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

DESCRIPTION

The damper servo (air inlet control) sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the air inlet control damper to the appropriate position, which controls the intake air settings (FRESH, FRESH / RECIRCULATION and RECIRCULATION).

HINT
Confirm that there are no mechanical problems because this DTC can be output when either a damper link or damper is mechanically locked.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON and turn the Techstream ON.

(c) Select the items below in the Data List, and read the value displayed on the Techstream.

Air conditioning amplifier:





OK:

The display is as specified in the normal condition column.

Result:





C -- REPLACE AIR CONDITIONING AMPLIFIER

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. REPLACE DAMPER SERVO SUB-ASSEMBLY

HINT
Since the servo motor cannot be tested when it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal.

OK:

Same problem does not occur.

NG -- REPAIR OR REPLACE AIR CONDITIONING HARNESS ASSEMBLY

OK -- SYSTEM IS OK