Air Conditioning System (for Manual Air Conditioning System)

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

DESCRIPTION

The recirculation damper servo sub-assembly 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 air inlet modes (FRESH, FRESH / RECIRCULATION and RECIRCULATION).

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (AIR INLET DAMPER TARG PULSES)

(a) Connect the Techstream to the DLC3.

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

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

Data List / Air Conditioner





OK:

The display is as specified in the normal condition column.

Result:





C -- REPLACE AIR CONDITIONING AMPLIFIER Removal

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (for Manual Air Conditioning System)
A -- Continue to next step.

2. REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY

(a) Replace the recirculation damper servo sub-assembly Removal.

NEXT -- Continue to next step.

3. CHECK DTC OUTPUT

(a) Clear the DTCs. ( Air Conditioning System (for Manual Air Conditioning System))

(b) Check for DTCs. ( Air Conditioning System (for Manual Air Conditioning System))

OK:

DTC B1442/42 is not output.

NG -- REPAIR OR REPLACE AIR CONDITIONING HARNESS

OK -- END (RECIRCULATION DAMPER SERVO SUB-ASSEMBLY IS DEFECTIVE)