Air Inlet Damper Control Servo Motor Circuit - 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 control servo motor is controlled by the A/C amplifier and moved to the desired position.
The air inlet control servo motor switches the air inlet mode by rotating (normal, reverse) with electrical power from the A/C amplifier. This controls intake air and changes the mode between "RECIRCULATION", "FRESH", and "HALF-RECIRCULATION".






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position and turn Techstream on.
(c) Select the items below in the Data List, and read the display on Techstream.

Data List / Air Conditioner:





OK:
When the target position is "RECIRCULATION" (-10%), the actual opening angle is 19.0% or less.
When the target position is "FRESH" (110%), the actual opening angle is 81.0% or more.
Result:






C -- REPLACE A/C AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Remove the glove box to see and check the recirculation damper operation.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch to the ON position and turn Techstream on.
(d) Select the item below in the Active Test and then check that the damper operates.

Active Test / Air Conditioner:





OK:
Lever turns from "RECIRCULATION" side to "FRESH" side smoothly.
Lever turns from "FRESH" side to "RECIRCULATION" side smoothly.
Result:






C -- REPLACE A/C AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
3. PERFORM ACTUATOR CHECK
(a) Remove the glove box to see and check the recirculation damper operation.
(b) Enter the actuator check mode .
(c) Press the DEF switch and check the operation of the recirculation damper.






OK:
Recirculation damper position changes in accordance with each display code.
Result:






C -- REPLACE A/C AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
4. INSPECT AIR INLET CONTROL SERVO MOTOR





(a) Remove the air inlet control servo motor.
(b) Disconnect the connector from the air inlet control servo motor.
(c) Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turns to the "FRESH" position smoothly.
OK:
Lever turns to "FRESH" position smoothly.
(d) Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turns to the "RECIRCULATION" position smoothly.
OK:
Lever turns to "RECIRCULATION" position smoothly.
NG -- REPLACE AIR INLET CONTROL SERVO MOTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (AIR INLET CONTROL SERVO MOTOR - A/C AMPLIFIER)





(a) Disconnect the connector from the A/C amplifier.





(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE A/C AMPLIFIER