B1442

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 servomotor is controlled by the A/C amplifier and moves the air inlet control servo motor to the desired position.
The air inlet control servo motor switches between "RECIRCULATION" and "FRESH" by rotating the motor (normal, reverse) with electrical power from the A/C amplifier. This controls intake air and switches "RECIRCULATION", "FRESH" and "HALF-RECIRCULATION".






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the intelligent tester main switch on.
(c) Select the item below in the DATA LIST, and read the display on the intelligent tester.

DATA LIST / AIR CONDITIONER:





OK:
When the target position is at the "RECIRCULATION" (-9%), the actual opening angle is 19.0% or less.
When the target position is at the "FRESH" (109%), the actual opening angle is 81.0% or more.
Result:






C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER
(a) Remove the glove box to see and check the recirculation damper operation.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch ON and push the intelligent tester main switch 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 AIR CONDITIONING 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) Set the actuator check mode .
(c) Press the UPDr switch in order and check the operation of recirculation damper.






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






C -- REPLACE AIR CONDITIONING 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 damper 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 AIR CONDITIONING AMPLIFIER