Automatic Air Conditioning System

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

DTC 42 - Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The air inlet control servo motor (recirculation damper servo sub-assembly) is controlled by the A/C amplifier and moves the air inlet control servo motor (recirculation damper servo sub-assembly) to the desired position.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTUATOR CHECK
(a) Remove the glove box to see and check the air inlet control servo motor (recirculation damper servo sub-assembly) operation.
(b) Set the actuator check mode (Actuator Check).
(c) Press the DEF switch to change to the step operation.
(d) Press the DEF switch in order and check the operation of the air inlet control servo motor (recirculation damper servo sub-assembly).

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.
2. INSPECT AIR INLET CONTROL SERVO MOTOR (RECIRCULATION DAMPER SERVO SUB-ASSEMBLY)

(a) Remove the air inlet control servo motor (recirculation damper servo sub-assembly).
(b) Connect the positive (+) lead from the battery to terminal A18-5 (MEEC) and negative (-) lead to terminal A18-4 (MREC), then check that the lever turns to the "FRESH" position smoothly.
(c) Connect the positive (+) lead from the battery to terminal A18-4 (MREC) and negative (-) lead to terminal A18-5 (MEEC), then check that the lever turns to the "RECIRCULATION" position smoothly.
NG -- REPLACE AIR INLET CONTROL SERVO MOTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (AIR INLET CONTROL SERVO MOTOR - AIR CONDITIONING AMPLIFIER)

(a) 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