Automatic Air Conditioning System

AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): 33: Air Outlet Damper Position Sensor Circuit

DTC 33 - Air Outlet Damper Position Sensor Circuit

DESCRIPTION

This sensor detects the position of the air outlet control servo motor (mode damper servo sub-assembly) and sends the appropriate signals to the A/C amplifier. The position sensor is built in the air outlet control servo motor (mode damper servo sub-assembly).









WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT AIR CONDITIONING AMPLIFIER (TPO - SG-1)





(a) Remove the A/C amplifier with the connectors still connected.
(b) Turn the ignition switch to the ON position.
(c) Change the mode setting to activate the mode air outlet control servomotor (damper servo sub-assembly).
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:





HINT: As the air outlet control servo motor (mode damper servo sub-assembly) moves from the FACE side to the DEF side, the voltage decreases gradually without interruption.

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 OUTLET CONTROL SERVO MOTOR (MODE DAMPER SERVO SUB-ASSEMBLY)





(a) Remove the air outlet control servo motor (mode damper servo sub-assembly).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Measure the resistance according to the value(s) in the table below.

HINT: For details, regarding operation of the servo motor. (Automatic Air Conditioning System)

Standard resistance:





HINT: As the air outlet control servo motor (mode damper servo sub-assembly) moves from the DEF side to the FACE side, the resistance decreases gradually without interruption.

NG -- REPLACE AIR OUTLET CONTROL SERVO MOTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (AIR OUTLET 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