Air Inlet Damper Position Sensor Circuit - Air Conditioning System

AIR CONDITIONING: AIR CONDITIONING SYSTEM: 32: Air Inlet Damper Position Sensor Circuit

DTC 32 - Air Inlet Damper Position Sensor Circuit

DESCRIPTION

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









WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT AIR CONDITIONING AMPLIFIER (TPI, SG)




(a) Remove the A/C amplifier with the connectors still connected.
(b) Turn the ignition switch ON.
(c) Change the set RECIRCULATION/FRESH to activate the blower damper.
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:





HINT: As the blower damper is moved from RECIRCULATION side to FRESH side, the voltage decreases gradually without interruption.

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG -- Continue to next step.

2. INSPECT BLOWER DAMPER SERVO SUB-ASSEMBLY
(a) Remove the blower damper servo sub-assembly.




(b) Disconnect the connector from the blower damper servo sub-assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:








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








(e) As the blower damper servo sub-assembly moves from FRESH side to RECIRCULATION side, the resistance decreases gradually without interruption.

HINT: For details regarding operation of the servo motor Air Inlet Damper Control Servo Motor Circuit - Air Conditioning System.

NG -- REPLACE BLOWER DAMPER SERVO SUB-ASSEMBLY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (AIR INLET DAMPER POSITION SENSOR - A/C AMPLIFIER)
(a) Check for open and short circuit in the harness and the connector between the blower damper servo sub-assembly (air inlet damper position sensor) and the A/C amplifier Electronic Circuit Inspection Procedure.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK DTC
(a) Start up the DTC check mode.
(b) Check that DTC 32 is not output again.
Result:





B -- SYSTEM IS OK
A -- REPLACE AIR CONDITIONING AMPLIFIER