B1433

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1433: Air Outlet Damper Position Sensor Circuit

DTC B1433 - Air Outlet Damper Position Sensor Circuit

DESCRIPTION

This sensor detects the position of the air outlet control servo motor and sends the appropriate signals to the air conditioning amplifier. The position sensor is built into the air outlet control servo motor. The potentiometer's resistance changes as the air outlet control servo motor arm moves.
It outputs voltage (5 V) that is input to terminal 1 (VZ) and terminal 3 (PT) via the variable resistor, and then to the air conditioning amplifier. The air conditioning amplifier reads the arm position with the input voltage from the potentiometer.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

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

Air conditioning amplifier

OK:
The displayed is as specified in the normal condition.

Result

C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. CHECK AIR CONDITIONING AMPLIFIER (TPM VOLTAGE)

(a) Remove the air condition amplifier with connectors still connected.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:

HINT: As the air outlet servo motor is moved from the FACE position to the DEF position, 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.

3. INSPECT AIR OUTLET CONTROL SERVO MOTOR

(a) Remove the air outlet control servo motor.
(b) Measure the resistance of the servo motor.
Standard resistance:

HINT:
- Refer to the operation procedure for air outlet control servo motor B1443.
- As the air outlet control servo motor moved from DEF position to FACE position, the resistance decreases gradually without interruption.

NG -- REPLACE AIR OUTLET CONTROL SERVO MOTOR
OK -- Continue to next step.

4. CHECK WIRE HARNESS (AIR OUTLET CONTROL SERVO MOTOR - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the A16 servo connector.
(b) Disconnect the A7 amplifier connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER