DTC    B1432/32    Air Inlet Damper Position Sensor Circuit

for Preparation Click here


DESCRIPTION

E109300E01
This sensor detects the position of the air inlet control servomotor and sends the appropriate signals to the A/C amplifier assembly. The position sensor is built in the air inlet control servomotor.
The position sensor's resistance changes as the air inlet control servomotor arm moves.
It outputs voltage (5 V) that is input to terminal 1 (VZ) and terminal 3 (PT) via the variable resister, and then to the A/C amplifier assembly.
The A/C amplifier reads the arm position with the input voltage from the position sensor.

DTC No.
DTC Detecting Condition
Trouble Area
B1432/32
Open or short in power source circuit in air inlet damper position sensor circuit
  1. Air inlet control servomotor (air inlet damper position sensor)
  2. Harness or connector between air inlet control servomotor and A/C amplifier assembly
  3. A/C amplifier assembly

WIRING DIAGRAM


I036321E07


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and push the intelligent tester main switch on.

  1. Select the item below in the DATA LIST, and read the display on the intelligent tester.


DATA LIST / AIR CONDITIONER 
Item
Measurement Item/Display
(Range)
Normal Condition
Diagnostic Note
A/I DAMP POS
Air inlet damper position / min.: -14% max.: 113.5%
Damper is at "RECIRCULATION": -9%
Damper is at "FRESH": 109%
Damper is at "HALF-RECIRCULATION": 35 to 75%
Open in the circuit: 50.0%
A/I DAMP TARG
Air inlet damper target position / min.: -14% max.: 113.5%

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


Result:

Result
Proceed to
NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
A


2.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    E109265E21

  1. Remove the A/C amplifier assembly with the connectors still connected.

  1. Change the set REC/FRS to activate the air inlet servomotor.

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    A10-7 (TPI) - A10-17 (SG-4)
    		Ignition switch ON
    RECIRCULATION position
    		3.8 to 4.8 V
    A10-7 (TPI) - A10-17 (SG-4)
    		Ignition switch ON
    FRESH position
    		0.2 to 1.2 V
    A10-13 (S5-4) - A10-17 (SG-4)
    		Ignition switch ON
    		4.5 to 5.5 V
    A10-13 (S5-4) - A10-17 (SG-4)
    		Ignition switch OFF
    		Below 1 V

    HINT:
    As the air inlet servomotor is moved from REC side to FRS side, the voltage decreases gradually without interruption.


Result:

Result
Proceed to
NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
A


3.INSPECT AIR INLET CONTROL SERVOMOTOR


    E110734E01

  1. Remove the air inlet control servomotor.

  1. Disconnect the connector from the air inlet control servomotor.

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

    Resistance:
    Tester connection
    (Symbol)
    		Condition
    		Specified condition
    A19-1 (VZ) - A19-2 (GND)*1
    		Always
    		4.2 to 7.8 kΩ
    A19-2 (VZ) - A19-1 (GND)*2
    		Always
    		4.2 to 7.8 kΩ

    1. *1: LHD
    2. *2: RHD

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    A19-3 (PT) - A19-2 (GND)*1
    		RECIRCULATION position
    		4.1 to 6.1 kΩ
    A19-3 (PT) - A19-2 (GND)*1
    		FRESH position
    		0.6 to 1.2 kΩ
    A19-3 (PT) - A19-1 (GND)*2
    		RECIRCULATION position
    		4.1 to 6.1 kΩ
    A19-3 (PT) - A19-1 (GND)*2
    		FRESH position
    		0.6 to 1.2 kΩ

    1. *1: LHD
    2. *2: RHD



    E108925E04

  1. As the air inlet control servomotor is moved from fresh to recirculation, the resistance decreases gradually without interruption.

    HINT:
    For details regarding operation of the servomotor (Click here).



NG
REPLACE AIR INLET CONTROL SERVOMOTOR
OK


4.CHECK HARNESS AND CONNECTOR (AIR INLET CONTROL SERVOMOTOR - A/C AMPLIFIER ASSEMBLY)


    E109216E17

  1. Disconnect the connector from the A/C amplifier assembly.

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    A10-7 (TPI) - A19-3 (PT)
    		Always
    		Below 1 Ω
    A10-17 (SG-4) - A19-2 (GND)*1
    		Always
    		Below 1 Ω
    A10-17 (SG-4) - A19-1 (GND)*2
    		Always
    		Below 1 Ω
    A10-13 (S5-4) - A19-1 (VZ)*1
    		Always
    		Below 1 Ω
    A10-13 (S5-4) - A19-2 (VZ)*2
    		Always
    		Below 1 Ω
    A10-7 (TPI) - Body ground
    		Always
    		10 kΩ or higher
    A10-17 (SG-4) - Body ground
    		Always
    		10 kΩ or higher
    A10-13 (S5-4) - Body ground
    		Always
    		10 kΩ or higher

    1. *1: LHD
    2. *2: RHD



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY