B1209

Component Location






General Description

It contains intake motor that changes intake door position and potentiometer that monitors position of intake door. When driver operates the intake switch, ECU receives mode signal from intake switch and operates intake door motor to turn intake door to intended position. (with FRE mode signal, intake door is closed and with REC mode signal, intake door is opened)
In operation, potentiometer delivers intake door position transformed into voltage value to A/C ECU.

DTC Description

Air-conditioner Control Module sets DTC B1209 if the Feed Back signal of Intake Actuator has been detected over 4.9V for 100ms.

DTC Detecting Condition






Specification

** Voltage value of Intake potentiometer as a function of position of Intake door






Diagnostic Circuit Diagram






Monitor Scantool Data

Check Actuation Test
1. Connect scantool with diagnostic connector.
2. Warm up the engine to normal temperature after engine start.
3. Select " Intake Potentiometer " parameter on the current data with scantool.
4. Perform Actuation Test for " Air Inlet Mode Selection - Regulation /Fresh in order.
5. With performing Actuation test, check that the value of each position sensors are changing.

Specification -Recirculation : About 90%, Fresh : About 10%.






6. Are the value of each position sensors changed when performing actuation test ?






Terminal & Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.
3. Has a problem been found?






Signal Circuit Inspection

Check short to battery in harness
1. Ignition "OFF".
2. Disconnect Intake actuator and A/C control unit main harness connector.
3. Ignition "ON".
4. Measure voltage between Signal(F/B) terminal of Intake actuator harness connector and chassis ground.

Specification :0V

5. Is the measured voltage within specification?






Ground Circuit Inspection

Check for open in harness
1. Ignition "OFF".
2. Disconnect Intake actuator and A/C control unit main harness connector.
3. Measure resistance between Sensor ground(-) terminal of Intake actuator harness connector and Sensor ground(-) terminal of A/C-ECU harness connector.

Specification :1Ohms below

4. Is the measured resistance within specification?






Component Inspection

Check Intake actuator
1. Ignition "OFF".
2. Disconnect Intake actuator and A/C control unit main harness connector.
3. Connect (+) terminal of battery to FRE(+) of intake actuator and (-) terminal to REC(-).(Component side)
4. Verify that the actuator operates to the REC position.
5. Verify that the temperature actuator operates to the FRE position with reverse connecting.( REC(-) and FRE(+)) (Component side)

Specification :Refer the specifications in fig.1

FIG.1) ** Function of the actuator motor according to terminal connection type. (observe safety regulations)






6. Is "Door position" display near the specified value?






Check potentiometer
1. Ignition "OFF".
2. Disconnect Intake actuator and A/C control unit main harness connector.
3. Ignition "ON"(ENGINE "OFF").
4. Measure voltage between Signal(F/B) terminal of Intake actuator harness connector and chassis ground.(Component side)

Specification :Refer the specifications in fig.2

FIG.2) Specifications : Voltage value of intake potentiometer as a function of intake door position.






5. Is "voltage" display near the specified value?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC.
2. Operate the vehicle and monitor the DTC on the scantool.
3. Are any DTCs present?