B2406

Component Location






General Description

It contains temp motor that changes temp door position and potentiometer that monitors position of temp door.Temperature control actuator regulates the temperature by the procedure as follows. Signal from control unit adjusts position of temp door by operating temp motor and then temperature will be regulated by the hot/cold air ratio decided by position of temp door. In operation, potentiometer delivers temp door position transformed into voltage value to A/C ECU.

DTC Description

Air conditioner Control Module sets DTC B2406 if Driver air mix actuator has not been moved to the mode,where air condition control module controls, within 10 seconds.

DTC Detecting Condition






Specification

** Voltage value of Air Mix potentiometer as a function of temp door position.






Diagnostic Circuit Diagram






Monitor Scantool Data

Actuation Test
1. Connect scantool with diagnostic connector.
2. Warm up the engine to normal engine temperature after engine starts.
3. Select and monitor "Air Mix Door Potentioner-Driver" parameter on scantool.
4. Select and perform Actuation test Air Mix Door Potentioner-Driver - 0% / 50% / 100% in order.
5. Check that the value of all the parameters are changed when performing the actuation test.

Specification :Check that the value of Air Mix Door Potentiometer at current data should be close to the value of the acutation test.






6. Does the value of current data follow in accordance with the each 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?






Control Circuit Inspection

Check for open in harness
1. Ignition "OFF".
2. Disconnect Driver air mix actuator and A/C control unit main harness connector.
3. Measure resistance between WARM terminal of Driver air mix actuator harness connector and WARM terminal of A/C-ECU harness connector.
4. Measure resistance between COOL terminal of Driver air mix actuator harness connector and COOL terminal of A/C-ECU harness connector.

Specification :1Ohms below

5. Is the measured resistance within specification?






Check short to ground in harness
1. Ignition "OFF".
2. Disconnect Driver air mix actuator and A/C control unit main harness connector.
3. Measure resistance between WARM terminal of Driver air mix actuator harness connector and chassis ground.
4. Measure resistance between COOL terminal of Driver air mix actuator harness connector and chassis ground.

Specification :Infinity

5. Is the measured resistance within specification?






Component Inspection

Check passenger air mix actuator
1. Ignition "OFF".
2. Disconnect Driver air mix actuator and A/C control unit main harness connector.
3. Connect (+) terminal of battery to WARM(+) of Driver air mix actuator and (-) terminal to COOL(-).(Component side)
4. Verify that the temperature actuator operates to the cool position.
5. Verify that the temperature actuator operates to the warm position with reverse connecting.( WARM(+) and COOL(-) ).(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. Connect Driver air mix actuator and A/C control unit main harness connector.
3. Ignition "ON".
4. Measure voltage between Signal(F/B) terminal of Driver air mix actuator harness connector and Sensor ground(-) terminal of A/C-ECU harness connector.(Component side)

Specification :Refer the specifications in fig.2

FIG.2) Voltage value of Air Mix potentiometer as a function of temp 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?