UREA QUALITY SENSOR [SKYACTIV-D 2.2]

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Purpose, Function

• The urea quality sensor detects the AdBlue^® concentration in the urea tank.

• The detected concentration is sent to the PCM via a CAN signal from the dosing control unit after sending it to the dosing control unit via SENT communication.

Construction

• The urea quality sensor is installed in the urea tank.

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Operation

• The urea quality sensor is supplied power from the dosing control unit and initiates measuring the AdBlue^® concentration.

• After supplying the power, it begins measuring the initial concentration after approx. 9 s, and then performs the measurement approx. every 21 s.

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Measurement method

• By operating the built-in heater, the urea quality sensor measures the change in the AdBlue^® temperature using the temperature sensor.

• The urea quality sensor detects the AdBlue^® concentration by the difference in thermal conductivity and also detects fluid other than AdBlue^®.

Fail-safe

• Not applicable.