NOx SENSOR [SKYACTIV-X 2.0]
id0140hf011100
Purpose/Function
• Detects the NOx concentration after passing through the catalytic converter (gasoline particulate filter) and inputs the NOx concentration signal to the PCM via CAN.
Construction
• The gas detection area (probe) of the NOx sensor is installed to the rear of the catalytic converter (gasoline particulate filter).
• The NOx sensor (control unit) of the NOx sensor is secured to the bracket under the floor.
• The NOx sensor (control unit) is integrated with the probe and therefore cannot be disconnected.
• A zirconia element has been adopted for the detection part of the NOx sensor.
Operation
• From engine start and before start of measurement:
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― It operates the heater at low temperature and waits (because damage may occur if element contacts water)
• Measurement start:
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― It increases the heater temperature to the condition possible for measurement when the dew point end signal is input from the PCM the CAN.
• During measurement:
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― The NOx sensor maintains the element temperature at a high temperature condition, and sends the measured value to the PCM via CAN.
― It continues the measurement unless a malfunction is detected or a power supply malfunction occurs.
• The on-board diagnosis is performed during engine start.
