NOx SENSOR [SKYACTIV-D 2.2]

id0140z7011100

NOx SENSOR No.1 (with SCR system)

Purpose, Function

•  The NOx sensor No.1 detects NOx after it passes through the catalytic converter (diesel particulate filter) and inputs NOx to the dosing control unit and PCM via CAN.

Construction

•  The gas detection area (probe) of the NOx sensor No.1 is installed to the rear of the catalytic converter.

•  The NOx sensor No.1 (control unit) of the NOx sensor No.1 is secured to the bracket under the floor.

•  The NOx sensor No.1 (control unit) is integrated with the probe and therefore cannot be disconnected.

am6zzn00006017

Operation

•  From engine start and before start of measurement:

―  It operates the heater at low temperature and waits (because damage may occur if element contacts water)

•  Measurement start:

―  It increases the heater temperature to the condition possible for measurement when the dew point end signal is input from the dosing control unit via the CAN.

•  During measurement:

―  The NOx sensor No.1 maintains the element temperature at a high temperature condition, and sends the measured value to the dosing control unit and PCM via CAN.

―  It continues the measurement unless a malfunction is detected or a power supply malfunction occurs.

•  It performs the malfunction diagnosis just after the ignition is switched OFF.

ac5uun00003992

Fail-safe

DTC No.	Fail-safe function
P2200:00 P2202:00 P2203:00 P2204:00 P2205:00 P220A:00 P220E:00	•  Restricts the maximum remaining distance to empty. •  Limits the upper limit of the engine speed.

NOx SENSOR No.2 (with SCR system)

Purpose, Function

•  The NOx sensor No.2 detects NOx after passing it through the SCR converter and inputs NOx to the dosing control unit via a CAN signal.

Construction

•  The NOx sensor No.2 is installed to the rear of the SCR converter.

•  The NOx sensor No.2 (control unit) of the NOx sensor No.2 is secured to the bracket under the floor.

•  The NOx sensor No.2 (control unit) is integrated with the probe and therefore cannot be disconnected.

am6zzn00006018

Operation

•  From engine start and before start of measurement:

―  It operates the heater at low temperature and waits (because damage may occur if element contacts water)

•  Measurement start:

―  It increases the heater temperature to the condition possible for measurement when the dew point end signal is input from the dosing control unit via the CAN.

•  During measurement:

―  The NOx sensor No.2 maintains the element temperature at a high temperature condition, and sends the measured value to the dosing control unit and PCM via CAN.

―  It continues the measurement unless a malfunction is detected or a power supply malfunction occurs.

•  It performs the malfunction diagnosis just after the ignition is switched OFF.

ac5uun00003993

Fail-safe

DTC No.	Fail-safe function
P220B:00 P229E:00 P22A1:00 P22A2:00 P22A3:00	•  Restricts the maximum remaining distance to empty. •  Limits the upper limit of the engine speed.