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Volvo engine code DTC P2201
NOx Sensor #1: Emission Threshold In addition to the circuitry monitors, the two NOx sensors are subjected to plausibility checks as part of the NOx sensor diagnostics. The two NOx sensors are monitored to ensure that they are capable of accurately evaluating the NOx exhaust emissions and that they can be used by the engine emissions control strategies. Inlet NOx Sensor The NOx sensor located upstream of the NOx converting catalyst is rationalized against a calculated NOx value. The NOx sensor is considered faulty whenever the difference between the NOx sensor value and the calculated NOx value is greater than the threshold. P2201 NOx Sensor #1: Rationality Monitor DTC P2201 Component / System NOx Sensor #1 - Plausibilty Monitor Strategy Description Sensor Rationality Check Fault Limit Delta = Engine modeled NOx flow - NOx sensor based NOx flow < -20% Enable Conditions • Engine Speed 1120 - 1620 RPM • Modeled NOx Fllow > 0.15 g/s • Engine Torque 1300 - 2000 Nm • Ambient Air Temperature -7 - 40 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 70 °C • Engine Speed Stability -10 to 10 RPM • Torque Stability -15 to 15 RPM • EGR Control Stability -1.5% to 1.5% Disable Conditions No Active DTC's: • P0401, P0402, P0400, P0402, P225D, P225F, P242A, P0421, P221A Time Required For DTC To Be Set 3 seconds MIL Illumination 2 Drive Cycles