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Volvo engine code DTC P225C
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. P225C Inlet and Outlet NOx Sensor Stuck High The monitor is performed during no fueling (motoring) conditions where the expected amount of exhaust NOx concentration is nearly zero. A fault condition is logged whenever the NOx sensor read value is above a limit value during no fueling. DTC P225C Component / System NOx Sensor #1 - Rationality High Monitor Strategy Description Rationality High Fault Limit NOx sensor value > 200 PPM Enable Conditions • Fueling Amount < 0.001 g/sec • Engine Torque < 1000 Nm Disable Conditions No Active DTC's: • P225D, P0400, P0402, P225F, P242A, P0421, P221A Time Required For DTC To Be Set 5 seconds MIL Illumination 2 Drive Cycles