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Volvo engine code DTC P242B
Exhaust Gas Temperature Sensors: Rationality Monitors The exhaust gas system has three temperature sensors. The pre-DOC sensor measures the engine exhaust gas temperature, the post-DOC sensor measures the temperature downstream of the DOC, and the post-DPF sensor measures the temperature downstream of the DPF. The rationality monitor for the exhaust temperature sensors evaluates the plausibility of the sensor comparing the pre-DOC, DOC outlet and DPF outlet temperature sensor values. During normal driving conditions, the temperature of the DOC outlet and the DPF outlet is very close to the engine exhaust gas temperature (pre-DOC). This difference is integrated over a period of time. The average of the three sensors is determined and a reference temperature is calculated. The temperature sensor values are compared to the reference value and if the difference is above the threshold a DTC is reported. P242B Exhaust Gas Temperature Sensors: Post-DPF Rationality Check DTC P242B Component / System Post-DPF Temperature Sensor - Rationality Monitor Strategy Description Plausibility check of the sensor value Fault Limit Average DPF temperature deviation > 70 °C Enable Conditions • Modeled Exhaust Temperature < 15 °C • Modeled DOC Temperature - DPF Temperature < 15 °C • Modeled DPF Temperature - Exhaust Temperature < 15 °C • Engine Torque > 800 Nm • Modeled Engine Exhaust Temperature 250 - 475 °C • Ambient Air Temperature -8 - 55 °C • Barometric Pressure < 105 kPa • Coolant Temperature > 65 °C Disable Conditions No Active DTC's: • P242C, P242A, P2032, P2031, P0544, P0545 Time Required For DTC To Be Set 45 seconds MIL Illumination 2 Drive Cycles