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Volvo engine code DTC P208E
Aftertreatment SCR Dosing Valve: Rationality Monitor During reverse DEF flow conditions on a pressurized selective catalytic reduction (SCR) system, pressure drop is evaluated. If DEF pressure drop is too low, the aftertreatment DEF direction valve is considered to have a mechanical fault (blocked or stuck). P208E AftertreatmentSCR Dosing Valve: Functional Check DTC P208E Component / System SCR Dosing Valve - Functional Monitor Strategy Description Pump duty cycle comparison between high and low DEF demand Fault Limit Delta = High DEF pump duty cycle - Low DEF pump duty cycle < 1.5% Enable Conditions High • DEF Pressure > 800 kPa • Dosing Valve Duty Cycle > 15% Low • DEF Pressure > 800 kPa • Dosing Valve Duty Cycle < 5% Disable Conditions No Active DTC's: • P2048, P2049, P204C, P204D, P204A, P208B, P208D, P208C Time Required For DTC To Be Set 100 seconds (7 sub evaluations. If 6 out of 7 are bad => FAIL, If 2 out of 7 are good => PASS) MIL Illumination 2 Drive Cycles