Introduction to On Board Diagnostics (II)

Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsEvaporative Emission control system (Purge valve) ( DTCs 440-445):445):Purge valve diagnostics are performed for deterioration of evaporative emissioncontrol system. In case of evaporative emission control system malfunction faultcode 440 is assigned. If the evaporative emission control system is havingincorrect purge flow due to faulty purge valve, fault code 441 is assigned. If theevaporative emission control system has detected small leak, fault fcode 442 isassigned. If the evaporative emission control system has purge control cvalvecircuit malfunction fault code 443 is assigned. If the evaporative ative emission controlsystem has purge control valve circuit open, fault code 444 is assigned. If theevaporative emission control system has purge control valve circuit shorted faultcode 445 is assigned. Evaporative system diagnostics are covered in detail in alater section.