General Information of OBDII (On- Board Diagnostics II) The OBDII system is designed to monitor a vehicle's emission control systems and key engine components by performing either continuous or periodic tests of specific components and vehicle conditions. This is done with three pieces of such valuable information: • Whether the Malfunction Indicator Light (MIL) is “on” or “off”; • Which, if any, Diagnostic Trouble Codes (DTCs) are stored; • Readiness Monitoring status. Diagnostic Trouble Codes(DTCs) Exemple de DTC P0202 SYSTEMS TYPE DE CODE IDENTIFICATION SPЙCIFIQUE B =Body C =Chassis P =Powertrain U =Network Gйnйrique (SAE) :
P0, P2, P34-P39 B0, B3 C0, C3 UD, U3 Dysfonctionnement Section des Systиmes 1 =Mesure du Carburant et de l'Air 2 =Mesure du Carburant et de l'Air 3 =Dйfauts du Systиme d'Allumage ou du Moteur 4 =Contrфle Auxiliaire des Йmissions 5 =Contrфle de la Vitesse du Vйhicule et du Ralenti 6 =Circuits de Sortie d'Ordinateur 7 =Contrфles de la Transmission 8 =Contrфles de la Transmission SOUS-SYSTИMES Spйcifique au Fabricant : P1, P30-P33 B1, B2 C1, C2 U1, U2 4