Generation of DTCs

NOTE: DTCs are generated when the above fault criteria are fulfilled and the dependents are OK. In addition, for Test 2 (Warm Start) the intake air temperature has not been below 5°C.

Fuel level, Plausibility diagnosis: Because fuel level is used as an enable criteria in certain diagnosis, then the control module must know that fuel level value is plausible. It works in such a way that ECM receives the bus message "Fuel level XX liter" from MIU. While driving ECM observes the value and as the vehicle is driving it is consuming gasoline, ECM sees that the fuel level value will fall. In ECM there is a number of filtrations of the value so as to avoid inaccuracies due to for example splashing fuel in the tank and hill starts. The fuel level diagnosis can be said to be a support diagnosis, it does not generate its own DTCs, but if for example the integrity diagnosis has reported a leakage in the purging valve then DTC P0455 is normally generated. If on the other hand the integrity diagnosis has reported the same fault and the fuel level diagnosis at the same time has also reported a fault then DTC P1455 is generated instead.

DTCs P0441, P1441 are generated if faults are reported during Phase A.
DTCs P0455, P1455 are generated if faults are reported during Phase B.
DTCs P0442, P1442 are generated if faults are reported during Phase C.