LEV/OBD II

LEV/OBD II

Definitions

Trip
Starting the engine and then driving in such a way that all the components and functions included in OBD II have been covered.

Driving cycle
Starting the engine.

Heating cycle
Starting the engine and then increasing engine temperature by at least 22 degrees C (40 degrees F) to at least 71 degrees C (160 degrees F).

Similar operating conditions
^ engine speed ± 375 rpm
^ engine load ± 10%
^ same heating status (below or above 71 degrees C (160 degrees F))

Entry conditions
Conditions that must be met before a diagnosis is carried out.

Fault criteria
Once the entry conditions have been met, the diagnosis will check whether the fault criteria have been met.

Dependencies
Once the fault criteria have been met, there are a number of other diagnoses that must report OK before the DTC is finally generated.

System reactions to a fault
Once the fault criteria have been met, certain measures will occasionally be taken.

OK report
The diagnosis can constitute a dependency in another diagnosis and must therefore report OK even if it should be continuous. The OK report is also used in fault handling for decrementing the fault counter.