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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°C (40°F) to at least 71°C (160°F).


Similar operating conditions

• engine speed ±375 rpm

• engine load ±10%

• same heating status (below or above 71°C (160°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.