Four Different Conditions For Diagnostics

Trip 

When all diagnostic functions have been gone through.

Drive cycle 

Begins 15 seconds after the engine starts and finishes when the engine is switched off.

Warm-up cycle 

Begins when the engine starts and engine coolant temperature (ECT) is below 40°C (104°F) and finishes when the engine temperature is above 84°C (183.2°F).

Time 

Some diagnostics are carried out a set amount of time after a particular occurrence (for example when vehicle speed is above 23 km/h (14.3 mph)).