1. A phase of "the closed regulation chain".

Regulation of composition of working mix begins спутя some time after start of the engine if temperature of cooling liquid is above 10 °C (cars with the mechanical transmission) and 25 °C (cars with the automatic transmission).

2. Phase of "disconnection of a chain of regulation".

At regulation of composition of fuel mix EBU does not consider sensor signal tension size in the following cases:

– when pressing against the stop an accelerator pedal;

– at considerable loadings and high frequency of rotation of a bent shaft;

– at delay if there is information on the released accelerator pedal;

– at failure of the oxygen sensor.