- engine intake tract;
- exhaust system;
- fuel vapor recovery system (including purge solenoid valve);
- injectors;
- fuel pressure regulator;
- fuel pump.
In order for the air-fuel ratio in the mixture to be within the specified limits, the operating parameters of all elements and systems associated with the mixture control system must comply with the standard.
Conditions for storing fault codes (short-term mixture control)
The ECU stores one of the fault codes and illuminates the engine management system malfunction indicator lamp if, within 30 seconds in two driving cycles, the short-term fuel mixture control value changes by 10-15% towards richness (for P01123) or if the additional short-term fuel mixture control value changes by 10-15% towards leanness for less than 0.4 milliseconds, and the following conditions are met:
- The ECU operates in a closed control loop;
- engine crankshaft speed below 1000 min⁻¹;
- coolant temperature above 70°C;
- the purge system of the adsorber does not work;
- the mass air flow is less than 7.5 g/s (at P01123) or 5.5 g/s (at P1124).
Conditions for storing fault codes (long-term mixture control)
The ECU stores one of the fault codes and turns on the engine management system malfunction indicator lamp if, in two driving cycles, the multiplicative control value for 30 s is less than 77% (for P01127) or if the long-term fuel-air ratio control value for 30 s changes by 10-15% towards leaner (for P01128) under the following conditions:
- engine load greater than 1.8 ms;
- The ECU operates in a closed control loop (at P01127);
- coolant temperature above 70°C;
- the purge system of the adsorber does not work;
- mass air flow rate no more than 5.5 g/s;
- engine crankshaft speed below 1000 min⁻¹.