- intake tract of the engine;
- exhaust system;
- vapor recovery system (including canister purge solenoid valve);
- nozzles;
- fuel pressure control;
- fuel pump.
In order for the ratio of air and fuel in the mixture to be within the specified limits, the operating parameters of all elements and systems associated with the system for regulating the composition of the working mixture must comply with the norm.
Conditions for storing fault codes (short term mixture control)
The ECU memorizes one of the fault codes and turns on the engine management system malfunction indicator lamp if the short-term mixture control value changes by 10-15% towards richness within 30 seconds in two driving cycles (for P01123) or if the additional value of short-term regulation is less than 0.4 milliseconds, or changes by 10-15% towards lean under the following conditions:
- The ECU operates in a closed control loop;
- engine speed below 1000 min-1;
- coolant temperature above 70°C;
- adsorber purge system does not work;
- mass air flow 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 memorizes 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 seconds is less than 77% (at P01127) or if the value of the long-term control of the composition of the mixture within 30 seconds changes by 10-15% towards lean (at P01128) subject to the following conditions:
- motor load is greater than 1.8 ms;
- The ECU operates in a closed control loop (at P01127);
- coolant temperature above 70°C;
- adsorber purge system does not work;
- mass air flow not more than 5.5 g/s;
- engine speed is below 1000 min-1.