Contents: Terms and Conditions 🠛 Pressure ranges passed during testing 🠛 Interpretation of values obtained…🠛
In a closed control loop, the ECU, when regulating the mixture composition, adjusts the injection duration in such a way as to obtain a dosage as close as possible to mixture composition 1.
The correction value is close to 128, and the extreme values are 0 and 255.
Adaptive fuel-air mixture correction allows you to adjust the injection algorithm so as to obtain a fuel-air mixture correction value equal to 128.
Adaptive corrections take 128 as the mean value after initialization (erasing information from memory) and have the following extreme values.
Terms and Conditions
Hot engine: coolant temperature above 70°C for F4P engine and 80°C for K4M engine.
Engine speed must not exceed 4000 min⁻¹ for the F4P engine and 4640 min⁻¹ for the K4M engine,
Disconnect the absorber by disconnecting the wiring block from the electromagnetic valve, or plug the fuel supply line to the engine.
[This note was copied from the resource: renaultbook.ru]
Pressure ranges passed during testing
There are five pressure ranges to check during the trip. These ranges are set by the following calibrations.
Termination of correction during prolonged regulation when the hot engine is idling.
If the coolant temperature is above 80°C at idle speed 8 for more than 62 s, the correction parameters are fixed until the end of idle speed.
After this test, the correction values become effective. The test should be continued on the move, driving under normal conditions at a constant and variable speed for a distance of 5-10 km. After the test, check the correction values. The initial values of 128 should have changed. Otherwise, repeat the test, strictly observing the conditions for its implementation.
Interpretation of values obtained during road testing
When there is a shortage of fuel (due to contamination of injectors, low pressure and fuel supply, etc.), the fuel mixture control parameters are increased in such a way as to obtain a mixture composition as close as possible to 1. At the same time, the adaptive correction of the working mixture composition is increased so that the mixture composition correction value fluctuates around 128. With excess fuel, everything happens the other way around.
