The gauge of a measuring instrument of the expense of air is located on an air inlet branch pipe. Air stream arrives in the engine through a measuring instrument with нагретым the wire element forming a part of the bridge scheme. The current passing through this wire element, maintains its constant temperature at constant level, which above, than temperature of air arriving in the engine. The weight of air is defined on a current strength. The pressure signal is processed in the block of engine management in parallel with parametre of frequency of rotation of a cranked shaft. The temperature gauge is established in a measuring instrument of the expense of air that the target signal did not depend on temperature of air arriving in the engine. On the basis of the information from the gauge, the engine management block calculates width of the impulse submitted on atomizers therefore the quantity of fuel of the engine submitted to cylinders changes.
Replacement of the gauge of a measuring instrument of the expense of air (MAF) on models since 2001 make as follows:
– Switch off ignition and disconnect a wire of "weight" from the storage battery;
– Disconnect from the gauge an electric socket;
Fig. 7.9. An arrangement of screws of fastening the gauge of a measuring instrument of the expense of air
– Turn out 2 screws and remove the gauge of a measuring instrument of the expense of air with sealing rings (fig. 7.9
Installation spend to sequences, return to removal. At gauge installation use new sealing rings.