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Engine Management – V6 – General Information Page 6C1-1–34
Construction Projecting into the MAF sensor body is the compact design • the sensor element (2), • partial airflow measuring tube (3), and • integrated evaluation electronics (4). Figure 6C1-1 – 45 Operation A diaphragm (1) on the sensor element (2) is heated by a Temperature of the diaphragm is registered to the With no air flow through the air flow measuring tube and As air flows over the sensor element, the upstream resistor Figure 6C1-1 – 46 The air then passes over the downstream resistor and alters the resistance value, but as the air temperature is higher, It is this differential that is used to calculate the air mass flow, which is independent of absolute temperature. The As the evaluation electronics are measuring the resistance differential between the resistors, the air mass flow for the The ECM can also detect air flow that is inappropriate for a given operating condition based on the signal voltage, or a Tech 2 can display the MAF value in grams per second (g/s). Values should change rather quickly on acceleration, but |