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The hot film MAF sensor works somewhat similar to the hot wire MAF sensor, but instead it usually outputs a frequency signal. This sensor uses a hot film-grid instead of a hot wire. [3] It is commonly found in late 1980s and early 1990s fuel-injected vehicles. The output frequency is directly proportional to the air mass entering the engine.
MAFless tuned LS engine equipped vehicles never eventuated in the United States as the C5 Corvette with the same engine was always fitted with a MAF sensor. It featured a larger MAF sensor body than the ones installed in the Australian cars, to avoid any intake restriction issues and still deliver accurate injection at all times.
It is a one-to-one relationship with an offset of -100 kPa for boost pressure. Thus, a MAP sensor will always read 100 kPa more than a boost sensor measuring the same conditions. A MAP sensor will never display a negative reading because it is measuring absolute pressure, where zero is the total absence of pressure.
To manufacture a check-engine light, we unplugged the mass-airflow sensor on the Corolla, started the car, and verified that the light was on. Then we plugged in each scanner and evaluated the ...
These vehicles have a MAF sensor, Air Temperature sensor, and when equipped with the 2.3L 4-cylinder, two spark-plugs per cylinder. This combination ensures the air is just warm enough to vaporize the droplets and does very noticeably improve performance and emissions at the same time in cold, northern winter weather. [citation needed]
In many late model automobiles, a Mass Airflow (MAF) sensor is used to accurately determine the mass flow rate of intake air used in the internal combustion engine. Many such mass flow sensors use a heated element and a downstream temperature sensor to indicate the air flowrate. Other sensors use a spring-loaded vane.
Delco ECU used in General Motors vehicles built in 1996. An engine control unit (ECU), also called an engine control module (ECM), [1] is a device that controls various subsystems of an internal combustion engine.
Clutch pedal sensor - operates with cruise control, exhaust brake, idle control; Accelerator pedal sensor; Driver input switches - cruise control, idle increase /decrease, engine/exhaust brake; Injector needle movement sensor - monitors the actual injection time and feeds the information to the ECU (as used on VM Motori 2.5 and 3.1 engines)