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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.
This requires the use of an alternative method of calculating airflow into the engine, which is also referred to as 'Speed-Density' system, as opposed to a MAF system. On vehicles so equipped, this alternative involves the use of a manifold absolute pressure, or MAP, sensor. The MAP sensor measures pressure in the engine's inlet manifold.
By using a blow-through method, the MAF won't be affected by the blowoff valve opening, since the pressure is vented before the air reaches the MAF. Other solutions include using a blowoff valve that recirculates the air back into the intake or using a manifold absolute pressure sensor (instead of an airflow sensor) to determine the amount of ...
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.
The 2004–2011 CVPI is rated for 186.5 kW (254 PS; 250 hp) @4,900 RPM. This better-flowing air intake system also has an integrated 80 mm (3.1 in) mass airflow (MAF) sensor that is part of the airbox lid (but can be serviced individually). This allows for much more precise flow calibration and reduces the chances of air leakage.
Did your vehicle's Check Engine light just pop on? An OBD-II scanner can provide some direction. We tested 11 of them to find the best for different situations.