DeVille DHS V8-4.6L VIN Y (2000)
Mass Air Flow (MAF) Sensor: Description and Operation
Mass Air Flow (MAF) Sensor
The Mass Air Flow (MAF) sensor measures the amount of air flow into the engine in a given time. The MAF sensor produces a signal as air passes
through the sensor and into the engine. The amount of air flow determines the frequency of the signal. If the air flow through the sensor increases, the
frequency of the signal will increase. If the air flow through the sensor decreases, the frequency of the signal will decrease. Normally, the frequency will
vary from approximately 2000 hertz at idle to about 10,000 hertz at maximum engine load. The PCM uses the MAF sensor information to provide the
correct fuel delivery for all engine operating conditions.
The scan tool displays the MAF value in grams per second (g/s). At idle, the scan tool should display a MAF value of 4 g/s - 7 g/s on a fully warmed
engine. Values should change rather quickly on acceleration. However, the values should remain fairly stable at any given RPM.
If the PCM detects a signal frequency lower than the possible range of a normally operating MAF sensor, DTC P0102 will set. If the PCM detects a
signal frequency higher than the possible range of a normally operating MAF sensor, DTC P0103 will set. If the actual MAF sensor frequency does not
match a PCM calculated MAF value, DTC P0101 will set.
