Neon R/T L4-2.0L VIN F HO (2001)
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Decel fuel shutoff
The PCM recognizes a decrease in manifold pressure by monitoring a decrease in voltage from the reading stored in the barometric pressure memory
cell. The MAP sensor is a linear sensor; as pressure changes, voltage changes proportionately. The range of voltage output from the sensor is usually
between 4.6 volts at sea level to as low as 0.3 volts at 26 in. of Hg. Barometric pressure is the pressure exerted by the atmosphere upon an object. At sea
level on a standard day, no storm, barometric pressure is 29.92 in Hg. For every 100 feet of altitude barometric pressure drops 0.10 in. Hg. If a storm
goes through it can either add, high pressure, or decrease, low pressure, from what should be present for that altitude. You should make a habit of
knowing what the average pressure and corresponding barometric pressure is for your area.
