Manifold Absolute Pressure (MAP)

Range 10 - 104 kPa
The Manifold Absolute Pressure (MAP) sensor measures the change in intake manifold pressure caused by engine load and engine speed changes. During WOT, MAP will be maximum. During decel, vacuum will be high in the intake and MAP will be displayed at its minimum pressure.

Range 0.0 - 5.0 Volts
The MAP sensor produces a low signal voltage when the manifold pressure is low. A low MAP voltage indicates a high vacuum in the intake manifold. The MAP sensor produces a high signal voltage when the manifold pressure is high. A high MAP voltage indicates a low vacuum in the intake manifold. With the ignition ON and the engine OFF, the manifold pressure equals the ambient atmospheric pressure. This will produce a relatively high MAP signal voltage. The VCM uses this information as an indication of the vehicle's altitude. This parameter is referred to as the BARO.