Manifold Absolute Pressure Sensor (MAP)
To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault:
*Unusually high/low barometric pressure.
*Kinked or obstructed vacuum lines (MAP).
*Basic engine (valves, vacuum leaks, timing, EGR valve, etc.).
The Manifold Absolute Pressure (MAP) sensor operates as a piezoelectric (pressure-sensing) disc. However, rather than generating a voltage, its output is a frequency change. The sensor changes frequency relative to intake manifold vacuum. The sensor frequency increases as vacuum increases. The MAP sensor allows the PCM to determine what the engine load is. Its signal affects air/fuel ratio, ignition timing, EGR flow and altitude compensation.
Manifold Absolute Pressure Sensor
29.92 inHg= Sea Level