Map Sensor (Manifold Absolute Pressure Sensor) - ECU Master EMU User Manual

MAP sensor (manifold absolute pressure sensor)

Pressure sensors are used to measure pressure in the engine's intake manifold (MAP sensor) and
atmospheric pressure (baro sensor). MAP sensor fulfils the following functions:
1. In algorithm Speed Density determines the engine's load and is the basic parameter while
calculating the fuel's dose and the angle of ignition's timing.
2. In case of boost control in the feedback loop, the pressure's value in the intake collector is the
basic information for the algorithm.
3. Fuel cut, when the pressure value is very low or exceeds the maximum value (overboost fuel
cut).
4. BARO sensor is used to calibrate the fuel dose in case of algorithm Alpha-N
MAP sensor pressure should be taken from the intake manifold from the place closest to the
throttle, so that its value most closely matches the average pressure value in the intake manifold.
Pressure hoses should be as short as possible, with hard walls. In case of individual throttle
bodies, pressure from each runner should be connected to the collecting can and only then to the
MAP sensor. EMU device has an in-built pressure sensor with a measuring range of 400kPa, and a
built-in barometric pressure sensor. It is possible to use the external MAP sensor connected to one
of the analogue inputs.
Using the configuration of the MAP sensor we can decide whether to use the built-in sensor (Use
built in map) or the external one. In case of using the external sensor we should choose the
analogue input, to which we connect (Analogue input) and we enter its measuring scope 0 (MAP
range and MAP offset).
EMU
MAP
+5V
B23
Out
B3, B11, B20, B19
B18
GND
Wiring diagram of external MAP sensor
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