Sensors MAP

Manifold absolute pressure

The map sensor reads the amount of pressure against vacuum, creating a balance between the air/fuel ratio, ensuring a safe and smooth idle, accelerate and decceleration

3 wire map :

5v input, earth wire, signal wire

The signal wire sends a voltage related signal to the engines ECU which calculates; in relation to the TPS, how much fuel to inject into the cylinders.

vacuum is high when at idle or the engine is deccelerating as the throttle will be closed so the map will give a low voltage reading, but when the engine is at wot or accelerating the voltage reading is high as the vacuum decreases and pressure increased.