MAP Sensor

The manifold absolute pressure (MAP) sensor is a device that calculates the amount of air pressure that goes into the intake manifold. The sensor sends information to the engine control unit (ECU) to adjust the fuel injectors to equal the air in the cylinders.

MAP sensor principle

The MAP sensor is one of the sensors that is utilized in an internal combustion engine electronic control system. The engines that utilize the MAP sensor are usually fuel injected. The sensor gives manifold pressure data to the ECU, and the information is used to measure the air density and regulate the engine's flow rate. It controls the necessary fuel metering for the best combustion and impact of the ignition timing.

EGR testing

Some vehicle manufacturers require to test the exhaust gas recirculation to see if it operates properly while driving. The MAP sensor is utilized by manufacturers to accomplish the test. You will know if the EGR is working properly because there will be an increase in the Manifold absolute pressure as exhaust gases enter.

Common problems with a faulty MAP sensor

A faulty sensor can cause poor fuel economy, a decline in power, and rough idle.