Map Airflow Pressure Sensor

This combo may also be found in setups where a larger maf may become too turbulent at low load and the maf is used at high load for more accuracy in a naturally aspirated motor.

Map airflow pressure sensor.

Symptoms of a bad or failing map sensor include. Engines that use a map sensor are typically fuel injected the manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine s electronic control unit ecu. The computer also measures the barometric pressure using the map sensor before the engine cranks this lets the computer compensate for altitude or how dense the air is. The data is used to calculate air density and determine the.

This map sensor is mounted directly to the intake manifold but others might be connected by a hose. Maf and map sensors. A failed map sensor has serious implications on fuel control vehicle tailpipe emissions and fuel economy. Then it translates this pressure into a voltage signal that the sensor feeds to the power control module pcm your car s computer.

Benji jerew flickr cc by 2 0. Map sensor and you. This is because the map sensor measures absolute pressure based on a perfect vacuum rather than atmospheric pressure. The manifold absolute pressure sensor map sensor is one of the sensors used in an internal combustion engine s electronic control system.

Basically a map sensor reads the amount of air pressure in relation to vacuum inside the intake manifold either directly or using a vacuum hose. The ecm uses map sensor data to run crucial calculations such as engine load fuel injector pulse and spark advance. When at rest the map sensor reads atmospheric pressure at sea level 29 93 in. The map sensor is usually mounted directly to the intake manifold somewhere after the throttle body though some are mounted on the firewall or elsewhere in the engine bay connected to the intake manifold via a vacuum line.

At 20 hg the map sensor will indicate about 5 psi. You can usually tell if you have a map sensor if you cannot find a maf sensor in the intake air tube before the throttle body. The ecm and the tcm monitor engine load through the map and maf sensors. A faulty map sensor affects engine performance but can also affect transmission s shift timing.

The map manifold absolute pressure sensor senses engine load through pressure in the intake manifold.