Map Airflow Pressure Sensor

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.

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. At 20 hg the map sensor will indicate about 5 psi. Benji jerew flickr cc by 2 0. 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 map manifold absolute pressure sensor senses engine load through pressure in the intake manifold. The computer may be using the map sensor to measure only the positive air pressure coming from a turbocharger or supercharger. This map sensor is mounted directly to the intake manifold but others might be connected by a hose. A faulty map sensor affects engine performance but can also affect transmission s shift timing.

Then it translates this pressure into a voltage signal that the sensor feeds to the power control module pcm your car s computer. When at rest the map sensor reads atmospheric pressure at sea level 29 93 in. Maf and map sensors. This is because the map sensor measures absolute pressure based on a perfect vacuum rather than atmospheric pressure.

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. Map sensor and you. The manifold absolute pressure sensor map sensor is one of the sensors used in an internal combustion engine s electronic control system. A failed map sensor has serious implications on fuel control vehicle tailpipe emissions and fuel economy.

The ecm and the tcm monitor engine load through the map and maf sensors. Symptoms of a bad or failing map sensor include. The data is used to calculate air density and determine the. In fuel injected automotive engines a manifold absolute pressure map sensor is used to continuously monitor the amount of air flowing into the engine so the computer can calculate air density adjust the amount of fuel to spray into the combustion chamber and adjust the ignition timing.

The ecm uses map sensor data to run crucial calculations such as engine load fuel injector pulse and spark advance.