Function of the manifold pressure (MAP) sensor

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MAP Sensors

MAP sensor diagram

The Manifold Pressure Sensor is used in an engine's electronic control system. Engines that use a pressure sensor are typically fuel injected. The sensor provides instant manifold pressure information to the engine's electronic control unit. The data is used to calculate air density and determine the engine's air mass flow rate, which in turn determines the required fuel delivery for perfect combustion. A fuel-injected engine may use a MAF sensor or a Pressure sensor-- or sometimes even both-- to detect the intake airflow. 

The Manifold Pressure Sensor can be used for diagnostics as it measures the throttle performance, turbo performance and can be used to detect leaks in the inlet manifold. Because of its position it should always read a negative pressure unless the turbo charger is boosting pressure. This can be seen in the attached diagram.

Abbreviations for MAP sensors

Common Names for the Manifold Pressure Sensor are: 

  • Manifold Absolute Pressure Sensor
  • Engine Load Sensor
  • Pressure Sensor
  • Boost Sensor

Abbreviations often used are:

  • MAP

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