Manifold absolute pressure (MAP) sensor

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Volvo V70, 2006 Volvo V70, 2005 Volvo V70, 2004 Volvo V70, and 2003 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Manifold Absolute Pressure Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The manifold absolute pressure (MAP) sensor is on top of the radiator and is connected to the intake manifold by a hose.

The manifold absolute pressure (MAP) sensor detects quick pressure changes in the intake manifold after the throttle. The signal from the sensor is used by the engine control module (ECM) to supplement the mass air flow (MAF) sensor when calculating injection period.

The semi-conductor sensor is grounded in the control module and is supplied with power from the control module.

As the pressure in the intake manifold varies, the position of the silicone membrane in the sensor changes. This generates a signal to the engine control module (ECM). Low pressure produces low voltage, high pressure produces high voltage.

The engine control module (ECM) can diagnose the manifold absolute pressure (MAP) sensor. The sensor signal can be read using VIDA.