If a scan tool indicates that a MAP sensor is out of range, what does this signify?

When a scan tool indicates that a MAP sensor is out of range, it specifically means that the manifold absolute pressure measurement is experiencing issues. The MAP sensor is crucial for determining the engine load by measuring the pressure within the intake manifold. This information is essential for the engine control module (ECM) to adjust fuel delivery and ignition timing appropriately.

If the MAP sensor is reporting pressure values that are outside of the expected range, it can lead to incorrect calculations related to fuel mixture and engine performance. Such discrepancies can result in running conditions that either lean or rich fuel mixtures, thus affecting engine efficiency and emissions. In this context, the statement directly addresses the primary function of the MAP sensor and the implications of its malfunction, confirming that the manifold absolute pressure measurement is incorrect.