The MAP sensor provides the PCM with boost pressure information.

The MAP sensor provides the PCM with boost pressure information.

• A. Boost pressure sensor
• B. MAP sensor
• C. Throttle position sensor
• D. Mass airflow sensor

Answer: (B)

Manifold absolute pressure is what the PCM uses to gauge engine load and determine fueling. The MAP sensor is the sensor that reports this pressure inside the intake manifold to the PCM. In a boosted engine, the manifold pressure rises above atmospheric pressure when the turbo or supercharger adds boost, and the MAP sensor detects that increase, giving the PCM the boost information it needs to adjust fuel delivery and ignition timing. Other sensors measure different things: a boost pressure sensor (if present) is a separate device for boost data, the throttle position sensor tracks throttle opening, and the mass airflow sensor measures the air entering the engine.

Manifold absolute pressure is what the PCM uses to gauge engine load and determine fueling. The MAP sensor is the sensor that reports this pressure inside the intake manifold to the PCM. In a boosted engine, the manifold pressure rises above atmospheric pressure when the turbo or supercharger adds boost, and the MAP sensor detects that increase, giving the PCM the boost information it needs to adjust fuel delivery and ignition timing. Other sensors measure different things: a boost pressure sensor (if present) is a separate device for boost data, the throttle position sensor tracks throttle opening, and the mass airflow sensor measures the air entering the engine.