[amidgeha]

Manifold Absolute Pressure/Barometric Pressure Circuit Low

The Manifold Absolute Pressure (MAP) sensor provides instantaneous manifold pressure information to the engine"s Engine Control Module (ECM). The data is used to calculate air density and determine the engine"s air mass flow rate, which in turn determines the required fuel metering for optimum combustion. A fuel-injected engine may alternately use a Mass Air Flow (MAF) sensor to detect the intake airflow.

Cause:
Faulty Manifold Absolute Pressure sensor
Manifold Absolute Pressure harness is open or shorted
Manifold Absolute Pressure sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

Symptoms:
Check engine light
Engine rough idle
Engine hesitation