P0069 Manifold Absolute Pressure – Barometric Pressure Correlation
P0069 – Manifold absolute pressure (MAP) sensor/barometric pressure (BARO) sensor correlation By Mia Bevacqua ASE Master Tech Trouble Code Fault Location Probable Cause P0069 Manifold absolute pressure (MAP) sensor/barometric pressure (BARO) sensor correlation MAP sensor, mechanical fault What Does P0069 Mean? The manifold absolute pressure (MAP) sensor is used to measure engine load. The powertrain control module (PCM) sends the MAP sensor a reference voltage and the sensor varies the voltage according to manifold vacuum. The PCM then uses this information to adjust ignition timing and fuel delivery. An example of a MAP sensor (Courtesy: autozone.com ) Vacuum and pressure are inversely proportional (when vacuum goes up, pressure goes down). Because of this, the MAP sensor is able to measure the pressure in the intake manifold to gauge vacuum. Manifold vacuum is a good indicator of engine load. With the engine off, manifold pressure and a...