The Power Train Control Module (PCM) sends a 5-volt reference signal to the Manifold Absolute Pressure (MAP) sensor, similarly providing a ground circuit. As the manifold pressure changes with the load, the MAP (Manifold Absolute Pressure) sensor informs the PCM (Powertrain Control Module).
When the vehicle is idling the voltage should be from 1 to 1.5 volts and approximately 4.5 volts when the vehicle accelerates completely. The Power Train Control Module (PCM) looks for any variation in manifold pressure by a change in the engine load, either in changes of the engine speed, in the throttle angle or in the EGR system (Exhaust Gas Recirculation).
In case the PCM does not see any of these factors, it changes, but if on the contrary it detects a rapid change in the value of the map, the DTC code P0106 is obtained.