DTC P0068-00: MAP (MAF) - Throttle Position Sensor Correlation: General Description

WARNING: This page is about a different car, the 2025 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.

The amount of intake air flow must be inputted to the PCM in order to determine the fuel injection quantity. The Manifold Absolute Pressure Sensor (MAPS) calculates the amount of air indirectly as measuring pressure inside of the intake manifold. This mechanism is called speed-density type.

The Manifold Absolute Pressure Sensor (MAPS) transfers analog output signal which is proportional to the change of intake manifold pressure, then, with this signal and RPM, the PCM calculates the amount of intake air flow.

The MAPS is mounted on the intake manifold to measure the pressure inside of the intake manifold, and it consists of a piezo electric element and hybrid IC which amplifies output Signal from the element. The piezo electric element is a sort of a diaphragm using piezo electric effect. One side of the diaphragm is surrounded with vacuum chamber while intake pressure is applied to the other side. Thus, signals are output by the transformation of diaphragm according to change of pressure inside of the intake manifold.