Desired Pintle Position

The desired pintle position is the result of computations performed by the PCM using various inputs such as engine speed, intake manifold temperature and pressure, air flow, and engine coolant temperature, and stored calibrations from the PCM EPROM. By continuously computing the desired pintle position, the PCM can vary EGR flow for particular driving conditions.

The PCM calculates pintle position error, desired pintle position minus normalized pintle position, to determine if it is accurately controlling EGR flow. If the pintle position error exceeds 25 counts for more than 10 seconds, the PCM will set a diagnostic trouble code.