DTC Description

The pressure sensor signal has an offset which is given by the specified sensor offset, an offset due to the sensor wiring and an offset due to the signal conditioning circuit in the ECU.

The total pressure sensor signal offset is calculated by low pass filtering the sensor signal and it is stored in the non-volatile memory of the ECU. After each power-on reset the offset calculation starts with the stored offset value of the last ignition cycle. A failure is detected if the calculated pressure sensor signal offset is out of range.

The pressure sensor signal is filtered by a hardware low-pass filter in the ECU. This filtered signal is then connected to an A/D converter. The MCU reads the pressure sensor signal once per loop from the A/D converter.

A failure is detected if the pressure sensor signal noise is out of valid range or there is too high difference between both pressure sensor signals.