On the M67TÜ, an ambient-pressure sensor is integrated in each of the two DDE control units. The ambient-pressure sensor cannot be replaced separately.
The ambient pressure serves as a measured variable for the following functions:
If one of the two ambient-pressure sensors is detected as defective, one or more of the following faults are stored in the corresponding DDE control unit:
In this case, a substitute value calculated from the turbo pressure is used or, if the turbo pressure sensor is defective, a substitute value is output.