Diagnose
Status September 2003 (EvoBus-Service / AFT) Page: 64 of 83
4.1.20 Atmospheric air pressure
The atmospheric air pressure is calculated every 40 ms. The calculated pressure is smoothed with a low-
pass filter. The characteristic curve of the atmospheric pressure sensor integrated in the engine control
unit is stored in the control unit software.
If the voltage of the atmospheric pressure sensor is above 4.75 V or below 2.30 V for more than 2
seconds, then the event "Fault measuring range exceeded or dropped below" is detected and the fault
code 1315 or 1316 is entered. A substitute value of 950 mbar is used as the atmospheric air pressure. If
the fault debouncing time has not yet expired, however the voltage value is outside the limits, the last
atmospheric pressure calculated under valid conditions is retained.
Characteristic curve: Atmospheric pressure sensor
SEN - P atmosphere: sensor code
Atmospheric pressure [bar] = f(Sensor voltage [V])
Atmospheric pressure
Voltage
To Next Page
Loading...
Need help?
General
