Diagnose
Status September 2003 (EvoBus-Service / AFT) Page: 60 of 83
4.1.15 Calculation of gas pressure
The gas pressure is calculated every 10 ms. The calculated pressure is smoothed with a low-pass filter.
The characteristic curve of the gas pressure sensor integrated in the engine control unit is stored in the
control unit software.
If the voltage of the gas pressure sensor is above 4.95 V or below 0.67 V for more than 2 seconds, then
the event "Fault measuring range exceeded or dropped below" is detected and the fault code 1715 or
1716 is entered. Then the substitute value of 8.5 bar is used as the gas pressure. If the fault debouncing
time has not yet expired, however the voltage value is outside the limits, the last gas pressure calculated
under valid conditions is retained.
Characteristic curve: Gas pressure sensor
SEN - P gas: sensor code (Gas pressure = f(voltage)
Gas pressure [bar] = f(Sensor voltage [V])
Pressure
Voltage
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