Diagnose
Status September 2003 (EvoBus-Service / AFT) Page: 59 of 83
4.1.14 Gas temperature
The gas temperature is calculated every 40 ms. The calculated temperature is smoothed with a low-pass
filter. The characteristic curve of the gas temperature sensor is stored in the engine data record. If the
voltage of the gas temperature sensor is above 4.95 V or below 0.35 V for more than 2 seconds, then the
event "Fault measuring range exceeded or dropped below" is detected and the fault code 1115 or 1116 is
entered. Then the substitute value of 30 °C is used as the gas temperature. If the fault debouncing time
has not yet expired, however the voltage value is outside the limits, the last gas temperature calculated
under valid conditions is retained. In the case of a fault, the measured value on the CAN is also set to
"Signal not available".
Characteristic curve: Gas temperature sensor
SEN - T gas: sensor code
Gas temperature [°C] = f(Sensor voltage [V])
Gas temperature
Voltage
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