Characteristic curve and setpoint values
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The frequency of the PWM signal of 50 to 150 Hz corresponds to an ethanol content of 0 % to 100 % with an accuracy of ±5 %. Frequencies between 170 and 190 Hz are reserved for ethanol sensor faults. The temperature is also transferred with the pulse-width modulated signal as part of the duration of the low signal. In this process, a low signal duration of 1 ms corresponds to - 40 °C and a low signal of 5 ms corresponds to 125 °C.
| Item | Explanation |
|---|---|
| 1 | PWM signal frequency |
| 2 | Ethanol content curve |
| 3 | Percent |
Note the following specified values for the ethanol sensor:
| Variable | Value |
|---|---|
| Supply voltage | 9 to 18 volts |
| Maximum fuel pressure | 15 mA |
| Fuel temperature | -40 °C to 130 °C |
| Temperature range | -40 °C to 125 °C |