Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Characteristic curve and setpoint values
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 |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.