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 knock sensor shows linear characteristics in the frequency range up to around 20 kHz. The resonance frequency of the sensor itself lies at a significantly higher frequency (greater than 30 kHz). The knocking noises that usually occur in the engine have frequencies of around 7 kHz.
| Index | Explanation |
|---|---|
| 1 | Voltage |
| 2 | Signal without knocking |
| 3 | Signal with knocking |
| 4 | Frequency |
Observe the following setpoint values for the crankshaft sensor:
| Size | Value |
|---|---|
| Voltage range | 4.5 to 5.5 volts |
| Frequency range | 7 to 25 kHz |
| Maximum output current | 20 mA |
| Ambient temperature | -40 °C to 140 °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.