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.
A/D Converters: Notes
Analogue/Digital Converters convert analogue sensor values to digital values that the CPU can read (via the Input/Output unit). Converts in 256 steps as this corresponds to one byte or 8 bits.
8 leads go between the A/D converter for a temperature sensor, for example, and the Input/Output unit. If all are 0 (no voltage), it means that voltage over the NTC resistor is 0 V. See VOLTAGE SPECIFICATIONS .
| NTC voltage (V) | Digital (binary) | Decimal |
|---|---|---|
| 0 | 00000000 | 0 |
| 0.02 | 00000001 | 1 |
| 0.04 | 00000010 | 2 |
| 0.06 | 00000011 | 3 |
| 0 | 00000011 | 3 |
| 0.08 | 00000100 | 4 |
| 0.1 | 00000101 | 5 |
| 0.12 | 00000110 | 6 |
| 0.14 | 00000111 | 7 |
| 0.16 | 00001000 | 8 |
| ... | ... | ... |
| 5.00 | 11111111 | 255 |
Some control modules have analogue inputs with 10-bit conversion. The advantage is improved accuracy or resolution. Resolution doubles with each extra bit.
10 bits means 1024 steps for an analogue sensor. This is used for pedal position sensors, for example. In most cases, however, 8-bit conversion is sufficient. 256 steps is sufficient for a tank sensor, for example.
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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.
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