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.
1990 Audi 100 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Sensor Range Charts
NOTE:
All voltage tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.
COOLANT TEMPERATURE SENSOR RESISTANCE TEST
| Temperature | Ohms |
|---|---|
| 68°F (20°C) | 2200-2600 |
| 104°F (40°C) | 1000-1400 |
| 176°F (80°C) | 285-315 |
| 212°F (100°C) | 180-220 |
AIR TEMPERATURE SENSOR RESISTANCE
| Temperature | Ohms | |
|---|---|---|
| CIS Digital Control | ||
| 68°F (20°C) | 400-700 | |
Factory Service Tools
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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.