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.
Sensor Resistance Table (Ambient Air Temp Sensor)
The Tech 2 will display sensor value as a voltage. This gives the approximate voltage expected at different ambient temperatures as well as what should be read with an ohmmeter connected to the sensor. Since this is raw data any heat from underhood that changes ambient temp around the sensor might skew the reading, so let the engine compartment cool.
| Voltage Tech 2 (V) | R Nominal (k ohms) | Outside Air Temp (°F) | Outside Air Temp (°C) |
|---|---|---|---|
| - | Input OPEN or SHORT to battery | - | - |
| 4.7 | 169.4 | -40 | -40 |
| 4.5 | 88.74 | -22 | -30 |
| 4.1 | 48.58 | -4 | -20 |
| 3.7 | 27.67 | 14 | -10 |
| 3.1 | 16.33 | 32 | 0 |
| 2.5 | 9.951 | 50 | 10 |
| 1.9 | 6.246 | 68 | 20 |
| 1.4 | 4.028 | 86 | 30 |
| 1.0 | 2.663 | 104 | 40 |
| 0.7 | 1.801 | 122 | 50 |
| 0.5 | 1.245 | 140 | 60 |
| 0.4 | 0.8772 | 158 | 70 |
| - | Input SHORT to ground | - | - |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.