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.
Sensor Resistance Table (Ambient Air Temp Sensor)
| 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 | - | - |