Intake Air Temperature (IAT) Sensor
- Disconnect IAT sensor connector. Turn ignition on. Check voltage between ground and Red/Black wire terminal of connector. If voltage is not 4-5 volts, check wiring harness for an open or short. If voltage is 4-5 volts, go to next step.
- Remove IAT sensor and place in container of water with a thermometer. Heat water to specified temperature and check resistance. See INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE table. Replace IAT sensor if resistance is not within specification.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE
| Temperature °F (°C) | Ohms |
|---|---|
| 0 (-18) | 14,800 |
| 20 (-7) | 8250 |
| 40 (4) | 5200 |
| 70 (21) | 2500 |
| 100 (38) | 1300 |
| 160 (71) | 450 |
| 210 (99) | 200 |