Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection

Fig. 91 Intake air thermo sensor terminal identification.:

1. Remove air cleaner upper cover assembly.
2. Heat intake air thermo sensor and observe temperature.
3. Check resistance between terminals E2 and THA, Fig. 91. There should be 10,000-20,000 ohms at - 4°F, 2000-3000 ohms at 68°H and 400-700 ohms at 140°F.
4. If resistance is not as described, replace air flow meter assembly.
5. If resistance is as described, check wiring harnesses.