Manifold Air Temperature (MAT) Sensor
- Disconnect wire harness connector from MAT sensor. Using a DVOM, sensor resistance should be less than 1000 ohms with engine at operating temperature.
- Check resistance between ECU terminal "C8" and sensor connector and ECU terminal "D3" and sensor connector. See Figure . Repair wiring harness if resistance is more than one ohm. Refer to MANIFOLD AIR TEMPERATURE SENSOR RESISTANCE table. Replace sensor if not within specification.
MANIFOLD AIR TEMPERATURE SENSOR RESISTANCE - APPROXIMATE
| °F (°C) | Ohms |
|---|---|
| 212 (100) | 185 |
| 160 (70) | 450 |
| 100 (38) | 1600 |
| 70 (20) | 3400 |
| 40 (4) | 7500 |
| 20 (-7) | 13,500 |
| 0 (-18) | 25,500 |
| -40 (-40) | 100,700 |