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.
Manifold Air Temperature (MAT) Sensor
On some models, MAT sensor may also be referred to as a Intake Air Temperature (IAT) sensor. If a MAT sensor related code is present, see appropriate G - TBI TESTS W/ CODES (for Throttle Body Injected models) and G - PFI TESTS W/ CODES (for Port Fuel Injected models) articles in this section.
An out-of-calibration sensor may not set a trouble code. Use following procedure to test calibration. Disconnect MAT sensor harness connector. Connect ohmmeter between sensor terminals. Sensor resistance should be as specified. See the MAT SENSOR RESISTANCE table. After vehicle has sat overnight, MAT sensor and coolant sensor should have close to the same resistance reading.
| °F (°C) | Ohms |
|---|---|
| 210 (100) | 185 |
| 160 (70) | 450 |
| 100 (38) | 1800 |
| 70 (20) | 3400 |
| 40 (4) | 7500 |
| 20 (-7) | 13,500 |
| 0 (-18) | 25,000 |
| -40 (-40) | 100,700 |
NO RELATED
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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.