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.