Manifold Air Temperature (Mat) Sensor Test

Disconnect wire harness connector from MAT sensor. The MAT sensor is installed in throttle body adapter, at rear of intake manifold. 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 ⁽¹⁾

°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

⁽¹⁾	Values given are approximate.