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Manifold Air Temperature (Mat) Sensor Test
- Disconnect the MAT wire harness connector from the MAT sensor. See Fig 1
*.
Courtesy of CHRYSLER MOTORS.
- Using a high input impedance (digital) volt-ohmmeter, test the resistance of the sensor. Resistance should be less than l000 ohms with a warm engine. Refer to the MANIFOLD AIR/FUEL TEMPERATURE (MAT) SENSOR RESISTANCE VALUES
table below.
MANIFOLD AIR/FUEL TEMPERATURE (MAT) SENSOR RESISTANCE VALUES
| Degrees F° |
Degrees C° |
Resistance (Ohms) |
| -40 |
-40 |
100,700 |
| 0 |
-18 |
25,000 |
| 20 |
-7 |
13,500 |
| 40 |
4 |
7,500 |
| 70 |
20 |
3,400 |
| 100 |
38 |
1,600 |
| 160 |
70 |
450 |
| 212 |
100 |
185 |
- If any resistance is not within the range as specified in the table, replace the MAT sensor.
- Test the resistance of the wire harness between the ECU wire harness connector terminal "D-3" and the sensor connector terminal "C-8".
- Repair as necessary any circuits displaying a value greater than one ohm.