Mat Sensor Test
- Disconnect wire harness connector from MAT sensor. Test resistance of sensor with a high impedance digital ohmmeter. Resistance should be less than 1000 ohms with engine warm. Replace sensor if resistance is not within specified range. See TEMPERATURE-TO-RESISTANCE VALUES table.
- Test resistance of wire harness between ECU wire harness connector terminal D-3 and sensor connector terminal. Repeat test with terminal C-8 at ECU and sensor connector terminal. Repair wire harness if an open circuit or resistance is greater than one ohm is indicated.
TEMPERATURE-TO-RESISTANCE VALUES (CTS & MAT SENSOR)
| °F | °C (Approximate) | Ohms |
|---|---|---|
| 212 | 100 | 185 |
| 160 | 70 | 450 |
| 100 | 38 | 1600 |
| 70 | 20 | 3400 |
| 40 | 4 | 7500 |
| 20 | -7 | 13,500 |
| 0 | -18 | 25,000 |
| -40 | -40 | 100,700 |