Coolant Temperature Sensor (CTS) & MAT Sensor
- Disconnect the electrical connector from the sensor. Using a high impedance, digital volt/ohmmeter, measure sensor resistance. If sensor resistance is not as specified, replace sensor. Refer to the CTS & MAT SENSOR TEMPERATURE-TO-RESISTANCE VALUE table.
- Test electrical harness resistance of both sensors by testing between ECU harness connector "D-3" and sensor connector. Also test between sensor connector and ECU harness connector "C-10" ("C-8" on MAT sensor). Repair wire if open circuit is detected. Repair MAT sensor wiring harness if resistance is greater than one ohm.
CTS & MAT SENSOR TEMPERATURE-TO-RESISTANCE VALUE
| °F(°C) | Ohms |
|---|---|
| 212 (100) | 185 |
| 160 (71) | 450 |
| 100 (38) | 1600 |
| 70 (21) | 3400 |
| 40 (4) | 7500 |
| 20 (-7) | 13,500 |
| 0 (-18) | 25,000 |
| -40 (-40) | 100,700 |