Diagnostic Aids
Ensure thermostat is operating properly. Check for faulty connections or damaged harness. If connections and harness appear okay, observe scan tool while moving all related harness and connectors. A change in scan tool display indicates fault location.
Check for skewed ECT sensor. See ECT TEMPERATURE-TO-RESISTANCE VALUES table.
ECT TEMPERATURE-TO-RESISTANCE VALUES
| Temperature °F (°C) | Ohms |
|---|---|
| 212 (100) | 177 |
| 194 (90) | 241 |
| 158 (70) | 467 |
| 122 (50) | 973 |
| 104 (40) | 1459 |
| 86 (30) | 2238 |
| 68 (20) | 3520 |
| 50 (10) | 5670 |