Typical Malfunction Thresholds
WARNING: This page is about a different car, the 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
ECT SENSOR COLD START MONITOR
| ECT sensor value change |
Less than 5°C (9°F) |
ECT SENSOR SOAK MONITOR
| Difference between current ECT sensor value and pervious ECT sensor value when engine stopped |
Less than 5°C (9°F) |