Typical Malfunction Thresholds
WARNING: This page is about a different car, the 2025 Lexus RX 450h+, 2025 Lexus RX 350h, 2024 Lexus RX 450h+, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.
JUDGMENT BY SIMULATED ENGINE COOLANT TEMPERATURE
| Duration that both of the following conditions are met | 5 seconds or more |
| (a) Estimated engine coolant temperature | 75°C (167°F) or higher |
| (b) Engine coolant temperature sensor output | Less than 75°C (167°F) |
JUDGMENT BY ENGINE COOLANT TEMPERATURE AND NO. 2 ENGINE COOLANT TEMPERATURE CHANGES
| Engine coolant temperature change speed | Less than -0.4°C/sec (31°F/sec), or higher than 0.15°C/sec (32.27°F/sec) |
| Engine coolant temperature | Less than 75°C (167°F) |
| Grade of engine coolant temperature - No. 2 engine coolant temperature | Higher than -0.1°C/sec (-0.18°F/sec), and less than 0.1°C/sec (0.18°F/sec) |
| Absolute engine coolant temperature - No. 2 engine coolant temperature | Less than 6.6°C (11.8°F) |