CHT Sensor

The CHT sensor:

^ is mounted into the wall of the cylinder head and is not connected to any coolant passages.
^ sends a signal to the PCM indicating the cylinder head temperature.

^ If the temperature exceeds 126°C (258°F), the PCM disables four fuel injectors at a time. The PCM will alternate which four injectors are disabled every 32 engine cycles. The four cylinders that are not being fuel injected act as air pumps to aid in cooling the engine.
^ If the temperature exceeds 154 °C (310°F), the PCM disables all of the fuel injectors until the engine temperature drops below 154°C (310°F).