Navigator 4WD V8-5.4L VIN 5 (2006)
Engine Temperature Sensor: Description and Operation
CHT Sensor
The CHT sensor:
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is mounted into the wall of the cylinder head and is not connected to any coolant passages.
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sends the PCM a signal indicating cylinder head temperature.
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if the temperature exceeds approximately 121 °C (250°F), the PCM disables half of the fuel injectors at a time. The PCM will alternate which
fuel injectors are disabled every 32 engine cycles. The cylinders that are not being fuel injected act as air pumps to aid in engine cooling.
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if the temperature exceeds approximately 166°C (330°F), the PCM disables all of the fuel injectors until the engine temperature drops below
approximately 1 54°C (31 0°F).
