Navigator 4WD V8-5.4L SOHC VIN L (1998)
From the Powertrain Control/Emissions Diagnosis OBDII Manual:
On applications that do not use a ECT sensor, the CHT sensor is used to determine the engine coolant temperature in place of the ECT sensor. In this
case the PCM may store both CHT and ECT Diagnostic Trouble Codes (DTCs). To cover the entire temperature range of both the CHT and ECT
sensors, the PCM has a dual switching resistor circuit on the CHT input.
For Cylinder Head Temperature (CHT) Sensor refer to: "Powertrain Management : Computers and Control Systems : Engine Temperature
Sensor" See: Engine, Cooling and Exhaust/Cooling System/Engine - Coolant Temperature Sensor/Switch/Engine Temperature Sensor
