RAM 2500 Truck 4WD L6-5.9L DSL Turbo VIN 6 (1999)
Fuel Temperature Sensor: Description and Operation
Two different fuel temperature sensors are used. One of the sensors is located inside of the Bosch VP44 fuel injection pump and is a non-serviceable
part. It is used to check fuel temperature within the injection pump and to set a Diagnostic Trouble Code (DTC) if a specific high fuel temperature has
been reached. If high temperature has been reached, engine power will be de-rated by the Engine Control Module (ECM).
The other fuel temperature sensor is located in the top of the fuel filter housing and is serviceable (serviceable if replacing the fuel heater). It is used to
control the fuel heater element. Refer to Fuel Heater Description and Operation for additional information.
