FUEL TEMPERATURE SENSOR
DESCRIPTION
The fuel temperature sensor is integrated into the fuel filter housing, along side of the fuel heater. The sensor
detects the temperature of the fuel and supplies that information to the ECM. The sensor ranges from - 40°F (-
40°C) to 284°F (140°C). If the engine is cold, the actual value sent will read ambient temperature. The value rises
after the engine has been started. The fuel temperature sensor IS NOT SERVICED separate from the housing
assembly.
OPERATION
An negative temperature coefficient (NTC) resistor integrated in the fuel temperature sensor alters it’s electrical
resistance in line with the fuel temperature (the resistance drops as the temperature rises). The ECM uses this
reading to calculate optimum engine performance under all driving conditions. If the fuel is to warm, the rail pressure
in the system is lowered. The controlled quantity of the fuel rail pressure solenoid is reduced and the fuel temper-
ature is lowered.
REMOVAL
WARNING: Store fuel in approved and properly marked containers. Wear safety goggles and adequate pro-
tective clothing when servicing fuel system.
1. The fuel temperature sensor is serviced as an assembly along with the fuel heater (Refer to 14 - FUEL SYSTEM/
FUEL DELIVERY/FUEL HEATER - REMOVAL).
14 - 116
FUEL INJECTION - 2.8L DIESEL
KJ