SENSOR-FUEL TEMPERATURE
DESCRIPTION
The fuel temperature sensor is integrated in the high pressure fuel pump next to the fuel quantity valve. The sensor detects the temperature of the fuel and supplies that information to the ECM. The sensor ranges from - 40°F (- 40C) 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.
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 controller quantity of the pressure regulating valve is reduced and the fuel temperature is lowered.
REMOVAL
NOTE: Capture and properly store all fluid seepage in appropriately marked containers.
1. Disconnect the negative battery cable.
2. Disconnect the fuel quantity solenoid wiring harness connector.
3. Disconnect the temperature sensor wiring harness connector.
4. Remove the fuel temperature sensor from the high pressure pump .
INSTALLATION
1. Clean sealing surfaces.
2. Install new seal on sensor.
3. Screw the sensor into the high pressure pump and tighten to 25 N·m (18 lbs.ft.) .
4. Connect the temperature sensor wiring harness connector.
5. Connect the fuel quantity solenoid wiring harness connector.
6. Connect negative battery cable.
7. Start engine, allow to warm, shut engine off and inspect for leaks (Refer to 14 - FUEL SYSTEM/FUEL INJECTION - WARNING).