SENSOR-FUEL PRESSURE
DESCRIPTION
The fuel rail pressure sensor monitors and passes on the current fuel rail pressure to the ECM. The non-constant system pressure influences the position of the sensor diaphragm which alters the sensors electrical resistance.
WARNING: A residual pressure of about 50 to 80 bar (725 to 1160 PSI) remains in the fuel rails after switching off the engine. The high-pressure system must only be opened after the fuel pressure drops to a safe level.
OPERATION
The fuel rail pressure sensor measures the current fuel rail pressure and supplies an appropriate voltage signal to the Engine Control Module (ECM). A fuel pressure solenoid is then actuated by the ECM through a control loop until the desired rail pressure is reached.
REMOVAL
WARNING: (Refer To 14 - Fuel System - Warning). No sparks, open flames or smoking. Risk of poisoning from inhaling and swallowing fuel. Risk of injury to eyes and skin from contact with fuel. Pour fuels only into suitable and appropriately marked containers. Wear protective clothing.
NOTE: To avoid leakage problems, the rail pressure sensor should not be removed unless it is to be replaced.
1. Disconnect negative battery cable.
2. Remove engine cover.
3. Unplug electrical connector at fuel rail pressure sensor.
4. Remove the right fuel rail.
5. Position the fuel rail in a soft jawed vise.
6. Remove rail pressure sensor.
INSTALLATION
WARNING: (Refer to 14 - FUEL SYSTEM - WARNING) . No sparks, open flames or smoking. Risk of poisoning from inhaling and swallowing fuel. Risk of injury to eyes and skin from contact with fuel. Pour fuels only into suitable and appropriately marked containers. Wear protective clothing.
NOTE: The installation of the pressure sensor must be performed out of vehicle so that the sensor can be tightened properly.
1. Install the fuel rail pressure sensor and new seal. Tighten to 22 N·m (194 lbs. in.).
2. Install the fuel rail.
3. Connect rail sensor electrical connector.
4. Connect negative battery cable.
5. Start engine, allow to warm, turn engine off and inspect for leaks.
6. Install engine cover.