SOLENOID - FUEL QUANTITY
DESCRIPTION
The fuel quantity solenoid mounts to front of the high pressure pump and is controlled by the ECM. The solenoid assists in maintaining proper fuel quantity in all three of the pumping elements, inside the high pressure pump, under all operating conditions. Fuel tank heat protection is also provided by the fuel quantity solenoid. The solenoid meters the exact amount of fuel to prevent excess heated fuel from returning to the tank.
OPERATION
The ECM monitors the fuel system and measures for pressure vibrations. The ECM will then send a pulse width signal to the fuel quantity solenoid to regulate the amount of fuel to the high pressure pump plunger and barrel assemblies. The valve then adjusts the injection correction quantity for each individual cylinder in line with the firing order, there by eliminating the pressure resonance in the fuel rail and improving each independent injectors operation. The fuel quantity solenoid also interrupts the fuel supply to the high pressure pump plunger and barrel assemblies when the engine is switched off.
The ECM detects the operating state which exists at the engine by means of the sensors. In order to adapt the quantity injected, either the rail pressure can be adjusted by way of the fuel pressure solenoid and the fuel quantity solenoid, or the actuation time of the piezo actuators in the fuel injectors can be extended or shortened.
Fuel quantity control is performed under the following operating conditions:
- Engine temperature above 10°C (50°F)
- Approximately 30 seconds after the engine has started
- Fuel temperature > 20°C (68°F)
- Engine not in deceleration mode
REMOVAL
1. Disconnect the negative battery cable.
2. Disconnect the fuel quantity solenoid wiring harness connector.
3. Remove the solenoid fasteners and remove the solenoid .
INSTALLATION
1. Clean sealing surfaces.
2. Install new seal on sensor.
3. Position the solenoid on to the high pressure pump and install fasteners .
4. Connect wiring harness connector to the solenoid.
5. Connect negative battery cable.
6. Start the engine, allow to run, turn engine off and inspect for leaks (Refer to 14 - FUEL SYSTEM/FUEL INJECTION - WARNING).