Input/Output Signal Chart
| Sensor | Input signal to ECM | ECM function | Actuator | ||
|---|---|---|---|---|---|
| Crankshaft position sensor (POS) | Engine speed(1) | Fuel rail pressure control | High pressure fuel pump | ||
| Exhaust valve timing control position sensor | Camshaft position | ||||
| Fuel rail pressure sensor | Fuel rail pressure | ||||
| Engine coolant temperature sensor | Engine coolant temperature | ||||
| Throttle position sensor | Throttle position | ||||
| Accelerator pedal position sensor | Accelerator pedal position | ||||
| Battery | Battery voltage(1) | ||||
|
|||||
System Description
Low fuel pressure control
- The low fuel pressure pump is controlled by ECM. The pumped fuel passes through the fuel filter and is sent to the high pressure fuel pump.
- Low fuel pressure is adjusted by the fuel pressure regulator.
High fuel pressure control
The high pressure fuel pump raises the pressure of the fuel sent from the low pressure fuel pump. Actuated by the exhaust camshaft, the high pressure fuel pump activates the high pressure fuel pump solenoid based on a signal received from ECM, and adjusts the amount of discharge by changing the timing of closing the inlet check valve to control fuel rail pressure.