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DI07-6
FUEL SYSTEM
FUEL INJECTION SYSTEM
Electronic Control of Fuel System
High pressure pump
IMV valve
Low and high
pressure pump
Fuel temperature
sensor
Water separator
Fuel filter
Water detection
sensor
System composition
- High pressure fuel pump
- Fuel injector
According to input signals from various sensors, engine ECU calculates driver's demand (position of the accelerator
pedal) and then controls overall operating performance of engine and vehicle on that time.
ECU receives signals from sensors via data line and then performs effective engine air-fuel ratio controls based on those
signals. Engine speed is measured by crankshaft speed (position) sensor and camshaft speed (position) sensor deter-
mines injection order and ECU detects driver's pedal position (driver's demand) through electrical signal that is gener-
ated by variable resistance changes in accelerator pedal sensor. Air flow (hot film) sensor detects intake air volume and
sends the signals to ECU. Especially, the engine ECU controls the air-fuel ratio by recognizing instant air volume
changes from air flow sensor to decrease the emissions (EGR valve control). Furthermore, ECU uses signals from
coolant temperature sensor and air temperature sensor, booster pressure sensor and atmospheric pressure sensor as
compensation signal to respond to injection starting, pilot injection set values, various operations and variables.
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Priming
pump
Fuel tank
ECU
- Fuel rail
- Electronic control unit (ECU)
Injectors
Sensors
HFM sensor
Cam position sensor
Crankshaft position sensor
Knock sensor, etc.
- Fuel pressure sensor
- Other sensors and actuators
Fuel pressure sensor
Common rail
Injection
pipe
Supply line
Return line
ECU connecting line
Y220_07007
FUEL SYSTEM
DI ENG SM - 2004.4
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