Specifications

8
Subsystems
The fuel injection system
The fuel pump, which is located in the fuel tank,
pumps fuel through the fuel filter to the injectors.
The injectors are connected to each other by the
fuel rail. Injection occurs sequentially. Using the
input signals, the control unit calculates the
necessary fuel quantity and the required injec-
tion period.
The quantity of fuel injected is determined solely
by the length of the period during which the
injector is open. The pressure regulator regulates
the injection pressure in the fuel rail and regula-
tes the return flow of excess fuel to the fuel tank.
Input signals for calculating injection periods
● Engine load signal from air mass meter
● Intake air temperature
● Signal from throttle valve control part
● Signal from engine speed sender
● Coolant temperature
● Signal from Lambda probes
● Signal from accelerator pedal module
● Signal from Hall senders
1Fuel tank
2Fuel pump
3Filter
4Fuel rail
5 Fuel pressure regulator
6Injectors
7 Engine control unit
8 Accelerator pedal module
9 Air mass meter with sender
for intake air temperature
10 Engine speed sender
11 Temperature sender (G62)
12 Lambda probes
13 Throttle valve control part
14 Hall senders
1
2
3
4
5
7
8
9
6
6
6
6
10
11
12
13
S249_006
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6
6
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