SHOP MANUAL
Ch 6 page 74
ELECTRICAL SYSTEM
Fuel inlet metering valve
Solenoid valve for XPI injector
The solenoid valve is part of the injector. The solenoid valve con-
trols the fuel injection. When the solenoid valve is not powered,
the injector is closed. When the solenoid valve is supplied with
power, fuel is injected into the cylinder. The opening time of the
solenoid valve is controlled by the engine control unit.
The amount of fuel injected into the cylinder is determined by the
opening time and the pressure in the accumulator.
The number of injections in each compression stroke can vary.
This leads to more efficient combustion, lower exhaust emissions
and quieter engine operation.
The fuel inlet metering valve controls how much fuel is brought into the high pressure pump.
The fuel inlet metering valve is located on the high pressure pump. The fuel metering valve controls the fuel
flow to the high pressure pump and is controlled by a PWM signal from the engine control unit.
The engine control unit uses the signal from the fuel pressure sensor on the accumulator to calculate how
much fuel should be supplied to the high pressure pump and then controls the fuel metering valve so that it
releases the required quantity of fuel.
If power to the fuel metering valve is cut, it will become fully open and a fault code will be generated at the
same time.
Resistance values
Temperature °C Resistance ± 0.5 ohms
-20 1.8
0 2.0
20 2.2
40 2.3
60 2.5
80 2.7
Figure 62
Figure 61
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