Hyundai: Engine D4FA. Manual — part 50
DIESEL CONTROL SYSTEM
FLA -71
VGT CONTROL SOLENOID VALVE
VGT ACTUATOR
E79C646F
Variable Geometry Turbocharger (VGT) is used to charge
additional air into combustion chamber for improvement of
combustion efficiency.
ECM controls the duty of VGT solenoid valve according to
engine load.
VGT solenoid
LGJF501M
CIRCUIT DIAGRAM
C134
Harness side
C101-2(29)
1
2
After main relay
VGT control
VGT Actuator
ECM
1
2
EGNG116A
SIGNAL WAVEFORM
As the VGT actuator is opened increasingly, the time "T"
becomes shorter.
VGT operating range
T
EFNF561A
COMPONENT INSPECTION
1.
Turn the ignition key off.
2.
Disconnect the VGT actuator.
3.
Measure resistance between the terminals 1 and 2 of
the VGT actuator.
FLA -72
FUEL SYSTEM
<Component side>
2
1
LGJF503F
4.
Refering to " SPECIFICATION", check that the resis-
tance is within specification.
DIESEL CONTROL SYSTEM
FLA -73
FUEL PRESSURE REGULATOR
VALVE
FUEL PRESSURE REGULATOR
(MPROP)
EA7A92BD
The fuel pressure-control vlave sets the correct pressure
in the rail as a function of engine loading, and manitains
it at this level. If the rail pressure is excessive, the pres-
sure-control valve opens and a portion of the fuel returns
from the rail to the fuel tank via a collector line. If the
rail pressure is too low, the pressure-control valve closes
and seals off the high-pressure stage from the low-pres-
sure stages. Fuel pressure control valve is integrated in
high-pressure pump.
AWJF300P
SPECIFICATION
Temperature ℃(℉)
Resistance (Ω )
20(68)
2.9 ~ 3.15
CIRCUIT DIAGRAM
C143
Harness side
C101-1(19)
C101-1(49)
1
2
MPROP "HIGH SIDE"
MPROP
ECM
MPROP "LOW SIDE"
2
1
EGNG117A
SIGNAL WAVEFORM
The cycle time "T" becomes shorter while idling and the fuel
pressure regulator is opening to allow a large amount of fuel
to be returned to the fuel tank.
The cycle time "T" becomes longer when accelerating and the
fuel pressure regulator is closing to allow a small amount of
fuel to be returned to the fuel tank.
T
EFNF557A
FLA -74
FUEL SYSTEM
COMPONENT INSPECTION
1.
Turn the ignition key off.
2.
Disconnect the fuel pressure regulator connector.
3.
Measure resistance between the terminals 1 and 2 of
the fuel pressure regulator connector.
<Component side>
2
1
LGJF501Q
4.
Refering to "SPECIFICATION", check that the resis-
tance is within specification.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст