Hyundai: Engine D4FA. Manual — part 51
DIESEL CONTROL SYSTEM
FLA -75
RAIL PRESSURE REGULATOR
VALVE
RAIL PRESSURE CONTROL VAVLE
E52FBD72
Rail pressure control valve(PCV) is installed in common
rail.
If controls common rail pressure fast as regulating return-
ing quantity if fuel which is delivered to common rail when
fast rise of rail pressure is required like the moment of turn-
ing engine ON or when fast relief of pressure is required
like at the point of receleration.
AWJF300V
SPECIFICATION
Temperature ℃(℉)
Resistance (Ω )
20(68)
3.42 ~ 3.78
CIRCUIT DIAGRAM
C144
Harness side
C101-1(4)
C101-1(34)
1
2
Rail pressure control valve(High)
PCV
ECM
Rail pressure control valve(Low)
2
1
EGNG118A
FLA -76
FUEL SYSTEM
SIGNAL WAVEFORM
Fig.1) Waveform of rail pressure control valve at idle (20% duty)
Fig.2) Waveform of rail pressure control valve as accelerating (50% duty)
Fig.1
Fig.2
LGJF501S
COMPONENT INSPECTION
1.
Turn the ignition key off.
2.
Disconnect the rail pressure control valve connector.
3.
Measure resistance between the terminals 1 and 2 of
the rail pressure control valve connector.
<Component side>
2
1
LGJF501Q
4.
Refering to "SPECIFICATION", check that the resis-
tance is within specification.
DIESEL CONTROL SYSTEM
FLA -77
EGR SOLENOID VALVE
EGR CONTROL VALVE
EBCC2CAA
The EGR(Exhaust Gas Recirculation) system is used to
add the exhaust gas to intake air in order to reduce an ex-
cess of air and the temperature in the combustion cham-
ber.
The EGR valve is directly controlled by ECM’s control sig-
nal directly not by vacuum.
ECM controls the EGR valve with duty.
The duty control of the solenoid valve is determind by ECM
depending on engine load and the need of intake air.
EGR solenoid
LGJF501T
SPECIFICATION
Temperature℃(℉)
Resistance(Ω )
19 ~ 25 (66.2 ~ 77)
7.3 ~ 8.3
CIRCUIT DIAGRAM
C137
Harness side
C101-1(59)
1
2
After main relay
EGR control
EGR vavle
ECM
1
2
EGNG119A
FLA -78
FUEL SYSTEM
SIGNAL WAVEFORM
Fig.1) 9.4% duty signal waveform of EGR actuator (EGR valve closed)
Fig.2) 39% duty signal waveform of EGR actuator (EGR valve opened)
Fig.2
Fig.1
LGJF501U
COMPONENT INSPECTION
1.
Turn the ignition key off.
2.
Disconnect the EGR valve connector.
3.
Measure resistance between the terminals 1 and 2 of
the EGR valve connector.
<Component side>
2
1
LGJF501W
4.
Refering to "SPECIFICATION", check that the resis-
tance is within specification.
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