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.