Hyundai: Engine D4FA. Manual - part 52

DIESEL CONTROL SYSTEM

FLA -79

THROTTLE CONTROL ACTUATOR

THROTTLE FLAP ACTUATOR

E599B5CE

At the moment ignition switch turns off, throttle flap closing
movement prevents engine stalling.

Throttle Flap Actuator

EFNF107A

SPECIFICATION

Temperature ℃(℉)

Resistance (Ω )

20 (68)

28.3 ~ 31.1

CIRCUIT DIAGRAM

C135

Harness side

C101-2(90)

1

2

After main relay

Throttle flap control

Throttle flap actuator

ECM

1

2

EGNG120A

FLA -80

FUEL SYSTEM

SIGNAL WAVEFORM

Fig.1) Waveform of throttle flap actuator without throttle flap operation : 38% duty is always outputted at ignition switch "ON" and with 
          engine running.
Fig.2) Waveform of throttle flap actuator without throttle flap operation : 90% duty is outputted for about 1 sec. at ignition switch 
          "OFF".

Fig.1

Fig.2

LGJF501Y

COMPONENT INSPECTION

1.

Turn the ignition key off.

2.

Disconnect the throttle flap actuator solenoid valve
connector.

3.

Measure resistance between the terminals 1 and 2 of
throttle flap actuator solenoid valve connecotr.

2

1

Ω

<Component side>

LGJF502B

4.

Refering to "SPECIFICATION", check that the resis-
tance is within specification.

DIESEL CONTROL SYSTEM

FLA -81

VARIABLE SWIRL CONTROL
ACTUATOR

VARIABLE SWIRL ACTUATOR

EA6E58C8

Variable swirl actuator consists of DC motor and valve po-
sition sensor which detects the position of swirl valve.
At idle and below 3000rpm, swirl valve is closed to take
swirl effect. This swirl effect increases air flow rate.

AWJF300W

OPERATION PRINCIPLE

Item

Low and Middle Load

High Load

Engine speed

below 3000rpm

above 3000rpm

Valve operation

close

open

Description

illustration

AWJF302A

AWJF302B

Fail-safe

Variable Swirl Valve is opened fully

※ To prevent swirl valve and shaft from being stuck by
foreign material and to learn max opening and closing po-
sition of swirl valve, it is always fully opened and closed
twice at engine stop.

SPECIFICATION

Item

Temperature℃(℉)

Resistance(Ω )

Motor

20 (68)

3.2 ~ 4.4

Position sensor

20 (68)

3.44 ~ 5.16

FLA -82

FUEL SYSTEM

CIRCUIT DIAGRAM

C147

Harness side

C101-1(60)

Position sensor ground

Position sensor signal

Position sensor supply

Motor (+)

Motor

Variable swirl actuator

ECM

5

1

2

3

4

5

M

C101-1(56)

C101-1(26)

C101-1(60)

C101-1(30)

4

3

1

2

EGNG121A

SIGNAL WAVEFORM

Fig.1

Fig.2

Fig.1) Swirl valve closed (Idle)
Fig.2) Swirl valve opened (Above 3000rpm)

Motor

(+)

Motor

(+)

Motor

(-)

Motor

(-)

LGJF502D

COMPONENT INSPECTION

1.

Turn ignition switch OFF.

2.

Disconnect Variable swirl actuator connector.

3.

Check that swirl valve is stuck by foreign material.

4.

Supply the terminal 1 of variable swirl actuator con-
nector (component side) with 12V and ground the ter-
minal 2 of it.

5.

Check swirl valve operation.

5

4

3

2

1

12V

LGJF502E

6.

Measure resistance between the terminals 1 and 2 of
variable swirl actuator connector (component side).

Resistence : 3.2 ~ 4.4Ω (20℃)