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℃)
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