Hyundai Santa Fe (2006 year). Manual - part 367
FL -78
FUEL SYSTEM
THROTTLE CONTROL ACTUATOR
INSPECTION
EE647E4E
FUNCTION AND OPERATION PRINCIPLE
The Throttle Control Actuator is mounted on throttle body
of diesel engine and controls throttle valve according to
PWM (Pulse With Modulation) signal from ECM.
It consists of;
-
a DC motor which actuates the throttle valve,
-
a 2-step gear (transmission ratio = 1:40) which is lo-
cated in between the DC motor and the throttle valve
and increases torque of the DC motor,
-
a position sensor which is a hall-effect sensor and
detects status of the throttle valve,
-
an electric control unit which is a micro-controller and
drives the DC motor by the PWM (Pulse With Modu-
lation) signal from the ECM,
-
and a reset spring which resets the de-energized
throttle valve to its open position.
Its function is described below:
1.
Anti-judder function: When engine is shut off, the
ECM can prevent intake air from entering to intake
manifold by fully closing the throttle valve for 1.5 sec-
onds (95% < Duty < 97%) to reduce engine vibration.
2.
Intake air control for EGR: When exhaust gas pres-
sure is equal to or lower than intake air pressure (for
example, when low engine speed), the exhaust gas
would not enter to the intake manifold. At this time,
the ECM partially closes the throttle valve (5% < Duty
< 94%) to reduce the intake air quantity. The intake
air pressure thus is lower than the exhaust gas pres-
sure.
3.
Exhaust gas temperature control for CPF regenera-
tion (Vehicle equipped with CPF System) : When the
Catalyzed Particulate Filter (CPF) is need to regener-
ate, the ECM partially closes the throttle valve (5% <
Duty < 94%) to reduce the intake air quantity. At this
time, the air-fuel ratio would become rich and the ex-
haust gas temperature would be high enough to burn
the soot inside the CPF.
Throttle Control Actuator
EFQG021A
SPECIFICATION
Duty (%)
Throttle Valve Position
5
Open
5 ~ 94
Normal operation (Partially open in
proportion to duty value)
94
Closed
94 ~ 95
Maintaining the last valid position
95 ~ 97
Fully closed