Throttle Control actuator(ACV) helps EEGR actuator in EGR control as controlling throttle flap position with the method of duty control. In EURO 3 diesel engine, precise EGR control is more difficult than in EURO 4 engine. Even though EGR actuator opens exhaust gas outlet fully, it is difficult for exhaust gas to be inhaled at intake manifold because intake air is already exist to be inhaled at there in EURO 3 engine. However in EURO 4 engine, controlling throttle flap position, it is possible to regulate the differential pressure between exhaust and intake air. With the control of the differential pressure, the amount of exhaust air to be recirculated is regulated. Besides, When turning engines OFF, Throttle control actuator cuts intake air to prevent dieselling.(In spite of turning engine OFF, engine does not stop and runs for a while due to rotating inertia of engine and fuel leakage at injector nozzle. )
P2111 is set When over current monitored at Throttle Actuator control circuit for 1second. It can be caused by short to Battery of Throttle Actuator circuit or internal short of Throttle Actuator
Item
Detecting Condition
Possible Cause
DTC Strategy
Current monitoring
Throttle Actuator circuit (ACV)
Throttle Actuator (ACV)
ECU
Enable Conditions
IG KEY "ON"
Threshold Value
Short to Battery
Diagnostic Time
1000ms
Fail Safe
Fuel Cut
NO
EGR Off
Fuel Limit
Check Lamp
YES
RESISTANCE
FREQUENCE
OPERATING VOLTAGE
APPROX. 4.3O (20?)
400 ~ 16000 Hz
12V
OPERATING STANDARD RANGE
OPERATING TEMPERATURE
82°
-40 ~ 140 ?
5V
Fig.1) Waveform of Throttle Actuator(ACV) at IDLE - Not Operation status.
Fig.2) Wavrform of Throttle Actuator(ACV) after Engine "OFF".