Air Control Valve(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 ACV is open less than 6% of target value within 1sec or stuck open over 3sec.
Item
Detecting Condition
Possible Cause
DTC Strategy
Signal monitoring
ACV
Enable Conditions
Engine running
Threshold Value
ACV is open less than 6% of target value for 1sec or stuck open for 3sec.
Diagnostic Time
Refer to threshold value
Fail Safe
Fuel cut
NO
-
EGR Off
YES
Fuel Limit
Check Lamp
ON
Air Control Valve
(ACV)fully opened
Air Control Valve(ACV)fully closed
Air Control Valve(ACV)
operating Hz
5%
95%
250±7.5 Hz