As closing or opening vacuum line from vacuum pump which is installed at the end of cam shaft, with the method of duty control, Throttle contor Actuator controls throttle flap valve when engine is turning OFF.
When turning engines OFF, Throttle flap valve cuts intake air to prevent overrun phenomena.(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. )
To check its operation, watch if it operate when turning engine OFF.
P2112 is set when "0"A in throttle contor actuator is detected for more than 0.11 sec. this code is due to 1)open or short to ground in control circuit or 2)internal open in actuator component.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Voltage monitoring
? Throttle control actuator circuit
? Throttle control actuator component
Enable Conditions
? IG KEY "ON"
Threshold Value
? Short to GND, Wiring open
Diagnostic Time
? 110ms
Fail Safe
Fuel Cut
NO
EGR Off
YES
Fuel Limit
Check Lamp
Throttle control actuator component resistance
Throttle control actuator operating Hz
Throttle control actuator operating duty
23.8~31.3O (20?)
300Hz
38%(no vacuum)~90%(vacuum)