- Electric throttle control actuator harness is open or shorted
- Electric throttle control actuator circuit is open or shorted
- Faulty electric throttle control actuator

Electric throttle control actuator does not function properly due to the return spring malfunction or throttle valve is stuck open

- Engine Light ON (or Service Engine Soon Warning Light)
- No throttle pedal response

Electric Throttle Control Actuator consists of throttle control motor, Throttle Position Sensor (TPS), etc. The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.


The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throttle valve and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

P1121 ACURA
P1121 BUICK
P1121 CADILLAC
P1121 CHEVROLET
P1121 DODGE
P1121 FORD
P1121 GMC
P1121 HONDA
P1121 HYUNDAI
P1121 LEXUS
P1121 TOYOTA
P1121 INFINITI
P1121 NISSAN
P1121 BMW
P1121 ISUZU
P1121 TOYOTA PRIUS
P1121 KIA
P1121 SUBARU