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P1121 - Electric Throttle Control Actuator

Possible causes
- Faulty Electric Throttle Control Actuator
- Electric Throttle Control Actuator harness is open or shorted
- Electric Throttle Control Actuator circuit poor electrical connection
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- No throttle pedal response
P1121 Description

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 Information for specific makes
P1121 ACURA Throttle Position Lower Than Expected
P1121 AUDI HO2S Sensor Heater Circuit Short To Ground Bank 2 Sensor 2
P1121 BMW Pedal Position 1 Range/Performance Problem
P1121 BUICK Throttle Position Sensor Circuit Intermittent High Voltage
P1121 CADILLAC Throttle Position Sensor Circuit Intermittent High Voltage
P1121 CHEVROLET Throttle Position Sensor Circuit Intermittent High Voltage
P1121 DODGE Decreased Engine Performance Due To High Intake Air Temp
P1121 FORD Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
P1121 GMC Throttle Position Sensor Circuit Intermittent High Voltage
P1121 HONDA Throttle Position Lower Than Expected
P1121 HYUNDAI Throttle Position Input - Abnormal
P1121 INFINITI Electric Throttle Control Actuator
P1121 ISUZU Throttle Position Sensor Circuit Lower Than Expected
P1121 KIA Throttle Position Sensor Signal Invalid
P1121 LEXUS Accelerator Pedal Position Sensor Range/Performance Problem
P1121 LEXUS-2 Coolant Flow Control Valve Position Sensor Circuit Stuck
P1121 LINCOLN Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
P1121 MAZDA Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
P1121 MERCURY Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
P1121 NISSAN Electric Throttle Control Actuator
P1121 PONTIAC Throttle Position Sensor Circuit Intermittent High Voltage
P1121 SATURN Throttle Position Sensor Circuit Intermittent High Voltage
P1121 SUBARU Neutral Position Switch Circuit
P1121 SUZUKI Throttle Position Sensor Intermittent High Voltage
P1121 TOYOTA Accelerator Pedal Position Sensor Range/Performance Problem
P1121 TOYOTA-2 Coolant Flow Control Valve Position Sensor Circuit Stuck
P1121 VOLKSWAGEN HO2S Sensor Heater Circuit Short To Ground Bank 2 Sensor 2
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