General information Hyundai Trouble Code

General Description of Hyundai Sonata.

P0221 Electronic Throttle Control.

The Electronic Throttle Control(ETC) system is made of the components throttle body, throttle position sensor (TPS) 1 & 2 and Acceleration Position Sensor (APS) 1&2. TPS 1&2 sharing the same source voltage and ground. The throttle valve opening is control by throttle motor which is controlled by Engine Control Module(PCM). The opposite position indicator shows inverted signal characteristics. TPS 1 output voltage increases smoothly in proportion with the throttle valve opening angle after starting.TPS2 output voltage decreases in inverse proportion with the throttle valve opening angle after starting. TPS provides feedback to the PCM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.

DTC Checking Condition:

DTC Strategy:

• Plausibility check between TPS1 and TPS2.

Enable Condition:

• No engine stop and engine start.
• No TPS adaptation request.
• No relevant failure.

 Threshold Value:

• An absolute value of TPS1 - TPS2 > 7.6%.