Component Location
General Description

The Electronic Throttle Control(ETC) system which is composed of throttle body, Throttle Position Sensor(TPS)1&2 and Accelerator Position Sensor(APS) 1&2 controls the mass of airflow by driver's intention. The throttle valve opening is control by throttle motor which is controlled by ECM/PCM. TPS is a variable resistance and its value is cahnged by open angle of throttle valve.

DTC Description

If the deviation between the throttle position by TPS2 signal and the throttle position by ECM/PCM's model value is bigger than the threshold value under TPS1 error, ECM/PCM sets DTC P0221.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

•

Plausibility check between

1.

Poor connection

2.

TPS

3.

ECM/PCM

Enable Conditions

•

IG "ON"

Threshold Value

•

I TPS1 Position – TPS2 Position I > 9%

Diagnostic Time

•

0.28sec

MIL ON Condition

•

1 driving cycle

Diagnostic Circuit Diagram
Signal Waveform & Data

Fig 1) Normal waveform of TPS1 & TPS2 with no accel padal depressed under IG ON condition

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