1. ETC Motor & TPS
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. TPS is a variable resistance and its value is cahnged by open angle of throttle valve.
If the deviation between the throttle position by TPS2 signal and the throttle position by ECM's model value is bigger than the threshold value under TPS1 error, ECM sets DTC P0221.
Item
Detecting Condition
Possible Cause
DTC Strategy
Plausibility check between
Poor connection
TPS
ECM
Enable Conditions
IG "ON"
Threshold Value
I TPS1 Position – TPS2 Position I > 9%
Diagnostic Time
0.28sec
MIL ON Condition
5 sec
Fig.1) Normal waveform of TPS1 & TPS2 with no accel padal depressed under IG ON condition