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 sensor input voltage is lower than the minimum threshold value during 0.14 sec under normal driving condition, ECM sets DTC P0122.
Item
Detecting Condition
Possible Cause
DTC Strategy
Signal check, low
Poor connection
Open or short to ground in power circuit
Short to ground in signal circuit
TPS
Enable Conditions
IG "ON"
Threshold Value
TPS1 voltage < 0.176
Diagnostic Time
0.14 sec
MIL ON Condition
5 sec
Normal waveform of TPS1 & TPS2 with no accel padal depressed under IG ON condition