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.
If the sensor input voltage is lower than the minimum threshold value during 0.14 sec under normal driving condition, ECM/PCM sets DTC P0122.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal check, low | 1. Poor connection 2. Open or short to ground in power circuit 3. Short to ground in signal circuit 4. TPS |
Enable Conditions |
•
IG "ON" | |
Threshold Value |
•
TPS1 voltage < 0.195 | |
Diagnostic Time |
•
0.14 sec | |
MIL ON Condition |
•
1 driving cycle |
Fig 1) Normal waveform of TPS1 & TPS2 with no accel padal depressed under IG ON condition
