DTC P0121 sets when the PCM indicates the electronic throttle control throttle position sensor 1 circuit is out of range in either the closed or wide open throttle (WOT) modes.
Item | Detecting Condition | Possible Cause | |
Case 1 | DTC Strategy |
•
Rationality check between TPS1 and TPS2. | 1. Poor connection 2. TPS 3. PCM 4. Obstruction in the throttle plate movement 5. Throttle body 6. APS |
Enable Conditions |
•
Engine Speed greater than 320 rpm. | ||
Threshold Value |
•
Absolute value of difference of TPS1 position and TPS2 position greater than 6.3 %~12.2 %. | ||
Diagnostic Time |
•
0.14 sec. | ||
Case 2 | DTC Strategy |
•
If different, check between TPS1 and Model TPS. | |
Enable Conditions |
•
Engine Speed greater than 320 rpm. | ||
Threshold Value |
•
Absolute value of difference of TPS1 position and Model TPS l (if TPS2 error) greater than 9%. | ||
Diagnostic Time |
•
0.2 sec. | ||
MIL ON Condition |
•
1 Driving cycle. | ||
