DTC P0121 sets when the ECM 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. ECM 4. Obstruction in the throttle plate movement 5. Throttle body |
Enable Conditions |
•
Engine Speed > 320 rpm | ||
Threshold Value |
•
| TPS1 position - TPS2 position | > 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 > 320 rpm | ||
Threshold Value |
•
I TPS1 position - Model TPS l (if TPS2 error) > 9% | ||
Diagnostic Time |
•
0.2 sec. | ||
MIL ON Condition |
•
1 Driving cycle | ||
