DTC P0121 sets when the ECM/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 |
DTC Strategy |
•
Plausibility 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 during engine start (engine operating state out of start) > 640...960rpm depending on start ECT
•
No TPS adaptation request | |
Threshold Value |
•
ABS(TPS_2 - TPS_1) > 7.6% Failed TPS signal is determined by the difference between measured mass air flow and calculated mass air flow based on each TPS signal and engine speed | |
Diagnostic Time |
•
0.3 sec | |
MIL ON Condition |
•
1 Driving cycles. |
