If the difference between real and target throttle position is abnormal, the ECM/PCM sets DTC P0638.
Item | Detecting Condition | Possible Cause | |
DTC Strategy | Case1 |
•
TPS adaptation condition check | 1. Throttle stuck 2. Open in motor circuit 3. Faulty motor 4. Faulty ECM/PCM |
Case2 |
•
ETC Limp Home position check | ||
Case3 |
•
Lower mechanical stop adaptation voltage range check | ||
Enable Conditions | Case1 |
•
- | |
Case2 |
•
During TPS adaptation | ||
Case3 |
•
During TPS adaptation | ||
Threshold Value | Case1 |
•
- | |
Case2 |
•
Difference between Throttle sensor voltage in limphome and limphome setpoint > 0.332V | ||
Case3 |
•
Difference between Throttle sensor voltage in lower mechanical stop position and lower mechanical stop position setpoint > 0.332 | ||
Diagnostic Time |
•
1.2 sec | ||
MIL ON Condition |
•
1 driving cycles | ||
