Checking the fuel trime value under detecting condition, if its average exceeds the limit over certain period, PCM sets P0172. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Monitoring deviation of short term fuel trim control | 1. Blocking of intake system 2. Fuel leakage in injector 3. Improper fuel pressure |
Enable Conditions |
•
Lambda control active
•
Engine coolant temperature ＞ 163F | |
Threshold value |
•
Short term trim value at MIN Limit for more thin 40sec of total monitoring time
•
short term trim ＞ -30% | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
2 Driving Cycles |
