Checking the fuel trime value under detecting condition, if its average exceeds the limit over certain period, PCM/ECM sets P0172. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Monitor the fuel trim value | 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% | |
Diagnostic Time |
•
90 sec | |
Mil On Condition |
•
2 Drive Cycles |
