DTC P0171 System Too Lean (Bank 1); DTC P0174 System Too Lean (Bank 2): DTC Detecting Condition

DTC DETECTING CONDITION

Item	Detecting Condition	Possible cause
DTC Strategy	Fuel Trim Limits Exceeded	Poor Connection Relevant sensor/actuator Air leakage PCM
Enable Conditions	550 RPM ≤ Engine speed ≤ 4000 RPM 60°C (140°F) ≤ Engine coolant temperature ≤ 115°C (239°F) -10°C (14°F) ≤ Intake air temperature ≤ 60°C (140°F) 0° ≤ Throttle position ≤ 80° 25kPa ≤ Engine load ≤ 90kPa 1.5g/s ≤ Intake air flow ≤ 80g/s Barometric pressure ≥ 72kPa Vehicle speed ≤ 130km/h System voltage ≥ 11V Feedback control state No other diagnostic fault
Threshold value	Average of short term fuel trim > 1.2 Average of long term fuel trim > 0.8
Diagnosis Time	Continuous (More than 0.3 second failure for every 0.75 second test)
MIL On Condition	2 Driving Cycles