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Symptom: P0171-FUEL SYSTEM 1/1 LEAN When Monitored and Set Condition: P0171-FUEL SYSTEM 1/1 LEAN When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above 20°F(-7C) and altitude below 8500 ft. Set Condition: If the PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates POSSIBLE CAUSES GOOD TRIP EQUAL TO ZERO RESTRICTED FUEL SUPPLY LINE FUEL PUMP INLET STRAINER PLUGGED FUEL PUMP MODULE O2 SENSOR O2 SIGNAL CIRCUIT O2 RETURN CIRCUIT O2 SENSOR HEATER OPERATION THROTTLE POSITION SENSOR SWEEP MAP SENSOR OPERATION ECT SENSOR OPERATION ENGINE MECHANICAL PROBLEM FUEL CONTAMINATION/EXHAUST LEAK TEST ACTION APPLICABILITY 1 NOTE: Check for contaminates that may have damaged the O2 Sensor: t, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. 303 DRIVEABILITY - NGC |