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Symptom List: P0171-1/1 FUEL SYSTEM LEAN Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0171-1/1 FUEL SYSTEM LEAN. When Monitored and Set Condition: P0171-1/1 FUEL SYSTEM LEAN When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above 20 deg. F and altitude below 8000 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 P0174-2/1 FUEL SYSTEM LEAN When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above 20 deg. F and altitude below 8000 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 INTERMITTENT CONDITION RESTRICTED FUEL SUPPLY LINE FUEL PUMP INLET STRAINER PLUGGED FUEL PUMP MODULE O2 SENSOR O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND O2 SENSOR HEATER OPERATION TPS VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE CLOSED THROTTLE POSITION SENSOR SWEEP MAP SENSOR OPERATION ECT SENSOR OPERATION ENGINE MECHANICAL PROBLEM FUEL FILTER/PRESSURE REGULATOR (HIGH) PCM 113 DRIVEABILITY - GAS |