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Symptom: P0172-FUEL SYSTEM 1/1 RICH When Monitored and Set Condition: P0172-FUEL SYSTEM 1/1 RICH When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above (-7°C)20°F and altitude below 8500 ft. Set Condition: If the PCM multiplies short term compensation by long term adaptive as well as a purge fuel multiplier and the result is below a certain value for 30 seconds over POSSIBLE CAUSES GOOD TRIP EQUAL TO ZERO O2 SENSOR HEATER OPERATION O2 SENSOR EVAP PURGE SOLENOID OPERATION O2 SIGNAL CIRCUIT O2 RETURN CIRCUIT MAP SENSOR OPERATION ECT SENSOR OPERATION ENGINE MECHANICAL PROBLEM FUEL FILTER/PRESSURE REGULATOR PCM TEST ACTION APPLICABILITY 1 NOTE: Check for contaminants 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. 105 DRIVEABILITY - NGC |