P0172

Tests 1 - 2:

Tests 3 - 7:

Tests 8 - 10:

Tests 11 - 14:

SYMPTOM
P0172 - 1/1 FUEL SYSTEM RICH

WHEN MONITORED
With the engine in closed loop mode, the ambient/battery temperature above -5 °C (20 °F) and altitude below 8000 ft.

SET CONDITION
If the PCM multiplies short term compensation by long term adaptive and the result is below a certain value for two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored.

POSSIBLE CAUSES
- Fuel pump module defective
- TPS voltage change not smooth
- TPS voltage < 0.92V
- Fuel inlet strainer plugged
- ECT sensor defective (out of calibration)
- MAP sensor defective (out of calibration)
- Engine mechanical problem
- Fuel filter/pressure regulator defective (high)
- Fuel filter/pressure regulator defective (low)