P0172

Test 1:

Tests 2 - 5:

Tests 6 - 9:

Tests 10 - 12:

Tests 13 -14:

SYMPTOM:
P0172 - 1/1 FUEL SYSTEM RICH

WHEN MONITORED
With the engine running in closed loop mode, the ambient/battery temperature above 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 filter/pressure regulator (high pressure)
- Kinked/restricted fuel supply line
- TPS voltage greater than 1.1 volts with throttle closed
- Fuel pump inlet strainer plugged
- Fuel pump module
- MAP sensor (out of calibration)
- TPS voltage change not smooth
- ECT sensor (out of calibration)
- Fuel pump capacity (volume) out of specs
- Engine mechanical problem