P0172

Tests 1 - 3:

Tests 4 - 8:

Tests 9 - 12:

Tests 13 - 17:

Test 18:

SYMPTOM
P0172-1/1 FUEL SYSTEM RICH

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 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
- Intermittent condition
- Restricted fuel supply line
- Fuel pump inlet strainer plugged
- Fuel pump module
- O2 Sensor heater operation
- O2 Sensor
- EVAP System operation
- O2 Sensor signal circuit shorted to voltage
- O2 Sensor signal circuit open
- TPS Voltage greater than 0.92 volts with throttle closed
- TP Sensor sweep
- MAP Sensor operation
- ECT Sensor operation
- Engine mechanical problem
- Fuel filter/pressure regulator (high)
- PCM