P0174

Tests 1 - 2:

Tests 3 - 6:

Tests 7 - 8:

Tests 9 - 10:

SYMPTOM
P0174 211 FUEL SYSTEM LEAN

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 a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored.

POSSIBLE CAUSES

- TPS voltage change not smooth
- TPS voltage < 0.92 V
- ECT sensor (out of calibration)
- MAP sensor (out of calibration)
- Engine mechanical problem
- Fuel filter/pressure regulator high
- Fuel filter/pressure regulator low
- Fuel pump capacity (volume) out of specs
- Fuel pump low output