P0174

Tests 1 - 4:

Tests 5 - 8:

Tests 9 - 11:

Tests 12 - 15:

Test 16:

SYMPTOM
P0174-FUEL SYSTEM 211 LEAN

TEST NOTE
This symptom is diagnosed using the test P0171-FUEL SYSTEM 1/1 LEAN.

WHEN MONITORED
With the engine running in closed loop mode, the ambient(battery temperature above 20 deg. F and altitude below 8500 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
- Intermittent condition
- Restricted fuel supply line
- Fuel pump inlet strainer plugged
- Fuel pump module
- O2 sensor
- O2 sensor signal circuit
- O2 sensor heater operation
- O2 sensor return circuit
- Throttle position sensor voltage greater than 0.92 volts with throttle closed
- Throttle position sensor sweep
- MAP sensor operation
- ECT sensor operation
- Engine mechanical problem
- Fuel filter/pressure regulator (high)