Fuel System 2/1 Lean Control Below Limit (At Load)

P0174 - FUEL SYSTEM 2/1 LEAN CONTROL BELOW LIMIT (AT LOAD)

P0174 - Fuel System 2/1 Lean Control Below Limit (At Load):

WHEN MONITORED
With the engine running in closed loop mode, the ambient/battery Temperature above -7° (20° F), altitude below 2590m (8500 ft). and fuel level greater than 15%.

SET CONDITION
If the PCM multiplies short term compensation by long term adaptive
And a certain percentage is exceeded for two trips, the MIL illuminates and a trouble code is stored.

POSSIBLE CAUSES
- Restricted fuel supply line
- Fuel pump inlet strainer plugged
- O2 sensor signal circuit
- O2 sensor ground circuit
- O2 sensor heater operation
- Manifold absolute pressure sensor operation
- Engine coolant temperature sensor operation
- Engine mechanical problem
- O2 sensor
- Fuel pump
- Fuel contamination/exhaust leak


DIAGNOSTIC TEST




1. CHECK FOR CURRENT DTC

Turn the ignition on.
With the DRB III(R), read PCM DTCs.

Q: Is this DTC present?

YES: For complete diagnosis of this DTC, refer to (P0172) FUEL SYSTEM 1/1 LEAN CONTROL BELOW LIMIT (AT LOAD). P0172

NO: Go To 2

2. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

NOTE:
- Check connectors - Clean/repair as necessary. Poor pin to terminal connections can set DTCs. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors specific to this DTC. Wiggle the wires while checking for shorts and open circuits.
- Check for any Technical Service Bulletins that may apply.

Q: Were there any problems found?

YES: Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test - Ver 2

NO: The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition.