Pinpoint Test MX: Fuel Control
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Contact with exposed fuel injector wiring, if energized, may result in electric shock. Use care when working on or around energized fuel injector wiring. Fuel injector wiring supplies high voltage to operate the fuel injectors. Failure to follow this instruction may result in serious personal injury.
WARNING:
Before working on or disconnecting any of the fuel tubes or fuel system components, relieve the fuel system pressure to prevent accidental spraying of fuel. Fuel in the fuel system remains under high pressure, even when the engine is not running. Failure to follow this instruction may result in serious personal injury.
WARNING:
Do not smoke, carry lighted tobacco or have an open flame of any type when working on or near any fuel-related component. Highly flammable mixtures may be present and may be ignited. Failure to follow these instructions may result in serious personal injury.
WARNING:
Do not carry personal electronic devices such as cell phones, pagers or audio equipment of any type when working on or near any fuel-related component. Highly flammable mixtures may be present and may be ignited. Failure to follow these instructions may result in serious personal injury.
WARNING:
When handling fuel, always observe fuel handling precautions and be prepared in the event of fuel spillage. Spilled fuel may be ignited by hot vehicle components or other ignition sources. Failure to follow these instructions may result in serious personal injury.
WARNING:
Clean all fuel residue from the engine compartment. If not removed, fuel residue may ignite when the engine is returned to operation. Failure to follow this instruction may result in serious personal injury.
NOTE:
Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.
Normal Operation and Fault Conditions
Refer to the DTC Fault Trigger Conditions.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| PCM P0171:00 | System Too Lean Bank 1: No Sub Type Information | Sets when the PCM detects an error in the air to fuel ratio exceeds a calibrated limit. This DTC may be accompanied by other Diagnostic Trouble Codes (DTCs). Diagnose all other Diagnostic Trouble Codes (DTCs) first. |
| PCM P0172:00 | System Too Rich Bank 1: No Sub Type Information | Sets when the PCM detects an error in the air to fuel ratio exceeds a calibrated limit. This DTC may be accompanied by other Diagnostic Trouble Codes (DTCs). Diagnose all other Diagnostic Trouble Codes (DTCs) first. |
Possible Sources
- EGR system
- EGR valve
- Exhaust system concern
- Fuel control system concern
- Intake air system concern
- Turbocharger system concern
- Air filter
- MAF sendor
- EGR valve
- Fuel rail pressure sensor
- Fuel pressure control valve
- NOX sensor