Technical Description of OBD-II Trouble Code
The learning limit for the Fuel Volume Regulator Control has been exceeded
What does that mean?
This generic powertrain diagnostic trouble code (DTC) is applicable to various OBD-II vehicles, including Land Rover, Ford, Alfa Romeo, Toyota, etc.
If your vehicle has stored a code P000E, it indicates that the powertrain control module (PCM) has detected an issue with the fuel volume regulator (fuel metering control valve).
The malfunction is related to the PCM’s ability to control the fuel volume supplied to the engine. The learning limit refers to the extent to which the PCM is programmed to adapt in order to activate the solenoid of the fuel volume control valve.
In my personal experience, the electronic fuel volume control system is only used in diesel engines with a common rail fuel injection system. Exercise caution when servicing the high-pressure fuel system.
The fuel volume regulator consists of two parts that work together. An electronically controlled solenoid operates an in-line valve that adjusts the fuel volume accordingly. In some cases, the fuel volume regulator may also have an integrated fuel volume sensor. Other vehicle applications may use a fuel volume sensor in the fuel supply line or fuel injector rail. A fuel return line allows excess fuel to be safely redirected back to the fuel tank when the volume needs to be reduced.
The fuel volume regulator is typically located in the fuel supply line between the fuel tank and the fuel rail. It is an electronically controlled valve that remains fully open during normal operation (when not energized). When the PCM needs to restrict the fuel volume, the fuel volume control regulator circuit is completed using varying levels of voltage. The valve is opened or closed based on the amount of voltage applied to the circuit.
The fuel volume sensor signal is sent to the PCM, which takes the necessary steps to adjust the fuel volume through the regulator. If the input signal from the fuel volume sensor indicates that the actual fuel volume cannot be adequately controlled by the PCM, a code P000E will be stored and a malfunction indicator lamp may illuminate.
What is the severity of this DTC?
As with any code related to a high-pressure fuel system, the P000E should be addressed with some level of urgency.
What are some of the symptoms of the code?
Symptoms of a P000E engine code may include:
What are some of the common causes of the code?
Possible causes for this code may include:
What are some P000E troubleshooting steps?
Tools
The tools you may need to diagnose a P000E code may include:
I would typically start the diagnosis by locating the vehicle’s diagnostic port and connecting the scanner. I would retrieve all stored codes and related data to assist in the diagnosis. Next, I would clear the codes and, if possible, test-drive the vehicle to see if any codes reappear.
Search for technical service bulletins that match the symptoms, stored codes, and specific vehicle. The appropriate TSB can greatly assist in diagnosing this code.
If the P000E code is immediately reset, proceed by using the fuel pressure gauge to check the fuel system pressure and measure the fuel volume. Refer to your vehicle information source for specifications regarding fuel pressure and fuel volume. Follow the fuel volume and fuel pressure testing guidelines closely, as mishandling the high-pressure fuel system can cause serious bodily injury.
If the fuel volume is within the manufacturer’s specifications:
Use the DVOM to check for reference voltage at the fuel volume sensor. A 5-volt reference signal is typical, but consult your vehicle information source for exact specifications for the specific vehicle. If no reference voltage signal is found at the fuel volume sensor connector, check the corresponding circuit at the PCM connector. Disconnect all related controllers before using the DVOM to test resistance and continuity. If no reference voltage is detected at the PCM connector, suspect a problem with the PCM or a programming error. If reference voltage is found at the fuel volume sensor connector, use the DVOM to check for a ground. If no ground is found, trace the ground back to its source as described in your vehicle information source. Make any necessary circuit repairs.
If both reference voltage and a ground are found at the fuel volume sensor connector, use the DVOM to test the fuel volume sensor itself. Your vehicle information source should provide specifications and procedures to assist in this task. If the sensor does not comply with the specifications, consider it defective.
If the fuel volume is not within the manufacturer’s specifications:
Test the fuel volume as it enters the fuel volume regulator valve. If the input fuel volume is below specifications, suspect a defective fuel pump or a clogged (in-tank) fuel filter. If the input fuel volume is within specifications, check the output fuel volume at the regulator. If the output fuel volume is not within specifications, use the DVOM to test the fuel volume regulator solenoid according to the manufacturer’s specifications.
The fuel volume regulator is often mistaken for the fuel pressure regulator. Avoid making this mistake.
