Fuel Volume Regulator Control Circuit Low
A P0003 Indicates that low voltage has been detected in the electronic fuel volume regulator circuitry.
Code Set Parameters
This system is monitored (by the PCM) using a voltage drop. If the voltage drops below a threshold of 10-percent less than that of the battery a code will be stored and a check engine will be illuminated.
A trouble code is stored and the malfunction lamp is illuminated.
Broken or shorted electrical wiring or connectors are a possible cause, as are a faulty electronic fuel volume regulator or PCM. Wildlife damage to exposed electrical wiring is the most common possibility. All of these other causes occur very rarely. Some diagnostic equipment may exhibit this code in error; therefore the actual existence of the code must be verified by using a scanner or code reader of a different brand.
This code is frequently set in error and if possible the system should be checked using a second scanner or code reader. If the second code reader does not detect the code then the vehicle should be operated to determine if the code will return. If the code is reset, carefully inspect connectors and wiring for wildlife damage (gnawed wiring). Faulty electronic volume control regulators rarely fail and the PCM fails even less frequently.
- If it is determined that conditions are present to store a P0003 and the code is indeed present, power, ground, and sensor voltage should then be measured
- If no inconsistencies are found in circuitry voltage, resistance should be tested in system wiring and in the electronic volume control regulator
- If all system circuitry and component readings are within specifications, then a faulty PCM could be the culprit
- Keep in mind that this scenario is very rare and more this than not this code is exhibited in error
- Since this code is often retrieved in error, use more than one type of scanner or code reader to determine if it is valid
- Reset the code and operate the vehicle to see if it returns.
Begin your diagnosis by visually inspecting all wiring and connectors
- Look for shorted or burned wiring and replace circuitry and connectors as required
If the system wiring, connectors, and components appear to be in normal working order, connect the scanner to the diagnostic connector and record all stored trouble codes and freeze frame data
- This information can be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored
- After the codes are cleared, operate the vehicle to see if the code returns
- If the code fails to immediately return, you may have an intermittent condition
- Intermittent conditions can prove to be quite a challenge to diagnose and in extreme cases may have to be allowed to worsen before a correct diagnosis can be made.