P0002

Fuel Volume Regulator Control Circuit Range/Performance

Indicator

This code is stored when an abnormal voltage reading has been detected in the electronic fuel volume regulator circuit.

Code Set Parameters

A “voltage drop” method is used by the PCM to determine whether a fault is present in this electrical circuit. Any variation in this circuit of more than 10-percent from battery voltage (power and ground) or sensor voltage (sensor circuit) should initiate a stored trouble code and result in illuminating the malfunction indicator lamp.

Symptoms

The malfunction indicator lamp is illuminated and a trouble code is stored.

Common Causes

Variations in circuitry voltage caused by broken or shorted wiring, corroded or unplugged electrical connectors, and a faulty electronic volume control regulator are the most common. A faulty PCM can also cause this code to be stored but this is a rare occurrence. The most common cause of this trouble code is wiring and connectors which have been damaged by wildlife (gnawed wiring). Some code reading devices and scanners are known to exhibit this code falsely. This is more common than any of the other causes.

Common Misdiagnosis

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. Thoroughly inspect and test system wiring and electrical connectors prior to replacing components. Failure of the electronic volume regulator or PCM is extremely rare.

Diagnosis

  • A voltage/ground drop method should be used to diagnose this trouble code, once it has been determined that the code is actually present
  • If a voltage drop is present, then inspect electrical connectors and measure continuity in all of the system wiring until a fault has been located or all possibilities have been exhausted
  • 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.