P0004 Code- Fuel Volume Regulator Control Circuit High

What Does Code P0004 Mean

P0004 is a generic OBD-II code indicating an issue with the engine control module (ECM) not reading signals from your fuel shut-off on your fuel injection rail mounted to your engine.

The ECM uses the fuel shut-off valve to stop fuel from entering the engine when you turn it off. By doing so, it prevents your engine from continuing to run after you turn the key off (a term we call ‘dieseling’). The code will cause this problem and set a Check Engine Light.

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Possible symptoms

• Engine Light ON (or Service Engine Soon Warning Light)

Possible causes

• Faulty Fuel Volume Regulator (FVR) Control Solenoid
• Fuel Volume Regulator (FVR) Solenoid harness is open or shorted
• Fuel Volume Regulator (FVR) Solenoid circuit poor electrical connection

Troubleshooting P0004

The following steps will help you troubleshoot a P0004 code:

• Perform a visual inspection of the FVCV and connection.

Many problems can easily be found in the harness and connectors. So, begin your diagnosis by visually inspecting the FVCV and its connection.

• Test the FVCV solenoid

After the visual inspection, the next step is to test the FVCV. Do this by connecting a current probe to the power supply wire. With the engine running, current draw should be between 35 to 80 MA depending on the manufacturer.

You can also test the internal resistance of the FVCV solenoid. Touch a meter lead to each terminal on the solenoid. Consult the manufacturer’s specifications for acceptable resistance value. Anything great than specification or a reading of out of limits (OL), means the FVCV solenoid is bad and should be replaced.
While testing the FVCV can be done with a multimeter, it is even better to test it with an oscilloscope. Using a scope, the FVCV should produce a nice, square duty cycle waveform.

Example of a duty cycle waveform pattern
(Courtesy: .electronics-tutorials.ws)

• Check the circuit

If the FVCV checks out OK, but you still have P0004 code illuminated, you’ll need to check the circuit.
The FVCV will have two wires going to it: power and PCM controlled ground. Consult the repair manual for your vehicle to determine which wire is which.

Disconnect the FVCV connector and touch one end of a test light to the B+ pin. Connect the test light clamp to the battery negative post. The test light should illuminate. If it does not, there is problem in the power supply circuit and you will need to consult the factory wiring diagram.

Finally, check that the PCM is grounding the negative side of the circuit. Disconnect the FVCV connector and touch one end of a test light to the ground pin. Connect the test light clamp to the battery positive post. Crank the engine. If the PCM is grounding the circuit, the test light should flash. If it does not, there is either an open in the ground side of the circuit or problems with the PCM.

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