P0001 – Fuel volume regulator control -circuit open
Last Updated 2016-09-06
ASE Master Tech
|Code||Fault Location||Probable Cause|
|P0001|| Fuel volume regulator control -circuit open |
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|Wiring, regulator control solenoid|
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Table of Contents
- What Does Code P0001 Mean?
- What are the common causes of code P0001 ?
- What are the symptoms of code P0001 ?
- How do you troubleshoot code P0001 ?
- Codes Related to P0001
- Get Help with P0001
What Does Code P0001 Mean?
The diesel fuel system contains a low-pressure and high pressure side. The low pressure side consists of the tank, pump, filters, water separator, bleeder valves and necessary fuel lines. The high pressure side varies according to injection type, but typically consists of a high pressure pump and fuel rail.
A typical common rail diesel fuel system
The fuel volume control valve (FVCV) is found on high pressure pump on most modern common rail diesel engines. It regulates the volume of fuel from the internal transfer pump to the high pressure pumping components. The valve adjusts the low pressure side of the system to meet the demands of the engine.
The FVCV is a duty cycle controlled solenoid controlled by the PCM. One side of the solenoid receives battery power, and the other is intermittently grounded by the PCM.
The combination of the FVCV and the fuel pressure control valve (FPCV) is used to correctly supply fuel to the engine. The fuel pressure sensor monitors FVCV and FPCV operation and informs the powertrain control module (PCM) of any changes.
A typical fuel volume control valve and high pressure pump
The code P0001 stands for fuel volume regulator control circuit. The PCM monitors the state of the FVCV circuit and sets this code when it finds a problem.
Note: Circuit Open means that a component or sensor in a system is deprived of the reference voltage it needs to work. Causes of open circuits are many and varied, but for the most part, this type of code is caused by broken wiring, poor connections across electrical connectors or previously repaired wiring, loss of ground that prevents current flow, blown fuses, defective relays, faulty switches, or any of a host of other issues and problems that prevents the flow of current through wiring.
What are the common causes of code P0001 ?
To sum things up, the common causes for code P0001 are as follows:
Faulty fuel volume control valve
Fault in the FVCV circuit
Problem with the PCM
What are the symptoms of code P0001 ?
Besides an illuminated check engine light, there are other symptoms that might accompany a P0001 code. These include lack of power and a no start condition.
How do you troubleshoot code P0001 ?
The following steps will help you troubleshoot a P0001 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 DVOM lead to each terminal on the solenoid. Consult the manufacturer’s specifications (All Data DIY) 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
- Check the circuit
If the FVCV checks out OK, but you still have P0001 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. All Data DIY is a good source for vehicle specific information.
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.
Codes Related to P0001
- DTC P0002: Fuel volume regulator control circuit range/performance
- DTC P0003: Fuel volume regulator control circuit low
- DTC P0004: Fuel volume regulator control circuit high
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It would pay to note that this code can also occur if there is water in the fuel tank, the sensor picks this up since water does not compress thus the sensor detected lowered pressure, had this come up on the carman scan today but the problem was water in the system
I got the Zafira car is getting problem cut out the engine when I do driving on the hill loose the power and management light come then cut out the engine, on the stationary position starting is fine, then I do turn the key with neutral position start again and I have been many workshop but problem is not getting finish and every fuel system sensor has been charged by mechanic
You’ll have to check the circuit between the ECM and the fuel volume control solenoid. This should be mounted on the high-pressure fuel pump. I think this image shows the part you need to test.
Shiv shakti wark shop.chhatarpur m.p