MR2 Roadster Owners Club

The Workshop => Maintenance, Problems & Troubleshooting => Topic started by: J88TEO on October 12, 2022, 23:01

Title: P0001 code - fuel volume regulator control - open circuit
Post by: J88TEO on October 12, 2022, 23:01
One of my 2 ( left standing for almost 2 years ) has thrown up this code.
What does it mean?
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: Ardent on October 12, 2022, 23:09
is your 2 a stock 2?

Not seeing that code listed against the 2

P0100 but not P0001
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: J88TEO on October 12, 2022, 23:25
Stock 1zz 5 speed.
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: Call the midlife! on October 13, 2022, 09:32
If it's been stood a while it could be that something has chewed the wiring on the top of the fuel tank...
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: Carolyn on October 13, 2022, 09:40
The code list starts at 0100, as Ardent says: "Mass or volume airflow malfunction".  That indicates a problem with the MAF circuit.  A disconnect and good cleaning of the MAF and the connector contacts with contact cleaner would be my first stab at it.  Take the O ring off before you do it, as the solvent will destroy it.
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: J88TEO on October 13, 2022, 10:23
Strange.....

(https://i.ibb.co/88QdMYJ/image000000.jpg) (https://ibb.co/88QdMYJ)

Definitely says P0001 on the reader. Am scratching my head!
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: Carolyn on October 13, 2022, 10:37
Quote from: J88TEO on October 13, 2022, 10:23Strange.....

Definitely says P0001 on the reader. Am scratching my head!

Try a different code reader?  Torque Pro with a dongle?  Is the engine management light on?
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: J88TEO on October 13, 2022, 10:52
Yes....
will borrow a different reader from my mate and see what code comes out.
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: Alex Knight on October 13, 2022, 17:33
https://obd2pros.com/dtc-codes/p0001/

Fuel pressure regulator, fuel pump, or most likely, injector(s).
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: Dev on October 13, 2022, 19:27
 Unfortunately and fortunately our cars fuel regulation has no sensor or control system.
 Its purely mechanical and if there is a fault in the fueling it is generally either a lean, rich or misfire.
 I think this is an interesting case non the less and another code reader is the best approach.
 
 A better question would be, how is the car running?

Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: Dev on October 13, 2022, 19:39
 If you have old fuel in the car I would recommend either draining the tank or if it has little fuel adding dryer into the tank to absorb the water and then add fuel to dilute the old.
I let me car sit for over 2 years, years ago with stabilizer which is only good for one year. I had misfires and codes that went away after adding fresh fuel. The car idled fine but when you opened the throttle a little it would sputter.

Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: Carolyn on October 13, 2022, 19:53
Quote from: Dev on October 13, 2022, 19:27Unfortunately and fortunately our cars fuel regulation has no sensor or control system.
 Its purely mechanical and if there is a fault in the fueling it generally either a lean, rich or misfire.
 I think this is an interesting case non the less and another code reader is the best approach.
 
 A better question would be, how is the car running?



I agree.  I was pretty sure the pressure regulator was purely mechanical and there is no related sensor.  Stale fuel is a decent bet....
Title: Re: P0001 code - fuel volume regulator control - open circuit
Post by: Dev on October 13, 2022, 22:02
Quote from: Carolyn on October 13, 2022, 19:53I agree.  I was pretty sure the pressure regulator was purely mechanical and there is no related sensor.  Stale fuel is a decent bet....

 I replace one during the time of trying to trouble shoot negative fuel trims. It sits on the fuel pump housing. It ended up being a MAF that has fallen out of calibration.
 These fuel pressure regulators are spring type that almost never wear out. Toyota keeps it dead simple unlike other manufactures.