High Fuel Pressure P0089

[Aether556]

I’ve recently got an auction Nav, had injectors done when I got it, new ryco fuel filter and sat in the driveway for a couple months. Now driving it I’ve been getting error code P0089. I replaced the SCV + pedal dance and the issue has not changed. My scan tool says my idle FRP is at 50ish Mpa which I believe expected is 30Mpa. MAF sensor is reading 5g/s and at 2k revs getting around 60-70ish MPA on FRP and 20-25g/s MAF. Engine sounds a bit rich but isn’t misfiring just don’t get much boost when accelerating till I get the revs up then it comes all at once. I’ll get the code and go into limp mode when idling and I’ve been clearing it but it comes back next idle.

Where else should I be looking? Next up might be fuel rail pressure sensor and relief valve but it’ll be throwing money away replacing parts for the sake of it. Could my injectors have been mapped wrong causing the high pressure? Should I park her up till the pressure is fixed?

Any help would be great thanks.

 

[Old.Tony]

Your fuel rail should get up to 160MPa or more (YD25 = 1700BAR or 24000psi/165MPa, V9X = 1800BAR or 26000psi/180MPa). Idle should be around the 4500psi/31MPa region.

Boost is controlled by a number of factors. Can you confirm:

* Engine type - YD25 (4cyl) or V9X (6cyl)
* Is there a rubber hose or an electrical connection on the top of the turbocharger

 

[Nig]

Your fuel rail should get up to 160MPa or more (YD25 = 1700BAR or 24000psi/165MPa, V9X = 1800BAR or 26000psi/180MPa). Idle should be around the 4500psi/31MPa region.

Boost is controlled by a number of factors. Can you confirm:

* Engine type - YD25 (4cyl) or V9X (6cyl)
* Is there a rubber hose or an electrical connection on the top of the turbocharger

If your having fuel pressure problems the rail sensor would probebly be the problem.

 

[Chris Modra]

What did you do to resolve the problem? I have the exact same thing happening. Fault code P0089, and limp mode every time you stop at the lights. Happened after I changed the SCV valve, which was done on advice to improve the appalling fuel consumption - 16 lphk.

 

[Aether556]

What did you do to resolve the problem? I have the exact same thing happening. Fault code P0089, and limp mode every time you stop at the lights. Happened after I changed the SCV valve, which was done on advice to improve the appalling fuel consumption - 16 lphk.

I was doing the ecu reset from a YouTube video that happened to leave out the last step, which was once it’s in diagnostics mode you need to hold the accelerator pedal in for 10 more seconds to conduct a fuel pump relearn. The fuel pressure was just getting false readings cause it to run at bad ratio I assume. Below is an attached guide to conduct the full reset, this should fix your problem:

“To carry out the reset, carry out the following:

Turn the ignition on so all dash lights come on.

Wait 3 seconds.

PUMP the accelerator pedal 5 times within 5 seconds.

with the foot now OFF accelerator wait 7 seconds.

After 7 seconds, press and hold down the accelerator pedal for 10 seconds.

After 10 seconds, the Engine Management Light will start to flash, at this point, remove the foot from the accelerator.

The Nav is now in diagnose mode, so let the EML flash for a bit. Then press and hold the accelerator pedal down for more than 10 seconds., this will then reset ECU and fuel pump, etc., and put them into learning mode.”