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Another P0089 issue

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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iastoddard
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Another P0089 issue

Post by iastoddard » Fri Nov 08, 2019 5:12 pm

My first post to this forum....
I have a 2007 XC70 automatic, for which I am grateful, bought used with 165k miles. It needs its annual inspection. It is currently throwing a code after two starts or ~30 miles after CEL reset - (P0089) Fuel Pressure Regulator 1, which is an auto-fail.

I have replaced the Fuel Pressure Sensor at the end of the rail, and the fuel filter. I do NOT have a damper on the fuel rail, despite my chassis number being 261xxx. I have what looks like the fuel line connection instead, between the last and second-last injectors instead of in the middle. I am attaching the view from the front.
FuelLineToRail-10.jpg
FuelLineToRail-10.jpg (40.48 KiB) Viewed 73 times
I hope the fitting is recognizable. (The pic is sideways, a pipe runs into the bottom of this fitting, and its top is in the rail.) My PEM is in the spare tire well.

A Volvo friend told me that he had a pinch in the fuel line near his steering rack that made his car throw the code. I hope to check for this next.
If my cause is the fuel line, is it in fixed pieces, requiring distinct replacement parts, or generic "by the foot" ?

Next I hope to get to O'Reilly's to check fuel pressures at the rail. I will add to this thread when I get the readings.
Thanks for any help.

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Re: Another P0089 issue

Post by RickHaleParker » Mon Nov 11, 2019 5:38 am

Possible sources
  • Leakage in the fuel lines
    Blocked fuel filter or other restrictions.
    Dirt, debris, or loose objects in the fuel tank.
    Damaged fuel pressure sensor
    Damaged fuel pump
    Damaged fuel pump control module.
2019-11-11.png
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iastoddard
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
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Re: Another P0089 issue

Post by iastoddard » Mon Nov 11, 2019 9:03 pm

Thanks for the parts diagram / Vida dump. Is #14 fastener used to fasten the #1 fuel line to #5 rail? Does #3 pipe go back to the tank?

Dirty fuel? Hmmmm. I should be able to see that come out of the Schrader valve into a jar, no?

My chassis is (1)261968 and has no fuel pressure damper fitted. I cannot see how to map this into the 7-digit 2815xxx used in the parts catalogs. Got any hints?
2007 (silver + black leather) XC70, bought used with 156000+ miles
Front clip seems to have damage, no right fog light.

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Re: Another P0089 issue

Post by iastoddard » Sat Jan 25, 2020 10:07 am

Ok. Got the fuel pressure gauge. Attached to schraeder. No residual pressure before start. Crank motor. Goes up to 50+ psi, then settles to ~45 psi. DOES NOT HOLD PRESSURE. Leak down slow but noticeable. Might have been gauge connection but experienced assistant doubts it - no gas leak touchable. Visual check of gas line shows no pinches.

Which is more likely, leaky injector or bad PEM (trunk mounted)? Hmmm. How can I check PEM ground? What is pin-out? I know it is pulse-code unit, looking for reference ground.
2007 (silver + black leather) XC70, bought used with 156000+ miles
Front clip seems to have damage, no right fog light.

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Re: Another P0089 issue

Post by abscate » Sat Jan 25, 2020 1:54 pm

Bad PEM more likely imho.

You need a oscilloscope to troubleshoot the PEM, or risk $25-30 on eBay swap

There is a link to the waveforms in this forum for those with a scope
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Re: Another P0089 issue

Post by iastoddard » Tue Feb 04, 2020 12:00 pm

Link does not work for me because of a site issue.

I found the color waveforms earlier, in viewtopic.php?f=9&t=92716
If that was your ref.
2007 (silver + black leather) XC70, bought used with 156000+ miles
Front clip seems to have damage, no right fog light.

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