17001 60u01 needed, I tried resoldering my unit but it's not working. I clearly had a thermal overload on pin 4, If anyone has a lead on one please let me know. I have already gone through one salvage recovery unit and I am finding little to work with at this point. I can bypass the unit but that is not what I want to do. Feel free to offer any advice. Cheers Mark

got your PM also.
the 60u01 is the revised design, they don't usually fail, but of course it's possible with age.
What is the pump history? worn out pump may have overstressed the FPCU.
Do you smell burned transistor?
get a magnifier, and check for loose solder points, also look for electrolytic caps that have started puking out.
Pictures may help.

It is great news to hear about the unit itself being robust, it at least provides me with more impetus and proper direction, I will have someone else solder that number four pin to the circuit board.

yeah, what's the inside look like?

The other common visible failure point is the 4 transistor looking things that are held with screws into the side of.the case as a heat sink. I say "transistor looking" because I think they're not all transistors. As 3Q mentioned, you probably need a new fuel pump if it hasn't been replaced recently. A bad one can sound like a hive of bees behind the back seat.

I loaded four pics sorry it looks like only two made it into the thread, Sorry to be so unorganized, I appreciate all your advice. Cheers Mark

New fuel pump FYI, the old one tested good but the car would die and then would start back up after coming to a stop. I knew the end was coming. I can rig around the control module and still get the car to run, but only at its medium output(it has three levels), tested fuel pressure was in the mid to high thirties. This was post fuel filter. The car drove fine had similar power to its normal output.

Worn fuel pumps will perform properly in terms of fuel pressure and volume, but pull too much current. This high current problem overheats the FPCU. Many new or good used FPCUs have been fried after being plugged in to an old fuel pump.

My unit from the salvage yard only met the new fuel pump. It exhibited the same issues as my fpcu. the Salvage Yard unit also showed the burned pin on number 4

Ahh ok. I wasn't comprehending that you replaced the pump. What kind of replacement did you use? I know the factory part is no longer available, so it's useful to know what aftermarket part people have had success running.

Bosch unit, it matched perfectly to the older unit. Without a doubt the most interesting fuel pump I have ever replaced. Mostly because of the location.

OK, we're getting somewhere!
pictures show that the solder repair is inadequate (sorry, just saying what I see).
did you ohm it before and after?
If you have better skills with more time, then I can recommend how to also augment that burned pin with a "white wire" that doesn't only rely on the circuit board trace.
so, you have a spare...hold on to it, I may be willing to have a go at it if you first tell me about any acrid odor (burned compenents), and we see a few more pictures.

I did not ohm them before, believe me it was worse. I have no illusions about my abilities concerning my soldering. No odor is present on any of the components, I am familiar with the smell of burnt capacitors. Let me know what additional pictures you require, I can also find someone younger than myself to solder that pin again along with augmenting the number 4 pin.

I'm most concerned with bulging of the caps and/or bulging or scorched transistors. look for 'acid burn' between the caps and the board (not so much the solder side). also if you see any cracked solder or lifting of the solder tabs on that side of the board.
If all that looks good, then it likely just needs the ground path upgrade.

From the look of that, the pin got baked because of either cracked solder or loss of plating on the pin. That's a chicken-and-egg thing, it's hard to say whether the solder failed and cooked the plating or the plating failed and melted the solder. Vis the repair, that solder repair is "cold". The trace is a power trace with lots of metal in it, so it will take a high-powered iron to repair it. A butane pocket-iron on high flame is probably your best bet. If you follow the trace on the board bottom, you'll see it's carrying power from a source all the way at the other side. The best repair will be to solder an 18~20AWG wire between the pin and the solder joints at the other end of the trace. Then clean up the bad pin with Deoxit or manual brushing and put some di-grease on it before reinstalling, that will protect the exposed metal from further corrosion due to the cooked plating.

PS - Trying to "touch up" factory solder joints without adding some fresh solder is a hopeless exercise. Get some .025~0.35" rosin core solder and add some to the joint as soon as it's hot enough to melt. Healthy joints will be shiny, a dull patina means over- or under-heating.

yup, what Vstar said.... he drew the path that I use the 'white wire' to augment. still need to make sure none of the other components are obviously shot, but it may be as easy as the parallel hardwire to resurrect your fpcu.
You can do it (have someone do it for you), or let me know if you need help. I'm not the world class solderer like the ladies I used to work with that build space rated hardware, but I've got decent equipment, and headgear to aid my aging eyes....

Thank you so much for your advice and insight. I have someone more skilled than me who will contribute his skill to what you have passed on. thanks again, will post again

VStar650CL wrote: ↑

Wed Mar 09, 2022 5:04 pm

Get some .025~0.35" rosin core solder and add some to the joint as soon as it's hot enough to melt.

Typo, sorry all. Should read 0.025~0.035".

I understand on the rosin core wire size, thanks again.

]Taking it to my soldering friend later this afternoon to check my recent solder. Thanks again for all the help

Hopefully that will get you going again!

PS: kudos for taking the time to measure and report your fuel pressure. Hard factual relevant data always helps with troubleshooting.

Thank you again for I was feeling somewhat helpless it is good to know the quality of advice available here on the forums. I love that Q45 and is still capable of putting a smile on my face. Pretty sure I have the front strut situation on the horizon once this fuel delivery system is in my rear view mirror.

About couple months ago, I had my FPCU go bad. I bought a new FPCU from Amayama. They ship Japanese car parts from Japan. Not cheap, about $400 shipped. Sounds like a lot, but it's a brand new unit from Nissan. Takes about 2 weeks to to get it. I replaced both the pump and FPCU, as recommended.

Thanks for the reply, I would have gladly paid that for the fpcu, glad you are having a good result.