Greetings,
My car decided to die while driving the day, seemed like it ran out of gas, would not restart. I've been reading here the past couple days, have run a few tests and believe my ECU has decided it's time for a rest. Here are some details:

1991 240 wagon
LH 3.1
Car starts/runs when fuse #4 is jumped to #6.
12V present at Fuel Pump Relay, red and orange wires
Car starts/runs when the blue/green wire at Fuel Pump Relay is jumped to ground.


The car has ECU, Bosch # 0 280 000 572

Person at local scrap yard tells me I should run a 0 280 000 951

He claims the only dif. LH 2.4 to LH 3.1, is the AMM and the TS and that the computers are totally interchangeable.

I'm hoping Art and other FI experts will have some knowledge here and know weather I can run the easier to find ECU.

Thanks,
Scott

Thought this a good place to ask?

Problem STARTING 1991 240 Volvo???

My 240 started fine but over time it had to crank more and more before Cold Starting. Warm starts were for a time Great. In time....year or so warm starts took more turnover time than norm. Eventually Car would not start overall when cold. Every once in a while on cold day it started instantly as a New Car would. Now it is rare that I can start the Car, When it does get started if idles and runs great... steady even RPMs???

I'm not actively trying to sell them but if you can't find a 572 I have both a purple label and a white label. Both are tested and working.

Good morning, I tried to send you email through the system yesterday but have been notified that it hasn't been sent yet -- ??

I could use a white label 572, do you have price in mind? I'd like to drive my car :)

Thanks,
Scott
--
Now I lay me down to sleep I hear the sirens in the street All my dreams are made of chrome I have no way to get back home - Tom Waits

I didn't receive one yet. I'll try to send one to you.

I think I saw a 572 in my PnP last week. Dark red label in a 5-speed sedan. I hope to go out there tomorrow and if it is a 572, I will grab it.

Mike

There may be a "top shelf" red label, but the only ones I have seen are white labels. If it is a 572, snag it, they are rare.

jorrell
--
92 245 307K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!

Will do. Sounds like I should nab the AMM as well.

Anything else worthwhile...the PnP is having a 30% off Independence Day sale.

Hey Mike, if you end up with too many 572's, let me know, OK?

I have no use for any of it nor do I see a future need (DW has made the edict no manual cars). I was thinking more of the public good if they are that rare I will list them on the PnP page for those lucky few with an LH 3.1.

I will be out there in the fresh mud because I am hoping they will have released the '90 240DL sedan that is the twin to mine but had not yet been "processed" last week. I need all kinds of interior and exterior trim goodies.

Did you mange to snag the 572?
--
Now I lay me down to sleep I hear the sirens in the street All my dreams are made of chrome I have no way to get back home - Tom Waits

It stormed yesterday all morning and then I got (still am) caught up in remodeling activities.

I will warn you that what I thought was dark red is probably the the purple label that will be fatally flawed. If I make it there tomorrow, I will grab it if it is not a purple label. I will still grab the other specialty stuff for 3.1 even if it is a purple label.

Purple label 572's suffer the same failure mode as the pink 561's so be carefull and don't assume its good. I've seen a 3.1 in the yard junked for bad purple label 572.

On an LH-3.1 pull the entire throttle body along with the Throttle Position Sensor (not switch) like the LH-2.4. The throttle bodies are incompatible between 2.4 and 3.1.

jorrell

--
92 245 307K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!

Hi Scott,

You've diagnosed the issue correctly.

Car starts/runs when the blue/green wire at Fuel Pump Relay is jumped to ground.

Barring a pushed out terminal on that wire, that's all you need for a conviction.

No, the 951 will not work. But, if you cannot locate a 572, you can wire a k-jet fuel pump relay to do the safety job that's needed. Here's a map of one such relay. You would ground pins 31 and 87, run a wire from 31b to the ignition coil negative (or the white/red tach wire behind your instrument cluster), run terminal 30 to your blue/green FI relay coil terminal, and splice in ignition-switched battery (avail at the FI relay term 87 or from either orange wire) to term. 15 of your new relay.

A k-jet relay may be harder to find in the yards these days, but FCP has one for $23. p/n 1348600 or 3523637.



--
Art Benstein near Baltimore

Time may be a great healer, but it's a lousy beautician.

Thanks Art! I'd planned an order to FCP this evening, last day of their sale, etc. I'll add in a green relay and use your fix until I can find the ECU of my dreams.

Have you tried replacing the fuel pump relay? It is incredibly rare for an LH-3.1 ECU to fail... I assume your car has a five speed and not an AW-70 automatic. If it came with an auto from the factory and someone installed a 572 ECU, i'd be very surprised given their rarity. If it has an automatic trans, it is NOT an LH-3.1 car.

On my 92 245 LH-3.1, it has a 0 280 000 572 just like yours. I doubt very seriously that a 0 280 000 951 would work in an LH-3.1 without swapping the throttle body and AMM as well as hacking the harness in both places. But of course, I have never tried it personally so I could very well be wrong.

If it runs correctly with a 951 I would be stunned.

jorrell
--
92 245 307K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!

When I bought the car it wouldn't go, I pulled the fuel relay, soldered it up and drove off, pretty cool.

I did replace the Fuel Pump Relay last year (when there was some stalling at hywy speed) along with the Crank Speed Sensor (it started to work again so I skipped the tank pump). And I bought a spare Fuel relay. I just tried both new relays with the same negative results. They both look clean and fresh, nice shiny solder.

The car does have an OEM 5-speed. All the goodies, AMM, throttle switch, ECU are all the stuff for LH3.1.

As I understand, when the key is turned, the ECU should ground the b/g wire leading into the fuel relay causing it to activate which fires up the two pumps. When I jumper the pumps, it starts. There is power at the relay. When I supply ground to the relay (which the ECU should do) the relay activates, pumps bring fuel to the rail, and it starts. Sure seems like the ECU is skipping it's job of grounding the fuel relay.

But, could there be another problem that is causing the ECU to not know it should fire up the relay or should I go shopping for, gulp, replacement 572??

That said, anyone have a clue as to where one finds a 0 280 000 572?

-Scott

If your 572 has a colored label, it may have the same failure as plagued the pink label 561 of not suppling the ground to the fuel relay.

Check ebay for an ECU, I have only ever seen a couple of these in years of trolling the bone yards.
Dan

The failure is attributed to the hybrid microcircuit. For a long time, I wasn't certain the label color correlated to the updated hybrid, but Mike (hardknocks!) did some research in the yards (looking inside) in enough volume to convince me the ones with a white label are rid of this problem.

Dan, you might remember this post showing the difference: http://www.brickboard.com/RWD/volvo-990665.html

I suppose, it is theoretically possible for an electronic technician to cannibalize a white label unit like a 951 for its hybrid to fix a 572 with this issue. What are those white label ECU's worth these days?
--
Art Benstein near Baltimore

You're getting old when you get the same sensation from a rocking chair that you once got from a roller coaster.

Just for fun and possible future use, here's the hybrid board in the failed purple label 572 we've been discussing.
-Scott
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Now I lay me down to sleep I hear the sirens in the street All my dreams are made of chrome I have no way to get back home - Tom Waits

Yes, I recognize that as the old one. Fixing one of these is beyond my abilities. I'd take whatever you can find, purple or white, over the k-jet hack, to give you time to get a spare like Jorrell did.

Having 5 LH2.4 cars, it is a no-brainer for me to have a spare ECU and AMM, but the same problem exists for those who only have one to maintain. The fuel pump problem is easy to diagnose, but there's a myriad of other symptoms that can arise from less typical faults in either of these two "black boxes" that makes having a cheap, tested, junkyard-acquired spare a smart move.
--
Art Benstein near Baltimore

"I don't think you can get cold in Volvo 240 series. The AC can't do it and the heater won't let you." -darkdelta

Art
I remember that, I pulled a cover or two off dead pink 561 a few years ago to check.
Dan

Northern European Auto, here in the maritime NW, charges $275. ebay people are looking for about $110.
I like your cannibal, not sure I could pull it off...

I have heard of one other rare failure that might be causing the problem, but I'm not ruling out a bad 572. Unplug the connector from the ECU and look for a female contact in the harness connector that is pushed down or black "burned up". If you can't see it, that is probably not the problem.

One last thing to check would be the harness connector for the fuel pump relay, any molten contacts?

As far as where to find a 572 ECU, I don't have a lead for you beyond Europe where they were more common. I have a spare that took me six months to find locally, but with 313K miles on the original, I won't sell it.

jorrell

ps. Check out the online rebuilders, they might be able to repair it for you if that is the problem.
--
92 245 307K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!

The connectors all look good. Good thing.

I'll look at the rebuild idea too, if they're not too crazy about the price that might be a nice option.

They are not interchangeable you need a 572.

Your problem sounds like a failed fuel system relay. Jumping fuses 4 and 6 bypasses the relay and forces the fuel pumps to run, but they will run all the time and will not stop when you take the key out.
You may be able to re-solder the circuit board as cracks develop between the circuit board and the relay. Or just replace it with a known good used one.
Dan

My 3.1 died. Tried 2.4, not compatible. 3.1 is not that hard to find. Good luck!