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ECU Swap: ARD Green from unknown year into '97 T-5 Topic is solved

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1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
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P80
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Joined: Mon Jan 09, 2017 10:38 am
Year and Model: 1997 850 T5
Location: Denver USA

ECU Swap: ARD Green from unknown year into '97 T-5

Post by P80 »

Hi All, first-time poster here, writing from Denver with a question about swapping ECU's that I couldn't manage to answer entirely on my own...Thanks in advance for your assistance.

I have a stock '97 850 T-5, VIN YV1LW5720V2293470.

My ECU part number reads: 0 261 203 072
My numbers under the four ECU barcodes: P09125331; c001; 1T26S4585; T96166325
My code on the right side in large type: GC.2

Someone local is selling an ECU with an ARD Green tune.

ECU PN: same as mine (0 261 203 072)
Bar code numbers: P01275389; c001; 1T26S3767; T95109168
Right-side code: 8.2
Seller's (somewhat confusing) notes: "It is tuned for denver elevation. 19lbs for either turbo. Its also tuned for a muffler delete but you could run it with a muffler as well Its a pretty general tune. It is for a glt."

While I have this info from photos, I don't know the year of the vehicle from which this ECU is sourced. Is anyone able to tell from this information if this ECU will work in my Volvo without causing a CEL from fault codes related to EGR or SAS or the like?

Also: the seller says that the ECU comes from a GLT / low pressure turbo car...Am I correct that it's still safe to run in my T5 / HPT?

While I'm at it, here are some more general / random ECU-related questions if anyone would care to comment:

Do these ARD Green tunes offer any performance improvements when simply plugged in without additional mods such as cam timing or wastegate setting adjustments?

What does the red button I've seen on the backside of ARD-tuned ECUs do? In the photos I've seen, it's in the middle of the four bar codes on the ECU.

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Post by bmdubya1198 »

The button, I believe, is for a "learning mode." It is for adjusting the ECU for your specific car. That's something I would ask ARD about before messing with it.
Anyway, the GLT tune should work safely with a T5, but you would have to see what turbo the tune was for. Being that it's a green tune, that's a pretty generic tune. It's not how ARD is now where you can select each individual option for a tune. Obviously, this more generic tune will not be as perfect as it could be, but it will work.
If you have a CEL come on depends on if the tune has the SAS or EGR delete. I don't think the '97 T5 (or any turbo) has EGR anyway. If your SAS is in place and working, you have nothing to worry about. It depends on if the ECU is tuned for the SAS delete. If it is, great. If not and it works anyway, great.
19 psi sounds like a lot for any turbo on this engine. I wouldn't run that without the right supporting mods.
Also, being that the tune is from a GLT, that makes it either a '97 or '98. 1996 and older GLTs were not turbo, and '99-'00 ran Motronic 7, which is physically a different ECU, so it won't fit anyway.
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P80
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Year and Model: 1997 850 T5
Location: Denver USA

Post by P80 »

Many thanks for the reply, bmdubya! Here's where I think all this is landing:

I have a 97 HPT with emission code "2" in the VIN = no EGR and no SAS.

I'm quite confident (despite conflicting info from seller) that the ECU is from a 95 HPT, hence emission code 1 = no SAS either, but it did come coded for EGR equipment.

SO, either the tune included an EGR delete -- and it won't trigger a CEL in my car -- or it's going to trigger a CEL if I run it in my car. (Right?)

HENCE this follow-up question for anyone in-the-know: if I were to put this ECU in my car and take it for a quick test drive, will the ECU trigger a CEL right away if this EGR conflict exists? I have a code reader and I could scan the car after a test drive...but does it take more than just a short drive for an EGR-related code to be triggered?

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Post by rspi »

What kind of car is the ECU out of?
'95 855 T-5R M, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red 25/32 mpg
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P80
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Year and Model: 1997 850 T5
Location: Denver USA

Post by P80 »

RobertDIY! Thanks for responding to my post. I'm not 100% sure...but my best guess is that the ECU came from the factory in a '95 Turbo wagon.

Hope you're feeling better. Take good care!

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Post by rspi »

I asked because the '98 programming is different from the '97 and older programming ECU's. I was told that if you run a '96 ECU in a '98, it can destroy the AC system. I'd probably try to give Lucy a call to figure out what car it will work in.
'95 855 T-5R M, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red 25/32 mpg
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Post by bmdubya1198 »

Depends where the ECU is originally from. Maybe it was installed in a '95 but came out of a newer car. I know people run Motronic 4.4 as an upgrade on 4.3 cars. But, the only 4.3 cars I think are early '97s, MAYBE late '96s.
If you put in the ECU and it has EGR but your car does not, it will probably throw a code for that. I don't know for sure, but I would assume that's how it will work since it is emissions related.
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P80
Posts: 5
Joined: Mon Jan 09, 2017 10:38 am
Year and Model: 1997 850 T5
Location: Denver USA

Post by P80 »

Thanks for the ongoing replies. Based on matching part numbers I've established that both my own ECU and the potential purchase are Motronic 4.3, so I'm good there. (Phew!)

The only real discrepancy that remains for me: the tuned ECU might be coded for EGR equipment and I know my car does not have that equipment.

So at this point my question is: if I install the tuned ECU in my car and drive it, how much driving is required before I can scan it with my code reader to see if the tuned ECU throws an EGR-related CEL? Similar to the elaborate requirements of getting sensors ready for OBDII emissions testing, is there a specific driving regimen required?

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Post by bmdubya1198 »

Usually these cars go through their testing cycle in about 40-50 miles. So, assuming this ECU is tuned for EGR, it will likely throw a code within that time frame.
00 V70R Venetian Red/Charcoal M56 Swapped 203k
05 S60R Sapphire Black/Nordkap M66 203k
07 XC90 V8 AWD Sport Titanium Grey/Black 183k
92 245 White/Beige 249k
00 S70 GLT Mystic Silver/Taupe 254k
99 BMW 528i
84 BMW 318i
Sold-
03 S60 2.4T
98 V70 GLT
91 944 Turbo
93 944
98 S90
95 850 GLT
01 S60 2.4T
88 744 Turbo M46

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