How use a BETA ecu on your 1.5L Wire Harness without REWIRING - Hyundai Forum: Hyundai Performance Forum
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post #1 of 33 Old 01-03-2006, 04:56 PM Thread Starter
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How use a BETA ecu on your 1.5L Wire Harness without REWIRING


After doing a little bit of research at work last night using webtech for the 2000 tiburon wiring and the factory shop manual for 97 Hyundai Accent (sohc) & (dohc) i discovered that there is NO DIFFERENCE between the accent pin out and the tiburon pin out...

THE WIRING PINOUT DIAGRAM FOR THE 98 HYUNDAI ACCENT 1.5L POSTED BY BLACK DEVIL IS INNCORECT.. (diagram for the 00 Tib 2.0L is 100% correct)


The only difference between SOHC (1.5L) & DOHC (2.0L or 1.5L) is that the sohc engine does not have

PIN 18 - Canister Close Valve (2.0L & 1.5L DOHC)
PIN 76 - Fuel Tank Pressure sensor (2.0L & 1.5L DOHC)

Every other PIN is identical FOR the 1.5L SOHC, 1.5L DOHC, and 2.0L DOHC

______________________________

So this mean that other then extending a few wires in the engine bay wiring is NOT an issue... All that has to be done is

1) find the stock ecu and unplug it
2) remove and replace with the 2.0L ecu
3) Plug the ecm harness into the 2.0L ecu
4) Start you beta and enjoy

PROPER IDLE AND NO MORE CEL!!!!!!!! RUNS PERFECT!! Should now also be 100% emmission compliant as it's running proper ecu now!!


Here is the correct diagram.. Same for 96-99 1.5L SOHC & DOHC and 97-02 2.0L





Can someone make this sticky and UN Sticky the INCORRECT info!!!!!!!

[Edited by spikie on Jan 3, 2006 1:56 PM]

[Edited by spikie on Jan 3, 2006 1:58 PM]

[Edited by spikie on Jan 3, 2006 1:59 PM]

05 Durango SLT Adventurer 5.7 HEMI - yeah it's got a HEMI (15.440 @ 88.79mph Bone Stock)

97 Accent GT (2.0L Sleeper) Still Parked for winter as of 29/06/07!
2.0L Beta Engine w/ I/H/E, Plugs, Wires, Msd Dis-2, Lightweight Flywheel, Ported IM, Cutsom moddified 65mm BBTB, Strut Bar, Front Tib Brake Upgrade
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post #2 of 33 Old 01-03-2006, 05:32 PM
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Re: How use a BETA ecu on your 1.5L Wire Harness without REWIRING

No you have it wrong. Look at my post here : https://www.hyundaiperformance.com/forums/topic.php?t=70675

The last list of pins I put on there are for the 98 accent and from th e 01 Tiburon. Those are all the same. The 95-97 accent ecus are different from the 98,99 I thought. Perhaps the 97 is (late model?) is the same as the 98-99... Also my sohc 1.5 does have a canister close valve and a fuel tank pressure sensor so does the 01 tib according to webtech!! My comparisons are also both from manual trans. If you compare your diagram (I dont have time to right now) with my list of pins from a 01 tib and a 98 accent and they are the same then the 97 may have the same ecu but I dont think they do or it would have been discovered when drerob wired up some harnesses for tha tyr accent. He said he had not done one with the 98,99 or something. Also they are not exactly the same, the 02 sensor signal and ground are reverse for BOTH o2 sensor. Compare yours with what was found on mine to see if the 97 has the same as the 98-99 though It may be a late model 97 and not early model that is the same....

scoupe pistons/shotpeened rods,tib TB/maf/ecu,UD crankpulley,rebalanced crank,p&p head(I/E side),removed PS/ac,t3 super 60 turbo,fmic,hks ssqv bov,emanage,innovate wideband (xd-1 gauge),apexi boost gauge,440cc ford injectors,malpassi rrfpr
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post #3 of 33 Old 01-03-2006, 06:08 PM
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Re: How use a BETA ecu on your 1.5L Wire Harness without REWIRING

see that what i said all the guys with x3 here in quebec have don ther sawp with out rREWIRING they put in the beta motor and ecm with he 1.5L Wire Harness, you can also use the 1.5 dohc ecm but 2.0 is you best bet!!

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I posted this to show anybody how much potential we have with hyundais, wether they are turbo, N/A or otherwise we can do anything we put our minds to, people are out there doing it as we speak, the people mentioned above are a few of them.
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post #4 of 33 Old 01-03-2006, 06:10 PM
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Re: How use a BETA ecu on your 1.5L Wire Harness without REWIRING

From what I understand as long as its a late model 97 and any 98 99 accent then yes you can drop it right in and swap the 2 o2 sensors signal and ground wires under the hood and your good to go. Im almost positive the 95,96 and early 97 have different ecu harness setups that that of the later models I listed above....

scoupe pistons/shotpeened rods,tib TB/maf/ecu,UD crankpulley,rebalanced crank,p&p head(I/E side),removed PS/ac,t3 super 60 turbo,fmic,hks ssqv bov,emanage,innovate wideband (xd-1 gauge),apexi boost gauge,440cc ford injectors,malpassi rrfpr
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post #5 of 33 Old 01-03-2006, 08:08 PM
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Re: How use a BETA ecu on your 1.5L Wire Harness without REWIRING

So as long as you use a Beta ECU and rewire those O2 sensors, everything should run fine with no CEL? Interesting... I'm guessing all the plugs underneath the hood are the same, too.

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post #6 of 33 Old 01-03-2006, 08:40 PM Thread Starter
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Re: How use a BETA ecu on your 1.5L Wire Harness without REWIRING

Yeah i can't say for the 98-99 accent for sure as this is going by the 97 Hyundai Accent Shop manuals... so either for for sure on the 96-97 accent the wiring pinout for the tib ecu is identical... I finally got around to having time to do it and it runs beautiful... Started up wicked, no more CEL right off the bat.. With the 1.5L DOHC engine my idle sat around 1600rpm and i couldn't find any way of bringing that down... now with the 2.0L ecu it sits nicly at 900rpm.. havn't taken it on the road to see if there is any difference and that won't happen till all the snow is melted....

05 Durango SLT Adventurer 5.7 HEMI - yeah it's got a HEMI (15.440 @ 88.79mph Bone Stock)

97 Accent GT (2.0L Sleeper) Still Parked for winter as of 29/06/07!
2.0L Beta Engine w/ I/H/E, Plugs, Wires, Msd Dis-2, Lightweight Flywheel, Ported IM, Cutsom moddified 65mm BBTB, Strut Bar, Front Tib Brake Upgrade
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post #7 of 33 Old 01-03-2006, 09:15 PM
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Re: How use a BETA ecu on your 1.5L Wire Harness without REWIRING

You have a late model 97? I think the 96 ecu maybe different.... You just plugged it in and was good to go? Should be the same on the 98-99 except the 02 sensor wires need to be switched... Must of been the same on the 97 meaning its not the same for the 98-99..... The only difference would of been the o2 sensors. I dont understand what all the rewiring was for on the beta swaps in the x3s then....

scoupe pistons/shotpeened rods,tib TB/maf/ecu,UD crankpulley,rebalanced crank,p&p head(I/E side),removed PS/ac,t3 super 60 turbo,fmic,hks ssqv bov,emanage,innovate wideband (xd-1 gauge),apexi boost gauge,440cc ford injectors,malpassi rrfpr
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post #8 of 33 Old 01-03-2006, 10:21 PM
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Re: How use a BETA ecu on your 1.5L Wire Harness without REWIRING

From what I had understood on these forums and other ones on the net the beta swaps into the 98-99 accent by dropping the motor and tranny in there, hooking it up to the stock harness, and hooking up the beta ecu to the stock harness. Now it's being said that the same can be done for the 96-97, is this true for either, some of you are saying that there is some wiring to do, this is by far the easiest swap I've ever seen on any car(other than making the engine mounts work). I think this post should be made into a sticky so that hopefully this can be sorted out and made official here. Beta swapped Accents are the foundation for all hyundai swaps that could be possible in the future, by mastering them we'll be more capable of figuring out new stuff.
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post #9 of 33 Old 01-03-2006, 10:29 PM
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Re: How use a BETA ecu on your 1.5L Wire Harness without REWIRING

I cant say for sure about 95,96 but he just said he plugged the beta ecu in his 97 and went with it =-) According to webtech on the 98,99 accents you could just plug it right it and reverse the 02 sensor wires (ground and signal should be reversed) for both o2 sensors and go ;-)

scoupe pistons/shotpeened rods,tib TB/maf/ecu,UD crankpulley,rebalanced crank,p&p head(I/E side),removed PS/ac,t3 super 60 turbo,fmic,hks ssqv bov,emanage,innovate wideband (xd-1 gauge),apexi boost gauge,440cc ford injectors,malpassi rrfpr
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post #10 of 33 Old 01-03-2006, 10:56 PM
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Re: How use a BETA ecu on your 1.5L Wire Harness without REWIRING

The only difference between SOHC (1.5L) & DOHC (2.0L or 1.5L) is that the sohc engine does not have

PIN 18 - Canister Close Valve (2.0L & 1.5L DOHC)
PIN 76 - Fuel Tank Pressure sensor (2.0L & 1.5L DOHC)

is what spikie says for the 97, and the 98-99 is as straight forward as what you just said^^, do you know of anyone who knows more about the 95-96, from what I've understood in the past they share similarities to the x2, scoupe, excel because they are prior to the tibs & elantras, once the tib & elantra were introduced hyundai made the accent more similar to those. I think I'll go do some research in the accent,scoupe, excel section it might give us some answers.
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