*Urgent* STI ECU numbers - how to tell its an STi V5/6 ECU??

[gazzy2000]

here are somd Pics of the ECU board, can anyone shed some light on the ECU please? i.e. STI or non STI, factory boost etce

Much appreciated

[log1call]

The blue colour of the connectors is important. Have a look in wiring diagrams and see if they have different coloured connectors.

[gazzy2000]

Well my BH5 GT-B has blue, black and grey as per wiring diagram and what is physically on the car, i know the v5 STI wiring diagram states that the plugs are blue, grey and black also but as for the plugs on the car this ECU came off..... i do not know

[log1call]

The car's plugs are always the same colour as the ecu's socket. The colour is an identifying feature.

[gazzy2000]

 log1call said:

The car's plugs are always the same colour as the ecu's socket. The colour is an identifying feature.

yea, i think you are thinking of earlier ECUs, i.e. my TT ECU is straight grey on the ECU but has colored plugs on the loom.

[gazzy2000]

Are there any kind folks out there in subaru land with a V5/6 STI keen to whip your ECU out and take a pic of the case numbers and the numbers/chips on the board?

I would be very appreciative if someone could ;D

Cheers

Gary

[Guest]

That PCB number (A19-001 DS2 (N) reflex v5/v6 sti they use this board on many cars in the Subaru range Forester included,

However the CPU number reflex V4 /v5 STI so you have a 3 plug V5 STI Ecu, and at a guess late 1998 release not 99 so would be V4 STI 3 plug Ecu, but hey just guessing on that last comment

[QRAF]

my nz new ran 14.7psi on the factory turbo and 9psi off the wastegate.

but mines only a wrx

[kamineko]

 WiLd02StI said:

That PCB number (A19-001 DS2 (N) reflex v5/v6 sti they use this board on many cars in the Subaru range Forester included,

However the CPU number reflex V4 /v5 STI so you have a 3 plug V5 STI Ecu, and at a guess late 1998 release not 99 so would be V4 STI 3 plug Ecu, but hey just guessing on that last comment

interesting comments, looks like they use the same board for single/twin turbo engines of that vintage. defiantly V5/V6 though.

cpu number most likely wont differ by engine, its just a processor.

in my opinion it might be impossible to tell what tune its running just by looking at the hardware. anyone recognise the C2 stamped on the socket? does that have any relevance? small stickers in the same place on earlier ecu's are model/tune relevant

i vote hooking it up to a diag/ssm/obd2 and asking it what version tune its running - ask log1call

[Guest]

interesting comments, looks like they use the same board for single/twin turbo engines of that vintage. defiantly V5/V6 though.

Yes same boards BUT different processors from different processor families. It’s the last four digits that make what it is, year releases and so on you will find that it will have different firmware for the CPU and voltage and this really could go on. But that’s just what I’ve heard and talked about... I could possibly be wrong

[gazzy2000]

Caspro has sent his ECU to me today, shud be here tomorrow, will post results

[gazzy2000]

OK, fitted Caspros ECU, did it all properly i.e used static precautions and disconnected the battery first.

Went for a drive, car was cold so took it easy, when the car was half warm i boosted a bit just to see, and it looked good boosting past 12.

So i continued driving to warm the car up, once warm i started driving up a bit of hill and put my foot down it started boosting past 15 PSI, i thought "nice" but then it did a big hestitation and slipped back to 10 PSI and wouldnt go above 10 again!

That was with the Map sensor plugged in, i jumped out and blocked the hose to the MAP and tried again, no go, just the same!

There are no CELs.

I am a wee bit stumped here!

[Guest]

but then it did a big hestitation and slipped back to 10 PSI and wouldnt go above 10 again!

sounds like the ecu must be limiting the car, just an assumbstion(sp?) reset the ecu, then try again without the MAP sensor in there?

-smurff

[gazzy2000]

Yip OK, will try in do that at lunch.

Now to reset the V5/6 ECU its both plugs plugged in under dash, but do you have to do the whole throttle full down, then back to half for 3 secs then go for the drive over 11KM but under 40KM?

[Guest]

yea, think you will have to do the whole procedure, cant remember what its was, but you sound right

for that you will have to remember to plum the map sensor back in aswell i think

once thats done, un plum the map sensor and give it a try

-smurff

[gazzy2000]

 smurff said:

yea, think you will have to do the whole procedure, cant remember what its was, but you sound right

for that you will have to remember to plum the map sensor back in aswell i think

once thats done, un plum the map sensor and give it a try

-smurff

Yip will do

Heres the procedure http://www.scoobypedia.co.uk/index.php/Knowledge/ECUReset dunno if that accelerator thing is necessary aye, wil do it anywho!

[Guest]

may as well follow the lot, save doing it twice if it dont work coz you didnt do the lot

-smurff

[gazzy2000]

right, reset ECU with Map all plumbed etc, stopped and unplumbed the MAP, on the drive after the reset the first 2 boosts were standard 10 PSI then it boosted to 15 and cut out/hestiated and back to 10 PSI we go.

Sumfink is telling teh ECU to go into limp boost mode! i did find a differential boost sensor on the firwall left over from the TT setup, it was still plugged in. I unplugged that and reset teh ECU again and tried again, no go. I checked on line and that sensor is mainly for the exhaust solonoid etc on teh TT's, the STI ECU wont even care about that noid anyways.

??? ??? ??? ??? ???

[Guest]

you unpluged the differential boost sensor by electrically unplugging it?

-smurff

[Guest]

can you recheak your pinout diagrams against each ecu, in regards to making sure all the inputs are correct.

Im trying to have teh best think about this as i can for you

-smurff

[gazzy2000]

 smurff said:

you unpluged the differential boost sensor by electrically unplugging it?

-smurff

yea, and i have long sinse snipped the hoses, no CELs either

[Guest]

 gazzy2000']

[quote name='smurff said:

you unpluged the differential boost sensor by electrically unplugging it?

-smurff

/quote]

yea, and i have long sinse snipped the hoses, no CELs either

yep, thats kewl

-smurff

[gazzy2000]

 smurff said:

can you recheak your pinout diagrams against each ecu, in regards to making sure all the inputs are correct.

Im trying to have teh best think about this as i can for you

-smurff

yea, i am going to have to i think, i know Reuben went through them with a find tooth comb too when he did chris's BH TT to singel T conversion

[Guest]

theres only gunna be a handfull that could be causing this if there is a missmatch, i suggest double cheaking against both, then even cheaking any work done for a hickup

what car have you got it in?

-smurff

[gazzy2000]

 smurff said:

theres only gunna be a handfull that could be causing this if there is a missmatch, i suggest double cheaking against both, then even cheaking any work done for a hickup

what car have you got it in?

-smurff

The rude thing is that Reuben put a STI ECU V6 into big Daves Foz and that did the same thing, no wiring changes no nothing just straight in, he had no mods either! wudnt boost past 10 PSI

WWWTTTFFFF! :-\