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R32 Gts4 Microtech / Wiring Issue

55yko

By 55yko,
in Engines & Forced Induction

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55yko Collaborator

55yko

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I recently put a microtech in my r32 gts-4, the car is all finished and up and running, but the 4wd system isnt working. It has the 3 lights on 4wd, hi-cas, and anti-lock. its the same as if you pulled the 4wd fuse in a gtr (yes i checked the fuse - and its fine)

can anyone point me in the right direction? has wiring diagrams? or can give me a hand(brisbane- northside)?

Cheers

55yko

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unique1 Mentor

unique1

Posted
Posted
I recently put a microtech in my r32 gts-4, the car is all finished and up and running, but the 4wd system isnt working. It has the 3 lights on 4wd, hi-cas, and anti-lock. its the same as if you pulled the 4wd fuse in a gtr (yes i checked the fuse - and its fine)

can anyone point me in the right direction? has wiring diagrams? or can give me a hand(brisbane- northside)?

Cheers

55yko

u need to hook the tps signal wire from the attessa ecu upto the tps signal on the ecu (tee in the wire), i dont know what wire is the one as i dont have a gtr but it will be in the front near the ecu and coming from a big plug that runs to the rear of the car, im sure someone on here will have the colour or a diagram to help :D

55yko Collaborator

55yko

Posted
  • Author
Posted
u need to hook the tps signal wire from the attessa ecu upto the tps signal on the ecu (tee in the wire), i dont know what wire is the one as i dont have a gtr but it will be in the front near the ecu and coming from a big plug that runs to the rear of the car, im sure someone on here will have the colour or a diagram to help :D

I totally rewired the TPS for the microtech. so i assume then i need to run a wire from the tps to the attessa computer?

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
I totally rewired the TPS for the microtech. so i assume then i need to run a wire from the tps to the attessa computer?

yes but you need a buffer circuit as the tps signal to the Microguess will be affected by the ATTESSA i have had something designed and built to compensate this probelm.

55yko Collaborator

55yko

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Posted (edited)
yes but you need a buffer circuit as the tps signal to the Microguess will be affected by the ATTESSA i have had something designed and built to compensate this probelm.

Microguess is right :laugh:, do you know what "specifications" each circuit needs to be so i can get a similar unit made up? Cheers for your help

or does anyone know where i can get a "premade" one?

Edited by 55yko
bozodos Grand Master

bozodos

Posted
Posted

Ok I have the EXACT same problem with a Microtech LT10S running a RB25DET (also the VCT is unplugged and microtech tech support were quite unhelpful on how I go about enabling it, or whether the ECU comes with the bit needed for it) I'd also be looking at some way to run just the Microtech with ATTESSA - It's got plugs on the loom to piggyback the standard GTS4 ECU, but then I'd have to sit it on the passenger side floor :S

I don't have the ABS light coming on though so I assume that works, and I have a HICAS lock bar (light only comes on occasionally when driving at 110km/h on freeways)

unique1 Mentor

unique1

Posted
Posted
yes but you need a buffer circuit as the tps signal to the Microguess will be affected by the ATTESSA i have had something designed and built to compensate this probelm.

mine seems fine so far just hooked straight upto my autronic tps signal, what signs does it show if its not correct?

fletch rb30 Enthusiast

fletch rb30

Posted
Posted

The attesa ecu needs to recieve 0-3.5v signal for the tps signal, the stock ecu outputs this signal from the 0-5v signal coming from the tps.

I have a link ecu and the voltage coming from the tps is 0.2-3.7v which is pretty close so i just hooked it up and it works fine.

Link use an op-amp with 0.7 gain to modify the signal in their plug in ecu's. You could get somebody to make you one for a case perhaps

If you have a 0-5v tps signal straight onto the attesa ecu, the ecu will think you have 100% throttle when your at 70% which is not really a bad thing, it will bring the 4wd on earlier :P

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
good info, so whats needed exactly to fix this, i have found a fair bit of understeer when going hard into corners as if 4wd is coming on too early, but not sure if thats normal or not

i have a fix for this

nizmonut Community Regular

nizmonut

Posted
Posted
does anyone have a wiring diagram for a gts-4 by any chance (engine and attessa would be nice :D )?

engine diagrams are identical gtst/4 the see this thread, contact the member for a copy of the manual on cd.

fletch rb30 Enthusiast

fletch rb30

Posted
Posted

you need to download the gtr wiring diagrams. i dont have them on me anymore, but on the biggest diagram, the plus is in the bottom left, i think its called wc3. you have to blow up the pics and print them out on a3 and you can nearly read thw colours, but you can follow the lines from the plug to the end of the wire.

There is a page just for the attesa/abs ecu, you can use a multi meter on the correct pin on the ecu and a long wire back to the cabin to find the correct wire.

unique1 Mentor

unique1

Posted
Posted
i have a fix for this

i noticed that in your first post, hence i asked what exactly do i do or what do i need to buy or what do u want to sell me? :D

and a price would be good if u have got something for sale to fix it. I would like this asap as i have a track day soon and understeer sucks.

55yko Collaborator

55yko

Posted
  • Author
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ok update, what i need is the attessa pin out, im going to run a wire from the microtech tps 0-5v wire.

I just looked to see whether the attessa was spitting out any error codes and the led was not flashing at all. made me think because if it was TPS it would be throwing code 21 shouldn't it?

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