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Atessa Computer Gts4 Or Gtr?

WYTSKY
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WYTSKY Veteran

WYTSKY

Posted
Posted

Hey guys,

I have a question regarding the atessa 4WD computer,

A cuple of weeks ago an old lady went up the back of me, didn't do much damage to me, just a broken rear bumper... little bits...

then about a week later I was just driving normally when my abs and 4WD light came on, don't know why, feel as though it was related to the crash.... now, every 2 days or less I will be doing nothing out of the ordinary and the warning lights will just come on... I pull over, wait for 5 minutes, turn on the car again and it seems to be fine for a little while.

My tuners believe it has something to do with the computer, not the reservoir in the boot, because I checked it and it is appears fine, so I am looking for a new computer...(IF YOU GUYS HAVE ANY OTHER EXPERIENCES WITH THIS PLEASE POST) however, it is extremely hard to find a gts4 atessa computer, instead a GTR's one is easier to find, but I know they have their differences, for eg. the GTR has an atessa pro system running and a gts4 has just got an atessa...

Will it make a difference if I used a GTR one?

Thanks for your time.

Adam

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paulr33 Grand Master

paulr33

Posted
Posted

the 4wd / attessa system copies a few signals from the main ecu and they get relayed to the ECU in the boot

so passenger foot weel = main car ecu

boot under parcel shelf = 4wd / abs / active lsd computer

the main signals are speed, rpm and TPS

TPS is probably the main one as at car bootup if TPS is not present (to the 4wd computer) it will fail and give up

also if TPS goes out of whack at runtime then it will give up the ghost. check and trace the TPS wire or make sure your TPS wire at the 4wd computer has voltage at idle should be around 0.33v ish give or take.

WYTSKY Veteran

WYTSKY

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Posted

Thanks for the help, but I have a few questions...

what does TPS stand for and what does it do?

when you said "goes out of whack at runtime then it will give up the ghost. " you did mean while driving yeh? because it doesn't come on straight away when I turn on the car.. could take an hour.. a day...

one thing that is strange though... whenever the abs system and 4wd system fail I can tell without even looking at the warning lights in the dash cluster because I feel it in the brake, feels like a lil lump for a second...

finally, if I got out a multimeter and checked to see voltage... what color would the wire be and Im assuming I would have to check when the warning lights come on?

OH.. one final thing... it may be related, but i'm not sure, I have one of those atessa controller things where you can set how much distribution of power to front or rear... I have never touched it in the past few weeks... (been too bloody dry to need it) ... could this have something to do with it?

Thanks again for the help,

Adam

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