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R32 Gtr 4wd Light Comes On At Times

eddiem

By eddiem,
in Drivetrain and transmission

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eddiem Collaborator

eddiem

Posted
Posted

hey all im having some issues with my gtr r32 i get the 4wd light come on if i start the car and let it warm up but if i start the car and drive straight away it all works

any ideas?

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Gareth
Gareth

I didn't have any errors, but i replaced my canister and it totally changed the behaviour of the system during bleeding. I got mine from rhdjapan (few months ago) it was about $280. My pump was sta

CRZY32
CRZY32

Yes my 4WD is working like a dream now. Fitted the new nitrogen canister and bought a digital G-sensor to replace the old original sensor... Car hooks up all four wheels almost instantly on the track!

Gav Mentor

Gav

Posted
Posted
hey all im having some issues with my gtr r32 i get the 4wd light come on if i start the car and let it warm up but if i start the car and drive straight away it all works

any ideas?

Check the ATTESSA computer in the boot for error codes (do a search here or refer to the manual for how to do this).

My bet is error code 18

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jonnyo Collaborator

jonnyo

Posted
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Check the ATTESSA computer in the boot for error codes (do a search here or refer to the manual for how to do this).

My bet is error code 18

Long time later to revive the thread but what is the fix for error code 18?

I changed the Attessa pressure switch (pain in the backside job) and still had the light come on and no 4wd?

Cheers

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GTR_JOEY Grand Master

GTR_JOEY

Posted
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Anymore info on this?

ive had a few issues the last couple of days and im getting error code 18

18 – ETS pressure switch or circuit

is it generally the switch that is faulty or can it be dodgy wiring, im guessing it could be either or...

its a bit of an intemidant fault atm, generally when i start it up cold its good to go, but if i stop then try to start it up again it generally comes on

from quick research the switch is above the final drive

this has only started to happen since a removed the engine and did a few mods while it was out.. i also pulled out all the solenoids in the Hicas system though surely that isnt the problem

i havent disconnected any off the ATTESSA LINES so im assuming its all bled and ready to go, I "assume" but i will do a bleed anyway.. just looking for peoples experiences with this

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GTR_JOEY Grand Master

GTR_JOEY

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After some more research ive found the its usually the pressure switch thats at fault and generally the pump needs to be replaced :/

Its a pretty big job from what ive been reading from, i just find it very odd that its all of a sudden happened now after i done all these mods

Righto so after closer inspection there seems to be some oil leaking on the rear diff.. it doesnt actually look like its coming from the rear diff as there oil all over the top bushes... im guessing there is a small leak in the pressure switch or there abouts

really need to get the car up in the air for a proper inspection..

the fluid level has also dropped in the reservoir so thats really a dead give away that theres a leak somewhere...

will report back on closer inspection

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GTR_JOEY Grand Master

GTR_JOEY

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Ok so there was the tiniest leak coming from the nipple below the pump so I have it a tighten..

Also noticed a large build up of gunk on the rear right hand abs/wheels speed sensor on the drive shaft.. Gave it a good clean and now the trouble has seemed to did appear..

What that has to do with error 18 "ETS pressure switch or circuit" I have no idea

Will give it another couple of days before I claim victory

Haven't bled it yet

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GTSBoy Grand Master

GTSBoy

Posted
Posted

It might have been causing the ATTESSA system to do something in response to the strange wheel speed signal (don't even know if this can occur) and the consequent unusual operating condition of the ATTESSA system caused high or low or whatever wrong pressure - enough to cause code 18.

/wild theory.

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GTR_JOEY Grand Master

GTR_JOEY

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Hmmm our theories just went out the window :(

It seems to be that initial priming of the ATTESSA is determining weather or not the 4wd is going to work or not

If I start the car up and and it doesn't and the 4wd light doesn't come on within the first 5 seconds it won't come on at all..

The fault is very tempremental so I'm considering looking for another switch as it seems the most Likely cause atm... This would appear obviouse considering the fault code but I've read many threads where people have replace the switch with a known working one and still had the fault lol

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GTR_JOEY Grand Master

GTR_JOEY

Posted
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Ok found a workshop manual,

As per the fault diagnostic ice checked PIN number 42 for ground at the back of the ATTESSA ECU

There was ground there so tomorrow I will need to get under the car to check PIN number 3 and 4 for earth at the ETS hydraulic unit plug

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GTR_JOEY Grand Master

GTR_JOEY

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Have it a mega good bleed today.. Issue is still there.. Also checked the 4 pin plug that goes to the switch.. Looks pretty clean

Check the earths at pin 42 and 4 as designated by the workshop manual fault chart..

Everything so far as been pointing towards "ETS hydraulic unit is faulty"

Looks like it pretty much a diff out job atm

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