Electronics help with TPS circuit.

[BMWTurbo]

Cambelt, I used to do it in 1st... I found you could drive along at 4000rpm and nail it and would be hitting the limiter thing by a bit over 5000rpm.

I have a feeling it's something to do with the traction feed/talknig to the TRC ecu also, but was buggered if I was gonig to rewire/integrate that

93 JZS147... From all accounts should have the exact Aristo ECU I was using.

I did build a circuit to 'get around' the issue that works well.. Though it was a bit of a muck around to get it right and I don't really have a circuit diagram of it as it ended up being done on the fly.


I'll be removing this very soon as the Supra ECU has fixed the issue... Though as you mentioned in the other thread I'm not 100% certain that the manual/ECT works correctly as I don't even bother driving in 'norm'.

[cambelt]

The supra still talks with its TRC ecu but maybe doesnt get upset by not having it there .
We still only have one account of a standard aristo doing this rev limit .
Dave

[cambelt]

Hello
Ive since done a bit more on this rev limit topic . Ive hooked a aristo 2jz into a mx 83 and have every efi sensor hooked up bar the TRC ecu , yes even cat temp and fuel pump ecu .
The only code i have coming up is 87 , i cant find the exact term of 87 but id guess it to be TRC comms as the jza 80 2j is simmiler .
On test driving the vehicle it does the rev limit thing but also i can feel the auto doesnt like the full throttle gear change , it changes but not 100% happy , at 3/4 and under throttle its perfect.
Another thing ive found is the 2jz-gte needs the trc ecu hooked up to prolong the life of the auto , the reason being is on flat throttle upshift the engine ecu sends a signal to the trc ecu to close the sub throttle acctuator on gear changes hence dropping the power output of the engine during the gear change .
I dont know but maybe the trc sends back a signal to the efi ecu to retard the timing like a 1jz does .
This job is done and i wont have any more time to spend on it for while but hopefully there maybe one of us who can spend some time looking at some of the trc signals , maybe somone with a complete aristo or jza 80 supra .
Most probally wont bother but im a perfectionist and will get it right in time .
Dave

[Mos]

Another thing ive found is the 2jz-gte needs the trc ecu hooked up to prolong the life of the auto , the reason being is on flat throttle upshift the engine ecu sends a signal to the trc ecu to close the sub throttle acctuator on gear changes hence dropping the power output of the engine during the gear change.

Hey that's interesting - every toyota with an electronic throttle does that - backs off the throttle slightly on gear changes. It makes gear changes almost completely smooth, even at full pelt.
Never would have thought they would've done it with TRC but it makes complete sense.

Mos.

[BMWTurbo]

Great info Dave...

I've since changed auto's again.. and now have what I'd call a 'good' Auto fitted, it seems the other's I've had have been stuffed or on thier way out.

This auto has shifted nice and early from fitment and it doesn't engage slowly then bite like my others have done.

Of note is that I've used Dex III in this auto not Type IV, I don't know if this has anything to do with it or not.

I've also just fitted an MV 1.5shift kit and now the box grabs the next gear very quickly and positively. I'd recommend this to anyone who can live with the harsher gear changes, even on light throttle.


I am getting Code 89, but I can't find any reference to code 87 for the A340e? I'd attach the PDF I have but it's too large and I've lost hte link I DL'd it from since.

EDIT: - Try this...

http://www.wjw.co.uk/Toyota/95%20Sup...%202JZ-GTE.pdf

[cambelt]

It would be nice to a simple trc ecu to wire up instead of the huge supra or aristo one , its nearly as big as the efi ecu .
Dave

[cambelt]

I wonder if the 1J,s in the soarer,s have the same rev limit with or without TRC , ive got a customer without TRC and it farts hard on change.
Im now looking to build a circuit that can ign cut say 2 or 3 cyl on gear change .
I really love that noise the 1j,s make and would like to see it on the 2J.
Dave

[BMWTurbo]

Dave I'll be rigging a multimeter up to a stock aristo TRC TPS sometime soon to see if it does move the butterfly on gearchanges.

On a side Note the Stock aristo 'farts' on gear changes also I can't stand it personally Fit a shift kit and jsut keep spinning through second

[cambelt]

Well i think we can be sure that aristo 2j,s have the fart retard meaning the trc ecu must deffinatly send a signal back to the efi ecu for this to happen . I wonder if a supra does this ?
Dave

[BMWTurbo]

I haven't noticed any 'fart' with the Supra ECU. But I haven't cross-referenced this with the Aristo ECU so I can't say for certain the shift kit isn't stopping the 'farting' and I didn't gas the car with the shift kit not fitted due to stressing about hurting the box...

[Esteban]

I'm trying to organise a supra ECU for my aristo, so if that ever happens, I'll update you on the farting...

[cambelt]

My customers TT jza 80 is auto but i dont think it farts ,can anyone with a supra confirm this .
Dave

[BMWTurbo]

I believe your A/C won't work with the Supra ECU in the Aristo.

I removed my 'fix' circuit from the TPS on the weekend, no adverse effects with the Supra ECU now

[MR 1JZ]

yeah Aristo AC doesnt work with supra ECU...i discovered this on the hottest weekend in adelaide all year...and it was the 3 days I was without an aristo ecu...

[PlacentaJuan]

/me runs.....

funny how an ecu runs on electricity but doesn't like sparks and stuff hey? zzap!