TT and 7AT P0744
 

I searched online and this forum and couldn't find anyone with this trouble code on a 370z.

P0744: Torque Converter Clutch Circuit Intermittent

It seems to be either low fluid or a bad solenoid.


Anyone with any experience on this?

I am a SC'D 7at and no problems no far. Is the car driving any differently. Also how many miles on your build?

About 3000 miles. I have GTM HD Tranny cooler.

The car shifts wierd from 3 to 4. No clunking noise or anything just revs up on its own before shifting from 3 to 4.

Found this video of the same symptom on an Altima.

http://www.youtube.com/watch?v=sgX7AYkKias


Notice in the video at :12. Thats what my 3-4 shift does. Started doing it recently.

Does SAM have any thoughts?

The shift from 3rd to 4th may be normal. Search for flare in the g37 forum.

Will do.

Haven't contacted him yet. That may be my next step in figuring this out.

How is you trans cooler mounted ? Is it upside down ?

Sam

God I hope not.:shakes head:

No its not because the problem started recently.

Having the trans cooler mounted upside down is not a problem. But when you do , It will cause the fluid to drain back to the trans and that will give you a faulty indication of the fluid level in the trans, The system is not that big and all it takes is a half a quart low on fluid for the trans to act up .

Sam

Thanks Sam!

was it upside down??

Im checking it today.

I don't think it is though.

no its not mount upside down.

we had this problem with 3 cars here in Germany - everytime it was the fluid level not being 100% accurate.

Check it and you will find that you miss a few ounces - in my car the tranny behaved very weird (revving up to rpm cut before shifting when in manual mode on the track). And I only missed like 6.7oz !

The 7AT seems to be very very fussy as is the whole car e.g. when it comes to brake fluid. I once missed like less than 0.5inch from the top mark at the reservoir and my trac and abs light came on.

So be careful to always fill every fluid up to the max / optimum mark.

Chris

^^^ hmm. good to know.

My car has shift flare every now and then, on 3 to 4 and sometimes 4-5 shifts.. Feels like its slipping but I have never had a code, Its been doing it off and on for about a month,

Update: Car won't shift out of 3rd and 4th.

Problem disappears after car sits for awhile. Taking to dealer tomorrow. :(

Not that's something I don't want to hear:shakes head:. My car (7AT) does the same thing when everything is cold. I will get an uprev from 3rd to 4th. It will still shift from 3rd to 4th, though. It only does until everything gets warm. After that I have zero issues.
I just got a new tune today for the tranny:stirthepot: and I can already tell the diffrence when it shifts. Now that might be another story when I drive it in the morning.
Do you get a clunking noise when you let the car down shift into 2nd? Mine doesn't do it all the time but it's the opposite. It only does it when the car is warm.

When you use the term 'uprev', although it's specific to shifting, it's misleading to the tuning company. In another thread I had NO idea what you meant. Now I see you are talking abut a slight RPM increase?

Got it. I like the term RPM flare.

Coop

Well problem appears to fixed with the "rpm flare":tiphat:. To be honest it was UpRev/STS who helped fix the issue.:tup:

Jason(Jnaut) who installed the TT and Jack from HP Logic said there was no way to do anything to help with the shifts on a 7AT through Uprev. I knew they were incorrect.

They refused to listen to me. They were very wrong.

On top of that HP Logic charged me $380 for a 20 minute retune.:eek:

Car is at Nissan now. :shakes head:

It is just increased transmission line pressure.. not really a "tune" it is very straight forward but effective.. Im assuming when they hear tune they think changing shift points and all that stuff

Wow they charged you to fix their problem? That's not standing behind your product or the guys doing the tune.
Damn that sucks. I would call Uprev and ask them. I always hate it when someone says there is no way to fix something. It just tells me that they have thrown their hands up and said I QUIT! No thanks...there is always a fix for a problem. Good luck and hope it doesn't cost a small fortune for you.

Well as a certified Uprev tuner I would think they would know what I meant or at the very least ask for clarification.

Lets see what happens...

I am currently in process of looking for a new tuner. I went to closest option and got burned. I know I am not the only one on the forum who got burned by them.

It is what it is.

Same thing here with the tuner I went to have my system installed. Guess I should of looked at his shop a little closer and seen that the only thing in his shop was mustangs and other domestics.

I don't know the specifics, but from what I've learned there is not a simple 'line pressure' increase through the Uprev software. (5AT experience).

You have a set of complicated numerical tables under the Torque Management window and they have to be tailored to the shift points and HP.

My own trans is awaiting a new TM set of numbers. Pat (Level Ten) just explained to me this morning that line pressure alone will not do what we need.

Someone with more experience than me can correct me.

Coop

+100 for wha Coop said, My tuner( kaizen) Just tuner my car last Saturday and had to change all the TQ managment tables with UPREV.. What did the dealer say, Being FI I'm sure they are not warrentying the car, Or are they??

Coop the Subi guy at Kaizen says Hello, :) We where talking about your car when my car was on the dyno.

Nissan told me the same thing. They will not touch a thing on my car because I FI my Z. They will however still change the oil but as far as issues. It's my problem now.

Dang WoW sorry to hear all this. Glad I found out though because that is where I had planned on taking my car if/when the FI comes. If I do anything other then S&R's kit I guess I will be trailering the car to Z1.

Im glad you read my experience.

I might be parting car out soon.



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Ahh that sucks sorry to hear your bad experiences.. everytime I rear about going FI route I'm like ya sounds good , then you read about the bad experiences some members have had and it steers you the other direction. It does seem the majority of problems are coming with the autos but none the less goodluck!

Aww man sorry about everything. I just used HP Logic recently and I'm loving my uprev but I also am not FI just good old bolt on's :P good luck!

guess i'm pretty damn lucky! they just warrantied my timing sprocket gasket cover this morning and no questions asked lol.

What did they say was wrong?

I had the whole shop under my car with flashlights looking at my set up:tiphat:. That's when I asked if any of my parts were covered. At the same time they have to prove it was due to the FI in order in deny the claim. I guess if I ever blow the damn thing up I can simply rip out the system real quick and put it back to stock and take to a diffrent nissan dealer:tup:

it was leaking oil from the timing sprocket cover, they knew i was F.I'ed and no issues getting some parts warrantied but i'm pretty sure they will not cover the engine if that ever blows.

Ill find out soon whats the verdict with the tranny.

In baltimore for business so lets see what happens.:confused:

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Hmm that blows dude. You have a clean ride to! This just steers me way from ever doing any sort of FI on an auto tranny.

Warrantys for scardy cats any way