[amc49]

The stepper motor has nothing to do with pump output which cannot be blocked other than by a pressure regulator. The stepper actually controls the spread of the primary pulley halves to change the effective gear ratio as needed. It is basically the shift control there.

Worn fluid still makes pressure, it is still a liquid and non-compressible, and if low in level the trans will immediately slip, generally when turning sharp corners first.

All OEMs will have good part numbers that may not be found in the normal parts books, they have to have a way to identify anything they make. Like so-called race parts used in competition but not listed for the general public. Many of the specialty tech tools are the same way. I used to do the same thing at Ford with researching unobtanium parts to have them show up to befuddle the parts guys.

I've fixed normal type ATX transmissions with the use of as little as a 30 cent washer before when the shops all claimed I needed a new transmission. So much for skills there. I fixed my Focus of heavy 3-4 slip by making up a bolt into an oldschool band adjustment to make up for one not being on the trans, car runs fine now years after that. Again, told to get a new trans.

Nissan CAN get parts but they have decided it makes far more money to simply change them out. The fact that they have to pay somebody more to be able to diagnose and fix right the FIRST time figures into that too, the skills are quickly becoming lost even on these super simple CVT. Never mind they don't want to pay somebody to know that to begin with, it takes money away from the CEO and we can't have that at all.

 

[amc49]

'...they are programed to sell transmissions only and none of the parts for them.'

It took you long enough to figure that out...........lol.

Any diagnosis is simply to get to the trans change part faster. CEO Carlos Ghosn (recently arrested) wants to change trans only, they make far more money doing that and then you don't need to pay highly trained techs in the dealerships.

The same reason used on why CVT was picked across the lines as the go-to trans type, they have maybe 1/3 the number of parts a conventional trans has (cheaper to make) and the very type sends shivers of what's that? into the DIY community to scare them off working on them.........more dealership money again. You're now looking at a legal business scam that no lawyer on earth can touch.

 

[amc49]

One day (probably not soon) all of you that think that code means the stepper is bad will find out otherwise. The code actually means the stepper is not in a physical place the ECM expects and it can have like 20 different causes, mostly from worn variators/chainbelts.

Most steppers are changed for no reason, it's the latest conventional wisdom thing like earlier trans solenoid packs were which commonly did not fix a lot of broken transmissions, and for the exact same reason. The internet again spreading bogus claims.

One guy lucks out changing that one part and all of the rest of you assume that's it! that's it!
Soooooo desperate......

 

[amc49]

Uh, they shouldn't even sell it separately at all. Entire trans only pretty much.

 

[amc49]

Transmission wear issue. The fluid cold works fine, then once it thins at hotter fully warm temperature the wear then shows when the fluid leaks badly at wear points, the line pressure then drops to affect trans working right. Why steppers commonly don't work, they cannot repair wear in hydraulic systems that makes them leak.

The wear caused the 1778 code when the stepper began to get out of the range computer expects it to be but stepper is trying to correct for incorrect ratio due to the leaks.

 

[amc49]

Uh, the car really does not care and will do what it will...............the 868 code says line pressure is too low, read post #101 again. I give it 30% odds and likely even working will quit again in the future after you 'fix' it. Once the wear has gone that far it keeps on wearing at a high rate.

Blame the super wear on the 800 psi that CVT has to have to work, normal transmissions never need any more than around 200. That is whopping pressure out of the norm and wear parts like lightning to get those codes and why so many Nissans fail that way.

 

[amc49]

Lord, it must be so painful (post 104) to have to read............

 

[amc49]

I see you have copied again somebody else's answer and posted it like it's your own.

And no long term fix report ever came back on it. Common to get car running again for a couple months max then it begins popping the code again when more wear has occurred. Or it does it in another week. Why stepper motors often are bought to accomplish much of nothing in the long run.

 

[amc49]

Runs for how long though, many get them back running but that does not repair the wear that produces the problem in the first place.

 

[amc49]

Yes, Name ONE person that came back a year later to say the car was still running after a stepper only change.

The shops that rebuild CVT will tell you in a second commonly you may only be getting minutes more car use before the trans messes up again. CVT is like a chainsaw inside a transmission, the parts wear super fast as compared to normal transmissions.

Stepper is the latest buzzword trick part like solenoid used to be, everyone wants one yet they don't work much of the time like solenoids.

 

[amc49]

You are freaking dreaming. CVT has the highest wear rate of any automatic on the planet and commonly other parts besides the stepper or VB cause those codes. The trans rebuilders themselves report many of the trans cores come in with new steppers that did nothing in 75% of the cases and they simply reuse them over in the new rebuilt trans.

There is NO band in a Nissan V-6 CVT.

Putting on a mew trans control module can be one of the worst things you can do on one.

The fluid can look very clean and yet trans be scrap due to the killer magnets put inside them. The fluid is commonly quite dirty by 15K miles.

There is absolutely no such thing as a sealed transmission and never has been.

 

[amc49]

You have the upgraded cluster; that section will also list other things like engine condition. making it NOT a CVT light per se. And your copied text even confirms what I just poated. You of course simply cut and pasted that as it sounds nothing like the utter incompetence you normally post.

Let us know when the timing chain can produce that same message, it'll be a LOOOOONG while coming though.

 

[amc49]

I don't have to find them, I make my own.

Like with you. You are too incompetent and dangerous to be giving any advice. You quite frankly don't know the difference in a tire and a spark plug. I don't mean to insult but here that is absolutely necessary, you quite simply have no business telling others how to fix their cars.