CVT Transmission Stepper Motor
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- Опубліковано 21 гру 2012
- CVT Stepper Motor
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The CVT stepper motor, is the largest source of trouble of modern CVTs, and the most replaced component in them. Modern CVTs use various solenoid valves to accomplish the task of varying the variator or pulley width. Some CVTs use what's called, a Stepper or Step Motor controller. The CVT valve body also consist of pressure sensors, variator pressure solenoids, torque converter clutch solenoids, and a unique stepper motor for controlling the pressure split between the primary and secondary variators.
These CVTs have three, PWM or pulse-width modulated controlled solenoids, which are the Secondary Variator Pressure, the Line Pressure, and Torque Converter Clutch. They also have a single old fashioned, on off solenoid for the TCC lockup.
The Secondary Variator Pressure Control solenoid, controls the position of the ... Get the whole story right here in this video... Enjoy...
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Thank you for your kind reply. I am a 38 yr semi retired tech/shop owner living now in the Philippines. We have reopened our auto repair shop here after seeing huge need and lack of knowledge here on the newer systems. Your videos helped me greatly learning about key transponders. And now CVT ,that I see is being sold by Nissan here in the Phils. Thank you so much for your efforts in making your wonderful videos.
Thanks, the CVT videos will become a 30+ videos SERIES, so stay tuned. Yes, it is a cost effective transmission to make and maintain. The high costs of rebuilding is associated with the fact that few techs know how to work on them. It is very simple to work on them, but it's a new technology. Thanks for sharing and supporting.
Fantastic logic on your part. The TCM uses the pressure sensors (primary and secondary) to know if there's a slip. Please, take a peek at our other videos in this series "CVT Transmission". Go to our channel "ADPTraining" and see the PLAYLIST. One of our videos cover a little more about pressure sensors. There'll be a future video on this subject. Each pulley also has a speed sensor. TCM uses all these to work the pulleys. Press. sensors are used to detect a slipping belt. Thanks for posting.
Thank you very much. Merry Xmas to you and thanks so much for posting and participating. Mandy...
Love the video as I am studying this type of transmission. Merry Christmas and God bless.
Thanks for sharing. Future videos will be posted as this Series continues...
You get a thumbs up just for the engine sound effect in the beginning!
Great video like always, The CVT on my old snowmobile is so much simpler lol
I really enjoyed this video. I love the CVT in our 2008 Nissan Rogue. We already have 120K miles, we bought it used, and it was a rental. Nothing more than a CVT fluid change has been required thus far. I hope CVT technology continues to advance, IMHO it is the most ideal transmission..great for going fast and for getting peak economy.
Not the voltmeter. TO test the stepper motor you need a stepper controller module or circuit. These units don't operate on voltage alone, they work on pulses, similar to robotics.
Thank you very much...
Yes but you need to be familiar with stepper motor coil wiring a bit. It no big deal but you need to know how they work...
je possede une altima coupe sport,tres bonne mecanic.
j'aimerais savoir la dure de la transmision avant problemes
Great Info, thanks Mandy.
Can You show how to remove and replace the steel belts of a CVT?
Thanks, my car does not have the right fluid it needs a thicker ns-2 fluid but when my car broke down the power output was in at a stop light, car stumbles then gives it power, (took a turn) then i gave it gas it had power for a little then power was completely cut off and i had to pull on to a shoulder. I had burning smell beforehand and the cvt was quite low on fluid. I had to get replaced but like i said wrong one so i need to buy new fluid and drain the replaced incorrect fluid. There arent many thing that can stop a cvt vehicle from moving entirely one of few mechanical issues my bet is something in the valve body, the fluid(as its responsible for the transmissions capacity for functioning), electronically could be the tcm, wiring harness that attaches to the cvt and to the tcm or the power. My codes that i will say dont seem likely to be the problem but electrical symptoms are p0725,p0836, p1701.
Root codes being
And the same p0744 torque converter circuit intermittent
p0744 a/t torque converter clutch solenoid valve function
Abs c1109 vehicle battery voltage abnormal.
The battery light isnt on.
i have primera p12 2.0 automatic, sometimes stuck in one gear, no gear changing in cvt, guys do u have any idea what is the wrong? i change cvt fluid and ran 10,000 kms only, do u think it can be step, stepper motor in cvt??how can i know where's the exactly problem is?
These belts are not sold separately. They're sold together with the variators or pulleys as an assembly...
Yes
Thanks for the great videos!
Another great video series on cvt's where one can see complete tear down and reassembly on these transmissions are Saturn Vue and Nissan Murano CVT videos by Questioning3 here on UA-cam.
please diagran of body valvulas
Many thanks for your video. We buy a lot of Nissan products at our car auction. We pick them up for $2000 at our local Nissan store, the are rebuilds. I am going to have my tech review.
Thanks for the edgamakation
Ok
I can assume there would be great damage to the pulleys if the steel belt were to start to slip due to lack of clamping force. Does the computer have a way of sensing this? to prevent this damage. Like ABS speed sensors, or the like?
Where can I buy transmission step motor for a Nissan rogue I live San Diego
@@juliolovesandiego ebay
so can you change a stepper motor or you have to replace the transmission?
You can replace stepper motor
Glad to hear that it’s been such a mess having my car broke down and getting to work I’ll be able to afford to change that . And 213k on the dash . Engine runs great tho I haven’t had any problems out of it until this
@Critical Thinking
Cool
Same with mine but my car broke down and doesnt move idk if it just needs a proper fluid change as it did burn the fluid down to bone dry pretty much or if it may need a valve body replacement which the autozone test performed before my car broke down said i should do that.
You can't use the same scooter technology on cars. It has nothing to do with money. It has to do with torque, matching engine power to the wheels. It has to do with economy too. The other alternative is to put more gears into an automatic. Mercedes developed the 1st 7 speed automatic and now working on a 9 speed auto. That's great but more costly. CVTs are a great cost effective answer to matching torque to power the tires. Thanks.
Great video. Very informative. Thanks a lot.
I disagree
I’ve got a 2013 rogue , code p1778, replaced stepper motor, drained flushed fluid changed filters, feels like it is stuck in low speed. Doesn’t go over 20mph and revs all the way will not “shift” everything I can inspect looks fine , any idea where to go from here?
Did you ever find out what the problem!? Mine wont come out of first gear I have the same problem with my 2008 Nissan Altima also change the stepper motor on the valve body n the fluid and it does the same thing i bought my stepper motor aftermarket on Amazon which they say don't do cause it's refurbished
good dood
Scooters and the like use this technology,and it's nothing new.We had these transmissions on our snowmobiles back in the 60's.If you kept the engine aligned,and didn't have any oil leaks,the belt (looked like an overgrown fan belt)would last the whole season,running as hard as you could.If you took it easy and sprayed belt dressing on it once and a while,you could get 2 seasons easily.Belt cost:$25.00.Some sleds you could change the belt in 15 min.Now, too complex so they can make money, money!
I know this is a old video but I need help recently my 08 Altima with 2.5 4 cal and the cvt transmission would shake when letting off gas at stop to accelerate then a day later it won’t move at all cranks fine and when you put it into gear and give it gas it barely rolls forward and backward I’m getting the p1178 stepper motor check engine light . Anyone out there with knowledge of this would you think it will fix it if I replace the stepper motor besides replacing whole trans ? Any help would be very appreciated
Good thing is if you're somewhat mechanically inclined, these are easy to rebuilt. Kit includes preloaded belt. Your trans is sealed, you gotta take it apart.
Hey there are videos on UA-cam that shows you how to change it .I got one on Embay for less that 35.00
So me getting that code is def the stepper motor and not something worst ? Once I get it moving a little there’s vibrations and noises from under it
I can replace the stepper motor but don’t wanna do it and put it back together if it could be something else besides the little motor
@@jameshudson3987 yes I took my 08 Nissan rogue to the dealer they told me it's the step motor. Nissian would normally replace the transmission but because mines is out of warranty they didn't fix it.
My 2016 Nissan Altima it revs up and down when I drive it and jump when it changes gear .I replaced the valve body. Does it have to be re program? IT HAS A P17F0 PENDING CODE . WHAT CAN BE DONE ?
You need the following www.autodiagnosticsandpublishing.com/Automotive_Interactive_Wiring_Diagrams.html and then choose your vehicle type. Then we can start the diagnostics process.
If you changed the valve body, you have to remove the ROM chip from the side of your original valce body, and install it on the new valve body.
If you failed to do so, you need to have it reprogrammed.
@@splash5974 thanks much ..I sold the car . If I had gotten this before I'd do it ..they keep telling me I need transmission.
@@rayonwilliamssportsandfun2106
Just came across your comment today. Sorry to hear that...
@@splash5974 thanks.. yea. I lost a little in it but was willing to . Because it was better than the 4000 they telling me about to replace the transmission. I went to the Nissan and was gonna do the programming they told me it wouldn't make sense because the code was code of death and it was about 200 to jus do the programming. Nissan cars are wack
Wow! The stepper motors have the most problems?! Figured it would have been the belt, lol. Thanks for making these wonderful videos. They might be educational, but I find it entertaining =D Really wish you would do away with the synthesized voice, but I understand why you use it =/
Thanks for sharing.
Christopher Pinterich
Yeah no the belt is actually built stupid tough because they new that becoming a failure point would have discredited them as a car company like wholesale. So they went with other failure points. Also lying about the cvt fluid service intervals so that they can justify charging crazy sky high prices to replace the transmission when it inevitably goes super bad because its not being serviced correctly as in on a 25k or 30k miles basis. The worst these cvt’s can get is yes a complete snap of the belt but i have not read one instance of that happening. They could probably go with a rubber polymer belt and make it have an easy access point to replace it if it snaps and use probably the same fluid and the car would be just as if not more reliable with less issues the only thing would be the belt which they could produce or other companies could make after market and engineer them to prevent slippage a WHOLE LOT MORE and with easy access point and an engineered easy way to install even from home this could probably be the perfect transmission.
How much It cost?
Whatever you want to pay.
Momma HE HAS THE RIGHT TO FIND OUT WHO HIS DADDY IS!!!!
TAKE ACCOUNTABILITY MOMMA!!!!😢