Toyota Altis Grande CVT Fluid Change (Transmission code K313)

[bridgedoctorali]

Pan opening was not needed if it was your first time and mileage and time was within the owners manual stated limits .

Calibration process is okay.

[nifiii]

Dr. Sb, what if I get my car’s first CVT oil changed after 40,000 kms and 3 years have passed, does that require pan opening then?

[bridgedoctorali]

In general I will suggest to avoid pan opening as much as possible, unless conditions force you to do so.

In your case at 40,000 km and 3 years - I personally would not open pan! As per UER'S MANUAL you need to inspect the CVT fluid. You should collect a 5 CC to 10 CC sample in clean tube. Inspect for color and odor.

If it was me, I would have gone for CVT fluid Drain-and-Fill (as described in this thread).

[SpeedDemon]

This is slightly off topic. 2015 Corolla 1.3 with four speed auto.

Recently had the tranny oil changed at 55000 kms. Pan removed, filter cleaned.

Filled with Toyota T-IV ATF oil as per owner's manual.

When car is in D with brake pressed, and engine is warm, the car has a jerking movement, not a smooth creep forward. However, it feels as if the car has more power being applied although the engine is at idle.

Is there some re calibration needed on this tranny too? Could this be a different level of lockup of the torque converter at idle? The rest of the drive is fine and super smooth.

[bridgedoctorali]

I suggest to do calibration. Also do the learning reset. Deceleration sensor zero reset should also be done.

[SpeedDemon]

Thanks for this info. However, I may not have access to Tech-Stream. I may have access to Launch scanner.

Will it be able to do this or just screw it up even more!

[SpeedDemon]

If you can tell me which OBD2 scanner is used with Techstream, I can do this at home!

[bridgedoctorali]

I think Launch must be able to do it, if it's professional version. Every such tool most be used carefully.

[bridgedoctorali]

There is no scanner with TechStream. The software is installed on laptop and USB port is used to connect it to DLC3 Port on car.

[rajaatta]

Primary shift valve along with main pressure regulator valve stuck problem you are facing. Get the valve body assy serviced and it would be fine. Remember no calibration can clear the particles from pressure valves inside the valve body assy

[bridgedoctorali]

Calibration is not a physical intervention rather correction of parameters. Since they issue aroused after service and refilling of ATF only therefore calibration would be first checked. If calibration is not correct same symptoms can happen. At 55000 km it's very low possibility of having stuck valves etc.
As logical step I would suggest simple doable things first and then moving to complicated things.

[rajaatta]

I think you had never been into auto transmission repair or rebuild service before. There is no such calibration exist in Auto Transmission and the symptoms told by fellow member are directly related to complicated stuck valves due to clutch debris in the valve body assy. The thumb rule is change your transmission oil on time if not possible then always inspect for the discolour and burnt oil if found burnt always flush the transmission fluid which consumes almost 15 to 20 liters of atf.

[rajaatta]

I had sawn and maintained the same scenarios in ATM of toyotas which has stuck and jammed valves till 40 k . Company is recomending that change the oil at high milage which is totally messed up AtF t4 doesnt survive beyond 35k kms and detoriates badly. 55k is worse for it.

[bridgedoctorali]

I am struggling to figure out, what should I say on a non-professional comment. Difference of opinion can exist between professionals which is normal and to me is healthy, as it brings out various aspects. However being judgmental on personal level is on low side ... and should be avoided. I am not here to throw out my CV of 22 years of work!

Can you please share your STEP-BY-STEP started thread which is written for PW community while considering STANDARD OEM procedures? (apologies in advance for asking this, as I am not a routine user on PW, so would like to see your technical contributions/articles and would like to learn from your valuable work shared here)

However, on positive side, your technical comments and efforts are appreciated (which need deliberation of course).

Secondly, this thread here is not to share Rules of Thumbs - rather to state OEM procedures. I have yet to come across an OEM procedure which directly jumps to conclusions!

A separate thread can be started on what is Calibration? In case if it is not clear to many people. How does a close-loop system if not calibrated could result into abnormal behavior will become very clear and how a calibrated system behaves will become evident.

Dear readers, please bare in mind few things whenever you encounter an issue:
Step-1: Never, ever jump to conclusion on first instance (the biggest mistake we generally make)

Step-2: Always follow the First-Principle approach. The OEM repair manuals always proceed with basic first principle.

NOTE: OEM Procedures ALWAYS make certain that an issue is 100% diagnosed before any repair work is started. (I see on daily basis that people are generally guided by hit and trial methodology)

Step-3: If choices are limited due to no access to reliable sources who can follow OEM procedures (which many dealership even wont do), always take the simplest and basic steps. Aggressive, approach leads to complicated issues. Many times sellers/mechanics etc want to go for profitable course, be very careful.

[bridgedoctorali]

You have touched on an important and interesting topic. I am also of the view to be conservative. However, I will recommend that ALWAYS FOLLOW the User's Manual.

Once, my thread is complete (which is 90% for now) I will share a very interesting case-study of a Grande Dec 2015 whose CVT fluid was never changed till Jan 2019 and it was driven 130,000 km.

What is your guess in this case?

[SpeedDemon]

55k and T-IV are as per OWNER's MANUAL. I will try and check the electronic calibration before opening up the tranny because remaining operation is fine.

So what is the device that connects your computer to the DLC for using TechStream? And where can I get it? I am assuming you are talking about a wired version that uses USB port.

[bridgedoctorali]

That's the best approach. 55k km as per manual is okay. Did you do inspection at 40k km as required by manual?
Are you the first owner?
I will send you picture of cable that is used with laptop.

[SpeedDemon]

Yes. Have been closely checking the vehicle at regular intervals. First owner. The vehicle is lady driven mostly to work and back and rather gently, but I take care of all maintenance.

[bridgedoctorali]

Good job. In-Sha-Allah, I see no issue hopefully.
What was the procedure of changing the fluid? Three times as I stated? Or only once?

[rajaatta]

We were talking about.the calibration of toyota normal ATM transmission. THERE are no calibration exists for atms like we had in cvts pressure calibrations.
THE member was feeling the harsh engagement which was caused by the regulators stuck comonly seen in toyota atms.
So your point was do the calibration and adaptations would do the job. In my experience adaptations foesnt clear a jamming valve. So brigss no personal offence here we are here to share our experience and help other fellow members. Good luck.