2001 V70 AT flush reset procedure

[jking4020]

I need to do a trans flush. How do i clear auto drive adjust code from previous owner for trans when im done with flush? My mechanic? Meh!

[SuperHerman]

Two options here: 1) Fluid counter reset. This reset tells computer it has new fluid as it tracks number of "overheats". If I recall after three "overheats" it throws a code. "Overheats" are when fluid gets to a set temperature the computer programmers felt cause the tranny oil to become compromised after three such events. May have never happened in your car or may be at two - I don't think there is a way to know. 2) Adaptations reset - I think this is what you are asking about. The computer learns your driving habits and adjusts. Computer also factors in the condition of the tranny fluid as it ages and adjusts. As I understand it this process is always adapting. When one resets the adaptations one has to execute a specified driving procedure hitting certain shift points. Depending on driving environment this can be difficult - when accomplished successfully, working through the procedure one gets feedback from the dash board light confirming each stage has been accomplished.

Both can be done in VIDA if you have it. I believe some higher end scanners will have this option.

As the computer is always adjusting some people never do either and just let the computer sort things out after fluid changes. Finally, I don't fully recall, but I believe the adaptation reset also does a fluid counter reset. I have done both resets and skipped the step on various cars with no noticeable difference. Although not optimal one can just change the fluid and drive.

[oragex]

Fluid counter yes, adaptative reset I'd say no because you'll force the transmission to learn working with worn/stuck solenoids, a Volvo tech told me he has seen transmissions starting to slip (not saying he's right, but at least it's an advice from someone who works with lots of Volvo).

I am doing the adaptations reset and relearn procedure today, but I just put new solenoids in there.

[Rattnalle]

Fluid counter reset: You can pretty much ignore this one. If you do get at "transmission service required"-message ever or after 300k miles or so you can take care of it then. It's hard to trigger. It counts X seconds above Y temperature. The Y temperature is above normal operating temperature so you won't hit it with normal driving if the cooling works.

Adaption: It adapts continuously. I'd say don't fix what's not broken. It's meant to be used if you take it apart to change stuff. The driving procedure seems to pretty much require a long, straight and very empty piece of road where you can both stop and then go quite fast. I'd say you have to do this at 3 in the morning or so when there's no traffic.

[oragex]

From my Volvo tech, the fluid counter thing is related to the fluid wear. New fluid -new properties and the transmission operation is adapting to this parameter. In other words, the transmission works in one way with an old fluid, and in another way with fresh fluid. This being different than adaptation mode.

My mechanic did put the transmission today in learning mode (adaptative reset) and by default this did also reset the new fluid counter.

[Rattnalle]

As far as I've been able to read up on it the fluid counter itself doesn't have any impact on adaption. The adaption does take into account how the fluid behaves when new or worn though. But I could be wrong on this.

I reset my fluid counter about 10' km after changing all the fluid. The improvement came right away with the fluid change but nothing noticeable when resetting the counter.

[jimmy57]

Let's get square on adaptation; This is something the computer does to adjust to THAT transmission, NOT YOU. Trans Control Module, TCM has a default solenoid signal value and a target sift completion time value. When new it starts adjustng solenoid signals if the time is greater or lesser than the shift target time. Resetting adaptation values clears registers in TCM so that starts over from new default values. It is also a quickened pace program as compared to new TCM adaptation. This is the TCM learning that transmission, not learning you. TCM has different load ranges it adapts in in order to have correct shifts for easy, moderate and aggressive driving.

There is a mode in TCM where it sort of learns your current driving style. This is done in situations where you may be driving aggressively on a curvy road. You accelerate, coast, accel, coast, accel and then when you lift it holds the lower gear. Normally when you ease off throttle the TCM goes to higher gear as the gear range is derived from speed vs. throttle/load. Low throttle should normally be an upshift for better MPG. When the pattern is repeated where you lift and get into again it will be in wrong gear and have to downshift in order to have good acceleration. I occasionally get this to happen in some cyclic rolling traffic jams when you are in no car to car gap mode. This mode is exited if throttle application pattern returns to normal.

[Rattnalle]

Let's get square on adaptation; This is something the computer does to adjust to THAT transmission, NOT YOU. Trans Control Module, TCM has a default solenoid signal value and a target sift completion time value. When new it starts adjustng solenoid signals if the time is greater or lesser than the shift target time. Resetting adaptation values clears registers in TCM so that starts over from new default values. It is also a quickened pace program as compared to new TCM adaptation. This is the TCM learning that transmission, not learning you. TCM has different load ranges it adapts in in order to have correct shifts for easy, moderate and aggressive driving.

There is a mode in TCM where it sort of learns your current driving style. This is done in situations where you may be driving aggressively on a curvy road. You accelerate, coast, accel, coast, accel and then when you lift it holds the lower gear. Normally when you ease off throttle the TCM goes to higher gear as the gear range is derived from speed vs. throttle/load. Low throttle should normally be an upshift for better MPG. When the pattern is repeated where you lift and get into again it will be in wrong gear and have to downshift in order to have good acceleration. I occasionally get this to happen in some cyclic rolling traffic jams when you are in no car to car gap mode. This mode is exited if throttle application pattern returns to normal.

I don't think anyone here is thinking about the short term driving style adjustment. No need to drag that into the discussion and complicate things.

[abscate]

Well, dragging that into the discussion taught me something I thought I knew, but was wrong.

[oragex]

Last Friday the Volvo guy erased the prior adaptations which did belong to the old clogged solenoids and put the TCM in learning mode. We did this in a hot day because the transmission needs to be fully warmed up. Once he unhooked Vida the display did show a message like 'transmission fluid warmed'. I started driving the car around and the yellow triangle would lit for 2 seconds when the TCM would learn a new 'step'. These steps where always related to an upshifting or downshifting. I tried to follow the whole Vida procedure (see attached file) but it takes much too long because the yellow triangle doesn't always light, so you have to repeat the step again and again until seeing the light. During this whole time, the display would not show D for the transmission, but rather the gear (1, 2, 3 etc) just like on a manual transmission. Went also to do the garage shifts and engaging the D turned very smooth after a little N to D shifting and yellow triangles.

However when I stopped the engine then restarted it, it seems this learning mode doesn't engage again to finish the whole learning.