Climate Control Nightmares Topic is solved

[xanthefin]

I'll have to check to make sure it's seeing alternator voltage. Which pins should I probe to find this? I'm almost positive it is seeing it, because if I try to run the relearn without the car running nothing happens (forgot that step once) but with the car running it always flashes the AC and both recirculate lights while it runs. It goes back to just flashing AC on light when it fails after about 10 seconds.

It does let me turn the flap in the case with a screwdriver when the motor is removed - it turns very easily so it's not like it's too much force to overcome or something like that.

I'll have to live graph the position data - wasn't aware I was able to do that. Thanks. I just pull the motor out (leave plugged in) and spin the square metal part by hand and watch the live data?

I don't think it's an ECC module internal fault since it does the same thing across two different ECC modules, and it occasionally throws an ECC-212 code instead.

Yes and i think best wait that 10 seconds over so ECC not trying control it (and engine off). If it lets gently move it manually and see if it registers any movement (and then seeing in graph does it move smoothly or is there extra spikes like lost steps or else funny business) and then put back where it was.


Its not just 211 fault code. There is 212 too and 7 in total Volvo handles in their "upgrade". I think they noticed finally themselves something "wrong" and resulted them making procedure for these fault codes and these were noted in cases if self calibration fails.



There is data slot i noticed after one send log gets turned to FF when its in learning mode and 00 when its not. One possibility is try (if module lets) over run this data but its then last resort try "cancel".

[xanthefin]

There is now via update to 1.6.2 version in Service terminal (next to "SEND" button) if you write with up/capital letters "ECCUPDATE" and press SEND you get popup for possibility test Volvo's update procedure for these fault codes it might report if everything is otherwise ok in the system.

[V50M66]

Awesome, thank you. Been low on free time and motivation this past week, but I'll take the time in a day or two and go through all of this and report back how it goes

[V50M66]

Ok, pulled the damper motor and graphed the data. Couldn't get it to spin by hand, and even with no movement whatsoever, this is what it spat out:

Screenshot_20230531-140111.png (96.03 KiB) Viewed 355 times

I'm assuming this means I need a new damper motor?

EDIT- I didn't start the test correctly the first time. Started and running as it should, the graph stayed at zero the whole time, even when I took the motor apart and moved the wiper to different positions

[xanthefin]

Ok, pulled the damper motor and graphed the data. Couldn't get it to spin by hand, and even with no movement whatsoever, this is what it spat out:
Screenshot_20230531-140111.png
I'm assuming this means I need a new damper motor?

EDIT- I didn't start the test correctly the first time. Started and running as it should, the graph stayed at zero the whole time, even when I took the motor apart and moved the wiper to different positions

Okay i see.

I am not yet got second confirmation if stuck in Adaption it makes these Scrolling values / Live data in halt (never had thought ask before this detail). So far got from good one it sends okay data recently so App shows well if there is anything report.

But as secially you got motor apart and did simulate it moving already so it should report back...
And as when all items too stayed in stuck position like REC button or compartment fan. I am listening others do they have similar "feature" and write it down there.


I wouldnt make decision based on this test anymore about that motor being good or bad as cant see.

Here some idea try bench run damper motor if want continue diagnosing it.
viewtopic.php?t=34858

As you explained damper motor did have originally some funny business so i dont rule yet out it being bad.



Thanks showing graph. I will make some adjustment to it look as it looks quite funny if nothing as those are default "test" graphs when not yet running (for now had required restart live stream when moving between text and graph but its been requested so wouldnt need.. Need continue think ways overcome limitations i have had for that).







For your question it might feel stuck due gearing (small motor through gearbox get more torque) if trying rotate from other end might be feeling like "stuck" like hand drill..
Which could make sense..





In the end after doing all i would try with "update" via Service when motor attached back then.

[V50M66]

The recirc button lights change when I press the buttons on the ECC but the app shows that the motor didn’t change. The compartment fan does respond to the slider and works as normal, but it doesn’t show changed value in the app. Perhaps the ECC doesn’t report data values when stuck in relearn? Only thing that changes in live data is Alternator D+ signal as far as I can tell.

I tried the ECCUPDATE command and selected the first option for software update. It seems to have taken the update successfully, but it seems that it doesn’t want to take the relearn command anymore. Tried it a few times. I’ve driven it twice since then, I’ll try it again next time I drive it.

[xanthefin]

The recirc button lights change when I press the buttons on the ECC but the app shows that the motor didn’t change. The compartment fan does respond to the slider and works as normal, but it doesn’t show changed value in the app. Perhaps the ECC doesn’t report data values when stuck in relearn? Only thing that changes in live data is Alternator D+ signal as far as I can tell.

I tried the ECCUPDATE command and selected the first option for software update. It seems to have taken the update successfully, but it seems that it doesn’t want to take the relearn command anymore. Tried it a few times. I’ve driven it twice since then, I’ll try it again next time I drive it.

Yeah i suspect highly its the case when stuck in learning state it won't report on things anymore.

Please send datalog via settings menu (bottom has button if datalog had been turned on). Shows some details what all happened during process. I have hint whats may be cause for reaction example if there was fault codes still visible.


One thing i would be doing is (or make sure)..
*Cycle ignition off and on and engine running after parameter updates (ECC seems requiring this each time).
*Have engine running but not be driving for relearn (propable as it sees speed it could block it).
*After engine start have at minimum 1 minute let ECC "settle" own business before sending relearn command.


Secondly.. did blinking lights change now then compared previous state?

As an update I got feedback from very helpful user that eccupdate command #2 did make ECC resume to be normal operations again. So give it a shot if want go back. After running command you need cycle ignition off then back on and engine running. This did not make relearn to succeed but got it out of learning process and live data showing so you might be able diagnose which one is misbehaving then.

[V50M66]

Tried driving it again and relearning again, no luck. Still just flashes the AC on light (error), not the three lights together (relearn in progress).

Blinking hasn’t changed, aside from it no longer doing the 3 light blink when relearning (likely because it doesn’t want to relearn).

Did eccupdate command #2 successfully. ECC has no more blinking lights, works on passenger side as before, but not on driver. Was on cold, moved dial, and it went full hot and stuck there. Will try graphing data again of the motor and posting the log.

[V50M66]

Ok, did the live data with the ECC not in relearn. It is reading properly now.

As I change the knobs both graphs (driver and passenger) both correspond correctly to what the output SHOULD be on the blend door. The passenger side responds perfectly. Driver's side says it's doing the same as the passenger side when graphed, but it's clearly not since the air coming out of the dash never changes from full hot. No weird graph or anything. Note that I dragged the graphs to overlay nicely for comparison, I was changing the temps separately, going between full hot (100%), 72 (roughly 7-10%), and full cold (0%).

Screenshot_20230603-191032.png (111.35 KiB) Viewed 262 times

Screenshot_20230603-191009.png (110.73 KiB) Viewed 262 times

[xanthefin]

Tried driving it again and relearning again, no luck. Still just flashes the AC on light (error), not the three lights together (relearn in progress).

Blinking hasn’t changed, aside from it no longer doing the 3 light blink when relearning (likely because it doesn’t want to relearn).

Did eccupdate command #2 successfully. ECC has no more blinking lights, works on passenger side as before, but not on driver. Was on cold, moved dial, and it went full hot and stuck there. Will try graphing data again of the motor and posting the log.

Thanks for report and that live data now doing something more useful when not in learning mode. This is big step forward as now people can cancel ECC relearning first time ever in history as not even Volvo has that feature in their tools i guess only engineers did have it.

I will try add on next update additional Graph as i was trying make it hw accelerated so can get longer and faster it out but i don't have any estimated as when finished.

Due this communication is not fastest and each item/command adds delay for to refresh all though you can run only either of them one of the time to get even more detailed graph.

Hope you get ECC fully fixed.



I shortened all you have done as i find you already done much.

A few weeks after getting the car initially, I noticed that the driver's side climate control (ECC) was stuck on full cold. Going into the winter at the time, this wasn't going to work, so I replaced the driver's blend door with a known good unit out of my '99 XC parts car. Still nothing.

I then tried replacing the ECC module from a wrecked '98 S70. Since it wasn't stuck in relearn, it worked, but only on the passenger side. Now, the driver's temp motor would choose by itself whether to go full hot or full cold - I had no control over this.

I then tried replacing the entire ECC subharness (the wiring harness connecting all the blend door motors to the ECC) and relearning. Still nothing, still stuck in relearn, still with code ECC-211.

I tried replacing the interior temp sensor, no luck.

I then replaced the blend door motor again, this time with the passenger side motor out of my parts car. Still didn't pass, this time with an ECC-212 code.

So I pulled the first replacement blend door apart as described in a thread I saw and cleaned all of the white lithium grease off the contacts and carbon traces inside the unit. Reintalled it, tried to relearn again, and still nothing, with an ECC-211 code.

It does let me turn the flap in the case with a screwdriver when the motor is removed - it turns very easily so it's not like it's too much force to overcome or something like that.

My guesses from symptoms (though some may have better familiarity of ECC damper motors than me ever as i have just MCC):
ECC PCB having cold soldering somewhere for this specific damper motor output circuit or its control circuit..


Here is manual https://volvornt.harte-hanks.com/manual ... c.htm#pg37

Can you post screenshot of live data in text mode which shows all so like Circulation and button status? And confirm buttons are as so reported as ECC has some functions it does only for passenger reading in manual example if its in recirculation activated.