BMS reset

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fendy
Posts: 1
Joined: Wed Jan 30, 2019 3:39 pm
Vehicle: Ford S-Max 2.0 duratorq 2008

BMS reset

Post by fendy » Thu Jan 31, 2019 1:42 pm

Hi all,

After successfully replacing my battery in my 2008 S-Max WA6 2.0TDCi 130, I understood that I have to reset the BMS, I found a procedure to do so in Forscan, but to my surprise, the option isn't there. I attached the procedure. Has this option been removed or am I looking in the wrong spot?

Thanks in advance guys!
Attachments
Battery Monitoring System Reset.pdf
(583.58 KiB) Downloaded 75 times

Hayato-San
Posts: 1
Joined: Sat Dec 16, 2017 12:03 am
Vehicle: Ford S-Max 2.0 240ps 2011

Re: BMS reset

Post by Hayato-San » Sat Feb 09, 2019 8:46 am

Hello,
[I'm going to use google translate because I'm portuguese and I do not write english very well]

I recently had the same problem with resetting the battery after replacing it.

You can do it manually with a sequence of buttons without the brink of any accessory.

- Turn on the key without running the engine
- Turn on beam lights
- Press 5x the rear fog light button [is not switched on and off 5x, just press the button 5x]
- Press 3x press 3x hazard light button [the same, just press the button 3x]
- After that the battery light on the dashboard will flash
- Done!


Waiting feedback! Cheers!

vicmih1986
Posts: 3
Joined: Sat Feb 09, 2019 9:28 am
Vehicle: Mondeo/1.6 Diesel/ 116HP/ 2015

Re: BMS reset

Post by vicmih1986 » Sat Feb 09, 2019 12:28 pm

Hi everyone! I've changed my battery (Varta for Ford 75Ah 700 EFB) with a Bosh S4 75Ah 730 EFB. After replacement, I connected a Foscan and I saw that the BMS is deactivated. Then I selected the battery from a list...but I didn't found specifications for my battery, just for 80Ah or 90Ah (but nothing for 75). At that time was selected by default 90Ah so I changed to 80Ah to be closer with my specifications. After these selections, I have reset de BMS and I received the message "BMS reset was successful". I have reset all DTC to be sure that everything is ok but then I received a fault code: B1438:03-0A - Battery Current Sensor.

I turn on the engine and I have observed that my start-stop is still non-functional as before to change the battery. Can you tell me which could be the cause? Maybe I have to set back the 90Ah settings even if I have now 75Ah? Or I should disable again the BMS? If I will deactivate the BMS will be something affected for the long term?

Also, can you tell me if for Ford Mondeo MK5 is there a combination (push buttons) to reset the BMS without a diagnostic tool?

fordsmax471
Posts: 23
Joined: Mon Aug 07, 2017 5:29 pm
Vehicle: FORD S-MAX mk2 2,0TDCi PowerShift
Location: Est

Re: BMS reset

Post by fordsmax471 » Sun Feb 10, 2019 6:22 pm

Hi !

ford s-max mk2
I also had a battery replacement and I chose
Varta for Ford 75Ah 700 EFB
Battery Monitoring System BCM 726-04-01 xxxX xxxx xxxx 0=Disabled, 1=LIN LIN (Local Interconnect Network) is a series of communications technology developed for sensitive applications in the car. 2=PWM enabled
BCM 726-04-01 XXxx xxxx xxxx 10= 80Ah 700CCA T7

my device 726-04-01 1001 000 094C


BdyCM module configuration
1.choose the battery type
2.BMS reset

windscreen defrost and start -stop not working when battery level is below 70%
start-stop does not work when the outside temperature is below the permitted limit and the engine is cold

vicmih1986
Posts: 3
Joined: Sat Feb 09, 2019 9:28 am
Vehicle: Mondeo/1.6 Diesel/ 116HP/ 2015

Re: BMS reset

Post by vicmih1986 » Tue Feb 12, 2019 9:39 am

Hi, I changed the type of battery and now is activated the option: Varta 90Ah, 800cca, H8. I don't know if it is ok, but this was the option selected before to change the battery, even if I had Varta for Ford 75Ah EFB, 700cca. There are the below options in Forscan:
- 80Ah/700cca/T7 Case
- 90Ah/800cca/T8 Case
- 90Ah/800cca/H8 Case (this was set by default)
- other 3 types ..but AGM batteries.

I don't know which is the difference between H8 and T8. I don't know if is better to select the first option (80Ah) because is closer to my battery proprieties (75Ah/730cca)

PS: after battery replacement, I found BMS deactivated. So after activation, I received the DTC code B1438:03-0A (Battery current sensor). Even if I reset the BMS and the Age of battery, that DTC remains. Also, I observed that Battery State Detection Status was Out of range.

After all this, I've deactivated the BMS and run the engine straight home. I was surprised that start-stop starting to work after the engine temperature was normal. Probably when the car was running, the BCM learned the new values? I didn't check if after this event...the DTC code is still there. But...at this moment the BMS is deactivated and I don't understand why was deactivated before...(like a mention, I'm not the first owner of this car).
Attachments
BMS.jpg
BMS.jpg (40.98 KiB) Viewed 491 times

fordsmax471
Posts: 23
Joined: Mon Aug 07, 2017 5:29 pm
Vehicle: FORD S-MAX mk2 2,0TDCi PowerShift
Location: Est

Re: BMS reset

Post by fordsmax471 » Tue Feb 12, 2019 4:27 pm

if you have a battery 75Ah 730 EFB then select max - 80Ah/700cca/T7 Case
if you choose Varta 90Ah, 800cca, H8 then the battery is charged with too much amp

Ah-- is actually determining how the generator charges the battery
if you select too much Ah, the battery may boiling when the charging

if you choose Varta 90Ah, 800cca, H8 the car has information that the battery 75Ah 730 EFB is empty, the difference is still 15Ah

for example windscreen defrost and start -stop not working when battery level is below low

HandriCarter
Posts: 4
Joined: Mon Jan 28, 2019 6:12 am
Vehicle: 2012, power engine 799cc

Re: BMS reset

Post by HandriCarter » Thu Feb 21, 2019 8:20 am

Your guide helped me very much because I was facing the same problem before. These instructions are very nice and sound very interesting. Anyways thank you very much Fendy for sharing this informative article and keep sharing such kinds of articles in future.

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Please click here to learn more info.

fordsmax471
Posts: 23
Joined: Mon Aug 07, 2017 5:29 pm
Vehicle: FORD S-MAX mk2 2,0TDCi PowerShift
Location: Est

Re: BMS reset

Post by fordsmax471 » Fri Feb 22, 2019 4:46 pm

Caution!

Battery age in days can't be changed back !

if you change the battery type of old battery, the battery life time goes automatically 0 day
so BCM---BMS understands that the new battery and generator charging have changed min amps.

The 3 year old battery not desirable change type, because then it will last another 3 months ;)

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