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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Mon Dec 16, 2019 11:05 am 
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Joined: Thu Sep 05, 2019 8:21 am
Posts: 4
jpleduc wrote:
Smitsu2019 wrote:
Question do you turn off the vehicle after the aux battery is drained down then continue?[/quote

I did not drain my battery to do the reset.

I tried that method but the EVSE never activated. I presume that the Aux Voltage was too low for the EVSE relays to turn on.

In lieu of draining the battery I installed a diode dropper which essentially lowers the AUX voltage to the desired voltage level. It is better for the AUX battery health and resolved the issue of not being able to activate the EVSE.

So here are the steps I followed

1) Turn on the vehicle (press start twice) without pressing the brake pedal

2) Drop the voltage until the alarms shows up
(I-E EV System Service Required)

3) Turn off the vehicle
==============

4) Connect the charger

5) Apply the 12 V back (for a short period) until EVSE activates
In my case I simply had to bypass/remove the diode dropper circuit.

6) Disconnect 12 V aux battery as soon as you hear the EVSE relay activation
(You will hear strong clunking noise)

At that point the BMU had reset.

I suggest that you talk to your dealer first. May be you can get them to perform a proper BMU reset. As long as Mitsubishi has not fixed the battery degradation problem they should do the BMU reset free of charge as soon as the vehicle SOH drops below 4 or 5 % per year of usage (ie if SOH is less than 96% after 1 year or sooner, 92% for 2 years etc). If I were to buy an outlander PHEV today I would demand that this be added in writing on the contract.


Hi JP,
Did you have to Turn on the vehicle (press start twice) without pressing the brake pedal even with your diode dropper to reset the BMU? Or you just add your diode between the Negative pole of your battery to reset the BMU? What king of diode and how many did you use?

Thx


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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Mon Dec 16, 2019 2:29 pm 
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Joined: Sun Dec 23, 2018 10:23 am
Posts: 24
Once the diode dropper circuit is installed and all switches are short circuiting the diodes so that the car sees the normal 12 V from the AUX battery, then you must turn on the car without pressing the brake pedal. Make sure that you do not have any accessories on (Fan, Heater, AC, Seat or Steering heater, lights, radio etc) in order not to exceed the current capacity of the diode dropper circuit.


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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Mon Dec 16, 2019 2:45 pm 
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Joined: Sun Dec 23, 2018 10:23 am
Posts: 24
I used 4 10a10 Silicon Rectifiers Rectifier Diode (Spec 10a 1000v R-6 10.0 Amp Silicon Rectifiers)
I bought the 10A10 online from Newegg.CA

and I also used 3 schottky diodes rated 0.3A, connected in parallel. Bought those from a local shop. Don t have the PN.

Bye


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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Tue Dec 17, 2019 4:53 am 
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Joined: Sun Dec 23, 2018 10:23 am
Posts: 24
Schocttky are 3.0 Amp each Not 0.3 Amps as i Indicated in previous communication

JP


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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Tue Dec 17, 2019 6:12 am 
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Joined: Thu Sep 05, 2019 8:21 am
Posts: 4
jpleduc wrote:
Schocttky are 3.0 Amp each Not 0.3 Amps as i Indicated in previous communication

JP


Thanks!

You put the 10a10 Silicon Rectifiers Rectifier Diode in series? You used 4 of them to drop the Voltage enough?


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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Tue Dec 17, 2019 7:16 am 
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Joined: Sun Dec 23, 2018 10:23 am
Posts: 24
Here is a possible circuit.

I put several Ds diodes in parallel as they are only rated 3 Amps.
Attachment:
Diode dropper circuit.jpg


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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Tue Dec 17, 2019 7:40 am 
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Joined: Thu Sep 05, 2019 8:21 am
Posts: 4
jpleduc wrote:
Here is a possible circuit.

I put several Ds diodes in parallel as they are only rated 3 Amps.
Attachment:
Diode dropper circuit.jpg


Thanks alot!


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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Sat Jan 11, 2020 4:58 pm 
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Joined: Sat Nov 23, 2019 12:50 pm
Posts: 7
Down to 33.3 now this seems to degrade very fast compared to other Mitsu PHEVs.


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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Mon Jan 20, 2020 4:25 pm 
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Joined: Mon Mar 12, 2018 3:12 pm
Posts: 19
Location: Calgary AB
I just did another reset using the same procedure I posted before but this time the drive battery was almost full and I did not run the 12v down.
So it only took a couple of minutes to do. Not sure why.
But this time it triggered engine light with P1AE6 error. Reset the fault code and it seems fine now.

_________________
2018 Tesla Model 3 Performance
2018 Outlander PHEV GT
2017 Leaf SV
2014 Tesla S85 sold
2011 Leaf SV sold


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 Post subject: Re: BMU Reset for 2018 Canadian PHEV. Alternate method idea
PostPosted: Tue Jan 21, 2020 2:59 am 
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Joined: Wed Jul 31, 2019 8:16 am
Posts: 171
How did you reset the fault code?

(For me the yellow lettering in your signature is unreadable)

_________________
2014 3H, 20K Miles
Bought June 2019
podPOINT 16Amp EVSE
Wiltshire UK


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