I was told by the dealer that the shorting of the 12v leads is one of the approved steps/workarounds in the TCU update.
Afterwards the gauges were off until one drive/charge cycle. -- -Chris On January 26, 2017 12:29:37 PM CST, Cor van de Water via EV <ev@lists.evdl.org> wrote: >The Supercaps that you mentioned are present in every car with >electrically operated brakes. I know of the supercap bank in the trunk >of every Prius since pretty early on (I think the "Classic" 2001-2003 >does not have it, but I am certain that since 2004 it is wht allows you >to apply brakes a few times when suddenly the aux battery goes out >while >driving). >I checked the wiring diagram and indeed there is a "Brake Power Supply >Backup Unit (B15)" on the diagram. Typically those will *not* feed >power >back to 12V aux battery, so this should not be the reason a car behaves >differently with a short or long disconnect of the aux battery. >What might be the case is a capacitor on the memory of a computer that >is designed to withstand a short disconnect, to allow you to change >your >battery without losing all your settings. >Typically such a capacitor is not feeding back to the aux battery >either, so in any case clicking the loose battery wires together should >make very little difference in how long it takes for the car to behave >differently. > >Also, the LBC validation happens without disconnecting the aux battery. >I know for sure as I never disconnect the 12V battery and when I >swapped >my pack for a complete replacement pack from Washington State, the >yellow light on the dash came on and my Leaf was in Limp mode while I >only disconnected the (non-energized, due to the contactors in the >pack) >HV lines and the control bus. >Just wheeling the original pack back under my Leaf and swapping the >connectors removed the Limp mode, so I know for a fact that the Leaf >validates the battery upon pressing the power button while the aux >battery is connected continuously, so it seems that you were looking at >the wrong thing. >Probably a trace of the EV bus as soon as the power button is depressed >(when a *lot* of communication is happening) will tell the story. >You may start the trace as soon as the brake is pressed. >Good luck! > >Cor van de Water >Chief Scientist >Proxim Wireless > >office +1 408 383 7626 Skype: cor_van_de_water >XoIP +31 87 784 1130 private: cvandewater.info > >http://www.proxim.com > >This email message (including any attachments) contains confidential >and >proprietary information of Proxim Wireless Corporation. If you >received >this message in error, please delete it and notify the sender. Any >unauthorized use, disclosure, distribution, or copying of any part of >this message is prohibited. > > >-----Original Message----- >From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Collin Kidder >via EV >Sent: Thursday, January 26, 2017 8:02 AM >To: Tom Parker; Electric Vehicle Discussion List >Subject: Re: [EVDL] Anyone interested in 2015 Leaf drivetrain or >interior/exterior/suspension parts? > >10 minutes should have been enough. Chris suggested shorting the >positive and negative together to drain any capacitance and force the >ECUs to reset but I cannot imagine an ECU lasting 10 minutes on its >input capacitors. Though, I think that the leaf actually has a super >capacitor behind the rear seats so it might take a long time to drain >that off. It might be worth a try to make sure the 12v wiring is >really, truly drained. I did some work with adding a secondary battery >pack and initially made a number of bad mistakes that caused critical >ECU faults. Disconnecting the battery for a few minutes would not >allow me to clear the faults but disconnecting all day and trying it >again the next day would work. I think eventually someone suggested >shorting the battery terminals and doing that does allow for resets >more quickly. Though, if I'm right about the super cap being for the >12V power then you might want to discharge through a power resistor >and not just click the terminals together. It doesn't hurt to use a >resistor in either case. It's better for the car anyway. > >Otherwise, it does appear we're looking at a message that is more >continuous. That doesn't mean that it necessarily happens quickly. On >the Tesla Model S there is a series of messages that transmit the VIN >number of the vehicle, presumably for authentication with various >components. These messages are only sent something like every 5 >minutes. So, they'll show up as messages that aren't necessarily one >time and done but they've got a very long interval between >transmission. If you have the means to check transmission interval you >might try that. Actually, I have captures from various Leafs on the >powertrain bus and I do have the means to check the interval so I'll >check and see if I can find messages that maybe don't get transmitted >so often. A validation message might only be every second or couple of >seconds. There's no need to spam the bus with serial number validation >every 10ms. Really, I didn't think there was any need to do it more >than once but maybe it really does. This whole business of component >validation is just plain annoying. Are chop shops really that big of a >thing or are the automakers just that DIY hostile? > >On Thu, Jan 26, 2017 at 4:33 AM, Tom Parker via EV <ev@lists.evdl.org> >wrote: >> On 24/01/17 23:25, Tom Parker via EV wrote: >> >>> On my car, there is only one frame that isn't repeated continuously >after >>> startup (0x603 is sent once, with a single byte payload which is 00 >in my >>> captures). >>> >>> I'll try disconnecting the 12v battery tomorrow and see if anything >>> different happens at when it's connected, or during the first >startup. >> >> >> I removed the 12V battery and there was no activity on the EV CAN bus >when >> it was reconnected. There were also no new messages when I turned the >car >> on, and other than 0x603, they all streamed continuously. I waited >quite a >> long time (10 minutes maybe) before reconnecting the battery. >> >> I guess this means the BMS authentication is in the repeating >messages, or >> it is triggered by some other event than disconnecting the 12V >battery, or >> you can have the 12V battery disconnected for a very long time >without >> breaking the BMS authentication. >> >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> Read EVAngel's EV News at http://evdl.org/evln/ >> Please discuss EV drag racing at NEDRA >(http://groups.yahoo.com/group/NEDRA) >> >_______________________________________________ >UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >http://lists.evdl.org/listinfo.cgi/ev-evdl.org >Read EVAngel's EV News at http://evdl.org/evln/ >Please discuss EV drag racing at NEDRA >(http://groups.yahoo.com/group/NEDRA) > >_______________________________________________ >UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >http://lists.evdl.org/listinfo.cgi/ev-evdl.org >Read EVAngel's EV News at http://evdl.org/evln/ >Please discuss EV drag racing at NEDRA >(http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
