nlspace
Posts: 203
Joined: Mon Jun 05, 2017 10:21 pm
Delivery Date: 06 Jun 2017

Re: 2012 Leaf Charging Problem

Fri Sep 20, 2019 12:41 pm

i was having a starting problem with failure to go to READY even with jump-starting from a good running car at 14 V.

A weak, old or worn out 12-volt battery can cause issues during charging. There are a multitude of relays and contactors which must be properly sequenced for charging the pack. If the 12V lets go for some reason, then relay contacts can be welded, or arc and frost the contact faces such that they no longer function properly.

There are high currents flowing in the boost transformers of the OBC, and if the current path suddenly goes open circuit, then a high voltage discharge will occur that can damage the diodes and IGBTs of the boost stage located in the epoxy-coated plate bolted to the liquid-cooled heatsink.

i don't know if the FSM has procedures to troubleshoot the main contactors and relays, but worth checking into this.

Good Luck and keep us posted on your findings.

95eagle
Posts: 20
Joined: Sun Jul 14, 2013 1:16 pm
Delivery Date: 14 Jul 2013
Location: Maryland

Re: 2012 Leaf Charging Problem

Fri Oct 11, 2019 4:35 pm

Finally found and purchased a used 40,000 mile charger off eBay for $500. Installed and car now charges as always.

A learning process. In trying to follow the Service Manual, led me to disassemble a few things which did not need disassembly. All in all it is a doable job for most anyone if one has access to a lift. Six hours from start to finish.

net0drive
Posts: 2
Joined: Wed Nov 20, 2019 5:22 pm
Delivery Date: 21 Nov 2019
Leaf Number: 021276
Location: SF Bay Area

Re: 2012 Leaf Charging Problem

Fri Nov 22, 2019 10:54 pm

Hi folks - 2012 and I have the same issue as 95eagle - or so it seems.
Been charging with the GE EVSE for about 18 months with no issues. Recently it gave us the red warning light a couple times but after about 4 tries it charged. A few days later - no charging on L2. Tried the factory L1 cord, and same thing: It acts like all is well, but after about 12 seconds, it simply shuts off. DCFC works fine of course.
I get 4.3 V on the prox pin but I get infinite ohms on the pilot wire to ground both ways.
I removed the top circuit board from the OBC, hoping to find a blown diode that was obviously causing the open circuit, but I don't see any obvious damage. Tomorrow I will perform a careful test of the cord from front to back to rule that out.
Anyone have any techniques to share that will enable me to determine what component on the OBC board might be gone? I have a decent meter but no O-scope.
I didn't pay a lot for this car so I would feel a bit nutty dropping a grand on a new OBC - especially from an earlier model - it might be the GE EVSE that caused this issue after all. Is there a way to hack the EVSE to make it not check the prox or pilot wires? Would that cause an overcharge? or simply not charge?
Thanks all!

seebrentrun
Posts: 3
Joined: Mon Jan 06, 2020 11:04 am
Delivery Date: 01 Jan 2015
Leaf Number: 026229

Re: 2012 Leaf Charging Problem

Mon Jan 06, 2020 12:49 pm

My 2012 LEAF has the same issue, leading to a bad OBC diagnosis. I want to replace the OBC myself and am in need of an OBC replacement guide or tutorial. Does anyone have a suggestion?

Lothsahn
Posts: 648
Joined: Thu Apr 05, 2018 4:35 pm
Delivery Date: 04 Jan 2018
Leaf Number: 007797

Re: 2012 Leaf Charging Problem

Mon Jan 06, 2020 3:45 pm

seebrentrun wrote:
Mon Jan 06, 2020 12:49 pm
My 2012 LEAF has the same issue, leading to a bad OBC diagnosis. I want to replace the OBC myself and am in need of an OBC replacement guide or tutorial. Does anyone have a suggestion?
Get the Leaf Service Manual. It has detailed steps on replacing the OBC. It's not easy, but not the hardest thing ever. If you just have a failed diode with infinite resistance, you can charge with the L1 OEM charger. In that case, I'd recommend wiring a diode in the charging port as a workaround. That's far easier than disassembling the OBC. And if you have a GE wattstation EVSE, throw it away.

In 2011/2012, the OBC is located under the rear seat, so you have to remove the rear seat, and it has coolant lines you have to detach and reconnect.

See the video on this page:
https://evsenhanced.com/services/on-boa ... e-updates/
2011 Silver SV, purchased 2018, lives in Missouri (previously in CA)
LeafSpy Pro + BAFX Products OBDII dongle
Battery swap 2019/04/24 (87% SOH, 12 bar)

seebrentrun
Posts: 3
Joined: Mon Jan 06, 2020 11:04 am
Delivery Date: 01 Jan 2015
Leaf Number: 026229

Re: 2012 Leaf Charging Problem

Wed Jan 08, 2020 9:55 am

Much appreciated Lothsahn.

seebrentrun
Posts: 3
Joined: Mon Jan 06, 2020 11:04 am
Delivery Date: 01 Jan 2015
Leaf Number: 026229

Re: 2012 Leaf Charging Problem

Sun Jan 12, 2020 3:56 pm

My 2012 LEAF doesn’t charge on Level 2 or Chademo. Does failure to charge on Chademo mean this isn’t an OBC issue, and/or can’t be corrected with the diode fix?

The battery was replaced in 2016 and the car has full capacity, so I really want to get this charging issue resolved. I thought Chademo bypassed the OBC, but the car won’t charge on quick charger.

LeftieBiker
Moderator
Posts: 15030
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: 2012 Leaf Charging Problem

Sun Jan 12, 2020 6:38 pm

The OBC is bypassed as a charger, but still communicates with the charging station for DCFC sessions. So the OBC is likely the location of whatever is malfunctioning.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

nlspace
Posts: 203
Joined: Mon Jun 05, 2017 10:21 pm
Delivery Date: 06 Jun 2017

Re: 2012 Leaf Charging Problem

Sun Jan 12, 2020 8:01 pm

@ leftie, please don't post your guesses about stuff that you don't really know or understand. Please delete your post, it does not help to send folks chasing your guesses about the BMS or the unheard of charging control subsystem (?) Are you just making this stuff up?

The OBC is definitely involved in Chademo charging and provides the communications interface for the port. There are pictures of this in the Engineering section of the forum.

viewtopic.php?f=8&t=3010&start=220#p537400

Without the CAN commands the Chademo will not work.

LeftieBiker
Moderator
Posts: 15030
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: 2012 Leaf Charging Problem

Sun Jan 12, 2020 8:23 pm

I'll reword what I wrote. The OBC is bypassed as a charger, but still communicates with the charging station for DCFC sessions. I had in fact forgotten the location of the control circuits in question. I will also note that your post would not have achieved this with a more typical web poster. Polite requests are more likely to be honored.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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