nlspace
Posts: 239
Joined: Mon Jun 05, 2017 10:21 pm
Delivery Date: 06 Jun 2017

Gradual Capacity Loss (GCL)

Tue Nov 19, 2019 9:59 am

In the FSM there is discussion about the capacity gauge on the dash and the meaning of bars and how they change. This thread is to collect and investigate the available information about the gradual capacity loss signal.

Both the charge level and a capacity level of the pack are transmitted over the CAN buss to the combination meter
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The capacity level can change based upon gradual capacity loss

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And the charge level can apparently change based upon temperature
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Last edited by nlspace on Tue Nov 19, 2019 10:01 am, edited 1 time in total.

nlspace
Posts: 239
Joined: Mon Jun 05, 2017 10:21 pm
Delivery Date: 06 Jun 2017

GCL signal on the CAN buss

Tue Nov 19, 2019 10:01 am

The Lithium Battery Controller (LBC) has a fault code related to Gradual Capacity Loss.

This is DTC P33D4

Image

nlspace
Posts: 239
Joined: Mon Jun 05, 2017 10:21 pm
Delivery Date: 06 Jun 2017

Lithium Battery Controller (LBC)

Tue Nov 19, 2019 10:36 am

The LBC sends data items related to the battery pack to the Vehicle Control Module (VCM) over the CAN buss, including this GCL signal.

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nlspace
Posts: 239
Joined: Mon Jun 05, 2017 10:21 pm
Delivery Date: 06 Jun 2017

Gauge segments information

Tue Nov 19, 2019 1:09 pm

Some additional information about reading the gauges

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The temperature gauge also uses the GCL signal:

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The power and regen power levels for the power bubbles:

Image

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Astros
Posts: 170
Joined: Wed Oct 11, 2017 11:21 am
Delivery Date: 28 Apr 2018
Leaf Number: 310136
Location: Seattle, WA

Re: Gauge segments information

Tue Nov 19, 2019 2:06 pm

nlspace wrote:
Tue Nov 19, 2019 1:09 pm
The temperature gauge also uses the GCL signal:

Image
Thanks for posting this! I was very interested to see the official mapping of battery temperature bars to temperature. It looks a lot like many of us have guessed, but I haven't seen anything official before. I assume this will be the same for later Leafs (this manual is for 2012, correct?), but I wonder if @DaveinOlyWA or others have any thoughts on this?
2019 Deep Blue SL Plus

cwerdna
Posts: 11328
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: GCL signal on the CAN buss

Tue Nov 19, 2019 2:47 pm

nlspace wrote:
Tue Nov 19, 2019 10:01 am
The Lithium Battery Controller (LBC) has a fault code related to Gradual Capacity Loss.

This is DTC P33D4
I do wonder when that trips. I've seen pics of several vehicles that are 9 bar losers.

'19 Bolt Premier
'13 Leaf SV w/premium (owned)
'13 Leaf SV w/QC + LED & premium (lease over)

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

arnis
Posts: 1026
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Gradual Capacity Loss (GCL)

Sat May 16, 2020 6:06 am

These are not like "somewhere in the middle" ranges.
I can confidently state that jump from 3 to 4 stars happen exactly when first sensor hits 5*C, and from 4 to 5 when first hits 15*C.
And from 5 to 6 also near 25*C.
So it appears that if temperature EXITS from the range, it switches to next one. But it holds on for as long as possible.
I've not observed in other direction. Likely these "ranges" are margins and arrows show "for how long it will stay in that bar state.
But there is some discrepancy below negative temps. Those bars change differently. So not sure what's happening there.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

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