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bobkart
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Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 3:32 pm

ydrape wrote:
Wed Dec 23, 2020 1:50 pm
I had problem very similar to yours on a 2015 Leaf. See below the parts replaced and their cost I have found by part number on the web.
Hopfully, parts and labor passed on warranty in my case.

DTC U1000
DTC U110D
DTC P3195
DTC U1008

https://drive.google.com/file/d/1wsvIb2 ... sp=sharing

Good luck!
Thanks for that data point. I heard reference to some of those items today at the dealer . . . here's that story.

I paid $192.57 for the dealer's diagnosis. Something about replacing Intelligent Braking System modules and wiring harness ('mysterious short in the harness'). I haven't looked over the estimate yet, but the service advisor says it comes to ~$6K. Strongly advised not to drive it, with repeated questions along the lines of what do I want to do and do I have a tow lined up. I just wanted to settle up and get the car back, as I had a plan of attack.

Was all ready to go through the DTC Reset and battery disconnect/reconnect procedures. But the car fired right up (was on their L2 EVSE and was fully charged). The 12V battery had obviously been disconnected/reconnected. No dash icons other than one for Air Bag (which usually goes away when someone is sitting in the passenger seat).

I drove straight to Midas for a 12V battery load test. They say it failed the test, could only provide 238 amps (less than half the rated value). I'll be reaching out to Ohmmu soon. I haven't checked the DTCs yet.
Pearl White 2016 Leaf S, 24kWh battery
Silver Enkei Racing RPF1 16x7 Wheels
Ohmmu T12403 LiFePO4 12V Battery
Nissan All-Season Floor Protectors

ClipperCreek LCS-25P
2x REC 325Wp Solar Panels
10kWh LiFePO4 Battery Bank
BAFX OBD2 Reader, LeafSpy Pro

Thekuai
Posts: 45
Joined: Fri Oct 12, 2018 6:11 pm
Delivery Date: 13 Nov 2018

Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 3:44 pm

I think the load test is irrelevant for electric vehicles. You only need a very small amount of amps to engage the HV coontactors and the computers. You just need good voltage. Load tests are for gas cars with starters. It tests cranking ability which is the hardest task for gas 12v batteries. In fact you will often see CA or CCA ratings for batteries (cold cranking amps)

Leaf batteries are group 51r which are among the smallest, smaller than even Honda civics.

LeftieBiker
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Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 3:48 pm

Thekuai wrote:
Wed Dec 23, 2020 3:44 pm
I think the load test is irrelevant for electric vehicles. You only need a very small amount of amps to engage the HV coontactors and the computers. You just need good voltage. Load tests are for gas cars for the starters. It tests cranking ability which is the hardest task for gas 12v batteries.

Leaf batteries are group 51r which are among the smallest, smaller than even Honda civics.
The load test will show whether or not the battery can provide the 10 amps or so needed to start the car. That's much less than a starting motor needs, granted, but if the battery shows 12+ volts but can't cough up those 10 amps, the car won't start. That modest drain is enough to cause a sulphated battery that will still put out 12 volts to drop well below that voltage.
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.

Thekuai
Posts: 45
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Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 3:51 pm

LeftieBiker wrote:
Wed Dec 23, 2020 3:48 pm
Thekuai wrote:
Wed Dec 23, 2020 3:44 pm
I think the load test is irrelevant for electric vehicles. You only need a very small amount of amps to engage the HV coontactors and the computers. You just need good voltage. Load tests are for gas cars for the starters. It tests cranking ability which is the hardest task for gas 12v batteries.

Leaf batteries are group 51r which are among the smallest, smaller than even Honda civics.
The load test will show whether or not the battery can provide the 10 amps or so needed to start the car. That's much less than a starting motor needs, granted, but if the battery shows 12+ volts but can't cough up those 10 amps, the car won't start. That modest drain is enough to cause a sulphated battery that will still put out 12 volts to drop well below that voltage.
Yes but he said he took it to midas and they said it provided 238 amps, which is more than enough. I doubt 12v is the issue. His intelligent brake controller failed just like many of us here and its an expensive fix. My abs actuator was replaced as well.

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bobkart
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Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 4:40 pm

Thekuai wrote:
Wed Dec 23, 2020 3:51 pm
His intelligent brake controller failed just like many of us here and its an expensive fix. My abs actuator was replaced as well.
Thanks for your input. I get that EVs don't need to supply the same high current as is needed to start ICEVs. Still, if whatever battery you have isn't up to the demands that the LEAF booting up puts on it, these symptoms can arise. Ideally there's a test that can make that determination, but I suspect there's a lot of variability as to what that requirement is, explaining the difficulty often seen in reproducing the symptoms caused when the battery doesn't measure up.

I'd be interested to hear whether you think my intelligent brake controller having failed would still allow me to drive the car normally. Not a snide question, just trying to understand if there is such a failure mode. Because it's working as well as it ever has, from all the indications. Regen started at zero bubbles (was at 100% SOC), then gradually the bubbles appeared as the charge wore down on the way to Midas. Lifting off of the accelerator continues to do the same thing it did before this failure (slow the car down and light up Regen bubbles). Light braking will move deeper into Regen (I think, will check that again more closely later today).

I checked the DTCs. There's one that won't go away with just the Reset DTC of Leaf Spy Pro (besides the AIR BAG code, which could also be due to 12V flakiness):

Image

Just after the Reset DTCs it rereads them, and the code is gone then, but on a refresh it comes back. I've yet to go through battery disconnects/reconnects to try harder to reset it (and probably won't until the end of the month, as I like to accumulate my stats on a per-month basis).
Pearl White 2016 Leaf S, 24kWh battery
Silver Enkei Racing RPF1 16x7 Wheels
Ohmmu T12403 LiFePO4 12V Battery
Nissan All-Season Floor Protectors

ClipperCreek LCS-25P
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ydrape
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Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 5:42 pm

Do you hear this noise when you press the brake pedal?

https://www.youtube.com/watch?v=3SCwORR3qbQ

If you can't get rid of this noise by clearing the DTC, the problem is persistent and render the car hazardous to drive in my opinion.

Nissan know very well this problem and has proceeded to a recall. You may try to have the car repaired at Nissan expense.
2015 SL Leaf made 03/2015
purchased used May 2017; 12/12 bars
Sts Bat: aHR = 58, SOH = 93% Hx = 89%

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bobkart
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Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 5:42 pm

Image
Pearl White 2016 Leaf S, 24kWh battery
Silver Enkei Racing RPF1 16x7 Wheels
Ohmmu T12403 LiFePO4 12V Battery
Nissan All-Season Floor Protectors

ClipperCreek LCS-25P
2x REC 325Wp Solar Panels
10kWh LiFePO4 Battery Bank
BAFX OBD2 Reader, LeafSpy Pro

User avatar
bobkart
Forum Supporter
Posts: 147
Joined: Sat Dec 22, 2018 12:17 am
Delivery Date: 14 Dec 2018
Leaf Number: 307853
Location: Pacific Northwest
Contact: Website YouTube

Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 5:47 pm

ydrape wrote:
Wed Dec 23, 2020 5:42 pm
Do you hear this noise when you press the brake pedal?

If you can't get rid of this noise by clearing the DTC, the problem is persistent and render the car hazardous to drive in my opinion.

Nissan know very well this problem and has proceeded to a recall. You may try to have the car repaired at Nissan expense.
Hi again, that's the video I snagged a dash image from to show the lit icons in an earlier post of mine (thanks!).

Yes, that's the noise I was getting when the failure occurred. All is well now from a behavior standpoint; I just took another trip, and Regen works as expected, including increasing the bubbles on a gradual downhill by lightly applying the brakes.
Pearl White 2016 Leaf S, 24kWh battery
Silver Enkei Racing RPF1 16x7 Wheels
Ohmmu T12403 LiFePO4 12V Battery
Nissan All-Season Floor Protectors

ClipperCreek LCS-25P
2x REC 325Wp Solar Panels
10kWh LiFePO4 Battery Bank
BAFX OBD2 Reader, LeafSpy Pro

Thekuai
Posts: 45
Joined: Fri Oct 12, 2018 6:11 pm
Delivery Date: 13 Nov 2018

Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 6:04 pm

bobkart wrote:
Wed Dec 23, 2020 4:40 pm
Thekuai wrote:
Wed Dec 23, 2020 3:51 pm
His intelligent brake controller failed just like many of us here and its an expensive fix. My abs actuator was replaced as well.
Thanks for your input. I get that EVs don't need to supply the same high current as is needed to start ICEVs. Still, if whatever battery you have isn't up to the demands that the LEAF booting up puts on it, these symptoms can arise. Ideally there's a test that can make that determination, but I suspect there's a lot of variability as to what that requirement is, explaining the difficulty often seen in reproducing the symptoms caused when the battery doesn't measure up.

I'd be interested to hear whether you think my intelligent brake controller having failed would still allow me to drive the car normally. Not a snide question, just trying to understand if there is such a failure mode. Because it's working as well as it ever has, from all the indications. Regen started at zero bubbles (was at 100% SOC), then gradually the bubbles appeared as the charge wore down on the way to Midas. Lifting off of the accelerator continues to do the same thing it did before this failure (slow the car down and light up Regen bubbles). Light braking will move deeper into Regen (I think, will check that again more closely later today).

I checked the DTCs. There's one that won't go away with just the Reset DTC of Leaf Spy Pro (besides the AIR BAG code, which could also be due to 12V flakiness):

Image

Just after the Reset DTCs it rereads them, and the code is gone then, but on a refresh it comes back. I've yet to go through battery disconnects/reconnects to try harder to reset it (and probably won't until the end of the month, as I like to accumulate my stats on a per-month basis).
It will still allow you to drive normal otherwise. The brake will still somewhat work with increased effort and pedal travel. You will just look like an amateur

Thekuai
Posts: 45
Joined: Fri Oct 12, 2018 6:11 pm
Delivery Date: 13 Nov 2018

Re: Brakes Fail upon Powering On

Wed Dec 23, 2020 6:09 pm

ydrape wrote:
Wed Dec 23, 2020 5:42 pm
Do you hear this noise when you press the brake pedal?

https://www.youtube.com/watch?v=3SCwORR3qbQ

If you can't get rid of this noise by clearing the DTC, the problem is persistent and render the car hazardous to drive in my opinion.

Nissan know very well this problem and has proceeded to a recall. You may try to have the car repaired at Nissan expense.
Is the recall released yet? I paid out of pocket and I'm wondering if I can be refunded

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