[DATA] - HVBJB Mega Data Aggregation Thread

[BillPitman]

Voltage drop is proportional to resistance, so a higher voltage drop is bad. However the positive contactor voltage should always be less than the pack voltage, and the negative contactor voltage should rise above 0V. I’ll have to look at that on my car. Might be rounding errors or something. A good contactor in spec should always have a voltage drop less than 0.5V, 1.0V would be double spec and where I would get concerned.



The entire battery circuit is isolated from the chassis. The leakage resistance is the resistance between the battery circuit and the chassis. Normally it should be very high because nothing should be touching the chassis or it’s insulated. If there is a problem in the system somewhere such as a HV cable rubbing through, cell tabs touching ground, or moisture in the pack the resistance will go down, and the BECM will shut down the pack.

Todd had an isolation fault at the end and I theorize it may be because a contactor coil touched the contact plunger while energized. Coil insulation melting through could cause that.

Lee, please do check your 2 parameters, I have wondered why the contactor voltage was reading higher than system voltage… Bill

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[JohnFoxeSheets]

Looks like 8.5332 minutes is the most unlucky time!

Holds breath thinking, If I can just get past 512 seconds...! ?

 

[Ghost Ryder]

Do we know how much amp the car uses while cruising on the the highway at say 70 or 80 mph?

 

[DevSecOps]

Do we know how much amp the car uses while cruising on the the highway at say 70 or 80 mph?

That's really hard to say. Different trims vary, weight in the car, wind and weather resistance, cabin heating/cooling, incline or decline. There's so many factors that can affect the power draw. As you can see by my chart it's all over the place, but typically above 400A.

 

[Ghost Ryder]

Wow, and the contactor is only rated for 500?

 

[Jiji]

I'd like to update my MME trip/charge logger to include new data points that would allow me to see the current condition and the long term trend of the contactors that are susceptible to failing.

Here is a recap of my project from last winter. Basically I log the trip details which can be expanded to show location, vehicle, and environmental data points from the trip.

Looking at the BECM PIDs in OBDLink I see there are a few related to contactor voltages (+/-), contactor leakage voltages (+/-), and contactor leak resistances (and of course the various status and control PIDs for monitoring the contactors).

Anyone have a suggestion which of these might be useful to watch long term to see something before the SVS/SSN alerts appear? All but one of the resistances return FFFF which I take to be open, only the ContactorOverallLeakResistance PID returns a value in the megohms.

 

[DevSecOps]

September has been a rough month so far and we're not even 1/2 way through it. The RED colored boxes indicate SSN after the recall software was applied. GT's especially are looking more and more like they are doomed.

For those wondering why there's no data or limited data on the SSN DTCs, it's because those present themselves when the car is turned on and no snapshot is performed. Sometimes I can cross reference the time and get a little bit of data through other DTCs, but it's not really helpful because the actual welding took place sometime before the DTC is thrown.

 

[AKgrampy]

September has been a rough month so far and we're not even 1/2 way through it. The RED colored boxes indicate SSN after the recall software was applied. GT's especially are looking more and more like they are doomed.

Noooooooooooo! My wife retires from the local dealership tomorrow so when mine fails I guess I will be just another customer!

 

[DevSecOps]

Noooooooooooo! My wife retires from the local dealership tomorrow so when mine fails I guess I will be just another customer!

Find a mountain and go really fast up it ... hurry!

(I do not officially condone this behavior)

 

[AKgrampy]

Find a mountain and go really fast up it ... hurry!

(I do not official condone this behavior)

Been doing that nightly berry picking. Not that it means anything due to sample size but all failures in red are 2021 builds except for the odd post new HVBJB failure.

 

[EELinneman]

September has been a rough month so far and we're not even 1/2 way through it. The RED colored boxes indicate SSN after the recall software was applied. GT's especially are looking more and more like they are doomed.

For those wondering why there's no data or limited data on the SSN DTCs, it's because those present themselves when the car is turned on and no snapshot is performed. Sometimes I can cross reference the time and get a little bit of data through other DTCs, but it's not really helpful because the actual welding took place sometime before the DTC is thrown.

Todd, I think the MPH value is incorrect or perhaps should be KPH. My failure happened well below the value listed. It was a pretty congested route and I wish I had been able to go at the speed indicated. Great data though. It reaffirms my belief that with the GTs it not if, but when and where.

 

[Blue highway]

September has been a rough month so far and we're not even 1/2 way through it. The RED colored boxes indicate SSN after the recall software was applied. GT's especially are looking more and more like they are doomed.

For those wondering why there's no data or limited data on the SSN DTCs, it's because those present themselves when the car is turned on and no snapshot is performed. Sometimes I can cross reference the time and get a little bit of data through other DTCs, but it's not really helpful because the actual welding took place sometime before the DTC is thrown.

Soo I see a Motor type 3 above... what is that? Motor type 4 ER and type 3 SR?

• GTPE x 2 (Motor #7)
• GT x 5 (Motor #6)
• Non-GT AWD x 6 (Motor #5)
• Non-GT RWD x 1 (Motor #4)

 

[DevSecOps]

Todd, I think the MPH value is incorrect or perhaps should be KPH. My failure happened well below the value listed. It was a pretty congested route and I wish I had been able to go at the speed indicated. Great data though. It reaffirms my belief that with the GTs it not if, but when and where.

Correct, on some vehicles it is kph. On yours it said that the fault occurred at 133kph which is 82mph.

 

[EELinneman]

Correct, on some vehicles it is kph. On yours it said that the fault occurred at 133kph which is 82mph.

Interesting. That would have been the day before the message and power restrictions. The route from my house to my son's is always packed at the time I went I'm wondering if the failure happens well before the response by the software.

 

[DevSecOps]

Soo I see a Motor type 3 above... what is that? Motor type 4 ER and type 3 SR?

• GTPE x 2 (Motor #7)
• GT x 5 (Motor #6)
• Non-GT AWD x 6 (Motor #5)
• Non-GT RWD x 1 (Motor #4)

AWD SR Battery

And #2 is RWD SR

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