reprogramming, mdi2 and SPS-2 questions

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lesmiserah

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Hybrid battery pack 236v
Hybrid battery terminal 12.8v
Hybrid battery 1-20 range from 13.5v to 11.2v
Hybrid battery SOC 58%
contactor sys req ckt 70%
 

BG1988

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Hybrid battery pack 236v
Hybrid battery terminal 12.8v
Hybrid battery 1-20 range from 13.5v to 11.2v
Hybrid battery SOC 58%
contactor sys req ckt 70%
Check the transmission for a backed out harness connector or damaged harnesses at the brake peddle area let me get the TSB for it

There is also a large harness connector on the HV battery inspect pins for corrosion ...
 

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BG1988

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ouch so the engine ecm had issues and needed replaced too. man that's some bad luck. these have a odd ball ecm too from what I remember. 67A or something. probably wasn't easy to find.


but that solved all the sensor issues on engine side?
there's a tsb somewhere about grounds on some gm cars and trucks, and these were included in the years I believe. so much. going wrong all at one always makes me think grounds.

hopefully you get it fixed. only down side to these trucks is it even if it's a simple repair, jumping thru hoops with shops and dealers make it feel like a nightmare.

I can't find the grounds tsb, I thought I had it saved. but if you don't have it, this might help with the diagnosis process for the hybrid stuff. I believe it's posted here in other threads too.
i got the PDF files on the ground wire locations most of them are on the frame rail..
 

j91z28d1

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man you're definitely in deep.

over my head too, but what was the mileage and year of the battery pack before all this stated?

236v sounds crazy low. how are you getting that voltage? from the scanner or from a volt meter at the pack. I'd check at the pack with a volt meter and see if they match. my pack is like 320v.

the under hood inverter cover has a jumper on it. since it's missing, need to jump that with something for it to start.

the under hood noise that kills the 12v. can you find out what that noise is coming from? that's sounds bad. is the battery getting hot from the high drain?

I can look up some wiring diagrams for you if you have something specific you need to check, but also for like 30$ you can buy a one vehicle access on the nonpro side of prodamand software. gives trouble trees to follow and research for each trouble code you have. it should atleast help get a handle on how the system works.

with the scanners you have, you should be able to do jump assist mode, that's where you put a battery charger on the 12v and it puts it in a mode that tries to charge the hybrid battery. it won't do that without using the scanner. I've not done it, but it's a bit of drawn out process.
 
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lesmiserah

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I got the voltages threw from the battery control module with Tech2. I believe its the original battery from 2011 with 200k miles on it. Some other things that i've learned. Tech2 has real time monitoring of the battery voltage. So with the HVBattery at 233v and the 12v at 11.8 with 3 percent charge I left the charger on over night. When I work up they were at 336v and 12.4 at 57%. A few hours later at 339v and 89% I turned the ignition key on. The box next to the 12v battery and radiator began to hum and the 12v battery began to lose charge. I checked it a few minutes later and they were at 248v and 12v was at 4%

I disconnected the battery, charged the 12v 80%, reconnected it and hit the ignition. The car rolled over and fired maybe 4 times then stopped. I checked and it had dropped back to 331v and 12v 40%. The 12v batter loses no charge when not hooked up to anything. it sat around unhooked for a month with no noticeable loss. I have not directly stuck a multi meter on the battery itself though.

Here is the read out for the battery
 

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