Allowable system voltage requirements for flash

Jaime Diagnostician Ocala, Florida Posted   Latest   Edited  
Discussion
Programming
Will Not Flash

I tried to find the conversation that took place recently where someone asked "What's the correct voltage to maintain on a vehicle during a Flash?" but wasn't able to locate it.

(Hey Scott, got a search function planned?) (Or do I need to watch the "HELP" videos again?) (Was it even on Diag​nostic Network)

Anyway, my reason for the search was to share something I just came across to support my answer of "It depends on the vehicle". I'm preparing to reprogram the TCM on a 2015 Chrysler 200 and came across a TSB which states:

"NOTE: Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow the charging voltage to climb above 13.5 volts during the flash process".

Now, I don't know about you, but that's a DAMN SMALL window in which we are supposed to maintain system voltage. 13.2, 13.3, 13.4 or 13.5 VDC are acceptable, nothing else. Consider the fact that during the process several solenoids will be activated, as will most likely the radiator fans, etc. Unless your maintainer can be programmed, and can respond immediately to changes, I would think it close to impossible to keep it where they want it.

I've been known to turn accessories on in order to bring down (what was said to be) excessive voltage while programming, and those techniques work - providing you get set up before flashing. However, I think maintaining such a small window might be impossible to maintain without some really expensive tooling.

End of rant, beginning of a suggestion for a new Diagnostic ​​Network forum: "Proper Programming Voltage - Searchable". Let my post be the first entry ;-).

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Louis Diagnostician
Claremont, California
Louis
   

Good morning Jaime. I believe this is the post you might be looking for. I just typed "programming" into the search bar. Had to go a ways down the page to find it.

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Jaime Diagnostician
Ocala, Florida
Jaime
 

Thanks Louis. Although that article was informative, it's not the one to which I was referring. Someone actually posed the question about proper voltage. I'm thinking now it may have been in a different forum. BTW, on my Diag​.​net page, I don't see a search bar.

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Michael Mobile Technician
Clinton, Utah
Michael
 

Jaime, In addition to your observation, the voltage on the stable power supply is going to be higher than what the module sees. There are multiple fuses and connections before getting to the TCM. That may drop the voltage a few tenths of a volt. Most of the time on Domestic and Asian vehicles I set to 13.5V. On Euro vehicles 14.5. I have never had a failure programming when doing this.

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Scott Manager
Claremont, California
Scott
 

Hi Jaimie, The search button is located here.

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Jaime Diagnostician
Ocala, Florida
Jaime
 

Ahhh. Thanks Scott! Not a bar at all, which is what I was (ahem) searching for. ;-) .

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Bob Owner/Technician
East Longmeadow, Massachusetts
Bob
 

I think that button needs a bit of enhancement. I also had trouble finding it in the past until you pointed it out to me. It's not very intuitive.

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Jaime Diagnostician
Ocala, Florida
Jaime
 

Thanks Bob. I don't feel as badly anymore (lol).

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Keith Diagnostician
Collinsville, Oklahoma
Keith
 

Jaime, the topic was asked and discussed on the book of faces. My mobile device is not letting me paste the link into the hyperlink address bar, so i just pasted the text link here. Scott could you look into that, im on a galaxy s9 using latest chrome browser, thanks. m​.​facebook​.​com/groups/1192799…

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Jaime Diagnostician
Ocala, Florida
Jaime
 

Thanks Keith. It's hard (at my age) to keep these straight - LOLOL

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Geoff Diagnostician
Lahaina, Hawaii
Geoff
 

Keith beat me to it, and he had the best answer EVER, in that discussion. I am actually rather surprised after wondering about this topic for many years why Drewtech doesn't have a handy chart on their website. It would probably save them 50 phone calls per day.

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Jaime Diagnostician
Ocala, Florida
Jaime
 

Geoff, while working at the dealerships, I often wondered WHY some recalls we performed, were even initiated. I mean, there were some DOOZIES, that seemed to have nothing to do with safety or emissions, yet the cars were brought back to us to have "Sump-in-or-another" done to them. One of the older guys there explained that's how the dealer gets more customer pay work. Now, I wonder if some

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Geoff Diagnostician
Lahaina, Hawaii
Geoff
   

Perhaps our best hope is a rogue disgruntled ex-call center employee releasing all of his secret notes. hahahaha ps, I thought I had your resume memorized with USN and working for Steve B and Vetronix​.​​.​​.​​.​​.​ when/what dealers were you with? email me, if you want, instead of posting. My dealer experience was Porter at Hyundai, in High School :-)

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