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Can someone explain why the battery voltage is so critical at the time of programming with these tuners? It seems there is a fine window of not too low or not too high, why is this? I've also read that funny things can happen if it is not right. Is it a tuner thing or does it have something to do with the ECM? Just seems if there is enough juice to run the electronics and start the truck that that would be enough for the time it takes to load a program?
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@Double R Diesel would know. He runs into this.
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My understanding that the way these tuners flash the ecm, if voltage was below a threshold then certain things would skipped over and not programmed in. It does take a certain voltage to allow the ecm write and basically if the system senses voltage is running low it skips over the fine details and merely loads enough to prevent bricking the ecm...which leads to a funky operating truck if this happens.
However too much voltage during a flash can fry the ecm too.
The safest bet is too have good batteries in your truck and run it to operating temperature before you program your truck. No battery chargers or jumper cables or such if you are unsure of what you're doing. Maybe just unhook the cables off your batteries to where you can check the voltage independently of each battery. If both hold a good 12 volts, then you will be fine. If one shows 12 volts and the other 11 volts, then I would be careful because one bad battery can ruin the mix.
Ray
Double R Diesel, LLC
www.doublerdiesel.com
The Cummins Whisperer!John 3:16, Romans 10:9-10...Tuning for the Heart and Soul.
Thanks for you replies, knowledge is a good thing!
Once again Ray is the answer man awesome input from RayOriginally Posted by Double R Diesel
2012 Cummins Ram 6.7L MM3 tuner full 5" Flo Pro TBE Exhaust LWBCC 4x4 Mag Hytec Double Deep Transmission Pan , Mag Hytec Rear Diff Cover
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Agreed!
Low voltage to the ECM can scramble the logic.
2003- 3500 RWD Automatic. S & B intake, BD Intercooler, Pusher Air Horn, MM3 Double R Tuning, Turbo Timer, electric Flex-a-lite fans, FASS 95, 50 HP tips, upgrade to 351 turbo, 3.42 gears, Twin air compressors, air bags, Remote dual oil filters, Hellwig sway bar, Front Winch. Home made Fuel Heater, BD Exhaust brake with Torque Lock. Tons of TLC
Learned something new today Thanks Ray
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