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 Post subject: Flat/Dead Battery
PostPosted: Sat Jun 20, 2009 2:52 pm 
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TO4

Joined: Sun Jun 14, 2009 1:46 pm
Posts: 234
Car: 200sx S14.5
hey guys,

i was just wondering, if my battery were to go flat, or die while my car is stationary in my garage cos it's not a daily driver

would my powerfc lose all of its memory and then when i try to start the car up, it wont ?


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PostPosted: Sat Jun 20, 2009 3:10 pm 
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T04 Hybrid
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Joined: Tue Oct 18, 2005 7:31 pm
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Car: s15
No

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PostPosted: Sat Jun 20, 2009 3:22 pm 
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TO4

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Car: 200sx S14.5
then how does the pfc hold power and memory ?


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PostPosted: Sat Jun 20, 2009 6:56 pm 
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T04 Hybrid
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It has memory,NVRAM, which immediatly stores information when there is no power. Much like a PC

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PostPosted: Sat Jun 20, 2009 8:41 pm 
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Joined: Mon Feb 03, 2003 10:19 pm
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like a PC how? it has very little NVRAM, it had a hard disk (or more) and RAM :P

anyway, the NV stands for Non Volatile which means that it doesnt need power to keep its memory.

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PostPosted: Sat Jun 20, 2009 9:17 pm 
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T04 Hybrid
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So explain to me how, when my car stood in a panel beaters for 3 months with the battery disconnected,that, when it was finally hooked up it had not lost its tune. (PFC)

BTW I was useing PC as an analogy.

And I know what NVRAM means( ( its the name used to describe any type of random access memory which does not lose its information when power is turned off.)

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PostPosted: Sat Jun 20, 2009 10:45 pm 
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TO4

Joined: Sun Jun 14, 2009 1:46 pm
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Car: 200sx S14.5
hey that's some interesting stuff, so now im not afraid to leave the car dead for a bit while i do some upgrades


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PostPosted: Sun Jun 21, 2009 11:55 am 
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i cant explain to you why yours lost its memory, maybe there was a wiring difference? maybe your car used to be auto? could be a million things.

and the explanation was for rk2k9's benefit, i only assumed you knew what the NV stood for as you even know that NVRAM existed lol

maybe the PFC doesnt have NVRAM! its possible there is a battery in there, or a few capacitors that keep the memory going while there is no battery hooked up to the car

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PostPosted: Sun Jun 21, 2009 2:14 pm 
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T04 Hybrid
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I based my answer on information from the Power FC manual (Page13) which states"Removing the ignition key or battery terminal will NOT affect the memory data" and my own personal experience,hence my answer.

I did say that my Power FC had NOT lost its memory whilst the battery was disconected.

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PostPosted: Sun Jun 21, 2009 2:39 pm 
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T03 Hybrid
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Location: Sydney
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sorry to hijack your thread but just on topic, when i jumpstart my battery is causes a voltage spike which resets my Haltech ecu, i this a common problem with all ecu or is my one just faulty?

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PostPosted: Sun Jun 21, 2009 3:58 pm 
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sorry rusty i misread your original post. i read over the 'not' par of it

sorry about that!

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PostPosted: Sun Jun 21, 2009 6:52 pm 
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No worries,I was trying to answer rk2k9 question as simply as possible without it getting to complicated :wink:

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PostPosted: Fri Jun 26, 2009 6:51 pm 
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Car: 180SX
Dunno if this relates or not cos I'm about to talk about SAFC and stock ECU

First of all why don't stock computers don't lose settings? I don't see a reason why should A/M computers do so...

My battery was dead for 3 months and SAFC had it's settings in it. Also when I bought it the guy said it was lying around for 6 months and his settings were still there.

I'l ask my electrical guru mate tonight, maybe he knows

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PostPosted: Fri Jun 26, 2009 7:07 pm 
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Joined: Mon Sep 08, 2003 11:21 pm
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std ecu is running from factory set rom settings,not a flashed eeprom,which also shouldn't lose memory without power. only ram dies without power.


as for putting a voltage spike through a haltech,that's an awesome way to kill it very quickly. at least use some decent leads with surge protection if you must jump start it from a running car...


Justin...

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PostPosted: Mon Jul 05, 2010 2:11 pm 
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Joined: Sun Nov 30, 2008 1:41 pm
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Lmaoooo It's bad enough jumping an efi car but when u spend 2k on the computer and getting it wired I'd think that's the first thing you would want to save


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