tomcat

If its anything like the GM stuff the dealer will then ask the question - why does this car have no history in the computer from x date ????? , they wanted to void my warranty with that one :(

 

ianmcginley

battery went flat? accidently shorted the battery while jumpstarting? blah blah :)

pick something like that.

Ask them why it happened, they are the service centers...

__________________
Falcon Killer (if you believe what Ford Service Departments have to say about me)
AU II XR6 - October 2001 ~ December 2002 - RIP
BA XR6 - December 2002 ~ Soon to disappear if Ford CRC can't fix it....

45,000km service coming up - and i'll be asking for a sizable list of fixes:
* Gearbox (3rd time)
* Steering click (5th time)
* Brake Shudder (2nd time, and has the applied "Fix")
* etc...

tomcat

That sort of thing doesnt affect keep alive memory :( , but then if you are modifying your car and keeping mods to a safe level then you assume responsibilty for your actions , in the end I got it repaired myself

Dev@SCT

Yes it does. Disconnect the battery and KAM goes away.

D.

FordACE

Well at least we have a straight answer to this question, for the Ford side anyway. Is that perhaps different on the GM side of things. It's not impossible to have these codes stored in a non-volatile memory, ie won't be erased unless someone reflashes the ecu??

boreded

Surely ford is not that stupid? I would think that the ECU even after a disconnecting the battery or uploading the stock tune back into the PCM would maintain some sort of "last modified" date?

So while the stock tune might be there, and even keep alive memory erased, your telling us that the Factory ECU will not keep any record of the date/time you put the stock tune BACK on?

Jabba

That is correct. Well so I am led to belive.

boreded

That's what I was getting at. A 100% confirmed answer from the developers is required here. I mean the SCT guys, not the people selling the product to us (ie CAPA)

Rollin

which dealer did that? i reckon they were talking out their asses. all gm computers either only store the actual DTC (for instance BCM "DTC 18 - serial data BUS fault") or the DTC and some operating conditions it occured in, ie: coolant temp, throttle position, engine revs, vehicle speed, time from start etc, and it tells you how many times it has happened from when it first reconised the fault till now, and in how many ignition cycles ie "times occured - 8, ignition cycles 75" up to a counter of 255 cycles.

you can flash them all you like, there is no function in the computer with any kind of date stamping at all. some codes are volatile (they go away with the battery disconnected) but others are kept and can only be cleared by using the proper scan tool (GM uses a "Tech 2" for VT onwards, and "Tech 1" for cars older than that)

KAM goes away on purpose so you can re-set the computer once work has been performed, for instance, if a car had a dribbly fuel injector and the computer learned from looking at the 02 sensors to lean out one bank, so it was running, say, 20% less fuel to get the closed loop a/f ratio "correct" then you replaced the faulty injector, it would take 100 ignition cycles at least to get the computer to 'learn' that the fault had been fixed. disconnecting the battery means the computer starts from factory specs from the word go.

i dont believe there would be any need to flash the factory code back into the computer before servicing etc, because the diagnostic equipment will not be able to tell the differnce. if you have a driveability problem and it sets a code, you fix the faulty component. if there is no code then its the tune that is the problem and you need to take it to your tuner, not ford.

all a flash tuner does is change the ROM on the chip - the actual way the computer works or calculates fuel and spark requirements is unaffected.

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Dev@SCT

Yes, that is what I am telling you.

D.