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Old 08-14-2018, 07:05 PM   #176
rsandman
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Default EPROM vs EEPROM

Being the OCD type that I am, I feel the need to point out EPROM vs EEPROM
The ECU most likely uses an EEPROM as it is Electrically Erasable thus allowing the AP to make changes. An EPROM , as stated, is erasable with UV light.

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Originally Posted by buck22 View Post
To start off, I'll offer this disclaimer: I am not an ECU expert, nor have I ever been inside one. The following is meant to provide some clarity on technology, and is based on my own assumptions. It should be taken with a grain of salt.

Your ECU:

The ECU in your car likely uses a basic EPROM (Erasable Programmable Read Only Memory). The most notable application of this technology is to store the BIOS (Basic Input/Output System) for your PC. This is essentially what determines which ports are what, such as PCIE/USB/SATA/etc., along with basic operating parameters such as CPU clock speed and voltage, memory speed and voltage, etc..
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Last edited by rsandman; 08-14-2018 at 07:14 PM.
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Old 04-17-2019, 05:12 PM   #177
konaid
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Quote:
Originally Posted by Cobb Tuning View Post
There is a lot of rumour and concern about this issue and the bottom line is that we have never found this to be true. There is no stored data in the Subaru ECU that the dealer can see to show that the ECU was ever flashed. There is no "black box" or recorder that the dealer can look at and say "AHA! You have a flash!". We have been inside these ECUs probably more than most folks and we just cannot find any evidence for this at all. I have a feeling this is something that some service writers tell people who purchase these cars as a sort of boogy man. You should use your AccessPORT with confidence and if you uninstall the AccessPORT your ECU is back to 100% stock.

Travis
COBB Tuning
I recently heard that there is a way for the Dealer to tell history of RPMs/mileage to basically deny warranty claims on engines, saying the break in procedure was not followed. Is this total crap or is that possible. Asking for a friend with a 14
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Old 04-18-2019, 03:29 PM   #178
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Originally Posted by konaid View Post
I recently heard that there is a way for the Dealer to tell history of RPMs/mileage to basically deny warranty claims on engines, saying the break in procedure was not followed. Is this total crap or is that possible. Asking for a friend with a 14
No, that's ridiculous. That's a lot of data the ECU would need to store, not to mention the manual explicitly says "except in an emergency" multiple times, and there's no way a log can show what's an emergency and what's not.
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Old 04-18-2019, 04:07 PM   #179
konaid
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pretty sure i saw this on a claims denied thread. Not sure how deep into it was.
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Old 04-18-2019, 04:07 PM   #180
konaid
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I am just going to wait until june, see if that CA suit passes, and then mod from there. Or I will give up on waiting and make y car run better and live with it.
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Old 04-30-2019, 04:55 PM   #181
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Originally Posted by konaid View Post
pretty sure i saw this on a claims denied thread. Not sure how deep into it was.
A dealer once told me that the fin on the wipers that keeps them in contact with the glass at speed was a snow scraper.

Would take a lot of storage to hold all the data, a crapload of time to review it, and a lot of assumptions considering the data wouldn't tell you if there were emergencies, or who was driving the vehicle.

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Originally Posted by konaid View Post
I am just going to wait until june, see if that CA suit passes, and then mod from there. Or I will give up on waiting and make y car run better and live with it.
What suit?
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Old 05-07-2019, 11:35 AM   #182
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Quote:
Originally Posted by Cobb Tuning View Post
There is a lot of rumour and concern about this issue and the bottom line is that we have never found this to be true. There is no stored data in the Subaru ECU that the dealer can see to show that the ECU was ever flashed. There is no "black box" or recorder that the dealer can look at and say "AHA! You have a flash!". We have been inside these ECUs probably more than most folks and we just cannot find any evidence for this at all. I have a feeling this is something that some service writers tell people who purchase these cars as a sort of boogy man. You should use your AccessPORT with confidence and if you uninstall the AccessPORT your ECU is back to 100% stock.

Travis
COBB Tuning
The confusion may be that some manufactures (Porsche for one), store every hour and RPM/mileage etc.. When buying a used Porsche people who know always get a copy of this.It breaks RPM s down into zones, with over revs being one of the zones. It can t be erased. This brings up a question even on Porsche if a flashed tune is stored or detected. So the technology is present but you are saying Subaru does not have it? Maybe it s a cost factor to have it. Thanks.
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Old 05-07-2019, 02:30 PM   #183
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Originally Posted by cerbomark View Post
The confusion may be that some manufactures (Porsche for one), store every hour and RPM/mileage etc.. When buying a used Porsche people who know always get a copy of this.It breaks RPM s down into zones, with over revs being one of the zones. It can t be erased. This brings up a question even on Porsche if a flashed tune is stored or detected. So the technology is present but you are saying Subaru does not have it? Maybe it s a cost factor to have it. Thanks.
Guys. Cobb posted this nearly a decade ago.

One would have to be a complete fool to think it still applies today.

Take 30 seconds and look in the warranty section. Subaru absolutely stores information related to key cycles, flash dates, and max RPM reached.

Pay. To. Play. Cant get any simpler than that.
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Old 05-07-2019, 02:59 PM   #184
cerbomark
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Quote:
Originally Posted by GlarryHoodDIT View Post
Guys. Cobb posted this nearly a decade ago.

One would have to be a complete fool to think it still applies today.

Take 30 seconds and look in the warranty section. Subaru absolutely stores information related to key cycles, flash dates, and max RPM reached.

Pay. To. Play. Cant get any simpler than that.
I didn't realize the date but what I m saying then is basically same as you as I know certain manufactures store ecu information. The million dollars question is how flashes are stored(by Subaru) and do they look the same as a power interruption or something shared with different event types or causes ?
I have no idea.
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Old 05-10-2019, 10:17 PM   #185
SubaruwalkeR
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Just kill the battery
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Old 02-26-2020, 01:02 PM   #186
Subieguy66
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Originally Posted by Daluv View Post
Travis,

if the car has been previously tuned opensource and now running accessport, can Subaru detect the change of the checksum if the "0x5AA5A55A" trick has been used for the DBW 32 bits checksum (located at 0x00FFB80 for my sh7058)?

thanx

Mart
What about the factory? Iíve heard dealers say the factory is coming to analyze for warranty claim because they(the manufacturer) is able to ďsee stuff we canítĒ in order to diagnose abuse or modifications and deny a warranty claim.

Thanks
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