Cant Write To My NVRAM
Re: Cant Write To My NVRAM
Just noticed your log says no response to the writes - is that normal for a write protected nvram or would you still get a response of some sort?
- VL400
- Posts: 4991
- Joined: Sun Mar 01, 2009 2:54 pm
- cars: VL Calais and Toyota Landcruiser. Plus some toys :)
- Location: Perth, WA
- Contact:
Re: Cant Write To My NVRAM
It would be really nice if the DS RAM chip had some smarts like Flash memory where you can request info from the chip (locks, type etc). Would be nice to be able to interrogate the battery status.festy wrote:I stand corrected, there is no mention in the datasheet of write protecting on low internal battery, the DS1210 has a feature where it blocks the second memory cycle to warn of a low voltage but it's not an actual write protect mode. That must have been what I was thinking of...
And that also explains why I've never seen a WP'd NVRAM, but have seen a couple that program and verify fine, but lose their memory as soon as they're removed from the programmer.
They will be read-only if the ECU's 5v supply drops below 4.5v (-Y) or 4.75v (-AB) but I think you'd have bigger problems in that case...
Yeah it is..festy wrote:Just noticed your log says no response to the writes - is that normal for a write protected nvram or would you still get a response of some sort?
VL400 wrote:The way the flashtool fails to write indicates that the ECU is in read only mode to the NVRAM (it does a test on boot), it black holes all attempts to write to it so TP/flashtool software fails. Even writing a 100% identical cal to the ECU will fail, the 12P bin checks the NVRAM status before any attempt to write data.
Re: Cant Write To My NVRAM
I have found the problem and now can write. I has bent a pin over on the socket on the ecu board. And turn out its where the write wire connects to underneath.
I was mucking around swapping my NVRAM and a mates one last weekend. look like when i went home and re fitted mine i bent the pin.
Appreciate everyones help and VL400's offer for me to send it to him. Its the support like this you dont get anywhere else.
Thanks!
I was mucking around swapping my NVRAM and a mates one last weekend. look like when i went home and re fitted mine i bent the pin.
Appreciate everyones help and VL400's offer for me to send it to him. Its the support like this you dont get anywhere else.
Thanks!
Re: Cant Write To My NVRAM
yep.... done that before myself
Re: Cant Write To My NVRAM
That's good to hear, still feel stupid though
- Holden202T
- Posts: 10311
- Joined: Sat Feb 28, 2009 9:05 pm
- Location: Tenambit, NSW
- Contact:
Re: Cant Write To My NVRAM
I'd say we all have!
I have a socket on my nvram chip cable tied to it to remove from the memcal board as I almost snapped an nvram pin removing it once!! that was a scary moment!
I have a socket on my nvram chip cable tied to it to remove from the memcal board as I almost snapped an nvram pin removing it once!! that was a scary moment!
No matter what the question is, the answer is always more horsepower!
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
- VL400
- Posts: 4991
- Joined: Sun Mar 01, 2009 2:54 pm
- cars: VL Calais and Toyota Landcruiser. Plus some toys :)
- Location: Perth, WA
- Contact:
Re: Cant Write To My NVRAM
Your not the first and wont be the last for that! Glad its all sorted