OEM Ecu !!!

[SkevosEP91]

Hello guys and greetings from Cyprus!!!!

I was wondering if the factory ECU can be programmable(like Honda's or Evo's) with any possible way and if anyone tried and did it!!!!

Because a local tuner here in Cyprus said to me to give him my standard Ecu to check if it has a part that can be replaced and the Ecu

could become programmable!!!! I think the part that spoke about is EPPROM if i am not mistaken!!!!

I am looking forward for your replies!!!!

Thanks in advance!!!!

[morgey]

The likes of mines and jam ecu's have an extra board which carries the chip that has the adjusted map. You might be able to map these if you had the software or could read the coding.

However the stardard ecu itself is not reprogramable, whether you could add your own board to it and reprogram that im unsure.

[Gainzy]

A guy called HOK on here pretty sure has a fried blitz ecu he might sell it so your tuner could have a play about with boards etc just a thought

[SkevosEP91]

Thanks for the replies!!!

We will give him tomorrow an EP91 AT Ecu just to see it and he will reply to us if in his opinion can do anything about it but i was just wondering if anyone tried it before with any results!!

[Stu]

I believe the chip needs to be removed from the board for it to be reflashed

[SkevosEP91]

Hey guys again!!!

We opened the ECU today to our tuner and from a little look he might find the chip that has the maps!! Now he said he will try to take out that chip and try to read it!!!!

Also he is going to order some chips with the same part number that are re-writable and try to tune it!!! Fingers crossed hope he can

make it!!! I will keep you informed!!!

[jordan walker]

keep us posted quite interesting

[Stu]

Hope you crack it but I think you'll find getting the chip off the board quite tricky and that the chip itself may be encoded so you would have to start from scratch tuning. It would be interesting what capability the hardware has over and above the stock maps ie resolution and rpm points.

I had a old 2et ecu years ago that someone had painstakingly removed the chip and installed a daughter board via which it was tunable. Unfortunately the hardware limited pushing the rpm out much further but it was reflashed with a different map.

Let us know how you get on

[JayJ]

As Morgey and Stu said, it's nice someone is trying to hack the ecu again, but don't get your hopes up too high as the odds aren't in our favor.

A few facts that have been found earlier:

The Toyota ECU, according to its own documents works on a formula basis. It's suspected that this is to stop people from screwing around with your car. This is also why you need to reset your ECU after each modification for maximum and speedy results. The Toyota ECU uses a formula based on one map and the ECU only has one filled in table, the others are blank. As you drive the car populates these cells. As a matter of fact, if you reset the ECU and make the car cycle for about ten minutes, it will fill the cells within the optimum setting.

Most of the aftermarket ECUs use a daughterboard, there are a few exceptions like the TOM's and the PowerFC. The original theory that the stock ECU is used until certain parameters are met then a switch over to the daughterboard is incorrect. The stock ECU is completely out of the picture at least in the case of the JAM ECU. The daughterboard runs the whole show. The data on the EPROM is encrypted and a chip on the other side of the daughterboard decrypts it before passing it to the processor. Therefore reading the EPROM is a useless endeavor. This is obviously to ensure that JDM rivals don't simply load up and copy their chips.

Tectom seems to be the only non-factory thing capable of reading the Toyota factory ECU, but they no longer make such a system due to pressure from Toyota. The Toyota ECU cannot be hacked its just simply read and dumped to another system which can be modified. Toyota JDM tuners go through nuff measures to keep their chips safe.

Edited November 19, 2014 by JayJ