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Wow, great info. So the 91-94 must be the most popular to "mod". I would assume that the 97+ have some type of flash programmable micro (h8/539?), similar to the 97+ RL's. Figuring out the protocol to use for this would be the hard part, but would be possible. Question is with those production numbers would it be worth it?I'm going to stick with the 91-94 ECU research but if there is anyone seriously interested in reverse engineering the newer OBD2 ECUs just let me know. I'd need a sacrificial ECU to get the ball rolling.I have an assortment of 91-94 NSX external ROMs on my computer here. From comparing them it appears that they used the same internal ROM code version within the microprocessor. This means the only changes and updates are in the external chip. This is great because we only need one internal MCU read to decode all of the ECU's from 91-94.-Matt
Wow, great info. So the 91-94 must be the most popular to "mod". I would assume that the 97+ have some type of flash programmable micro (h8/539?), similar to the 97+ RL's. Figuring out the protocol to use for this would be the hard part, but would be possible. Question is with those production numbers would it be worth it?
I'm going to stick with the 91-94 ECU research but if there is anyone seriously interested in reverse engineering the newer OBD2 ECUs just let me know. I'd need a sacrificial ECU to get the ball rolling.
I have an assortment of 91-94 NSX external ROMs on my computer here. From comparing them it appears that they used the same internal ROM code version within the microprocessor. This means the only changes and updates are in the external chip. This is great because we only need one internal MCU read to decode all of the ECU's from 91-94.
-Matt
