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C3Ferrari
09-26-2020, 04:10 PM
Does anyone know what pins are used for the Serial Port interface on the Flash II ECM are (Data+, Data-, Return). I know they are D10, D11, and D12, but which one is which? I have a new unit I just installed into an '89 Corvette (it's TPI, so I have the Port Mod, if that matters), and it won't communicate with my laptop. Any help or ideas would be greatly appreciated.

dave w
09-26-2020, 04:15 PM
Link to Dynamic EFI: https://www.dynamicefi.com/EBL_Flash_Install.php

dave w

C3Ferrari
09-26-2020, 04:19 PM
Been all through everything on the site, but none of his wiring diagrams have the serial port pins on them!

RBob
09-26-2020, 05:11 PM
Recall that the serial data at the ECM is 5V (TTL), don't go anywhere near 12V or it will pop the port on the micro-controllers.

D10 is RX to the EBL ECM
D11 is TX from the EBL ECM
D12 is ground

For the most part TX is always active (ECM powered up). RX is active when flashing and when a bank selection is made.

RBob.

C3Ferrari
09-26-2020, 05:43 PM
Thanks!:thumbsup: