Hi there,
i have a Suzuki TL1000R bike which uses a 16bit Denso ECU. Till now at the tlzone forum we have recognised the MCU which is a 68HC916R1 variant and i have programmed an app for the PD BDM cable to read and write the ecu from the BDM port. On my bike i have the moded ecu with modded maps, we haven't found all of them yet but we are progressing, and it runs really good!
I am writing to this forum because i trying to find a way to reflash the ecu from the main connectors. I have read that the early Subaru uses some kind of bootloader to do that. Here is what i have till now:
There are 2 serial communication ports from the cpu to the main connectors. These are SCIA and SCIB. Both use a mux circuit for one wire communication.
SCIB is used for communication between the ECU and the Dashboard. This transmits useful data to the Dash and if i ground a pin from the ECU i can see trouble codes in the Dashboard. I can even set the TPS sensor in this mode. This is a standard to all the Suzuki bikes.
SCIA has a mux circuit that i mentioned before and the pin at the main connector doesn't connect anywhere. The circuit has all the components. So it is functioning. I used a FT232 TTL dongle set at different baudrates but i can't get any data. It is like it is waiting for a wake up signal or a command. I have to tell you that Suzuki implemented the OBDII protocol to bikes produced after mine, so it isn't OBDII.
Is there a possibility that my ECU has a bootloader? If yes how can i search for it's wake up command? If not can i program a bootloader in the firmware? I have the firmware and the map data saved at different files. I have used IDA pro 5.1 to disassemble the firmware but i am not an expert, so maybe i have done mistakes. I can't even find code for the pin that i ground to get the trouble codes to the dash, so maybe my disassembled file is wrong.
I am asking for your help because you have experience in the Subaru 68HC16 ECU. There are friends that help me in this too and one of them posts here as Rhinoman. He has done some marvelous work on the Suzuki car ECUs!
Please if you can help us in that project. I have learned many from this project and i want to learn more. Everyday i live, I learn more!