Mazda RX8 K24 Swap - U1900 CAN Bus Issue - EMU Black V3 Studio
Hi ECUMaster Support,
I’m hoping you can help me with an issue I’ve been unable to resolve on my RX8 K24 swap project.
Vehicle & Setup:
2004 Mazda RX8 European spec (DSC model)
K24 engine swap
ECU: EMU Black, firmware V3 Studio 3.062
CAN stream set to Mazda RX8 Model 04
120 ohm terminator disabled (resolved U2516)
What is working correctly:
Dash gauges, speedo and tacho functioning via CAN
ABS hardware functioning correctly
Wheel speeds, steering angle, yaw rate, throttle position and RPM all visible in ABS live data
No engine torque parameter visible in ABS live data
The Issue:
Permanent TCS warning light. Autel MaxiSys 908S shows U1900 — Missing CAN message from PCM — appearing across ALL modules including instrument cluster.
Already tried:
Model 04 ABS selected
Steering wheel lock to lock calibration
Disabled EMU traction control
Enabled power steering emulation
Disabled 120 ohm terminator
User Defined CAN on 0x620, 0x630 and 0x212
Questions:
Does the RX8 Model 04 CAN stream fully emulate all PCM messages?
Is U1900 across all modules a known limitation?
Is missing engine torque related to this fault?
Is a firmware update planned?
Happy to provide logs and map files. Also happy to pay for professional support.
Kind regards,
Paul
Actually we dont have information how and on what id the torque is transmitted.
Without car with OEM ECU it is not possible to add this. Also even we will send proper torque, the EMU will not be able to respond to torque reduction from TCS system.
Oh, this is just a speculation from the information I have available
My questions are:
Has anyone had this issue before?
Has anyone else had this issue with the RX8?
Is it because mine is a DSC model
Is there any other solution to this other than to remove the traction control light?
Thank you for your help
Following up on my own post above — took about 6 months to track down the proprietary CAN
IDs needed to make this work, with zero help from ECUMaster along the way (support emails
went unanswered the whole time).
Got there in the end, U1900 cleared on all modules, confirmed stable after a proper drive.
Not sharing the specifics here after 6 months of getting nothing back from ECUMaster support
— but if anyone’s genuinely stuck on this, message me.
Sounds like they already answered you and you didn’t like the answer?
Actually we dont have information how and on what id the torque is transmitted.
Without car with OEM ECU it is not possible to add this. Also even we will send proper torque, the EMU will not be able to respond to torque reduction from TCS system.
Paving new ground takes time and effort. 
I would like to know more details if possible.
I cant seem to be able to message you, maybe you can message me.
hello sir , i have the same problem , car is a k20 turbo rx8 ,ecumaster black and v2 software, is there a way to contact you? thank you