Mazda EFI ECMs

[Zack]

Andrew,

Mmm, all those vacuum actuators really serve to manage the twin-turbo
system.  You may want to try posting this message to 

rx7 at world.std.com

also.  

Zack

----------
> From: Andrew Ghali <andrewg at netcom.com>
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Mazda EFI ECMs
> Date: Monday, February 23, 1998 4:10 PM
> 
> 
> Gentlemen-
> 
> I see that there is a huge collective knowledge of GM ECMs on the list.
> Unfortunately, do not I have a GM.  I have a '93 Rx7 that I am trying
> to understand.  For 2 lousy rotors, there are no less than 12 vacuum
> actuators (and matching solenoid valves) that control the performance
> of the motor.  How and why, I don't know - that's what I'd like to find
> out.
> 
> As I understand it, the pre-96 Rx7 ECM (or ECU as they call it) have an
> 8 bit uC (I think a 6811), while the later ones are 16 bit.  Also, the
> ECU has a diagnostic connector that could be connected to a device,
called
> the DT-S1000, which could bi-dirctionally communicate with the ECU to
> query engine state and analog sensors, and it could drive individual
> actuators on demand.
> 
> What I'd like to find out is: how many different ECU types does Mazda
> make, what is in the '93 ECU, and how is the bidirectional communication
> work?
> 
> Thanks for any help.
> 
> Andrew