I suppose. I imagine Mazda found max power at something less than WOT.

 

A-RF sells one, good luck, classic f'd up japanese site:

http://www.a-rf.com/PC/PartsList/Car...rts/index.html

 

brillo if you want to change your idle why not just drill a small hole in the throttle plate

 

I could do that (not sure if it would work) but I really want to understand how to manipulate the DBW system. I've learned how to basically through a standalone ECU on virtually any car now thanks to my experiments with the megasquirt and Interceptor, but neither of those can control DBW.

I'd like to be able to know if necessary how to defeat DBW should I find myself looking at another car wanting to modify/tweak it.

 

Why aren't you trying to mess with the throttle pedal instead of the throttle plate?

I don't think the car will be happy if you open up the throttle plate without the ECU asking for it. It's really easy to just mess with the resistance at the throttle pedal and let the ECU do whatever it wants based on that.

 

I would be willing to bet you that the fault tolerance in this system is less than 1/2 a percent. Therefore any changes you make will be seen by the PCM, if they are not seen it will not effect any noticeable change.
As for idle adjustments, what are you looking to really do? Is it an issue with smoothness at a perticular idle speed or more with loading at certain speeds.
These issues might be better addressed with fuel mapping.
My 0.02

 

Also, it sounds like Cobb and others are about to let us change a whole bunch of stuff in our ECU's very soon. Waiting to do that and tweaking the code is probably going to be the best option out there.

 

Hopefully Cobb will be able to alter and flash all parts of the PCM. Racing Beat, the only company to have sucess with flashing to date, was not able to alter the DBW settings as they were stored in a seperate part of the PCM they could not access. That doesn't mean Cobb won't have better luck, but its obivously not a easy process.

 

sorry to resurrect an old topic. But couldn't find the information I require

I'm looking for the 0-5 volt input to ECU wire on the Throttle body connector or on the ECU.

I'm performing an engine swap and am reusing the drive by wire system and the new engines ecu requires this input. I'm pretty sure it should exist but could not find it with a multimeter....



Thanks,

 

Hate to resurrect, but I have a very odd situation. 2006 GT, 6spd. Car dies 3 seconds after starting, and throws a P0222 code. Doesn't flood, and will restart eagerly multiple times in a row. Tried 4 different TBs (2 used, 2 remans) and the remans won't respond at all, while the used ones will open after start, if I go WOT, but wont hold RPM and die, if I let go. I tested every single wire on the TB and the PCM for continuity and shorts, and they all check out. The top-of-the-engine harness, in fact, is new, I got it from Mazda a year ago. Car ran fine, until one day it just wouldn't start (dies right after starting). My understanding is that even with a broken TB or pedal (also swapped that back and forth with another used one) the car will idle, just poorly and respond to throttle inputs, also poorly. It's not throwing any other codes, so I have no reason to believe it's another component. Right now, I am thinking it could the be PCM itself. Using torque, I can see the requested pedal position change as I depress the throttle pedal. but no change in the TB, even after it starts (again, unless I use the older TBs which will react to WOT only).
Any ideas?