For the ecm curious

[Bruce]

When you're really curious, and want to actually evaluate different ecms, and the codes they run, you might turn to doing something like I have.

Here's a few pics of some of the adapters, and ecms I've tried in my GN.

One shows how I wired a 256 series adapter in, so the that I could use EEPROMs, another one shows the 256 series of socket that's hard wired into the PCB, to that I can run my own code (the onboard ROM has been severed), then an 8253, and 749 ecm with adpaters to run in a GN. Then the 3247 is the later S/C pcm, that I'll soon be playing with. Then I have two power supplies, one is just a 750ma version, and the other, a 30A (if I need to, I can also plug in a car battery, for full-on injector testing). Plus a series of injectors wired up, so that I duplicate any type of injector(s), for load testing the ecms.

The harness ends are available from recycling centers, and Casper's Electronics sells the green Printed Circuit Board Adapter seen in the one adapter picture.



What's neat about all this, is that before I run any of this in the car, I can pre-run it, and make sure the car should at least run, and that I'll be able to establish a link with the ecm for diagnostic purposes. That, and I have a *list* of what timing/PWs, I'm currently running, and edit the new ecms calibration area to get close to what I have now, which shortens the time it takes to tune in a new ecm.

[Bruce]

Here are a few other accessories, while at a glance they might look like alot of money, they're all used, the MATCO scope was $200, the Technic Scope $75, the power supply was for shipping only ($45, it's heavy), and the small PS was from a garage sale for $1.

The first picture is of the 1227148 specific ecm bench. That's a Locker Board plugged into the edge card connector, and is what allows me to monitor all 255 ROM locations, as well as data log at 17 frames a second, for a much memory as the computer has available (1 hour data loging is almost a daily ocurrance, :) ).