I am just curious if anyone knows what is in the ECM? Is it a custom microcontroller, an off the shelf microcontroller or a version of a general purpose CPU?

 

Has anyone ever taken one apart to see what is in it? How much RAM etc?

I am just curious if anyone knows what is in the ECM? Is it a custom microcontroller, an off the shelf microcontroller or a version of a general purpose CPU?

 

Has anyone ever taken one apart to see what is in it? How much RAM etc?

 

I've had one open. It has a standard EPROM that looks like it is set up so it can be programmed in-circuit. If I remember correctly there is also a pretty standard static RAM. All storage would be miniscule compared to today's desktops. I didn't recognize the numbers on the two bigger chips, but didn't bother to look them up. They were made by Hitachi (surprise, surprise). Lots of other miscellaneous stuff, I think some TTL, probably some analog stuff too.

Lots of other miscellaneous stuff, I think some TTL, probably some analog stuff too.

 

You are correct Msteel. I have repaired some ECUs that had some problems in the analog area.