CarterPillar Computer

You won't find schematics for any kind of OEM ECU. You're on your own, open it up and draw out a schematic of the relevant part.

Did you try asking Mr. Pillar? I here Carter is really a nice guy... (I doubt that they will part with schematics or such, however)

What is this engine used for?

The chances of getting ahold of that schemo are, let me check.... ZERO. It's a replacable part, they don't WANT you to fix it, they want you to buy a new one. I'm sure if you call Finning/Caterpillar they'll happily tell you that their product designs are proprietary and that giving them out would open them up to liability.

BTW, what model of diesel is it controlling, i.e. a 3306, etc?

Not sure, I will check with my customer.

Bye Jacques

I know, I did try to draw it, but the PCB is multi layer and some traces are hard to follow. I only need the supply section and the injector drive section.

Bye Jacques

What are the symptoms? Just test the likely culprits in the affected areas. Is power present on the power rails? Is the voltage appropriate? Are the ouput transistors shorted? You can get datasheets easily for many individual components and those will give you an idea of what you should expect to see.