FAST ECU pinout question

[10SV6]

On the FAST ECU pinout chart, pin M2 is listed as "ANA RTN, and pin M3 is listed as "DIG RTN".

What are the purposes of these two pins ?

I'm guessing that they are analog and digital signal return pins but for what signal ?

Thanks for any help.

Paul

 

[Craig Smith]

The analog and digital circuitry in the ECU each hae their own ground planes on the circuit board. Keeping each one phsically isolated from each other all the way back to the battery is the best way to keep electrical noise and ground loops at a minimum.

These are the kinds of things where the ECU would probably work OK without these precautions, but taking them is still the smart thing to do. Problems of that sort are rare, but when problems of that sort do creep up they are a BEAR to track down and fix.

 

[10SV6]

Ok, so they should be connected directly to the battery ground ?

 

[Craig Smith]

Yup. Running a wire for each one all the way back to the battery is the best way to do it.

 

[10SV6]

Great. Thanks for the help Craig.