put it this way, i worked on a CT50 copy china made engine, tinkered with the electrics, and yes, gasoline engines require a spark, diesel no... but there was ZERO digital logic circuits on that bike, and this was circa 2008, everything was old school 6V analog, hard switches, solenoids, etc.

seriously, those who understand, will get it when i say that diesel engines will come back in a big way for utility transport when there is too much frequency of CMEs and the gagnetic shield of the earth goes through its' flip

it's going to be so bad that even electrical devices underground will still need some tin foil to stop the gamma from toasting the ICs 

 For light duty, yes, computers started to hit the road in 1994 models with fully controlled the engines. For Ford this was called EEC-V Diesel Powertrain Control (DPC) V1. These controlled the Navistar (international) 7.3L engine. This era was my specialty. Ford started testing and writing firmware dating back to 1980 but it didn't hit the road till 94. 

Chrysler followed in 95 for common rail Cummins engines, GM followed in 2002. 

Volkswagon ran mechanically injected to 2004 iirc for passenger cars here in the US.  

 See, I was in Australia and my grandfather swore by diesel golfs. And yeah the main way to know it's computer controlled is the lower case i