335 with an ISC CM2150

[Chamberpains]

Do you have Cummins Insite to monitor sensors and data? You have an "electronic" engine. Its good to wrench on things like its an old mechanical because you can physically verify things are clean and in good operating condition. But your in a position now where you need to know what the engine is seeing and acting/reacting on.

I know nothing about the ISC's but Cummins Insite connects to all Cummins models and has troubleshooting trees for all of them too. Im not positive but Im 99% sure you can use the same version (7.6.2) we all use on our ISX's. Its all over the Internet and the Inline adapters are for sale inexpensively too.