1999 d12 ecu problem

yes, many times, I work for company with Volvo, Mercedes and Renault (Mack) fleet.

I started with old 101 and 123 engines, later with D12A engine.

Your engine is D12C. Your engine is Euro-II/EPA98. LAter D12C was calibrated to EPA 2001/Euro-III..

Eaely D12D were Euro-III w/o EGR.

D13A was made for future Euro-6 and EPA2012

 

low fuel pressure, lower 1.2 BAR and you get fault codes and cyl. missfire codes.

Power loss is usually related with low boost, sensor is reliable thing, But EPG!!!! yep, stuck EPG! try to drive with disabled engine brake and may be you get no power loss!

 

EPG is located on turbo, held with clamp

 

the easy way is to use compressed air. to be sure it fully open - remove it

 

Yep, you can. if you disable air from EPG valve and solenoid is connected to ECU - no fault codes