Technician A says in order to meet OBD standards, diesel control systems use many of the same inputs as a gasoline engine (such as the MAP, IAT, MAF, TP, CKP, and CMP sensors). Technician B says the pressure in the fuel rail of a modern common rail diesel engine can range from 2,000 psi (138 bar) to 25,000 psi (1,724 bar). Who is correct?

Question

Quizplus · Accepted Answer

Both technicians are correct. Diesel engines use similar sensors as gasoline engines for OBD compliance, and modern common rail diesel engines do operate with fuel rail pressures in the range mentioned by Technician B.

Technician a Says in Order to Meet OBD Standards, Diesel