Exam 31: Amplified Common Rail Systems

How many pistons are used in the DD-Series ACRS piston pump?

Technician A says that the when a HADI is operated in non-amplification mode, the resulting injection pressure should be roughly equivalent to the ACRS rail pressure. Technician B says that when the HADI is operated in amplification mode, ACRS injection pressure can more than double the rail pressure. Who is correct?

Technician A says that in a diesel ACRS fuel system, the rail supplies all of the injectors required to fuel the engine. Technician B says that the rail pressures in a diesel ACRS fuel system are designed to be widely variable. Who is correct?

What do DDC recommend when determining whether the rail to HADI high pressure pipes can be re-used?

On which engine was the ACRS fuel system introduced in North America in 2008?

Technician A says that the ACRS fuel system allows lower rail pressures to generate higher injection pressures. Technician B says that the ACRS fuel system reduces the tendency of EHIs to leak externally because the seat is not exposed to rail pressure when the injector is closed. Who is correct?

How many digits are there in an IQCC code?

What type of injector is used in a Detroit Diesel ACRS system?

What component is used to control the rail pressure of an ACRS diesel fuel system in any given moment of operation?

Technician A says that ACRS pressure during injection should be roughly equivalent to the rail pressure in all modes of operation. Technician B says that HADI injection pressure is managed by the motor control module (MCM). Who is correct?

What is used to switch a quantity control valve used in a typical ACRS fuel system?

Which of the following is another way of describing the ACRS fuel system?

Which of the following ratios represents the approximate amplification ratio used on the DDC DD-Series ACRS engines?

Which of the following serves a role as an accumulator in an ACRS fuel system?

Technician A says that the DDEC 10 is used to manage post-2010 DD-Series engines with ACRS fuel systems. Technician B says that DDEC VI was used to manage the first generation of DD-Series engines. Who is correct?

How does the DD-Series ACRS quantity control valve (QCV) manage rail pressure?

Which of the following best describes the type of pump used with the DD-Series ACRS fuel system?

What is used to lubricate the high pressure piston pump used on the DD-Series ACRS fuel system?

Technician A says that desired rail pressure in a DD-Series ACRS fuel system is calculated by the MCM. Technician B says that actual rail pressure in a DD-Series ACRS fuel system is signaled to the MCM by the rail pressure sensor. Who is correct?

Technician A says that a disadvantage of a HADI over a standard EHI, is that the HADI nozzle seat has to seal much higher rail pressures. Technician B says that the high pressure piston pump used with the current DD-Series ACRS is supplied by Bosch. Who is correct?