Technician A says that servo-hydraulic injector actuators use a small amount of control valve movement to control larger, more powerful, and faster-acting hydraulic forces.

Technician B says that control valves that use piezoelectric technology are the only actuators capable of servo action.

Who is correct?

     Technician A says that rate shaping involves changing the quantity of fuel as it is discharged from the injector spray holes.

Technician B says that rate shaping requires multiple injection events and a high-pressure fuel system with the ability to vary injection pressure.

Who is correct?

Technician A says that dirt bypassing the filter on some CR systems can cause an injector to stick open and con­tinuously fuel a cylinder.

Technician B says that any dirt particles may potentially damage the injector, but they will not allow an injector to full-fuel or cause the engine to run away.

Who is correct?

    Technician A says that faster-responding piezoelectric injectors are best suited for use in light-duty CR engines.

Technician B says that the engine speeds of automotive die­sels do not require the piezoelectric injector’s higher num­ber of injection events.

Who is correct?

  Technician A says that servo-hydraulic actuators that use electromagnets are more durable than piezoceramic actu­ators.

Technician B says that piezoceramic actuators are as durable as, if not more durable than, servo-hydraulic injec­tors that use electromagnets.

Who is correct?

Technician A says that cylinder misfires can be detected on CR engines by slightly cracking open the fuel line to each injector when the engine is running.

Technician B says that it is important to place a shop towel over the injector when checking for misfires to prevent pressurized fuel from pen­etrating the skin.

Who is correct?

    Technician A says that CRI2 injectors will amplify injection pressure under heavy loads as needed by the engine.

Tech­nician B says that injection pressure amplification takes place only in CR3 injectors.

Who is correct?

While two technicians are discussing the purpose of a sec­ond electrical control valve, which regulates fuel volume supplied to the inlet of the high-pressure pump, Technician A says that the control valve is a VCV that helps reduce fuel consumption.

Technician B says that the second control valve is a VCV and is needed to reduce emissions. Who is correct?

     While performing a back-leakage test for a second-generation Bosch CR fuel system, the fuel volume from the cylinder head is measured to be above specification.

Tech­nician A says that the cause could be a leaking quill tube.

Technician B says that the cause could be one or more in­jectors with worn-out ball valve seats. Who is correct?