Exam 85: Positive Crankcase Ventilation and Secondary Air-Injection Systems

Two technicians are discussing exhaust check valves used in SAI systems. Technician A says that they are used to prevent the output from the SAI pump from entering the intake manifold. Technician B says the check valves are used to keep the exhaust from entering the AIR pump. Which technician is correct?

An electric SAI pump is controlled by ________.

The electric AIR pump is energized for ________.

The SAI system is used to reduce which exhaust emission?

All engines are equipped with a PCV valve.

In what year did PCV system monitoring become mandatory?

Where is the output of the AIR pump directed when the engine is cold?

When checking for the proper operation of the AIR system using an exhaust gas analyzer, how much should the oxygen levels increase when the pump is allowed to function?

Technician A says that if the PCV valve were defective or clogged, the engine could idle rough. Technician B says that the engine may stall. Which technician is correct?

A P0410 DTC indicates a problem with ________.

The PCV system controls which exhaust emission(s)?

Technician A says that the PCV system should create a slight pressure in the crankcase at idle. Technician B says that the PCV system should create a slight vacuum in the crankcase at 2,500 RPM. Which technician is correct?