Exam 24: Engine Performance Systems

Scan tools can be used to cycle on and off some actuators such as injectors, vacuum solenoids, idle air control motors, and the like.

What is the function of the EVAP system monitor?

The OBD-II system will illuminate the MIL if a failure is detected that will cause the emissions levels to exceed ____________________ times the allowable standards for that model year.

The two types of ignition systems are EI (electronic ignition)and ______.

What is short-term fuel trim?

Oxygen sensor monitors are being discussed. Technician A says the system monitors the sensor response time as the system cycles lean-rich-lean. Technician B says that at certain times the monitor varies the fuel delivery and checks for heated oxygen sensor response. Who is correct?

The PCM can be electronically linked to other control modules.

The PCM can turn off the A/C compressor when the engine is operating at full throttle.

Before performing any repairs on a vehicle with an illuminated MIL light: Technician A records all DTCs and freeze frame data. Technician B checks for service bulletins.Who is correct?

You can use a generic scan tool to access a manufacturer PID.

In an OBD-II system, each component is checked by a diagnostic routine to verify that it is functioning properly.

The ____________________ sensor is used by the misfire monitor to detect excessive misfires.

What are flash codes?

In a GDI system (gasoline direct injection)the injector sprays fuel into the ______.

On an OBD-II vehicle, the DLC connector is located under the ____________________  .

A ______________________ or _____________________ increases engine efficiency by forcing (pumping)more air into the cylinders.

Which of the following jobs is NOT a function of the ignition system?

During the secondary AIR active test, the PCM cycles the AIR flow to the exhaust manifold on and off during closed loop operation and monitors the ____________________ voltage and the short-term fuel trim value.

What is the principal function of the OBD-II system?

What is a type B misfire?