142 Auto Engine Performance and Driveability
12. When a vehicle is first started, it is in _____ and
operates using preset parameters in the ECM. During
_____, the ECM monitors all sensors for changes
and adjust systems to maintain operation within set
parameters.
(A) closed circuit; open circuit
(B) closed loop; open loop
(C) open loop; closed loop
(D) open circuit; closed circuit
13. OBD II is an acronym for _____.
14. OBD II can:
(A) correct sensor malfunctions and driveability
problems when they occur.
(B) detect potential problems before they affect
emissions.
(C) Both A & B.
(D) None of the above.
15. OBD II systems can determine the type of problem in
a circuit. List the four types of problems.
ASE Certification-Type Questions
1. Technician A says that volatile ECM memory is
called EEPROM. Technician B says that volatile ECM
memory is called FEPROM. Who is correct?
(A) A only.
(B) B only.
(C) Both A & B.
(D) Neither A nor B.
2. All of the following terms are associated with KAM,
except:
(A) keep alive.
(B) programmable read only.
(C) nonvolatile RAM.
(D) adaptive strategy.
3. Technician A says using a scan tool is the easiest
means of retrieving trouble codes. Technician B says
the OBD II system can only be accessed by using a
scan tool. Who is correct?
(A) A only.
(B) B only.
(C) Both A & B.
(D) Neither A nor B.
4. In many sensors, a reference voltage is passed
through a ______ to produce a final voltage reading.
(A) diode
(B) resistance unit
(C) capacitance unit
(D) PROM
5. All of the following are types of airflow sensors,
except:
(A) capacitor discharge.
(B) heated wire.
(C) air valve.
(D) Karman vortex.
6. The ECM reads engine ______ to decide whether to
place the system in closed or open loop.
(A) speed
(B) oil pressure
(C) temperature
(D) airflow
7. All of the following statements about computer
control systems are true, except:
(A) A Class A bus can carry data only at Class A
speeds.
(B) One computer directly performs all vehicle
electronic tasks.
(C) A Class C bus is faster than a Class B bus, which
is faster than a Class A bus.
(D) A CAN assigns a priority to each bit of
information passing over it.
8. Technician A says that a flashing MIL may be caused
by a low fuel level. Technician B says that a flashing
MIL may be caused by a defect in the starting system.
Who is correct?
(A) A only.
(B) B only.
(C) Both A & B.
(D) Neither A nor B.
9. An example of an electronic output device is the
______.
(A) ECM
(B) ignition module
(C) coolant temperature sensor
(D) transmission pressure switch
10. Technician A says that many ECM-related electronic
components are input sensors. Technician B says that
many ECM-related electronic components are output
devices. Who is correct?
(A) A only.
(B) B only.
(C) Both A & B.
(D) Neither A nor B.