Quiz # 7
Air/Fuel Ratio O2 Sensors
Name ________________________
1. What are the 3 basic types of oxygen sensors found on today’s car’s?
a.
b.
c.
d.
Zirconium, Titania, Mass Air Ratio (broadband planar)
Titania, Air/Fuel, Mass O2 Ratio
Air/Fuel, Zirconium, Cerium (broadband planar)
Zirconium, Air/Fuel (broadband planar), Titania
2. How can a technician visually verify if a vehicle is equipped with an Air/Fuel sensor?
a.
b.
c.
d.
The sensor has 7 wires, with 2 grounds
The sensor has 5 wires, with 1 ground
The sensor has 6 wires with 2 grounds
Air/Fuel sensors cannot be identified by the number of wires they have.
3. At what temperature does an Air/Fuel sensor heater typically operate?
a.
b.
c.
d.
600 degrees
300 degrees
1200 degrees
400 degrees
4. Which of the following statements about the operation of a typicl Air/Fuel Ratio sensor is
correct?
a. The sensor circuit amperage changes both positive and negative as the exhaust oxygen
content changes.
b. The sensor ouput voltage varies very little when compared to a Zirconium type sensor
and the amperage changes from zero to plus (+) 100 milliamps as the exhaust oxygen
content changes.
c. The sensor output changes fron 1 to 5 volts but the amperage changes very little as the
exhaust oxygen content changes.
d. The sensor output voltage varies from (-) .450 to plus (+) 3.3 volts and the amperage
changes both negative and positive as the exhaust oxygen content changes.
5. Which of the following diagnostic procedures should be used when testing the operation of
any Air/Fuel Ratio sensor?
a.
b.
c.
d.
Hook up your DSO the test for proper voltage waveforms.
Follow the manufacturer’s procedures.
Use your scan tool in the generic OBDII mode.
Take your readings directly from the sensor itself.
6. Which of the following statements identifies the best way to determine if a vehicle is
equipped with an Air/Fuel Ratio sensor?
a.
b.
c.
d.
Check to see if it has multiple wires.
Look at the underhood emissions label.
Use your scan tool in generic OBDII mode.
Take your readings directly from the sensor itself.
7. What was the main reason(s) manufacturers changed to Air/Fuel Ratio sensors?
a. Air/Fuel sensors have a wider range and are more accurate than previous oxygen
sensors.
b. Air/Fuel sensors can be operational within 20 seconds which shortens the time a
vehicle operates in open loop.
c. Government OBDII rules required all manufactures to adopt the Air/Fuel Ratio
sensor.
d. Both A and B are correct.