Ch 25
A wide band oxygen sensor is capable of detecting the air-fuel mixture in the exhaust from ________ (rich) to ________ (lean). 12:1, 15:1 13:1, 16.7:1 10:1, 23:1 8:1, 18:1
10:1 , 23:1
A wide band oxygen sensor needs to be heated to what operating temperature? 600 deg. F 800 deg. F 1400 deg. F 2000 deg. F
1400 deg. F
A wide band oxygen sensor was first used on a Honda in what model year? 1992 1996 2000 2006
1992
A conventional oxygen sensor has a reading of 900 mV on a multimeter. This indicates ________. A rich exhaust A lean exhaust A vacuum leak None of these
A rich exhaust
A single cell wide band oxygen sensor may also be called a(an) ________. Air-fuel ratio sensor Exhaust sensor Nerst cell sensor Pump sensor
Air fuel ratio sensor
A dual cell wide band oxygen sensor can be tested using a(an) ________. Scan tool Voltmeter Oscilloscope All of the above
All of the above
A wide band oxygen sensor can be made using what design? Cup and thimble Cup and planar Finger and thimble Dual cell and single cell
Dual cell and single cell
One advantage of a planar-type oxygen sensor is ________. Faster light off time It uses only one electrode Takes more than two minutes to light off It can be color coded for different vehicles
Faster light off time
A wide band oxygen sensor heater can draw how much current? 0.8 to 2.0 A 2 to 4 A 6 to 8 A 8 to 10 A
Not 0.8 to 2.0 A
A conventional oxygen sensor heater keeps the sensor at about ________ degrees F. 600 1400 212 194
Not 1400
When the air-fuel ration is expressed in lambda a lambda number of 1 means ________. A rich mixture A lean mixture A 1 volt reference A 14.7 to 1 air-fuel ratio
Not a rich mixture
When the exhaust is rich, the PCM applies a ________ current into the pump cell. Positive Negative Neutral None of these
Not none of these
Technician A says that a wide-band oxygen sensor, also called a lean air-fuel (LAF) sensor, can detect air-fuel ratios from as rich as 10:1 to as lean as 23:1. Technician B says that a conventional oxygen sensor cannot detect the exact air-fuel mixture. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Not tech b only
n some hybrid electric vehicles, the wide band oxygen sensor can cause the PCM to enter closed loop ________. As soon as the engine (ICE) starts Within 10 seconds of engine (ICE) start-up By the time the vehicle reaches 60 mph Within 2 minutes
Not within 10 secs
When the exhaust is lean, the PCM applies a ________ current into the pump cell. Positive Negative Neutral None of these
Positive
If voltage from the heater circuit bleeds into the Nernst cell the MIL might not come on. True or False
True
