HEATED OXYGEN SENSOR (except centor exhaust pipe
heated oxygen sensor <california>)
ZK604040 AA00
Sensing area
Heated oxygen sensors are installed in 2 positions (front, rear)
on both the right bank manifold catalytic converter and left bank
manifold catalytic converter. Heated oxygen sensor has a built-
in heater to help early activation of the sensor. This allows
feedback control of air-fuel ratio soon after engine start.
ZK600249
0.8
14
15
16
AA00
Theoretical air fuel ratio
Electro motive
force (V)
Rich
Lean
Air fuel ratio
This sensor uses the oxygen concentration cell principle of solid
electrolyte (zirconia) and displays the property of sudden change
in output voltage near theoretical air-fuel ratio. This property is
used to detect oxygen density in exhaust gas. Feedback to ECM
allows it to judge whether air-fuel ratio is rich or lean compared
to theoretical air-fuel ratio.
ZK600250
100
0
HC
CO
NOx
50
AA00
Purge ratio
Theoretical air fuel ratio
This allows ECM precise feedback control to get theoretical air-
fuel ratio with best cleaning efficiency of 3-way catalytic
converter.
13A-16
MULTIPORT FUEL SYSTEM (MFI)
SENSOR