FLA -42
FUEL SYSTEM
HEATED OXYGEN SENSOR
(HO2S)
INSPECTION
E1DADE40
FUNCTION AND OPERATION PRICIPLE
Heated Oxygen Sensor (HO2S) consists of zirconium and
alumina and is installed on upstream and downstream of
the Manifold Catalyst Converter (MCC). After it compares
oxygen consistency of the atmosphere with the exhaust
gas, it transfers the oxygen consistency of the exhaust gas
to the PCM. When A/F ratio is rich or lean, it generates ap-
proximately 1V or 0V respectively. In order that this sen-
sor normally operates, the temperature of the sensor tip
is higher than 370℃ (698℉). So it has a heater which is
controlled by the PCM duty signal. When the exhaust gas
temperature is lower than the specified value, the heater
warms the sensor tip.
Terminal
Sensing Element
EGRF247A
Cable
Terminal Interface
Element Tip
Shield
EGRF248A
SPECIFICATION
A/F Ratio
Output Voltage (V)
RICH
0.80 ~ 0.92
LEAN
0.1
Item
Specification
Heater Resistance (Ω )
3.0 ~ 4.0Ω at 21℃
(69.8℉)