Kia 2004.5 Spectra Service Technical Training page 138

2004.5 Spectra Technology
Review of a typical Zirconia HO2S:
• Used on most Kia vehicles
• Works essentially like a switch
• Only determines IF the AFR is rich or lean
• Rich condition is a high output voltage (<1V)
• Lean condition is a low output voltage (>0V)
• The voltage signal can be measured and graphed
on Hi-Scan Pro.
WIDE RANGE HO2S
The Sensor 1, front HO2S, used on the 2004.5 Spectra
2.0L engine is a linear oxygen sensor mounted on the
front side (upstream) of the catalytic converter in the
exhaust manifold. This the first Wide Range or
Broadband sensor used by Kia. It's sometime referred
to as a 5-wire HO2S due to the number of wires at the
sensor feeding into a 6 pin connector.
The PCM uses the signal from the wide range HO2S
for air-fuel management (control). As the air-fuel
(A/F) mixture richens or leans, the change in oxygen
content in the exhaust causes the wide range oxygen
sensor to modify a PCM-supplied current. This change
in current is almost linear and can be used by the PCM
to identify the oxygen content and therefore the A/F
ratio. Inside the sensor, this current is used to pump
exhaust gas across a sensing cell and allows larger
range of A/F mixtures.
Driveability
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