Kia 2004.5 Spectra Service Technical Training page 142

HO2S ENGINE COLD
AT IDLE SIGNAL
24
To review Linear HO2S:
• Indicate HOW rich or lean the AFM is
• This how rich or lean ability is important to more
closely control the AFR in order to reduce exhaust
emissions or when the engine is operated in a lean
condition
• The linear HO2S output signal is a variable current
• The output signal cannot be measured or graphed
• The PCM signal can be used for diagnostic
• Lean mixture is indicated by a High voltage
• Rich mixture is indicated by a Low voltage
N N o o t t e e : : P P i i n n n n u u m m b b e e r r s s t t h h a a t t m m i i g g h h t t b b e e m m o o l l d d e e d d o o n n t t o o
t t h h e e c c o o n n n n e e c c t t o o r r m m a a y y n n o o t t b b e e a a p p p p l l i i c c a a b b l l e e t t o o t t h h e e E E T T M M
This is a typical linear O2 signal recording with engine
cold and at idle, using Hi-Scan Pro flight recording.
2004.5 Spectra Technology
Driveability