Skoda Octavia 1997 Workshop Manual page 54

01
The readout must in some cases be less than 0.3 V
and in some cases more than 0.6 V. The readout be-
low 0.45 V indicates a lean mixture while above 0.45
V indicates a rich mixture.
At idling speed, the lambda probe voltage upstream of
the catalytic converter must fluctuate between a rich
and leaner mixture. The lambda probe voltage down-
stream of the catalytic converter should indicate a
constant rich or lean mixture. If the voltage also fluctu-
ates downstream of the catalytic converter, either the
catalytic converter is faulty (
block 046 01-6 page 10) or the probes have been
wrongly connected (irregular engine running). Lamb-
da control varies between -15...15 %.
Voltage of the 4-pin lambda probe in U in mV
A: Lambda probe voltage high
rich mixture (fuel surplus or air shortage)
high CO value
B: Lambda probe voltage low
lean mixture (fuel shortage or air surplus)
low CO value
For engines with engine codes AZH, AZJ
Note
Re display field 2:
Voltage signal „Mixture rich" (low level of residual ox-
ygen) is at approx. 0.13...1.50 V
Voltage signal „Mixture rich" (high level of residual ox-
ygen) is at approx. 1.50...4.80 V
01-6 4
page
OCTAVIA 1997
Read measured value
Self-diagnosis VI
2,0 l/85 kW Engine, Fuel Injection and Ignition System
A
mV
800
600
400
200
0
0,80 0,90
B
1,00 1,10 1,20
A24-0074
Edition 01.04
S00.5128.53.20