Skoda Octavia 1997 Workshop Manual page 53

OCTAVIA 1997 2,0 l/85 kW Engine, Fuel Injection and Ignition System
add = additive - The effect of the fault (e.g. unmetered
air) becomes increasingly less as engine speed rises.
In the case of an additive initialisation value the injec-
tion period is changed by a fixed rate. This rate is in-
dependent of the basic injection period.
mul = multiplicative - The effect of the fault (e.g. faulty
injector) becomes greater as engine speed rises. The
multiplicative learned value is a percentage change in
the injection period. This change is dependent on the
basic injection period.
Display group 033, lambda control upstream of catalytic converter - lambda control values
•
Engine idling
Read measured value block 33
xx.x % x.xxx V
1 2
Lambda control before catalyst
1)
for engines with engine codes AZH, AZJ
Note
Re display field 1:
Readout must fluctuate around zero. If zero is always
displayed, the lambda control has switched from
closed-loop to open-loop control because of a fault in
the lambda control. Interrogate fault memory
Chapter 01-1.
For engines with engine codes AEG, APK, AQY
Note
Voltage signal „Mixture rich (low level of residual oxy-
gen)" is at approx. 0.7...1.0 V.
Voltage signal „Mixture lean (high level of residual ox-
ygen)" is at approx. 0.0...0.3 V.
A voltage jump from 0.7...1.0 V to 0.0...0.3 V or vice
versa takes place at the transition from „rich" to „lean"
and vice versa ( = 1.0).
In view of the steep voltage jump the lambda control
is not able to maintain constant the ideal mixture com-
position which corresponds to
constantly fluctuates back and forward between the
„slightly too lean" and „slightly too rich" states.
Edition 01.04
S00.5128.53.20
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3 4
Lambda probe voltage upstream of catalytic con-
verter
= 1.0. The control
Readout on display
Display field
Self-diagnosis VI
Specification Analysis
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—
0.00...10.00 V 01-6 page 5
1)
1.40...1.60 V
-10,0...10,0 % 01-6 page 5
01-6
01
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