ESP AUDI A4 1999 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual

24-76

-
Press button to change into display group
033.
- Check oxygen sensor control in display fields -1-
and -2-.

Display fields

1 2 3 4
Display group 033: Oxygen sensor control
Display
xx.x %
x.xxx V


Indicated
Oxygen sensor control bank 1, sensor 1
Oxygen sensor voltage, Bank 1, sensor 1

Specified
value Value must fluctuate at least 2 % in the
range -10.0 to 10.0 % 0.130 to 3.600 volts


Note
If specified value is not obtained
Continuation, Page 24
-77

If specified value is not obtained Evaluation
display group 033, Page 24
-80



Note for display field 2:
The oxygen sensor voltage signal which is processed and calendered by the Engine Control Module (ECM) will be displayed.
1.5 volts in display corresponds to Lambda 1.
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24-94

Heated Oxygen Sensor (HO2S) and
oxygen sensor control after Three Way
Catalytic Converter (TWC), checking


Note:
The oxygen sensor before catalytic converter
(bank 1, sensor 1) regulates to Lambda 1. If this
oxygen sensor is damaged, e.g. due to soiling or
overheating, the regulation value may have
shifted. Deviations from Lambda 1 are detected
by the oxygen sensor after catalytic converter
(bank 1, sensor 2). If it recognizes the deviations
downward or upward, it influences the regulation
before catalytic converter, generally increasing or
decreasing it respectively.
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