Check The Function Of The Lambda Control - Skoda OCTAVIA MK1 Service Manual

The lambda controller is activated if the lambda probe
t
is operational.
Perform a test drive and while doing so observe the
–
display field 4.
WARNING
The -V.A.G 1552- should be operated by a second
person.
When inserting the lambda control, the lambda probe must be
operational and the lambda controller must be switched on.
The display for the condition of the mixture (the position on the far
right of the 8-digit numerical block) must constantly oscillate
between "0" and "1".
A "1" on the position for the condition of the mixture indicates a
rather rich mixture composition (low level of residual oxygen in the
exhaust gas).
A "0" on the position for the condition of the mixture indicates a
rather lean mixture composition (high level of residual oxygen in
the exhaust gas).
If irregularities occur before inserting the lambda control, the
–
lambda control cannot be the cause of the fault.
If irregularities occur only after inserting the lambda control,
–
check operation
Note
If the irregularities decrease after inserting the control, the cause
of the fault (e.g. unmetered air, defective injection valve, etc..) is
t
counteracted by engaging the control. This can be detected by
reading out the lambda learned values.
Select 08 for the function "read measured value block" and
t
display group number 011.
Compare the actual values (displayed by the tester) with the
–
specified values.

Check the function of the lambda control

Select 08 for the function "read measured value block" and display group number 001
–
→ Chapter.
The following appears in the display:
Only proceed with test once the coolant temperature in
→ Chapter.
Reading measured value block 1
->
850/rpm
222
Reading measured value
block 99
->
850/rpm 90°C
00010111
90°C 0.80 V
+25%