Skoda OCTAVIA MK1 Service Manual page 159

high lambda
initialisation
values
7
The "operating condition of the lambda control" is shown itemised with a bit pattern
t
in the measured value block 099, in the display field 4 (8-digit display).
8 less than 4
greater than
12
filter -N80- constantly open
t Air mass meter faulty -G70-
Lambda probe heating defective or
t
lambda probe dirty
high lambda idling learned values at
slightly higher lambda partial load
t
learned values: a little unmetered air in
the intake manifold
t Injection valve blocked
t Fuel pressure too low
Unmetered air between -G70- and
t
throttle valve
Unmetered air at the exhaust manifold
t
gasket
Lambda probe heating defective or
t
lambda probe dirty
Throttle valve potentiometer in the
t throttle valve control unit -J338-
defective or incorrectly set
Unmetered air between the intake
manifold and the air mass meter (results
in a higher idling speed; the throttle
t
valve control unit attempts to adjust the
increased idling speed to the nominal
idling speed)
Adaptation of the throttle valve control
t
unit not carried out -J338-
Throttle valve potentiometer in the
t throttle valve control unit -J338-
defective or incorrectly set
t Incorrect throttle cable setting
t Throttle valve jams
159
→ Chapter.
– Check -N80- → Chapter.
– Check -G70- → Chapter.
Check lambda probe
–
heater → Chapter.
– Eliminate cause.
See display group 011,
–
display fields 2 and 3.
Testing injection rate
–
→ Chapter.
– Check -G70- → Chapter.
Check fuel pressure
–
→ Chapter.
Eliminate cause of
–
unmetered air.
Check lambda probe
–
heater → Chapter.
Inspecting throttle valve
–
control unit -J338-
→ Chapter.
Eliminate cause of
–
unmetered air.
Carry out adaptation of
–
the throttle valve control
unit - J338- → Chapter.
Inspecting throttle valve
–
control unit - J338-
→ Chapter.
Adjust throttle control
– cable. → 1.6 ltr./74 kW
Engine, Mechanics → Rep.
Gr.20.
– Eliminate cause.