Skoda OCTAVIA MK1 Service Manual page 142

00533
Idling control
upper limit value
lower limit value
The throttle valve positioner/potentiometer -G88- is a component part of the throttle valve
control unit - J338-. The throttle valve positioner/potentiometer (variable resistance,
4)
activated by the throttle valve positioner) notifies the position of the throttle valve to the
engine control unit.
Readout on Possible cause of fault
-V.A.G 1552-
00537
Lambda
control
upper limit
Line short-circuit to earth in the
value
t signal line from the engine control
unit to the lambda probe
t Injection valve(s) defective
Transition impedances
due to humidity in the
t plug connection for the
throttle valve control
unit -J338-
incorrect plug
t
assignment
Throttle valve
t
positioner -V60- jams
t Air filter blocked
Unmetered air to
t
throttle valve
Injection valve
t
defective
Fuel pressure regulator
t
defective
t irregular idling
Poor vehicle
t
handling
Increased fuel
t
consumption
t Smell of fuel
Possible
effects
no lambda
t
control
t Poor
142
Inspecting throttle
–
valve control unit
→ Chapter.
Testing the intake
system for
–
tightness
(unmetered air)
→ Chapter.
Testing injection
–
valves →
Replace the fuel
–
pressure regulator.
Rectifying fault
Checking lambda control
–
→ Chapter.
– Testing injection valves
Chapter.