Inspecting Throttle Valve Control Unit; Check Throttle Valve Control Unit For Vehicles 08.97 - Skoda OCTAVIA MK1 Service Manual

Inspecting throttle valve control unit

Operation
The idle stabilizer is integrated into the throttle valve control unit.
Throttle valve potentiometer, idling switch, throttle valve positioner and throttle valve
positioner potentiometer are located in the housing opposite the control cable disc.
The housing must not be opened. This means that both potentiometers, the idling switch and
the throttle valve positioner are not mechanically set or can be replaced.
All settings are performed within the basic adaptation using the -V.A.G 1552-.
When de-energized, the throttle valve moves into a specific, mechanically fixed position,
which means that the idling speed increases when the engine is warm.
The throttle valve positioner takes over the closing damping function of the throttle valve.
The throttle valve positioner can only open the throttle valve up to a certain range i.e so that
the throttle valve positioner e.g cannot accelerate at "full throttle".
Note
t If the throttle valve control unit is replaced, you must:
t Adapt the engine control unit to the throttle valve control unit
for vehicles with automatic gearbox: Adapt gearbox control unit
t
→ Rep. Gr.01
Test conditions
For vehicles 08.97 ►
l Earth line between throttle valve control unit and cylinder head o.k
For all vehicles
l Throttle valve is not damaged or dirty.
Special tools and workshop equipment required
t Vehicle system tester -V.A.G 1552 - with cable -V.A.G 1551/3-
t Handheld multimeter, e.g. -V.A.G 1526 A -
t Measuring tool set -V.A.G 1594 A -
t Test box -V.A.G 1598/22-
Check throttle valve control unit for vehicles ► 07.97
Check idling switch
– Connect vehicle system tester -V.A.G 1552- and select address word 01 "Engine
231
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→ Automatic gearbox
→ Chapter.