Skoda OCTAVIA MK1 Service Manual page 238

Read off throttle valve angle in display field 3.
Specified value: 1.9...5.7 ∠°.
Slowly open the throttle valve completely and by doing so
–
observe the angle indicator in display field 3. The numerical
value must increase evenly over the total range.
– End the test using the function 06 "End output".
Note
The indicated value is dependent on the tolerances of the
throttle valve potentiometer and does not correspond to the
actual opening angle.
The numerical value does not increase evenly:
– Replace throttle valve control unit
If the display stays at constant:
Check voltage supply and cables to throttle valve control unit
–
→ Anchor.
Check throttle valve positioner and throttle valve
potentiometer
Test condition
l Coolant temperature at least 80 °C
Test sequence
Connect vehicle system tester -V.A.G 1552- and select
–
address word 01 "Engine electronics". Engine idling.
Select 08 for the function "read measured value block" and
–
further select display group 001.
In display field 2 check whether the coolant
temperature is above 80 °C.
– Switch over in the display group 098:
Check the voltage value for the throttle valve opening of
the potentiometer for the throttle valve positioner in
display field 2.
Specified value: 2.28...4.75 V
If the specified value is not reached:
– End the test using the function 06 "End output".
– Remove intake hose.
– Unplug plug -1- from the throttle valve
→ Chapter.
Reading measured value block 1
->
850/rpm
238
Reading measured value
block 3
->
0/min 0 mg/s
%
90°C 0.80 V
Reading measured value block 98
->
4.20 V 3.48 V
00
3.2.∠° 0
0000010
00000000