Skoda OCTAVIA MK1 Service Manual page 252

Test engine speed signal
Note
The engine speed signal is shown at contact 6 of the engine control unit. The signal,
amongst others, is absolutely necessary for the automatic gearbox control unit for
calculating the gear-change points and for the rev counter readout in the dash panel insert.
Connect the test box -V.A.G 1598/22 - to the wiring loom of the engine control unit
–
→ Chapter.
Check the wiring of contact 6 of the test box to the dash panel insert for interruption
–
according to the current flow diagram
Inspect throttle valve position
Special tools and workshop equipment required
t Handheld multimeter, e.g. -V.A.G 1526 A -
t Vehicle system tester -V.A.G 1552 - with cable -V.A.G 1551/3-
t Measuring tool set, e.g. -V.A.G 1594 A-
t Test box -V.A.G 1598/22-
Note
This signal serves the automatic gearbox control unit in combination with the speed to
t
calculate the gear-change points.
For vehicles ► 07.97, the signal is a rectangular signal which is given by the engine control
t
unit to contact 7.
For vehicles 08.97 ►, the signal is a rectangular signal which is given by the engine control
t
unit to contact 8.
– Connect vehicle system tester -V.A.G 1552-
– Initiate self-diagnosis of the gearbox control unit
If the fault 00545 "engine/gearbox electrical connection" is displayed by the automatic
–
gearbox control unit, interrogate the fault memory of the engine control unit
If a fault related to the throttle valve potentiometer is stored in the engine control unit,
– then first of all eliminate this fault. (The fault in the automatic gearbox control unit is only a
follow-up fault.)
If no fault related to the throttle valve potentiometer is displayed, connect the test box
–
-V.A.G 1598/22- at wiring loom to engine control unit
For vehicles ► 07.97
→ Current flow diagrams and Fitting
→ Chapter.
→ automatic gearbox → Rep.
→ Chapter.
252
locations.
Gr.01.
→ Chapter.