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Audi Workshop Service and Repair Manuals

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Checking throttle valve positioner > < Checking selector lever position on automatic gearbox

A3 Mk1

Motronic fuel injection and ignitionsystem (4-cyl. turbo)
Cheocking auxiliary signals
Checking engine speed signal

The engine speed signal is required for the rev counter, air conditioner and automatic gearbox.

However, since the signal cannot be read in the form in which it is generated by the engine speed sensor (G28), it has to be processed beforehand by the engine control unit.

Determine the engine speed, as follows:

  • ‒ Connect the V.A.G 1551 fault reader
    and perform "Automatic Test Sequence 00".

No faults relating to a "missing engine speed signal" should be stored in any of the control units.

If one of the control units indicates a fault:

  • ‒ Determine open circuit or or short circuit between engine control unit and the control unit concerned.

=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations binder

Checking throttle valve positioner > < Checking selector lever position on automatic gearbox