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Testing signals from/to dash panel insert
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 by the engine control unit.
Identify the engine speed signal as follows:
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‒ Connecting 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:
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‒ Locate open circuit or short circuit between engine control unit and the control unit concerned.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
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