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Checking auxiliary signals
Checking engine speed signal
Note:
The engine speed signal is taken from contact 37 of the engine control unit. The signal is used, among other things, for the engine speed display in the dash panel insert.
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‒ Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; the engine control unit should not be connected .
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‒ Check for open circuit and short to positive or earth in the following wiring connections:
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Test box
V.A.G 1598/31
Socket
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Instrument cluster:
contact
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37
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=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
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‒ Rectify any open/short circuit as necessary.
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