90CS Quattro V6-2.8L (AFC) (1995)
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Data Link Connector: Description and Operation
Diagnostic Signal
OPERATION
The Diagnostic Signal is connected to pin C 12 of the Engine Control Module, the signal is directional OUT only (PIN C 12 - OUTPUT ONLY).
PURPOSE
The diagnostic signal is used for communication between the Engine Control Module and special tool V.A.G. 1551.
SIGNAL FAILURE
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When there is a break in the signal wiring (K-wire), the following text appears on the V.A.G. 1551: "control module does not answer".
