S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
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Data Link Connector: Description and Operation
Diagnostic Signal
The Diagnostic Signal is connected to pin 55 of the Motronic control module, the signal is bidirectional (PIN 55 - INPUT + OUTPUT).
The diagnostic signal is used for communication between the Motronic 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".
