audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Idle/Throttle Speed Control Unit > < Tachometer Signal Test|Page 169
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Using ohmmeter, check for continuity across following terminals:
^

Connector (A) terminal 21 and relay mount (10) terminal 47 

^

Specification: approx 0 ohm 

If specification NOT OK

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Check for open circuit in wiring according to current flow diagram

If wiring OK

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Replace control unit

Idle/Throttle Speed Control Unit > < Tachometer Signal Test|Page 169