audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Engine Speed Sensor > < Tachometer Signal Test|Page 2887
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Using ohmmeter, check for continuity across following terminals:
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Connector (A) terminal 21 and relay mount (10) terminal 47 

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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

Engine Speed Sensor > < Tachometer Signal Test|Page 2887