audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Understanding Track Style Wiring Diagrams, Important Stuff !|Page 860 > < Understanding Track Style Wiring Diagrams, Important Stuff !|Page 858
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Hall Effect Sensor: Testing and Inspection

Hall sending unit, checking

Note:  Ignition coil wire from distributor must always be grounded with jumper wire when checking Hall sending unit.

Work sequence

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Remove protective cover from Hall sending unit connector on ignition distributor and unplug connector from unit (arrow)

-

Connect voltmeter to terminals 1 and 3 of connector D

-

Switch ignition ON
^

specifications: minimum 9 V 

If specifications NOT OK

-

Check for open circuit in wiring to Hall sending unit according to current flow diagram

If specification OK

-

Switch ignition OFF

-

Nove back protective cover on Hall sending unit connector

-

Connect voltmeter across wires for terminals 1 and 2
Plug connector back into Hall sending unit on distributor

-

Switch ignition ON

-

Remove distributor cap, rotor and dust cover

Note:  Distributor cap retaining clips must not interfere with Hall sending unit during test.

Understanding Track Style Wiring Diagrams, Important Stuff !|Page 860 > < Understanding Track Style Wiring Diagrams, Important Stuff !|Page 858