Audi Workshop Service and Repair Manuals

Installation position of sender and plug connection => Fitting locations overview, Page 24-5.

• ‒ Unplug the connector of the engine speed sender (identification: grey connector).
• ‒ → Connect hand-held multimeter V.A.G 1526 for resistance measurement to contacts 1 and 2 using adapter cables from V.A.G 1594.
• ‒ Specified value: 480 ... 1000 ω.
• ‒ If the value does not match the specified value, fit a new engine speed sender.
• ‒ If the specified value is obtained, connect an ohmmeter to contacts 1 and 3, plus to contacts 2 and 3.
• ‒ Specified value: infinite resistance (open circuit)
• ‒ If the value does not match the specified value, fit a new engine speed sender.

• ‒ If the specified values are met, check the wiring between the sender connector and the Motronic control unit as follows:
• ‒ Connect test box V.A.G 1598/19 to the wiring harness of the Motronic control unit.
• ‒ → Check for open circuit and short to ground or positive in wiring from sender connector ...

• ‒ → ... to Motronic control unit -J220 according to current flow diagram.

• ‒ If none of the tests up to this point have revealed a fault, replace the Motronic control unit.