Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598/31

Fitting location => Fitting locations overview, Page 24-5

Note:

The engine speed sender is a combined speed sender and reference mark sender. Without a signal from the -G28 the engine cannot be started. If the signal from the -G28 fails while the engine is running, the engine will cut out immediately.

Test sequence

• ‒ Before carrying out the test, make sure that the sender is correctly installed and firmly seated.
• ‒ Unplug connector for engine speed sender (grey connector).
• ‒ → Connect multimeter (resistance measurement range) between contacts 1 and 2.
• ‒ Specification: 450 ... 1000 ω

If the specification is not attained:

• ‒ Fit a new engine speed sender.

If the specification is obtained:

• ‒ → Connect multimeter (resistance measurement range) between contacts 1 and 3 (screening) and between contacts 2 and 3 (screening).
• ‒ Specification: ∞ ω(no continuity)

If the specification is not attained:

• ‒ Fit a new engine speed sender.

If the specification is obtained:

• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
  .

• ‒ → Test for open circuit and short to positive or earth in the following wiring connections:

• ‒ Rectify any open/short circuit as necessary.

If no fault is detected in the wiring:

• ‒ Fit a new engine control unit => Page 24-24.