Audi Workshop Service and Repair Manuals

Special tools,
testers and equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598 A
• ◆ V.A.G 1598/11

Fitting location => Fitting locations overview, Page 24-6

• ‒ Before carrying out the test, make sure that the sensor is correctly installed and firmly seated.

Checking internal resistance

• ‒ Pull black 3-way connector off ignition timing sender

• ‒ → Connect multimeter between contacts 1 and 2 on sender to measure resistance.
• ‒ Specification: approx. 1 kω

If the specification is not obtained:

• ‒ Renew ignition timing sender.
• ‒ Connect multimeter between contacts 1 and 3 and 2 and 3 on sender to measure resistance.
• ‒ Specified value: ∞ω

If the specifications are not obtained:

• ‒ Renew ignition timing sender.

Checking wiring

• ‒ → With the ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector C only of engine control unit (control unit remains disconnected) .

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

• ‒ Rectify short circuit or open circuit if necessary.

=> "Current Flow Diagrams, Electrical Fault Finding and Fitting Locations" binder

• ‒ If the wiring is OK, fit a new engine control unit => Page 24-20.