Audi Workshop Service and Repair Manuals

Electrical test of commencement of injection valve

• ‒ Unplug connector for commencement of injection valve
  =>Fitting locations overview, Page 23-4.

Measuring resistance on vehicles with 3-pin connector:

• ‒ → Connect hand-held multimeter (resistance test range) between contacts 2 and 3.

• Specification: 12...20ω

Measuring resistance on vehicles with 10-pin connector:

• ‒ → Connect hand-held multimeter (resistance test range) between contacts 9 and 10.

• Specification: 12...20 ω

If the specification is not obtained:

• ‒ Renew commencement of injection valve (N108).

If the specification is obtained:

Testing voltage supply of commencement of injection valve

Measuring voltage on vehicles with 3-pin connector:

• ‒ → Connect hand-held multimeter (voltage test range) between engine earth and contact 3 on the connector.
• ‒ Switch ignition on.

• Specification: approx. battery voltage

Measuring voltage on vehicles with 10-pin connector:

• ‒ → Connect hand-held multimeter (voltage test range) between engine earth and contact 10 on the connector.
• ‒ Switch ignition on.

• Specification: approx. battery voltage

If the specification is not 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.
  .

The following wiring connections are to be checked for open circuits and/or short to positive or negative.

→ Testing wiring connection on vehicles with 3-pin connector.

→ Testing wiring connections on vehicles with 10-pin connector.

• ‒ Rectify any open/short circuit as necessary.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder