Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ V.A.G 1348/3A
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598/31
• ◆ V.A.G 1602
• ◆ VAS 5051 with VAS 5051/1

or

• ◆ V.A.G 1551 with V.A.G 1551/3 A

Test requirement:

• ● Fuel pressure OK. Testing .

Test sequence

• ‒ Remove fuel rail (together with injectors) from intake manifold => Page 24-45. Do not disconnect the fuel hoses.
• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
  => Page 24-20.

Testing for leaks

• ‒ Bridge contacts 1 and 65 on the test box using test leads from adapter set V.A.G 1594 A.

Only on vehicles from model year 2001 onwards with engine code ANB:

• ‒ Switch on ignition.

All models

• ‒ The fuel pump should run.
• Check injectors for leaks (visual check). When the fuel pump is running, only 1 or 2 drops should escape per minute from each injector.

• ‒ If a greater amount of fuel escapes, switch off the fuel pump (disconnect the cable bridge) and replace the faulty injector => Page 24-45.

Checking injection quantity

• ‒ Place the injector which is to be tested into a measuring glass from injection quantity tester V.A.G 1602.
• ‒ → Connect one of the injector contacts to engine earth using test lead and crocodile clamp from V.A.G 1594 A.
• ‒ Connect second injector contact to positive using remote control V.A.G 1348/3 A, adapter cable V.A.G 1348/3-2 and auxiliary cable.
• ‒ Bridge contacts 1 and 65 on the test box using test leads from adapter set V.A.G 1594 A.

Only on vehicles from model year 2001 onwards with engine code ANB:

• ‒ Switch on ignition.

All models

• ‒ The fuel pump should run.

• ‒ Activate remote control V.A.G 1348/3A for 30 seconds.
• ‒ Carry out measurement on all injectors.
• ‒ Once all four injectors have been actuated, place measuring glasses on a level surface.
• ‒ Specification for each injector: 135 ±10 ml

Note:

Export models for Brazil=> Page24-4.

• ‒ If the measured value for one or more of the injectors is outside the tolerance range, switch off the fuel pump (by disconnecting the cable bridge) and replace the defective injector => Page 24-45.

Note:

When checking the injection quantity, also check the spray pattern. The spray pattern should be the same for all the injectors.

• ‒ Install injectors together with fuel rail => Page 24-46.