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

Test requirements:

• ● Fuel pressure OK, checking .

Test sequence

• ‒ Remove fuel rail with injectors fitted from intake manifold . Fuel hoses remain connected.
• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit; do not connect the engine control unit => Page 24-19.

Leak test

• ‒ Jumper contacts 1 and 65 at test box with leads from adapter set V.A.G 1594A.
• ‒ Switch the ignition on.
• ‒ The fuel pump should run.
• ‒ Check injectors for leaks (visual check). When the fuel pump is running, only 1 or 2 drops a minute should escape from each injector.
• ‒ If the fuel loss is greater switch off fuel pump (remove cable bridge) and replace defective injector => Page 24-74;

Checking injection quantity

• ‒ Place the injector which is to be tested into measuring glass of injection quantity tester V.A.G 1602.

• ‒ → Connect one of the injector contacts to the engine earth using a test cable and crocodile clip from V.A.G 1594 A.
• ‒ Connect second contact of injector with remote control V.A.G 1348/3A, adapter lead V.A.G 1348/3-2 and auxiliary cable to positive.
• ‒ Jumper contacts 1 and 65 at test box with leads from adapter set V.A.G 1594A.
• ‒ Switch the ignition on.
• ‒ The fuel pump should run.
• ‒ Activate remote control V.A.G 1348/3A for 30 seconds.
• ‒ Perform measurements on all injectors.
• ‒ Once all four injectors have been actuated, place measuring glasses on a level surface.
• ‒ Specification per injector: 179 ±14 ml

• ‒ If measured values for one or more injectors are outside tolerance, switch off fuel pump (switch off ignition) and replace defective injector => Page 24-74.
• ‒ If the measured values for all the injectors are outside the tolerance range, check the fuel pressure => Page 24-59.

Note:

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

• ‒ Install injectors with fuel rail => Page 24-76.