Audi Workshop Service and Repair Manuals

Special tools,
testers and equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1527 B
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598 A
• ◆ V.A.G 1598/12
• ◆ VAS 5051 with VAS 5051/1

• or

• ◆ V.A.G 1551 with V.A.G 1551/3 A

Checking internal resistance

• ‒ Unplug connector on injector to be checked.

• ‒ → Connect multimeter to injector to measure resistance
• ‒ Specification
  Bosch injector: 15 ... 17 ω
  Siemens injector: 13,5 ... 15,5 ω

If the specification is not obtained:

• ‒ Renew injector.

Checking power supply

Test requirements:

• ● Fuel pump relay OK; checking .

• ● → Fuse S234 OK (in fuse holder, position 34).

• ‒ Unplug connector on injector to be checked.

• ‒ → Connect voltage tester V.A.G 1527 B as follows:

• ‒ Start final control diagnosis and actuate fuel pump relay -J17.
• ‒ The LED should light up.

If the LED does not light up:

• ‒ Check wiring from contact 1 via fuse S234 (in fuse holder, position 34) to fuel pump relay:

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

Checking activation

• ‒ Unplug connector on injector to be checked.

• ‒ → Connect voltage tester V.A.G 1527 B as follows:

• ‒ Operate the starter briefly (the engine may start).
• ‒ The LED should flash.

If the LED lamp does not flash:

• ‒ Check wiring =>, Page 24-36

If the LED does not flash for any of the injectors:

• ‒ Check the power supply to the engine control unit => Page 28-31.

Checking wiring

• ‒ Unplug connector on injector to be checked.

• ‒ → With the ignition switched off, use adapter V.A.G 1598/12 to connect test box V.A.G 1598 A to connector D only of engine control unit (control unit remains disconnected) => Page 24-17.

• ‒ → 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