Open Fuel Injectors, Checking

Open Fuel Injectors, Checking

Special tools, testers and auxiliary items required

• Torque Wrench 5-50 Nm (V.A.G 1331)

• Ratchet, Reversible (V.A.G 1331/1)

• Tool Insert, AF 17 (V.A.G 1331/6)

• Socket (T40055)

• Plug (T40204)


• Follow the guidelines for a clean working environment when working on the fuel system. Refer to => [ Fuel System ] Fuel System.

• Always follow these rules before and during work.

- Erase the Diagnostic Trouble Code (DTC) memory from the Engine Control Module (ECM).

- Remove engine cover. Refer to => [ Engine Cover ] Service and Repair.

- Clean all connections, for example with commercially available detergent, before removing.

• Maintain clean working conditions. Contamination must not enter the fuel system.

• Check one cylinder after another.

- Dry all cleaned components.

Begin with cylinder 1.

- Remove the union nut on the cylinder 1 fuel rail and loosen the union nut on the injector unit just a little using the (T40055). Seal the open connection on the injector line.

- Seal the open connection with the (T40204).

- The connector for the injector that will be checked must be connected.

- Erase all DTC memories.

- Perform a road test.

• If the correct injector is found, there will not be a DTC memory regarding "positive control deviation".

• There could be other DTCs. These new DTCs can be ignored. They are occurring as a result of the work being done.

- After the road test, check the DTC memory. If there is a DTC regarding "positive control deviation", repeat the steps for all connections until the DTC is no longer present after a road test.

Follow the installation instructions for all injector lines.

- Coat the threads on the union nuts with fuel.

- Tighten the union nuts for the high-pressure lines by hand. Make sure it fits free-of-tension.

- High pressure lines, installing. Refer to => [ High Pressure Lines ] Service and Repair.