Open Fuel Injectors, Checking: Procedure

-- Erase the fault stored in the Diagnostic Trouble Code (DTC) memory using the Vehicle Diagnostic Tester.

-- Remove the engine cover, refer to ENGINE COVER .

CAUTION:

Danger of malfunction caused by dirt.

Follow the guidelines for clean working conditions, refer to CLEAN WORKING CONDITIONS .

-- Follow the guidelines for clean working conditions, refer to CLEAN WORKING CONDITIONS .

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

NOTE:

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

Check one cylinder after another.

-- Dry all cleaned components.

Begin with the cylinder 1.

-- Remove the noise insulation.

Fig 1: Identifying Return Line Connection

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Disconnect the return line connections on the fuel injectors, to do so push the releases upward -arrows-.

-- Connect the clean adapter that has been cleaned out using compressed air to the fuel return line connection on the injector that is being checked.

Fig 2: Identifying Hand Vacuum Pump

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- A vacuum pressure of -500 mbar (-7.25 psi) is applied using the Hand Vacuum Pump VAS6213.

Fuel injectors are OK when the pressure remains constant for about 30 seconds.

If the injectors are faulty, then the pressure will drop to 0 bar again within 2 to 3 seconds.

Repeat the test if necessary. Watch the Hand Vacuum Pump VAS6213 for a loss of pressure.

-- Replace any defective fuel injectors, refer to FUEL INJECTORS, REMOVING AND INSTALLING .

-- Install the engine cover, refer to ENGINE COVER .