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HOMESERVICE MANUALSVOLKSWAGEN2012JETTA TDI, 4D SEDAN, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 188 (2.0L - DIESEL FUEL INJECTION - ENGINE CODE: CVCA (HATCHBACK))23 DIESEL FUEL INJECTIONDIAGNOSIS AND TESTINGOPEN FUEL INJECTORS, CHECKINGPROCEDURE
2012 Volkswagen Jetta TDI, 4D Sedan, Standard Trans

Open Fuel Injectors, Checking: Procedure

2012 Volkswagen Jetta TDI, 4D Sedan, Standard TransSECTION Procedure
WARNING: This page is about a different car, the 2015 Volkswagen Beetle. However, it is still accessible from the selected car via links, so may be relevant.

-- Erase the fault stored in the 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 .

-- 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
GWWA23-10697Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Disconnect the return line connections on the fuel injectors, to do so push the releases upward in direction of -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
GWWN20-10861Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- A vacuum pressure of -500 mbar is applied using the Hand Vacuum Pump VAS 6213.

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 VAS 6213 for a loss of pressure.

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

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

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.