Injectors, Checking For Leaks and Quantity Injected

Injectors, Checking For Leaks And Quantity Injected







Special Tools, Testers And Auxiliary Items Required
- Remote control V.A.G 1348/3
- Adapter V.A. G 1348/3-2
- Injection rate tester V.A.G 1602
- Adapter set V.A.G 1594 C

Requirements
- Fuel pressure must be within specification, checking. Fuel Pressure Regulator and Residual Pressure

Work sequence







- Disconnect connector from all injectors.
- Remove fuel rail securing bolts.
- Pull off vacuum hose from fuel pressure regulator.
- Lift fuel rail along with injectors off intake manifold and support (fuel lines remain connected).

Checking for leaks
- Initiate output Diagnostic Test Mode (DTM) with Vehicle Diagnosis, Testing and Information System VAS 5051. Programming and Relearning

NOTE: This step serves only to have the fuel pump running when the engine is stopped.

- Check injectors for leaks (visual check).
- Only 1 to 2 drops per minute may emit from each valve when fuel pump is running.

If the fuel loss is greater:
- Switch off ignition.
- Replace faulty injector

Checking quantity injected
- Insert injector to be checked into measuring beaker of injection rate tester V.A.G 1602.







- Connect one contact of injector to be tested to engine Ground using auxiliary cables from V.A.G 1594 C.
- Connect second contact of injector with auxiliary cables to remote control V.A.G 1348/3 with adapter cable V.A.G 1348/3- 2.
- Connect alligator clip to battery (+).
- Initiate output DTM with Vehicle Diagnosis, Testing and Information System VAS 5051.

NOTE:
- This step serves only to have the fuel pump running when the engine is stopped.
- In the following injection quantity test, the spray pattern must also be checked. The pattern must be the same for all injectors.

- Operate remote control V.A.G 1348/3 for 30 seconds.
- Repeat check on other injectors. Use new measuring beakers.
- After all injectors have been activated, place measuring beakers on a horizontal surface and compare injected quantity.
- Specification: 135165 ml per valve

If the measured values of one or more injectors are above or below the prescribed specifications:
- Switch off ignition.
- Replace faulty injector

Observe the following when installing injectors:
- Replace O-rings on all injectors and lightly moisten them with clean engine oil.
- Insert injectors vertically and in the correct position into the fuel rail and secure with retaining clips.
- Fit fuel rail with secured injectors onto intake manifold and press in evenly.
- Interrogate Diagnostic Trouble Code (DTC) memory of engine control module. If necessary, correct fault(s) and erase DTC memory. Manufacturer's Scan Tool