With Manufacturer's Scan Tool

Checking Injectors For Leaks and Quantity Injected

Special tools and equipment
- VAG1348/3 remote control
- VAG1348/32 adapter
- VAG1602 calibration tester







Test conditions
- Check that fuel pressure is correct. Testing and Inspection

Test sequence
- Remove fuel rail complete (fuel pipes/hoses remain connected). Refer to "Intake Manifold Lower Section, Disassembling and Assembling",

Checking for leaks
- Initiate output Diagnostic Test Mode (DTM).
The fuel pump must run.


NOTE: This work sequence allows the fuel pump to run when the engine is not running.


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

If the fuel loss is greater:
- Switch ignition off.
- Replace faulty fuel injector, item 12. Refer to "Intake Manifold Lower Section, Disassembling and Assembling",

Pay attention to the following when installing the fuel injectors:
- Replace O-rings on all fuel injectors and lightly moisten with clean engine oil.
- Insert fuel injectors vertically and in the correct position into the fuel rail and secure using retaining clips.
- Fit fuel rail with fuel injectors installed and secured onto intake manifold lower section and press in evenly.

- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
- Display readiness code.

If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, the readiness code must be generated again.

Checking injected quantity
- Insert fuel injector to be checked in measuring glass of tester for injected quantity VAG1602.







- Connect one terminal of fuel injector to be tested to engine Ground using auxiliary cables from VW1594.
- Connect second fuel injector terminal with auxiliary cable to VAG1348/3 remote control using VAG1348/3-2 adapter cable.
- Connect alligator clip to battery positive (B+).
- Initialize output Diagnostic Test Mode (DTM).
Fuel pump must run.


NOTE: This procedure allows the fuel pump to run when the engine is not running.


- Operate VAG1348/3 remote control for 30 seconds.
- Repeat check on other fuel injectors. To do this use new measuring glasses.
- After all fuel injectors have been activated, place measuring containers on a level surface and compare quantity injected.
Specified value: 110-130 ml per fuel injector

If the measured values of one or more fuel injectors are above or below the prescribed specified values:
- Replace faulty fuel injector, item 12. Refer to "Intake Manifold Lower Section, Disassembling and Assembling",
- After all fuel injectors have been activated, place measuring glasses on horizontal surface and compare injected quantity.
Specified value: 110-130 ml per fuel injector

If the measured values of one or more injectors are above or below the prescribed specified values:
- Switch ignition off.
- Replace faulty fuel injector, item 12. Refer to "Intake Manifold Lower Section, Disassembling and Assembling",

Pay attention to the following when installing the fuel injectors:
- Replace O-rings on all fuel injectors and lightly moisten with clean engine oil.
- Insert fuel injectors vertically and in the correct position into the fuel rail and secure using retaining clips.
- Fit fuel rail with fuel injectors installed and secured onto intake manifold lower section and press in evenly.

- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
- Display readiness code.

If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, the readiness code must be generated again.