Fuel Injectors, Checking Injection Quantity and Seal

Diagnostic Procedures



Injection Quantity, Checking

- Insert a fuel injector to be tested into a measuring tube of VAG 1602 tester for fuel injection quantity.





- Using adapter cables, connect one terminal of fuel injector to be checked to engine Ground (GND).

- Connect second fuel injector terminal with adapter cable to remote control (V.A.G. 1348/3A with adapter cable (V.A.G 1348/3-2)).





- Connect alligator clip of remote control to positive terminal in engine compartment.

- Bridge sockets 1 + 65 of test box with respective adapter cables. Fuel Pump (FP) (G23) must run.

• This work step allows the fuel pump to run when the engine is not running.

- Switch ignition on.

- Operate remote control for 30 seconds.

- Repeat check on other injectors. To do this use new measuring beakers.

- Disconnect connection between test box sockets.

- Switch ignition off.

- After all injectors have been activated, place measuring glasses on a horizontal surface and compare the injected quantity. Specification: 128 to 140 ml per injector

If the tested value of one or more fuel injectors is below or above the indicated specified value:

- Replace faulty fuel injector.

When installing fuel injector, observe the following:

• Replace O-rings on all injectors and lightly moisten with clean engine oil.

• Insert fuel injectors into fuel rail perpendicular and in correct position, and secure them with retaining clips.

• Position fuel rail with secured fuel injectors on intake manifold and apply uniform pressure to press it in.

• The connectors must audibly engage in the injectors when pushed on.

- Erase DTC memory of Engine Control Module => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09, Diagnostic mode 4: Reset/erase diagnostic data.

- Generate readiness code => [ Readiness Code, Generating ] Monitors, Trips, Drive Cycles and Readiness Codes.