With Manufacturer's Scan Tool
Check Injectors For Leaks And Quantity Injected
Special tools, test equipment and auxiliary items
- V.A.G 1348/3 Remote control
- V.A.G 1348/3-2 Adapter
- V.A.G 1602 Calibration tester
Test conditions
Check that the fuel pressure is in order, Checking fuel pressure regulator and holding pressure. Testing and Inspection
Test sequence
WARNING! Fuel system is under pressure! Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.
- Disconnect connectors from injectors.
- Remove fuel rail complete.
- Pull vacuum hose from fuel pressure regulator.
- Lift fuel rail with injectors off intake manifold and support it.
Checking for leaks
- Initiate output Diagnostic Test Mode (DTM (the fuel pump must run). [1][2]Output Diagnostic Test Mode (DTM) (Function 03)
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 off ignition.
- Replace malfunctioning injector, item 10.
Pay attention to the following when installing the injector:
- Replace O-rings on all injectors and lightly moisten 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.
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory, checking and erasing DTC memory. Reading Diagnostic Trouble Codes
- Read-out the readiness code. If the DTC memory has been erased or the engine control module was disconnected from permanent positive, the readiness code must be generated again. Monitors, Trips, Drive Cycles and Readiness Codes Monitors, Trips, Drive Cycles and Readiness Codes
Checking injected quantity
- Insert injector to be checked in a measuring glass of tester for injected quantity V.A.G 1602.
- Connect one contact of the injector to be tested to engine Ground using auxiliary cables from V.A.G 1594.
- Connect second injector contact with auxiliary cable to remote control V.A.G 1348/3 using adapter cable V.A.G 1348/3-2.
- Connect alligator clip to battery (+).
- Initiate output DTM (the fuel pump must run). [1][2]Output Diagnostic Test Mode (DTM) (Function 03)
NOTE: This work sequence allows the fuel pump to run when the engine is not running.
- Operate remote control V.A.G 1348/3 for 30 seconds.
- Repeat check on the other injectors. To do this use new measuring glasses.
- After all injectors have been activated, place the measuring glasses on a horizontal surface and compare the injected quantity.
Specification: 135 - 165 ml per injector
If the measuring values of one or more injectors are above or below the prescribed specifications:
- Switch off ignition.
- Replace malfunctioning injector, item 10.
Pay attention to the following when installing the injector:
- Replace O-rings on all injectors and lightly moisten 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.
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory, checking and erasing DTC memory. Reading Diagnostic Trouble Codes
- Read-out the readiness code. If the DTC memory has been erased or the engine control module was disconnected from permanent positive, the readiness code must be generated again. Monitors, Trips, Drive Cycles and Readiness Codes Monitors, Trips, Drive Cycles and Readiness Codes