Injection Quantity Proper Seal & Spray Pattern - Fuel Injectors

Injection Quantity, Proper Seal And Spray Pattern Of Fuel Injectors, Checking

Special Tools and Equipment







- VAG1348/3A
- VAG1594A
- VAG1598/31
- VAG1602
- VAS5051 with VAG5051/1

Test requirement:
- Fuel pressure OK. Testing and Inspection

Test sequence
- Remove fuel distributor including fuel injectors from intake manifold. Fuel lines remain connected.
- Connect VAG1598/31 test box at wiring harness to Engine Control Module (ECM), do not connect ECM. Refer to "Scan Tool Testing/Wire and Component Testing Using VAG1598/31 Test Box" Testing and Inspection

Checking Proper Seal
- Bridge terminals 1 and 65 at test box using wires from VAG1594A adapter test kit.
- Switch ignition on.
- Fuel Pump (FP) must run.
- Check proper seal of fuel injectors (visual inspection). With Fuel Pump (FP) running, only 1 to 2 drops per minute may drip out per injector.
- If fuel loss is greater, stop Fuel Pump (FP) from running (switch off ignition) and replace faulty fuel injector.

Checking Injection Quantity
- Insert fuel injector to be tested in a measuring glass from VAG1602 injection quantity test device.







- Connect one terminal of fuel injector to engine Ground (GND) using an adapter cable and an alligator clip from VAG1594A connector test kit.
- Connect the second terminal of fuel injector to B- using VAG1348/3A remote control, VAG1348/3-2 adapter cable and assisting cable.
- Bridge terminals 1 and 65 at test box using wires from VAG1594A adapter test kit.
- Bridge terminals 1 and 65 at test box using wires from VAG1594A adapter test kit.
- Switch ignition on.
- Fuel Pump (FP) must run.
- Activate VAG1348/3A remote control for 30 seconds.
- Perform measurement on all fuel injectors.
- After all four fuel injectors have been activated, place measuring glasses on an even surface.
- Specified value for each fuel injector: 135 = 10 ml
- If measured value of one or more fuel injectors is outside of specified range, switch Fuel Pump (FP) off (switch ignition off) and replace faulty fuel injector.
- If the measured values of all fuel injectors are outside the specified range, check fuel pressure. Testing and Inspection


NOTE: Also check spray pattern when checking injection quantity. Spray pattern must be the same for all injectors


- Install fuel injectors together with fuel distributor.