Injection Quantity, Proper Seal and Spray Pattern of Fuel Injectors, Checking

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







Special tools and equipment
- VAG1348/3A Remote control
- VAG1594A Connector test kit
- VAG1598/31 Test box
- VAG1602 Injection quantity test device

Requirement
- Fuel pressure OK, System Pressure, Fuel Pressure Regulator and Holding Pressure, Checking

Work sequence
- Remove fuel rail including fuel injectors from intake manifold. Fuel lines remain connected.
- Connect VAG1598/31 test box at wiring harness to Engine Control Module (ECM) but do not connect ECM. Scan Tool Testing and Procedures

Checking proper seal
- Bridge terminals 1 and 65 attest 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 ignition off) 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 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 attest box using wires from VAG1594A connector test kit.
- Switch ignition on.
- Fuel Pump (FP) must run
- Operate 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: 179 ± 14 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 measured values of all fuel injectors are outside specified range,
- Check fuel pressure. System Pressure, Fuel Pressure Regulator and Holding Pressure, Checking

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

- Install fuel injectors together with fuel rail.