Fuel Injectors, Checking

FUEL INJECTORS, CHECKING

Special tools, testers and auxiliary items
- VAG 1598/18 test box
- Multimeter (Fluke 83 or equivalent)
- VAG 1527B voltage tester
- VW 1594 connector test kit
- Wiring diagram

Check conditions
- Engine speed sender OK.
- Fuel pump relay OK

Checking activation





- Disconnect harness connector -1- from connector -2- and connect VAG 1527B voltage tester to connector -1- using adapter cables from VW 1594 test kit.
- Operate starter and check fuel injector voltage supply.
- LED must flicker
- Repeat check on fuel injectors 2, 3 and 4.

If LED does not flicker:
- Switch ignition off.





- Connect VAG 1598/18 test box to ECM wiring harness.





- Check wiring for open circuits between test box and connector, according to wiring diagram.
- Cyl. 1 fuel injector: terminal 2 and test box socket 24
- Cyl. 2 fuel injector: terminal 2 and test box socket 2
- Cyl. 3 fuel injector: terminal 2 and test box socket 25
- Cyl. 4 fuel injector: terminal 2 and test box socket 26
- Wire resistance: Max.1.5 Ohms
- Check wiring for open circuit between fuel injector connector terminal 1 and relay panel, according to wiring diagram.

Wire resistance: Max. 1.5 Ohms

- Additionally check wires for short to one another.

Specification: Infinity Ohms (no continuity)

Checking fuel injector resistance





- Check resistance of fuel injectors individually.

Specification: 15 - 20 Ohms

If the specification is not attained, replace fuel injector(s) as necessary.