Fuel Injector Actuation, Checking

Fuel Injector Actuation, Checking

Triggering fuel injectors via output Diagnostic Test Mode (DTM) Refer to "Scan Tool Testing/Output Diagnostic Test Mode (DTM) (Function 03)" Testing and Inspection

Required special tools and test equipment
- VAG 1598/22 test box
- Multimeter US 1119 (Fluke 83 or equivalent)
- VAG 1527B LED voltage tester
- VW 1594 connector test kit
- Wiring diagram

Test requirements
- Fuse for fuel injectors OK
- Engine speed (RPM) sensor OK
- Fuel pump relay OK

Checking







- Disconnect harness connector from cylinder 1 fuel injector.
- Connect VAG 1527B LED voltage tester between connector terminals (to ECM), using adapters from VW 1594 connector test kit.
- Disconnect harness connectors from fuel injectors for cylinders 2, 3 and 4.
- Crank starter briefly to check voltage supply for cylinder 1 fuel injector. LED must flicker.
- Repeat test for fuel injectors for cylinders 2, 3 and 4.

If LED does not flicker:
- Switch ignition off.
- Connect VAG 1598/22 test box to ECM harness connector. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/22 Test Box" Testing and Inspection
- Check wiring for open circuits between ECM/test box and fuel injector harness connectors:
- Cyl. 1 fuel injector terminal 2 to ECM/test box socket 73
- Cyl. 2 fuel injector terminal 2 to ECM/test box socket 80
- Cyl. 3 fuel injector terminal 2 to ECM/test box socket 58
- Cyl. 4 fuel injector terminal 2 to ECM/test box socket 65
- Specified value: max. 1.5 Ohms

- Check wiring for open circuit between fuel injector connector terminal 1 and relay panel, according to wiring diagram.
Specified value: max. 15 Ohms

- Check wiring for short circuits between wires and connector terminals.
Specified value: Infinity Ohms