With Manufacturer's Scan Tool
Fuel injectors, checking
WARNING!
Fire hazard! Do not smoke, work near heaters or open flame, or have anything nearby that could ignite fuel. The fuel system is under pressure. Before opening, cover connections with a rag, and open carefully to release pressure.
Activating fuel injectors via output Diagnostic Test Mode (DTM).Output Diagnostic Test Mode (DTM) (Function 03)
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 signal from ECM
- Disconnect harness connector from cylinder 1 fuel injector.
- Connect VAG 1527B LED voltage tester between connector terminals (to ECM), using adapter cables from VW 1594 connector test kit.
- Disconnect harness connectors from fuel injectors for cylinders 2-6.
- Crank starter briefly to check voltage supply for cylinder 1 fuel injector.
LED must flicker.
- Repeat test for fuel injectors for cylinders 2-6.
If LED does not flicker:
- Switch ignition off.
- Connect VAG 1598/22 test box to ECM harness connector.Connecting VAG 1598/22 Test Box
- 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
- Cyl. 5 fuel injector terminal 2 to ECM/test box socket 72
- Cyl. 6 fuel injector terminal 2 to ECM/test box socket 79
- 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
Fuel injector resistance, checking
- Check resistance of individual fuel injectors.
Specified value: 13.5-15.5 Ohms
If resistance is NOT OK:
- Replace affected fuel injector.