Golf L4-1781cc 1.8L SOHC (RV, PF) (1989)
Fuel Injector: Testing and Inspection
Fuel Injector
Digifant II Injectors/Pressure Regulator
Digifant II Injector Resistance
1.
A Faulty Injector can be detected by checking resistance at the main electrical connector on the end of the fuel rail. The resistance should be
between:
3.7 and 5.0 ohms
2.
If the resistance is greater, at least one Injector is faulty.
3.
To isolate a faulty Injector, disconnect the individual electrical connectors from the Injectors, one at a time, and retest. The resistance should
increase each time an Injector is disconnected.
4.
Resistance readings at the main electrical connector should be:
4 Injectors - 3.7 to 5.0 ohms
3 Injectors - 5.0 to 6.7 ohms
2 Injectors - 7.5 to 10.0 ohms
1 Injector - 15.0 to 20.0 ohms
5.
If the resistance does not increase when a particular Injector is disconnected, check the resistance directly at that Injector. The resistance for a
single Injector should be between:
15 and 20 ohms
6.
If the resistance reading at the Injector is OK, check the wiring between the main connector and the Injector connector. If the resistance reading at
the Injector is not within specifications, the Injector is faulty and should be replaced.