Testing Fuel Injectors
The Digifant I fuel injectors are basically the same as those used in Digifant II. The difference on Digifant I fuel injectors is that there is one power supply serving all injectors, but a separate ground wire for each injector. The control unit still makes the ground connection to open the injectors, all at the same time. The separate ground wire allows the control unit to monitor the operation of each injector to detect faults.
This heading covers only the electrical tests of Digifant I injectors. For a description of fuel injector operation or for injector removal and installation, see 4.8 Fuel Injectors (Digifant II). For the following tests to be valid, the Hall sender must be operating correctly. See IGNITION for more information.
To test Digifant I injectors:
If, in the LED tests, the test light is on continuously, the ground wire between the battery and the control unit may be faulty. Check the connection and replace the wire if necessary. If the test light does not flicker at all, check the wiring between the connector and the control unit and repair any faults. If the wiring is OK, then the control unit is most likely faulty.
If any of the injector resistance readings are incorrect, disconnect the harness connector for that injector and check the wiring. If the wiring is OK, then the injector is most likely faulty.
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