With the ignition off, disconnect the Hall sender harness connector and the fuel injector harness connector. Using a voltmeter, check for voltage between the outer terminals of the Hall sender connector as shown in Fig. 3-12 above. When the ignition is turned on, there should be a minimum of 10 volts. Turn off the ignition. If there is no voltage, check for continuity in the wiring between terminal 3 of the Hall sender connector and terminal 30 of the Digifant control unit connector, and between terminal 1 of the Hall sender connector and ground. Repair any breaks as necessary. If the wiring is OK, then the control unit is most likely faulty. Reconnect the Hall sender harness connector.