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So you should have power on one side of the injector, other side is a ground, ECU grounds the injector to fire it, so you.ll need to either use a wiring diagram to check the actual wires for resistance on a digital volt meter, attach one end to the injector wire in the connector, and the other end in the appropriate spot on the connector going to the ecu and measure resistance in ohms, should be less than one ohm for continuity. If all wires test good, then using the same diagram check all grounds in the engine wiring harness, all of this assumes you can fire the injector with two wires and a 9 volt battery, use a momentary switch connected to an injector connector, and a 9v battery inline on either wire, and make sure you can hear the injector click, Rasta420
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