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This is a short in either the injector wiring harness or the computer needing replaced.One other issue is if one of the injectors is shorted internally it can back feed and cause this here.Try unplugging each injector one at a time and see if the constant signals go away.If they do when one is unplugged then the affected injector needs replaced.If they do not then the fault is in the wiring harness or engine computer.Trace the harness looking for any shorts or damage needing repaired or replaced.If the harness looks o.k. then the engine computer needs replaced.
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