2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 121Get this manual
SYSTEM ANALYSIS FUEL INJECTOR OPERATION
Dynamic Tests
Use the engine Monitor screen of the diagnostic software program to monitor outboard system voltagePerform these tests while monitoring voltageIf voltage drops as RPM increases, check stator and charging system operationRun or crank outboardMonitor the injector control wire for each injector with an inductive timing lightMake certain the inductive pickup is attached to only one wireFlashes on the timing light indicate current in the circuit is being switched by the EMMThe Dynamic Tests screen allows fuel injectors or ignition to be turned off to particular cylinder
Results: Steady light activation on all injector wires and consistent voltage readings: EMM injector control function is goodIrregular or no light activation on some injector wires: Check the voltage on each circuitTest the resistance of each injector circuitMeasure resistance between the injector connector and injector control wire at the EMM connector Check battery cable connections Make sure all grounds are clean and tight Eliminate all other possibilities to isolate faulty EMMNo light activation on any injector wires (outboard cranks and starter turns flywheel): Confirm stator input (55 circuit) to EMM, CPS operation, and all grounds and wiring connectionsPossible open circuit(s), faulty CPS or EMM