1999 "EE" Evinrude 70HP 4-Stroke Service Manual, P/N 787023, Page 42Get this manual
When cranking the engine, the ECU determines the starting fuel injection duration for all cylinders from the "starting map"(stored in ROM), based on the measured atmospheric pressureThen, it controls all fuel injectors for cylinders #1 through #4 to start injecting the determined fuel amount every time any piston stroke is positioned at 65 BTDCThis mode is in effect until the engine reaches starting speed of 440 RPMThe ECU thus provides rich mixture for engine starting by increasing fuel injector durationAbove 440 RPM, the ECU changes from the "starting map" to the "normal map", and shifts the fuel injection duration to normal cruisingIf engine starting was unsuccessful, and the engine speed drops to 50 RPM, the ECU judges that the engine has stalled Two seconds later, the ECU will cease fuel pump operation During IdlingTrolling:
During engine idling or trolling, the ECU uses the idle and trolling section ofthe "normal map" in accordance with the "ON" signal from CTP (Closed Throttle Position) switch