1999 "EE" Evinrude 200, 225 V6 FFI Outboards Service Manual, P/N 787025, Page 53Get this manual
Ignition System Components
The FFI ignition system presents serious shock hazardThe primary circuit operates at 250 volts; the secondary circuit operates in excess of 35,000 voltsUse caution to avoid injury from shock, or injury from your reaction to shockDo not handle primary or secondary ignition components while the engine is cranking or runningFuse
One fuse in the Power Distribution Panel protects the ignition systemThe fuse in Position is in the 40V circuit to the ECUIf it fails, the ignition system will no longer function
40 Amp Relay
A 40 amp relay (Position 8) in the Power Distribution Panel supplies switched 12V circuit to the ECUIf it fails, the ignition system will no longer function, or it may not shut offElectronic Control Unit (ECU)
The Electronic Control Unit (ECU) controls ignition system operation and is water cooledThe ECU controls ignition coil operation by making or breaking internal ECU ground circuitsThis triggers individual SCR's inside the ECU that control coil primary circuit operation and plug firingAn internal ECU failure could affect the firing of one or more cylindersA fuse, Position 7, protects both the (B+) circuit to the ECU and the circuit to the key switchIf it fails, the ignition will no longer functionStart Assist Circuit