1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 65Get this manual
Step 4: If engine won't crank, check the following: Main battery switch (if present) Battery and connections Position fusego to Diagnostic Guide &
To prevent injury, all spark plug leads must remain connected to spark tester adjusted to 7116 in(11 mm) during all cranking testsDo not attach spark tester to the ECU or its bracketsBe sure spark tester is held at least inches away from all wires and sensor leads
Step 5: If engine will crank but not start, perform cranking spark test with tester adjusted to 7116 in(11 mm)
Engine will crank over as long as Position fuse is okay regardless of condition of remaining six fusesResults: Steady spark on allfault is in fuel or electrical systemGo to Step No spark on some or allnote problem cylindersGo to appropriate symptom in Diagnostic Guide
Step 6: If engine will run, perform the following tests (while problem is occurring, if possible): INotel OMC Diagnostic Software is able to perform cylinder drop tests, as well as provide live engine data, and should be used with the following procedures