1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 71Get this manual
IEngine SurgesRuns Rough (Cont I SYSTEMCOMPONENT CAUSES ACTIONS
Clean and tighten Measure ground with an ohmmeter or disassemble and inspectrepair or replace as necessary Monitor voltage at fuseTest Relay CircuitSee Action StepsIgnition System Monitor voltage at PurplelWhite wiretest Stop Relay Circuit See Action StepsIgnition System Monitor voltage using OMC Diagnostic Software while running engine12V system can affect 26V outputSee Section for Charging System TestsCode 17 Test See Action StepsIgnition System Perform compression test Do visual inspection See 60 LV Service Manual Blocked water intakes, damaged water pump, thermostats or outboard installation (too high on transom)Code 22 Lack of cooling aircheck for blockageCode 25 Injector coil is open or disconnected Code 34 Perform oil pressure testSee Action StepsOil System Code 35 Test 26V systemSee Section 7Code 18