2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 108Get this manual
SYSTEM ANALYSIS DIAGNOSTIC PROCEDURES
DIAGNOSTIC PROCEDURES
The key to effective troubleshooting is confirming the proper operation of each engine systemCauses of electrical failures may be difficult to isolateCheck the integrity of all connections, grounds, and wiring prior to replacing suspect componentRefer to GROUND CIRCUITS on p106Observe and run the outboard prior to performing any unnecessary proceduresInitial inspection should include the following: Observe the outboard and confirm the actual symptomsRefer to TROUBLE CHECK CHART at the end of this manual Inspect spark plugs for indication of wear, oil fowling, or damageA rich or lean running condition or evidence of internal engine damage could be identified by the appearance of the spark plugs Make sure the outboard can be turned over easilyThere should not be any mechanical binding Check the Evinrude Diagnostics Software program Profiles screen, History screen, and Persistent Faults screens for evidence of prior abnormal operationRefer to Diagnostic Software Program on p94