Mercury Optimax Diagnostic Guide., Page 24Get this manual
OPTIMAX DIAGNOSTIC GUIDE
WARNING
When ignition load (spark) testing is required on any conventional EFI engine (non direct fuel injection), make sure to follow the safety precautions listed in the Preface Section of the DDT reference manualIf there are fuel vapors present in the engine, the ignition load (spark) test could ignite the fuel vapors and cause the engine to backfireAn engine backfire condition may result in internal engine damagePurge fuel vapors from the system if requiredThis test is run with the key switch in the RUN position only (engine off)To test the ignition coil output press the keyDISCONNECT POWER TO HIGH PRESSURE FUEL PUMP PRESS TO CONTINUE Press the key DO YOU WISH TO RUN TEST WITH ANY SPARK PLUGS IN CYLINDER? 1=YES 2=NO Press the key THIS IS KEY ON ONLY STATIC TESTPRESS TO CONTINUE PRESS MODE TO CANCEL Press the key SELECT CYL TO TEST: 12345678 PRESS MODE TO CANCEL Press the key IGNITION COIL TEST IN PROGRESSPress the key PURGE FUEL VAPORS PRIOR TO TESTPRESS TO CONTINUE PRESS MODE TO CANCEL Press the key ECM HAS RECEIVED PASS RESPONSE FROM THE COIL DRIVER PRESS TO CONTINUE Press the key THIS IS KEY ON ONLY STATIC TESTPRESS TO CONTINUE PRESS MODE TO CANCEL Press the key USE ONLY RESISTOR TYPE SPARK PLUG TO VIEW EXTERNAL SPARK CONTINUE? 1=YES 2=NO Press the key