Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 59Get this manual
1997 DFI Troubleshooting without the DDT 1997 OFI Troubleshooting Guide Symptom 1Engine cranks but won't start Cause 1.1 Weak battery or bad starter motor, battery voltage drops below volts while cranking (ECM cuts out below volts) (Fuel pump requires volts)1.2 Low air pressure in rail (less than 70 psi at cranking) Action Replacecharge batteryInspect condition of starter motorCheck condition of battery terminals and cables
Inspect air system for leaksInspect air filter for plugging (air pressure measured on port rail)Inspect air compressor reed valves if necessaryInjection System: Listen for injector "ticking" when cranking or connect spare injector to each respective harnessTicking should start after cranking revolutionsIgnition System: -Check for proper operation by using Inductive Timing Light 91-99379-Check battery voltage (REDIYEL Lead) ignition coils- Check for blown fuse (C15)Check battery voltage to fuse from key switch (PURPLE Lead) -Check for shorted stop wire (BLKI YEL)-Check crank position sensor setting [0.015 in- 0.040 in(0.38mm1.01 mm)] from flywheel or for defective crank position sensor-Defective ECMPower Supply: Clean and inspect remote control male and female harness connectors