Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 63Get this manual
1998 OFI Troubleshooting Guide (continued) Symptom 1Engine cranks but will not start (continued) Cause 1.8 ECM not functioning Action Injection 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 (BLKlYEL)- Check crank position sensor seting [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 connectors2Engine cranks, starts and stalls 2.1 Low air pressure in rail 2.2 Low fuel pressure in rail 2.3 Abnormally high friction in engine 2.4 Air in fuel systemlines See 1.2 See 1.3 and 1.4 Check for scuffed piston or other sources of high frictionSee 1.3 Crank and start engine several times to purgeCheck motion of throttle armStop nuts should contact block at idle and WOTCheck TPS set-upMust connect DDT with adapter harness (84-822560A5) to ECMClean and inspect male and female connectors 2.5 TPS malfunction