Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 68Get this manual
IGNITION
DFI Troubleshooting Guide (continued) Symptom 1Engine cranks but will not start (continued) Cause 1.9 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 (REDYEL Lead) ignition coils Check for blown fuse (C15) Check battery voltage to fuse from main power relay (PURPLE Lead) Check for shorted stop wire (BLKYEL) Check crank position sensor setting [0.015 in 0.040 in(0.38mm 1.01mm)] 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 2.0 Low air pressure in rail 2.1 Low fuel pressure in rail 2.2 Abnormally high friction in engine 2.3 Air in fuel systemlines 2.4 TPS malfunction See 1.2 See 1.2 and 1.3 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