Mercury 400R Verado FourStroke - Starter Motor Troubleshooting; Engine Wont Start Troubleshooting; Erratic Engine Operation

Starter Motor Will Not Crank the Engine
POSSIBLE CAUSES
• Lanyard stop switch not in RUN position.
• Blown 5‑amp fuse. Check DTS power harness circuit fuse. Refer to
Maintenance section.
• Outboard is not shifted to neutral position.
• Shift actuator failure. "Gear Shift Diff" error message shown on
VesselView.
• Weak battery or battery connections are loose or corroded.
• Ignition key switch failure.
• Wiring or electrical connection faulty.
• Starter motor solenoid or slave solenoid failure.
Engine Will Not Start
POSSIBLE CAUSES
•
Incorrect starting procedure. Refer to Operation section.
• Old or contaminated gasoline.
• Fuel is not reaching the engine.
• Fuel tank is empty.
• Fuel tank vent not open or restricted.
• Fuel line is disconnected or kinked.
•
Fuel filter is obstructed. Refer to Maintenance section.
• Fuel pump failure.
• Fuel tank filter obstructed.
• Ignition system component failure.
•
Spark plugs fouled or defective. Refer to Maintenance section.
Engine Starts But Will Not Shift Into Gear
• Shift actuator failure. "Gear Shift Diff" error message shown on
VesselView.
Engine Runs Erratically
POSSIBLE CAUSES
• Overheating ‑ Warning horn not working.
• Low oil pressure. Check oil level.
•
Spark plugs fouled or defective. Refer to Maintenance section.
• Incorrect setup and adjustments.
• Fuel is being restricted to the engine.
a.
Engine fuel filter is obstructed. Refer to Maintenance section.
TROUBLESHOOTING
120 eng