Suzuki DF15AS Troubleshooting
| Engine Model: Suzuki DF15AS |
| Engine Type: 4-stroke 2-cylinder OHC short shaft gasoline outboard engine |
| Total Displacement: 20.1 cu.in (327 cc) |
| Rated Engine Power: 15 Hp (11 kW) at 6000 rpm |
| Fuel System: Multi-point sequential electronic fuel injection |
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| Engine hard starting or not starting |
Empty fuel tank - Add gasoline.
Incorrect fuel grade - Use correct fuel grade.
Dirty fuel lines - Inspect and clean.
Spark plug wiring connection is defective - Check spark plug wiring connection, repair or change.
Damaged spark plug - Change spark plug.
Fuel filter is dirty - Fuel filter needs changing.
Vapor separator needle valve is bend or wear - Change vapor separator needle valve.
Clogged fuel lines - Clean fuel lines.
Fuel tank air vent clogged or closed - Open or clean air vent.
Fuel feed pump failure - Fuel feed pump need to be replaced.
Choke cable is worn or not adjusted properly - Adjust correctly or change the cable.
Valve clearance is improper - Adjust valve clearance.
Improper valve timing - Adjust valve timing as required.
Low fuel pressure - Inspect fuel system for leaks or inspect low pressure fuel pump.
Fuel injector is damaged or dirty - Clean or install new injector.
Fuel regulator malfunction - Change fuel regulator.
ECM failure - Change electronic control modul.
| Engine starts and immediately shuts off |
Damaged spark plug - Install new spark plug.
Vapor separator needle valve is bend or wear - Replace needle valve.
Faulty ignition coil - Ignition coil should be replaced.
Fuel tank air vent closed or restricted - Open or service air vent.
Fuel pump defective - Install new fuel pump or rebuild it.
Faulty choke system - Check and repair choke system.
Valve clearance is improper - Adjust valve clearance.
Valve timing is wrong - Set the valve timing properly.
Loose or worn valve springs - Valve springs need to be changed.
Valves are stuck - Valves must be cleaned.
Low compression - Check and replace worn parts.
Dirty fuel filter - Install new filter.
Fuel injector is faulty or clogged - Clean or replace if necessary.
Engine oil level is insufficient - Need to add engine oil.
Damaged oil pump - Change oil pump as required.
Water intake is clogged - Wash or clean as required.
Thermostat is faulty - Change thermostat as required.
Water pump malfunction - Replace water pump.
Defective ignition system - Test ignition and replace failed parts.
Clogged or defective fuel pump - Clean or replace fuel pump.
Vapor separator needle valve is worn or defective - Change vapor separator needle valve.
Clogged fuel lines - Fuel lines must be clean.
Fuel tank air vent clogged or closed - Open or clean air vent.
Fuel filter is plugged - Fuel filter needs changing.
Intake manifold air leaks - Replace intake manifold gasket.
Water intake screen is dirty - Clean and wash as required.
Throttle valve and throttle link are defective or worn - Replace faulty components.
Clogged or worn fuel injector - Clean or replace if necessary.
Engine is under excessive load - Load reducing required.
Clogged fuel pump or fuel injector - Replace or clean as required.
Ignition timing is wrong - Set the ignition timing properly.
Damaged thermostat - Change thermostat.
Faulty water pump - Change water pump.
Incorrect propeller selection - Install correct propeller.
Damaged or bent propeller - Replace propeller.
Outboard motor is positioned too low or too high - Mount the motor as required.
Low engine oil level - Add oil to the engine crankcase.
Damaged oil pump - Change oil pump as required.
Water intake screen is dirty - Need to clean or wash.
Improper valve setting - Set the valves correctly.
| Engine knocking sound or abnormal noise |
Low octane fuel - Use correct fuel.
Engine overloaded - Reduce engine load.
Incorrectly set low idle speed - Adjustment required.
Fuel pump is defective or dirty - Inspect fuel pump and change as required.
Crankshaft or main bearings wear - Repair or replace defective parts.
Damaged piston rings or cylinder bore - Change faulty components.
Dirty fuel lines - Service fuel lines.
Fuel injector is defective - Install new fuel injector.
Clogged or defective fuel pump - Clean or install new fuel pump.
Ignition failure - Inspect ignition system and change faulty parts.
Cylinder head gasket is worn - Cylinder-head gasket replacement required.
Powerhead components are worn - Replace defective parts.
Stuck or burned valves - Clean or change valves.
Propeller selection improperly - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Incorrect outboard motor mounting height - Adjust the outboard motor height correctly.
Trim angle is incorrect - Adjust trim angle.
| Excessive fuel consumption |
Fuel injector is damaged or dirty - Clean or install new injector.
Loose or faulty spark plug - Re-tighten or replace spark plug.
Worn sleeve, rings, or piston - Replace defective components as required.
ECU is faulty - Install new ECU.
| Engine vibrates excessively |
Damaged or bent propeller - Have propeller repaired or replaced.
Propeller shaft damaged - Replace propeller shaft.
Weeds wraped around propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Steering pivot is loose or damaged Tighten or replace.
Low battery voltage - Low battery charging, charge as required.
Battery drains quickly - Service charging system or change battery.
Battery terminals are corroded or wires are disconnected - Check cables and service or change terminals.
Starter motor failure - Replace or repair starter.
| Trim motor runs but trim system does not move up or down |
Low oil level - Need to add the oil.
Pump assembly faulty - Test pump and change if necessary.
Leakage of manual release valve - Close the valve or change it.
Broken motor or pump driveshaft - Change worn component.
| Trim cannot be fully up or down |
Pump assembly is damaged - Replace pump.
Tilt ram piston ball is in wrong position - Service or repair.
Damaged tilt ram piston O-ring - Replace O-ring.
Lack of oil - Check and refill oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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