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■ Advanced Electronics
32-Bit ECM (Engine Control Module)
The ECM (Engine Control Module) allows much more
accurate control over the motor’s operation, particularly
the engine’s ignition and fuel delivery systems. The DF150
and DF175 rely on a powerful 32-bit computer in the ECM
to monitor and process crucial data, in real time, from a
series of sensors placed in critical areas on the engine. This
comprehensive network of sensors includes the Manifold
Absolute Pressure Sensor, Crankshaft Position Sensor,
Intake Air Temperature Sensor, Shift Position Sensor,
Throttle Position Sensor, Cylinder Wall Temperature
Sensor, Camshaft Position Sensor, and Exhaust Jacket
Temperature Sensor. Processing this data in real time, the
computer controls the engine’s ignition system and pro-
vides an ideal fuel supply under all operating conditions.
Multi-Point Sequential Electronic Fuel
injection
As Suzuki was the first outboard motor manufacturer
to incorporate multi-point sequential fuel injection in a
four-stroke outboard, it is only natural that the DF150
and DF175 would utilize the same. The system injects
the optimum amount of fuel at high pressure into each
cylinder according to commands from the ECM’s 32-bit
computer. Along with saving fuel, the system enables the
DF150 and DF175 to meet the world’s strictest emissions
regulations—CARB 2008—and pass the EPA’s 2006
regulations. Other benefits include quick starts, crisp
acceleration, smooth performance, and maximum effi-
ciency.
Flywheel
Magneto
High
Pressure
Fuel Filter
Fuel Cooler
Pressure Regulator
Evaporation Hose
Vapor
Separator
High Pressure
Fuel Pump
Float
Squeeze Pump
Low Pressure Fuel Filter
Low Pressure Fuel Pump
Battery
Shift Position Sensor
Fuel Tank
OFF
IG
ST
ECM
Starter Relay
Main Relay
Ignition
Switch
Fuse
Neutral Switch
Manifold Absolute Pressure Sensor
(MAP Sensor)
Intake Manifold
Injector
Throttle Body
Silencer
Idle Air Control
Valve (IAC Valve)
Vacuum Switching
Valve (VSV)
Pilot Air
Adjust Screw
Throttle Position Sensor
Intake Air Temp Sensor
(IAT Sensor)
Cylinder Head
Ignition Coil
Cylinder Block
Oxygen Sensor (Service tool only)
Cylinder Wall Temp Sensor
Spark Plug
Exhaust Jacket
Temp Sensor
Camshaft Position
Sensor (CMP Sensor)
Oil Control Valve (OCV)
Crankshaft Position
Sensor (CKP Sensor)
Multi Point Sequential Electronic Fuel Injection