Cannondale ATV Owner's Manual - page 125
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ELECTRICAL
Troubleshooting
Many electrical problems are caused by faulty electrical
connectors or couplers. For example, wet terminals/pins,
dirty or corroded terminals/pins, or broken or bent cable
pins within multi-plug couplers.
Engine Management System (EMS)
All Cannondale ATV models use an advanced fuel
injection system. Engine operation is supported by an
Engine Control Unit (ECU) controlling both ignition and fuel
delivery. The complete system consists of three types of
electrical components: the ECU, sensors, and actuators.
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The engine control unit (ECU or ECM) precisely
calculates ignition timing and fuel delivery for all
engine speeds and loads (based on the currently
installed calibration file and its mapping). The ECU
is an extremely reliable component and should be
the last component checked in the event there is a
problem with the fuel injection system.
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The sensors of the system collect engine
operating information and transmit it to the ECU.
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Actuators are devices like the fuel injectors, fuel
pump, fuel pressure regulator, spark plug coil, and
relays.
Engine Control Units - MC500 & M1000
On all models, the vehicle ECU is located on the
electronics tray under the cowl.
Components have been removed for this photo.
1. MC500 ECU
2. Air pressure sensor hose (from airbox)
3. Relay
4. Relay
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