8.0 TROUBLESHOOTING 85
CXO300 OWNER’S MANUAL
Problem Possible cause Possible solution
Powerhead operates
erratically
Water separator full Drain the water separator
Poor quality or degraded fuel Drain fuel tank then fill with fresh fuel to specification
Poor electrical connections
Check outboard(s) umbilical is intact, inspect outboard(s)
and vessel wiring
Low battery voltage
Check voltage and replace if necessary, check battery
cables and terminals
Low or degraded
performance
Poorly matched propeller
Contact your Cox Powertrain official dealer for propeller
matching advice
Damaged propeller Inspect for blade wear and replace the propeller if necessary
Biofouling
Inspect transmission, propeller and hull for biological
build-up and clean as necessary
Powerhead overheating
Inspect the water inlets for blockages, check the mounting height
of the outboard(s) keeps the inlets underwater at speed
Air inlet blockage Inspect air filters, inspect upper cowling air passages
Low battery voltage
Check voltage and replace if necessary, check battery
cables and terminals
Fuel system low pressure or
flow
Inspect fuel lines and clamps, check operation of lift pump,
inspect fuel filters
Poor quality or degraded fuel Drain fuel tank then fill with fresh fuel to specification
Outboard vibrates
excessively in neutral
Air inlet blockage Inspect air filters, inspect upper cowling air passages
Fuel system low pressure or
flow
Inspect fuel lines and clamps, check operation of lift pump,
inspect fuel filters
Fuel tank nearing empty Fill tank with fresh fuel to specification
Fuel tank vent partially
obstructed
Check fuel tank vent for any obstructions and clear
Water separator full Drain the water separator
Outboard vibrates
excessively in forward
or reverse
Air inlet blockage Inspect air filters, inspect upper cowling air passages
Damaged propeller
Inspect propeller for damage or tangled foreign material,
replace the propeller if necessary
Loose mounting bolts
Inspect the mounting bolts at the transom and tighten if
necessary
Alarm is displayed
Electronic control system has
detected an abnormal condition
Consult the table of warning alarms in this manual
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