Section 7 - Troubleshooting
Page 134
90-899883154 JANUARY 2008
Possible Cause
Remedy
Seawater pickups or sea strainer obstructed.
Remove obstruction.
Faulty thermostat.
Replace.
Coolant level (if equipped) low in closed cooling
section.
Check for cause of low coolant level and repair. Fill
system with proper coolant solution.
Heat Exchanger or Fluid Cooler plugged with foreign
material
Clean Heat Exchanger, Engine Oil Cooler, and
Transmission Oil Cooler (if equipped).
Loss of pressure in closed cooling section.
Check for leaks. Clean, inspect and test pressure cap.
Faulty seawater pickup pump.
Repair.
Seawater discharge restricted or plugged.
Clean exhaust elbows.
Insufficient Engine Temperature
Possible Cause
Remedy
Faulty thermostat.
Replace.
Low Engine Oil Pressure
Possible Cause
Remedy
Insufficient oil in crankcase.
Check and add oil.
Excessive oil in crankcase (causing it to become
aerated).
Check and remove required amount of oil. Check for
cause of excessive oil (improper filling).
Diluted or improper viscosity oil.
Change oil and oil filter, using correct grade and
viscosity oil. Determine cause for dilution (excessive
idling).
Battery Will Not Recharge
Possible Cause
Remedy
Excessive current draw from battery.
Turn off non‑essential accessories.
Alternator drive belt loose or in poor condition.
Replace and/or adjust.
Unacceptable battery condition.
Test battery, replace if necessary.
Loose or dirty electrical connections or damaged
wiring.
Check all associated electrical connections and wires
(especially battery cables). Clean and tighten faulty
connections. Repair or replace damaged wiring.
Faulty alternator
Test alternator output, replace if necessary.
Joystick
Symptom
Remedy
The joystick does not control the boat.
One or both remote controls are not in neutral. Put
both remote controls in neutral.
One or both engines are not running. Start the engine
or engines.
Response to joystick input is erratic, or the joystick
operates independent of input.
Ensure there are no radios or other sources of
electronic or magnetic interference near the joystick.
The joystick does not function properly and a fault
code is set.
Check VesselView for Guardian fault codes that
indicate reduced engine power. If found, have the
system checked by your authorized Mercury
MerCruiser dealer.
The joystick does not work; No fault code is set and
cruise control engaged.
Disengage cruise control.