Warning Buzzer And Lamp (Led), And Control Of Engine Revolution Speed; Locations Of Warning Buzzer And Lamp (Led); Warning Notification, Abnormality And Action To Be Taken - TOHATSU MFS25 Service Manual

(6) Warning Buzzer and Lamp (LED), and Control of Engine Revolution Speed

Warning System
When an abnormality occurs on the engine, warning buzzer sounds and warning lamp (LED) is lit or blinks.
In such case, engine speed is controlled but engine is not stopped.

1) Locations of warning buzzer and lamp (LED)

• Warning buzzer : In the remote control box for remote control model, or in the top cowl for tiller handle model.
• Warning lamp (LED) : On the front of bottom cowl.
Remarks : Lamp of tachometer with warning lamp (optional item) operates in synchronization with warning lamp of
outboard motor.

2) Warning notification, abnormality and action to be taken

Buzzer
Sounds 2 seconds
Continuous sound
Continuous sound (*2)
Continuous sound
Intermittent sound (*2)
Remarks *1 : When oil pressure switch is on.
*2 : Stop engine to cancel warning notification.
Note : When engine low speed ESG goes on, the speed is reduced to 2,800 r/min or lower.
Therefore, continuous operation in this state should be avoided.
When engine high speed ESG goes on, the speed is set to 6,300 r/min.
ECU stops firing of spark plugs to control the speed to 6300 r/min.
Continuous operation in this state should be avoided.
Action to be taken
25/30 2006
Warning System
Engine Low
Lamp (LED)
Speed ESG
Lit 5 seconds.
Lit ON
Lit (*2) ON(*2)
Lit
Blinking (*2) ON(*2)
(1) : Run immediately to a safe location, set throttle to slow speed, shift into neutral (N),
check that cooling water is discharged to check port, and then, stop engine.
Remove dirt, plastic sheet or other matters that clogs water intake port, if any.
If no water is discharged from the port, check each section of the outboard motor.
(2) : Run immediately to a safe location, set throttle to slow speed, shift into neutral (N), and stop engine.
Check engine oil level, and add oil if necessary.
If engine oil level is within specified range, check other sections.
(3) : Run immediately to a safe location, set throttle to slow speed, shift into neutral (N), and stop engine.
Check propeller blades for bend or damages.
If this abnormality continues even after propeller is replaced with new one, check other sections.
(4) : Go to the nearest port immediately and check each section after stopping engine.
Engine High
Abnormality
Speed ESG
This is a check for operation of warning
system at starting, meaning normal.
Engine cooling water temperature is abnormally high.
Engine oil pressure is reduced (*1).
ON Engine revolution speed is over the maximum permissible limit.
Water temperature sensor or MAP (Manifold Pressure)
sensor is defective or the sensor circuit is disconnected.
Action to
be taken
4
(1)
(2)
(3)
(4)
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