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Author Topic:   Honda Alarm Buzzer Interpretation
grolsch posted 06-03-2008 03:58 PM ET (US)   Profile for grolsch   Send Email to grolsch  
Hello – I have a Honda 4 stroke 35 hp out board. The indicator buzzer comes on with a constant intermittent signal when the throttle is past slow. The oil and over heating lights are fine. Oil is full, was serviced in April and the water pump is working well.

The motor does not decrease in speed at all as the manual said it would with a problem. Changing the tilt of the engine does not matter either.

Any ideas please?


jimh posted 06-04-2008 08:28 AM ET (US)     Profile for jimh  Send Email to jimh     
It is common that an aural alarm in an outboard motor will be used to alert the operator to several alarm conditions. Check the owner's manual to see if Honda has explained precisely what conditions will trigger an aural alarm. In some motors the cadence of the aural alarm is modified in order to provide a way for the operator to interpret the meaning of the alarm signal. The different alarm signal cadences are usually explained in the owner's manual. On some outboard motor there are visual indicators which provide additional information to allow the operator to diagnose the alarm condition after having been alerted to it by the aural alarm. The owner's manual will explain how to interpret these additional visual indicators, if they are used.

If your Honda engine uses an aural alarm to be an alert to several conditions, and if there is no variation in the alarm cadence, and if there are not other visual indicators to differentiate between the several possible causes, I don't know of any way to determine the specific meaning of the alarm. You will have to investigate all the possible sources which might trigger the alarm to discover if any of them are the likely source. Your owner's manual should provide some advice. The proper action to take in response to an alarm should be detailed in the owner's manual.

jimh posted 06-04-2008 08:38 AM ET (US)     Profile for jimh  Send Email to jimh     
In any alarm circuit, when the alarm sounds there are three general possibilities:

--there is a fault condition and the alarm is properly signaling the fault;

--there is no fault condition, but a sensor in the alarm system has malfunctioned and provided a fault signal, creating a false alarm;

--there is no fault condition, no sensors are indicating a fault, but there is a malfunction in the alarm system itself, creating a false alarm.

In diagnosis of the cause of the alarm, it is best to carefully check for an actual fault condition before considering the alarm to be a false alarm.

If a false alarm is suspected, it is usually possible to perform a test of the sensors without having to operate the engine. For example, you can test a temperature sensor by removing it from the engine and checking its electrical response to varying temperature. Or, you can check the sensor in a static test, with the engine not operating.

If a problem in the alarm system itself is suspected, it may be possible to disconnect the sensors and see it the alarm persists without input from the sensors. This is usually a good indicator that the problem is in the alarm system, not in the sensors. A common alarm system failure is the warning device itself.

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