HELP PLEASE Suzuki DF70 four stroke efi problem
 

Hi all
I have a Suzuki DF70 in or repair, the warning horn is blipping when the
engine is running.
There are no fault codes when i run diagnostic softwere.
When i introduce a fault the check engine light operates on tacho and buzzer
bleeps.
I have another engine that is ok, i have changed all the sensors and ecm but
still it blipps at me.
I have canceled service reminder by pulling out kill switch 3 times after
turning ignition key on. I have also discovered that if i push the key in
when engine running it stops blipping. when i turn off and then restart it
reverts back to the blipping
( blipping is a 1 second beep followed by approx 10 seconds of silence}
(beep is 3 second beep followed by 7 seconds of silence)

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