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Old 10-09-2021, 07:53   #1
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Yanmar 4BY3 Engine Alarm

I have an alarm going off on one engine and it only tells me Check Engine
everything looks fine, temp, oil pressure, fluids are all good

I have only come across one thing about possible exhaust backpressure

Any ideas what I should look at?
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Old 16-09-2021, 08:42   #2
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Re: Yanmar 4BY3 Engine Alarm

Can you find the tranducer that is sending the signal? your alarm is getting voltage from somewhere, so trace the wire. It's possible that you have a bad sender.
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Old 17-09-2021, 03:42   #3
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Re: Yanmar 4BY3 Engine Alarm

Here’s the fault code list from the manualClick image for larger version

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Your best chance is to start swapping sensors but alarm events are not necessarily due to a faulty sensor ie boost pressure to fuel quantity and other mismatches of operating parameters.
Best of luck.
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Old 24-09-2021, 10:18   #4
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Re: Yanmar 4BY3 Engine Alarm

I changed fuel filters and the alarm stopped
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Old 24-09-2021, 14:30   #5
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Re: Yanmar 4BY3 Engine Alarm

Good work, thanks for the info Robd527.
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