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115 Optimax water pres alarm

R

Rick4444

New member
Hi all,
I have twin 115 opitimax 2011 models, 200hrs, smart craft gauges and have owned from new.
Right hand engine is throwing low water pressure alarm when key turned on. I have swapped pressure senders and fault stays with the engine. Sender works fine on LH engine.
Water pressure is fine when I ran it with sender removed.
Wiring from sender to ecm tests fine.
Would anyone have any ideas or experienced this problem before.
Thanks in advance if you can help me get back on the water 🚤
 
Thanks for reading my post mate.
It is when ignition turned on before starting, gauges power up and says engine fault low water pressure when you scroll to the water pressure read out it’s 3 horizontal lines. Stays the same when started and running.
 
I don't have you exact manual, so I'm going off similar ones

The sensor has 3 connection, ground, 5V and sensor. All connects go back to ECM. The ground and 5V connection are shared with other sensors. Measure to see if it's getting exactly 5V and the measurement should come from the connector

My guess is there is a bad or broken connection between sensor to ECM
 
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