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Old 31 May 2016, 14:47   #1
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Mercury optimax 225hp sensor fault

Hi,

I have the above engine with three faults on the smartcraft gauges. I'm getting there re fault finding but could do with some help

First one is fuel fault. There is no sender from the tank, sometimes it reads 93litres in the tank, other times it faults. Can I bypass it altogether?

Second one is trim fault. I've located the trim sensor and have yet to check the wiring. If the sensor is stuffed any advice where I can buy one? Engine is a 2001 with a warranty replaced 2003 power head

Third one and most annoying is a water temp alarm. After a lot of reading I've discovered that this is an outside water sensor to let the ecu know when the water is freezing etc so it adjust oil mix etc. I think it's this one that sets the alarm off 4 beeps every 2 mins arghhhh

I don't know where this is on the engine I assume cylinder head? If anyone can let me know where to look that would be fab and again if it's not wiring where to get one?

Motor has been stored and is now back in use which is where the faults are coming from. Runs and pumps water fine so I'm fairly sure this is just annoying stuff

Thanks

Neil


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Old 31 May 2016, 15:44   #2
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Neil have you downloaded the smartcraft & optimax 225 operations manual ? They are there if you google search them for free. I think the paddle (speed) sensor is also temperature sensor
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Old 31 May 2016, 15:57   #3
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I have but can't find much about this tbh or where it is. If I can find it I can test it 👍
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Old 31 May 2016, 16:03   #4
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Page 34 no 16 shows temp sensor


http://www.hedges-uk.com/boat/Merc/o...nd%20Above.pdf
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Old 31 May 2016, 16:16   #5
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Temperature Sensor
Three temperature sensors are used to provide cylin- der head temperature information to the ECM. A sen- sor is mounted in each cylinder head and one in the air compressor cylinder head. The ECM uses this in- formation to increase injector pulse width for cold starts and to retard timing in the event of an over-heat condition.
An ohms test of the temperature sensor would be as follows:
Insert digital or analog ohmmeter test leads into both TAN/BLACK sensor leads. With engine at tempera- ture (F_) indicated, ohm readings should be as indi- cated 10%.
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Old 31 May 2016, 16:56   #6
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That's super helpful thank you very much. I'd found the operation manual and the smartcraft manual not the service manual. Top man 👍
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Old 20 June 2016, 13:43   #7
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I thought I'd update this for anyone that searches for info in the future

Some of what I now know is blindingly obvious in hindsight but there you go. So in no order

Master reset won't fix or remove faults. They will clear when the problem they are signalling is cleared. If the guages say there is still a problem there is

Access to smartcraft guages to calibrate is different in different models. Holding minus and plus down works on many. On mine it's hold down minus and plus and then turn the ignition on then press mode to get into calibration. It took some searching to learn that
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Old 20 June 2016, 13:45   #8
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There is a water temp sensor that is not the engine temp water sensor. This sensor is checking the outside sea temperature to aid cold water standing. It can be turned off in calibration and the engine will be fine
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Old 20 June 2016, 13:50   #9
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If you see an oil warning saying 100% left either your aux tank is empty or blocked basically the engine is taking oil from the small tank on the block and it's telling you that

If that tank starts to empty it can airlock when you put oil in the aux tank. To clear that fill the aux tank. Take the cap off the oil tank on the engine and run the engine. Be careful. The tank will start to fill and oil will flow out. When it's full put the cap back on. This will bleed the system and the alarm will clear
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Old 20 June 2016, 13:52   #10
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If you get a fuel tank warning and its not empty it either needs calibrating or he sender is broke. You can set the guages to no fuel tank present in calibration. This will remove the alarm or you can obviously calibrate
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