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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    I connected Diacom without the motor running and it read the 5V. The Reference 2 was reading at 4.16. I started with the TCP sensor, unplugged that and it jumped up to 4.98 immediately
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    I was able to get a hold of the wiring diagram, and traced back the 5V Reference 2 to the "TCP Sensor" - what is that? Did I read this correct? Link to wiring diagram in case the attachment doesn't load https://drive.google.com/file/d/1FnUwNEVrcSGe832hpX9Hpn3m3wMYUGDR/view?usp=sharing
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Electrical is definitely not my strongest area, but I think I have identified all of the sensors and their locations - how do I go about measuring a 5V circuit as @alldodge mentioned? I don't think the Diacom was reading the volts for each sensor. Am I hooking up the alligator clip leads to the...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Is there a full list of all the sensors and their locations anywhere? What is the best way to measure the 5V circuit as I undo each sensor?
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    I was able to find that one on the bottom right side of the block, no wire interference but may be worth replacing as a just in case? My main question around the 5V issue we are talking about is that according to the Diacom, it was low the entire time, what would make the alarm trigger past...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    I followed the wire and it goes to the back of the engine, so not near or tied in with the spark plug wires - there was one sensor right at the rear/top of the engine that had wires which were pretty squished by a larger hose, which sensor is this?
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    I ask these questions as a total newb, but is it possible that the VR#2 issue that you called out is feeding the Knock Sensor? You mentioned that we can't really tell which sensors use which VR, but is that one possibility? The only reason I keep bringing up the Knock Sensor is the callout in...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    I also see the Soft Warning Output goes On/Off at the same time the alarm so it does recognize it when it happens, but it doesn't seem any of the other sections drop/raise dramatically?
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Is the 5V sensor something different than the Knock Sensor which had low voltage too? If different, what would need to be fixed, or what sensor to look for? The trim sender is connected and working, but the gauge does not work. Could that be related? Did anything else stand out?
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    I just took it out and recorded the live data, the alarm came on right around the 7:40 mark (I heard it and looked down and it said 7:44 so give or take a few seconds), I lowered speed to below 3000 RPM, it went away, pushed it again over 3000 RPM and came back on. Let me know if there's any...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Update for all - finally got the right adaptor (I can confirm 94029 does work) and was able to run the Diacom software without even needing to take the boat out for a ride. It appears the previous trouble codes are listed (image below). I wonder if this is just a bad Knock Sensor or potentially...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    I spoke to a rep named Mark and he was super helpful. He said that the circular connector that I originally bought for is for connecting 2 engines. The 94029 is the correct adaptor for my setup and they are able to just exchange them (plus some money for price difference) as opposed to having to...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Interestingly enough the connector that I bought an adaptor for was not the right one. To the untrained eye, it looked identical, but it's only identical looking straight at it, which does not actually line up when trying to connect them (the one portion at 3 o clock of the circle and other at 8...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Do you have any tips or know of any good online guides or videos? I work in the tech field so am hoping the learning curve is a bit less, but we will see once I dive in next week
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Thanks @Donald0039 that's good to know, I was able to get a hold of a Windows laptop and the scanner is due to be delivered Monday. Will update this thread with my findings assuming all connects and logs well
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    :ROFLMAO: I am 100% a victim of the parts cannon, but the manifolds and risers were due and I keep my boat in saltwater so I don't feel "as" bad about that expense, or at least that's what I keep telling myself... Thanks for the follow up and confirmation @tpenfield I am going to go with this...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Now that I look at it, I think I may have a 2006/2007 engine which would need the 94024 adapter - attached is my connection which makes that adapter and the 90 pin ECM To confirm, this would be the best option based on that correct? https://www.rinda.com/rindashop/shop/diacom/diacom-94124-kit
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    okay so the Diacom is the only option for my use case - I can borrow a computer to make it work worst case scenario and not have to worry about building a reader. The Diacom will record the data once the alarm goes while driving with it plugged in? My ECM is the 90 pin module from the 3 options...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Is there an advantage over the Diacom vs Techmate? Diacom seems to be PC based while I use a Mac without a disk reader, so would the Techmate options be valid as well?
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