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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    @alldodge let me outline the sequence of events, my initial post was just a data dump so allow me to clean it up. Apologies in advance if there is unnecessary info, but rather give too much than too little: 1. Friday 8/18 I was beached at a local spot where it is common to pull the front end...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I was just looking through the diagnostics manuals from Diacom, and found the below section which aligns with what I am experiencing - How do I know whether the issue sits with the Crankshaft Sensor or Cam Sensor, when both were flagged in the codes?
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    Update: I was able to finally find the location of the crankshaft position sensor, it's on the back of the engine, facing vertically up, it is very hard to see and find but a pic of the location is attached - I unplugged the sensor and replugged it in, engine started right up but pretty rough -...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    Would you be able to mark where on the diagram below? The one that seems to be location you described but port side is Cam Sensor right?
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    You are right, it can be cleared without the engine running, but those codes being present aren't preventing the engine from starting. I want to focus the troubleshooting there first because I don't know if my 2 issues are related, or independent of one another (1 being engine dying while...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I also read that the CKP will prevent the engine from starting, is it possible the sensor is having issues causing the inconsistent starts? Is this sensor right above the raw water pump? I can't get an accurate location from anything online or the manuals I have access to
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    Attached are the 2 codes that were flagged. I have not tried clearing them yet since I can't get the engine to start a second time I didn't want to take a chance of taking it out for a trial until I can get clean consistent starts. I wasn't sure these were preventing the engine from starting...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I have a 8.1 GXI-J Volvo Penta and took the boat out on Saturday for a ride where after about a minute on plane the boat died on me, alarms went off, and would not turn back on. After waiting a few minutes, the boat did start back up and I was able to get it back home to my dock. The boat starts...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    That's a great point, having the Diacom software myself was the ultimate factor for this. It is worth calling out that I called a few local shops before coming to this forum who all said that the soft alarms were "not" stored and the only way to capture them would be to run the software while...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    @muc @alldodge @tpenfield I owe you all a huge thanks for the support, troubleshooting, and overall insights on this issue. I had the boat out all day yesterday with no alarms or any issues thankfully. I appreciate the explanations of everything so that I can better understand the mechanics and...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Update for @muc @tpenfield @alldodge I replaced the Knock Sensor #2 and it was in rough shape, just took the boat out and for 4 minutes straight ran it between 3000-4000 RPM with no alarms. Attaching the Diacom log for it. Do you see improvements from replacing the Knock Sensor #2? I want to...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Diacom does have the "EGC Fuel Injection System Operation and Diagnosis" available, I will definitely go through this to familiarize myself overall just to have a better grasp on things. For reference, attached screenshot shows the manuals available via Diacom I wasn't able to find any serial...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    I reached out to Rinda about updated versions and their response was below: Unfortunately, we don't have any access to any additional documentation or manuals These manuals are provided by the engine manufacturers and we are limited to what they choose to provide to us Some manufacturers...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    But hopefully this will serve as answers (once we get to them) for future forum members experiencing the same issue! 🤞
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    @muc the plate that has the serial number is pretty destroyed and faded and I am having real trouble determining the last 2 numbers. What I can say with pretty good confidence is that the first numbers are 40122305. Do you know if like a car certain numbers represent certain things that we can...
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Do you believe there is any validity in the TPC/TPS causing the soft alarm? I won't even bother opening the new TPS assembly if not
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Are you able to share a screenshot of this page in the meantime? Raining here for another hour or so then going to plan to go out
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    Once I can get the serial number (it's raining here today, so hopefully tomorrow morning) I can download the manual and see. From previous conversations, it is an 8.1 GXI-J, but I do not have the serial number yet to 100% confirm that
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    The version Diacom provides is VPA 7743614 English 07-2005
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    2008 Chaparral 275 SSI 8.1 Volvo Penta GXI-J Soft Alarm Issues

    The only troubleshooting specific to the KS has been the Diacom logs that I shared in post 30 and 75 where the Code was flagging it and the voltage drops you called out. Also, the unplugging of the sensor to check the 5V ref #2 data. Besides that, no other troubleshooting steps have been done...
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