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  • #16
    Originally posted by jpwhit View Post
    DTC 51 is "Calibration Checksum Error", which often does indicate an internal ECM failure. Technically it means the ECM setup data memory is corrupted and that can be reloaded. But, those kinds of corruptions shouldn't really happen, so in practical terms it does usually mean something is internally wrong with the ECM. Maybe when you say MEFIBurn tried to fix the original ECM, they simply reloaded the configuration to see if that would take care of the issue.

    Was the replacement ECM brand new or was it a used or repaired ECM? If both ECM's failed with DTC 51, then that sounds like either incredibly bad luck or the replacement ECM wasn't new and is also a lemon.
    Hi JP...the original ECM replacement came from Indmar. This is the one MEFI Burn recalibrated twice. Then the new one from Indmar as well through Inboardonline. Here is a thought I am checking into. My boat was purchased new without Perfect Pass. Then the local dealer installed Perfect Pass. I read a tech bulletin from Perfect Pass or MC that the ECM should be "flashed" for Perfect Pass even though there is no direct wiring between the two. Thoughts on this? Neither ECM was "flashed" for Perfect Pass. PP was off though on the second failure.

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    • #17
      So many threads right now on boat issues it's hard not to mix them up. I re-read your whole thread so some of what I said in my last post doesn't apply.

      Let me play this back and see if I have it right. The boat has it's 3rd ECM and that ECM is currently believed to be bad.

      Details of first ECM failure in 2017 is not known.

      The second ECM had problems and was re-calibrated by MEFIBurn several time and "DTC 51 Calibration Checksum Error" kept occurring. Recommendation was to get a new ECM because that one was bad. Assuming this is correct, then I agree with the recommendation to replace it.

      Third ECM is also failing with "DTC 51 Calibration Checksum Error"? Or the third one hasn't been tested? If it's the latter, then my advice would get someone to read the codes from this third ECM. Any dealer should be able to do that. Often when an ECM is fried, it's totally dead and you can't communicate with it to read the codes. If that the case with this third ECM, then that's a totally different failure.

      I don't see how PP being installed plays into the issue at all. The only version of PP that communicates with the ECM is the DBW version. But that version of PP hasn't been made since the legal settlement with eControls (Zero Off). And since your boat is a 2003, it's well before DBW.
      -----------------------------------
      Mastercraft ProStar 2019 5.7L - Current
      Mastercraft X25 2014 6.2L - Current
      Nautique 200 OB 2012 5.7L - Current

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      • #18
        Hi JP, that is correct...3rd ECM is supposedly too fried to read. It's back at Indmar for their input. The boat is headed to a wiring harness specialist to see what can be detected from an electrical standpoint if any...thanks for weighing.

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        • #19
          Originally posted by Shredh20 View Post
          Hi JP, that is correct...3rd ECM is supposedly too fried to read. It's back at Indmar for their input. The boat is headed to a wiring harness specialist to see what can be detected from an electrical standpoint if any...thanks for weighing.
          Best on the solution. Keep this account updated please.

          .
          93 190
          (safe click)

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          • #20
            Hello everyone...a happy ending to this one. I took my boat to Technical Services in Syracuse, IN. They specialize in anything electrical (https://www.technicalservicesin.com/). I had two bad relay switches and a potentially damaged wire in the harness. All were replaced and the boat is back on the water. Harness repair/replacement is what they do. Check out their customer list and you will see who they work with. The staff is awesome and they were truly engaged in my issue and resolving it. This is not a boat dealer/service center. These guys are engineers that resolve problems!

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            • #21
              Originally posted by DaveyD View Post
              Hi Shredh20, have you had any success fixing the boat? Ive got a similar ecu frying issue with my 2005 x45 and we are stumped.
              Hi Davey D...see my resolution to this. You may want to replace your relay switches around the ECM. I have three of them. One or two had a wider than normal gap for proper fitting on the connectors, thus causing contact issues. Hopefully you get some resolution!

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              • #22
                Originally posted by Shredh20 View Post
                Hello everyone...a happy ending to this one. I took my boat to Technical Services in Syracuse, IN. They specialize in anything electrical (https://www.technicalservicesin.com/). I had two bad relay switches and a potentially damaged wire in the harness. All were replaced and the boat is back on the water. Harness repair/replacement is what they do. Check out their customer list and you will see who they work with. The staff is awesome and they were truly engaged in my issue and resolving it. This is not a boat dealer/service center. These guys are engineers that resolve problems!
                Best in the business. Good call on your part.

                They also pioneered the Chevrolet LT-1 engine for the 1993 Mastercraft engine option.

                .
                93 190
                (safe click)

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                • #23
                  Originally posted by Shredh20 View Post
                  Hello everyone...a happy ending to this one. I took my boat to Technical Services in Syracuse, IN. They specialize in anything electrical (https://www.technicalservicesin.com/). I had two bad relay switches and a potentially damaged wire in the harness. All were replaced and the boat is back on the water. Harness repair/replacement is what they do. Check out their customer list and you will see who they work with. The staff is awesome and they were truly engaged in my issue and resolving it. This is not a boat dealer/service center. These guys are engineers that resolve problems!
                  Glad to hear you got it figured out. I went through a very similar situation and it took a couple months and several thousand dollars to sort it out. Local shop was stumped and I was way over my skis. Through a ton of parts at it and it ended up ruining an expensive lake rental vacation as well as a good chunk of our season a couple years back. Mine didn't end up being a relay, harness or faulty wire issue, but rather a slightly broken coil lug on top of the distributor cap. This was caused by a sagging rear center hatch; people walking on it, kids crawling over it to get to the swim step, etc. Just enough to slightly crack the plastic around the lug and cause an arc. The starboard backing has just decayed/degraded to the point there's less rigidity. Symptoms were similar too including misfires, intermittent check engine light, full stops, etc., until at one point it just wouldn't turn over. Same error code 51 on the ECM as well. I actually ended up figuring it out thanks to this forum and a member who owns the same year, same model boat that went through the exact same thing. I sent him an email and he responded a few days later with the root cause. His boat sat idle for over a year as he worked to try to figure it out.

                  FWIW, boat has ran perfectly ever since and she goes in this September for a complete vinyl resto and reframe of the center hatch.

                  Glad you got it sorted and hope you have a trouble-free and safe rest of your season.
                  ¡Viva 205V!
                  2003 X2 MCX

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                  • #24
                    Originally posted by brucemac View Post
                    Glad to hear you got it figured out. I went through a very similar situation and it took a couple months and several thousand dollars to sort it out. Local shop was stumped and I was way over my skis. Through a ton of parts at it and it ended up ruining an expensive lake rental vacation as well as a good chunk of our season a couple years back. Mine didn't end up being a relay, harness or faulty wire issue, but rather a slightly broken coil lug on top of the distributor cap. This was caused by a sagging rear center hatch; people walking on it, kids crawling over it to get to the swim step, etc. Just enough to slightly crack the plastic around the lug and cause an arc. The starboard backing has just decayed/degraded to the point there's less rigidity. Symptoms were similar too including misfires, intermittent check engine light, full stops, etc., until at one point it just wouldn't turn over. Same error code 51 on the ECM as well. I actually ended up figuring it out thanks to this forum and a member who owns the same year, same model boat that went through the exact same thing. I sent him an email and he responded a few days later with the root cause. His boat sat idle for over a year as he worked to try to figure it out.

                    FWIW, boat has ran perfectly ever since and she goes in this September for a complete vinyl resto and reframe of the center hatch.

                    Glad you got it sorted and hope you have a trouble-free and safe rest of your season.
                    Noted. Thank you for sharing.
                    93 190
                    (safe click)

                    Comment


                    • #25
                      Hey great to hear you got your boat going, I just had success with mine as well. Wanted to let you know we found. We had tested all the harnesses independently and they were fine but we noticed a bit of black on the plug that goes from engine harness to rest of boat and so we soldiered each wire direct and eliminated the plug. Thinking it was loose and was shorting out there.
                      Had the boat out yesterday and I think this has fixed my issue.

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