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Mercruiser issues with alarm and guardian mode

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  • #16
    Have heard some of those water pressure sensors have a grounding issue, and some run a dedicated ground to it. If you don't have an overheat issue, doubt you'll find a blockage.

    Definitely a known Smartcraft problem.
    1999 Powerquest 260 legend
    502 mpi
    B1

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    • #17
      Originally posted by scoflaw View Post
      Have heard some of those water pressure sensors have a grounding issue, and some run a dedicated ground to it. If you don't have an overheat issue, doubt you'll find a blockage.

      Definitely a known Smartcraft problem.
      so you say run a ground wire to the brass part of the sensor?

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      • #18
        Worth a shot. Been a documented issue.

        ​BT probably knows how to override the sensor
        1999 Powerquest 260 legend
        502 mpi
        B1

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        • #19
          BT?

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          • #20
            So far no one has figured out how to bypass the sensor. As for the ground issue, just make sure to use no sealant on the threads. Also since the sensor is mounted on the power steering cooler, make sure the bolts holding it to the engine are tight and the cooler does not move any.

            Low pressure can also be from anything clogging up the channels, this is from the drive, thru the pump and out. My first thought is the seawater pump. Even though the impeller has been changed those pumps have issues with sucking air if the wear plates are not in good shape. You could get a piece of 1 1/4 clear hose and put it inline to see if anything is showing up
            94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
            95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
            07 Seadoo GTX
            Merc Adults Only VP Adults Only
            G-Dad always said "First Liar doesn't stand a chance"

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            • #21
              Originally posted by AllDodge View Post
              So far no one has figured out how to bypass the sensor. As for the ground issue, just make sure to use no sealant on the threads. Also since the sensor is mounted on the power steering cooler, make sure the bolts holding it to the engine are tight and the cooler does not move any.

              Low pressure can also be from anything clogging up the channels, this is from the drive, thru the pump and out. My first thought is the seawater pump. Even though the impeller has been changed those pumps have issues with sucking air if the wear plates are not in good shape. You could get a piece of 1 1/4 clear hose and put it inline to see if anything is showing up

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              • #22
                Is clear plastic hose safe to run?
                Yes, but I wouldn't leave it, but some have and have had no issues. Most just add a short piece at different hoses
                94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                07 Seadoo GTX
                Merc Adults Only VP Adults Only
                G-Dad always said "First Liar doesn't stand a chance"

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                • #23
                  Basically the 3 wire sensor is this. B= ecm, C=5 volts DC, D=wiper all the wiper does is change the voltage reading in respect to ground
                  still getting the air pressure feed setup to read the values of the resistor
                  NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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                  • #24



                    The Warning codes and descriptions

                    NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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                    • #25
                      Did you ever solve the problem? Having basically the same issue and can’t figure it out.

                      8.1 horizon
                      When it gets to around 1700 rpm it’s throws an alarm. It doesn’t have a code. Only
                      fault we can see is high water pressure (79-106psi) with he computer hooked up it never reads over 13psi but after the alarms set and you check the fault page it shows high water pressure.

                      Has new maifolds. New seawater pump. New sensor. And we switched computers with other engine.

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                      • #26
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                        Originally posted by Gilstrapja View Post
                        Did you ever solve the problem? Having basically the same issue and can’t figure it out.

                        8.1 horizon
                        When it gets to around 1700 rpm it’s throws an alarm. It doesn’t have a code. Only
                        fault we can see is high water pressure (79-106psi) with he computer hooked up it never reads over 13psi but after the alarms set and you check the fault page it shows high water pressure.

                        Has new maifolds. New seawater pump. New sensor. And we switched computers with other engine.
                        Hello Gilstrapja. We try to not post in threads older than 90 days. This thread is more than a year old. If you have a problem, please start a new thread, and link back to this one if you need to.

                        Thank you
                        Chris.
                        iboats Mod team.
                        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                        The world takes on a whole new perspective when viewed from 100’ below.
                        1972 Bertram ‘Bahia Mar’ 20
                        2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                        (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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