More on the code 25 water pressure switch

Discussion in 'Sport Cruisers' started by Happy Angel II, Dec 3, 2022.

  1. Happy Angel II

    Happy Angel II Member

    35
    Sep 11, 2016
    Palm Harbor, Florida and Gray, ME
    260 2015 Sundancer DA
    180 2001 SeaRay BR
    350 Mag w/BR3
    3.0 Alfa1
    Greetings,
    I checked with the technician that does all of my maintenance, and he gave me the Mercruiser water pressure ranges for my engine.(5.7 350 300HP).
    Water pressure ranges:
    @ Idle 1-3 lbs
    @ Mid Range 5 lbs
    @ Full Throttle 18-25 lbs
    For the most part, I fit the bill...any thoughts??
    Cheers,
    Larry
     
  2. PlayDate

    PlayDate Well-Known Member

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    Welcome to CSR!

    Those PSI numbers look good to me. Is there a problem you are chasing?
     
  3. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx 502 mag
    2005 Baja 242 islander 496
    502 mpi Bravo 1
    496 mag B1
    That sensor is a $100 plus dollar pc. of crap, prone to failure. If it's not alarming and reducing power your good to go. Don't get concerned with the numbers, if it's not overheating
     
    PlayDate likes this.
  4. Happy Angel II

    Happy Angel II Member

    35
    Sep 11, 2016
    Palm Harbor, Florida and Gray, ME
    260 2015 Sundancer DA
    180 2001 SeaRay BR
    350 Mag w/BR3
    3.0 Alfa1
    Hi John,
    Yes those numbers looked good to me as well.
    The problem arises when the RPM reaches around 3200, and a code 25 appears on the digital speedo. The Raw water pump and the pressure sensor have been replaced with factory parts.
    What ye say John??
    Cheers,
    Larry
     
  5. Happy Angel II

    Happy Angel II Member

    35
    Sep 11, 2016
    Palm Harbor, Florida and Gray, ME
    260 2015 Sundancer DA
    180 2001 SeaRay BR
    350 Mag w/BR3
    3.0 Alfa1
    I agree with your thought that the sensor is a piece of crap... What do you think about the shut down at 3200 RPM? Related??
     
  6. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx 502 mag
    2005 Baja 242 islander 496
    502 mpi Bravo 1
    496 mag B1
    Don't know about a boat of your age, mine won't do that. Reduces power by 11 % thru the entire rpm range
     
  7. Happy Angel II

    Happy Angel II Member

    35
    Sep 11, 2016
    Palm Harbor, Florida and Gray, ME
    260 2015 Sundancer DA
    180 2001 SeaRay BR
    350 Mag w/BR3
    3.0 Alfa1
    Yes...I suppose every engine is different...Do you think it's possible that the new sensor could be the issue??
    I'm wondering if, for some reason it's shorting out around that range.... it's a head scratcher!!!
    Thanks for your thoughts,
    Larry
     
  8. techmitch

    techmitch Well-Known Member PLATINUM Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Seems like that is a circuit code as opposed to a high or low pressure code.
    file:///C:/Users/Kathy/Downloads/512au5re9znf.pdf
    Try to induce the opposite or different code by unplugging the sensor or jumping the sensor wires.
    How many wires does the sensor connector have?
     
  9. Happy Angel II

    Happy Angel II Member

    35
    Sep 11, 2016
    Palm Harbor, Florida and Gray, ME
    260 2015 Sundancer DA
    180 2001 SeaRay BR
    350 Mag w/BR3
    3.0 Alfa1
    Hi Mitch,
    Thanks for your response..much appreciated!!
    To your question. I believe there are three wires connected to the pig tail..I'll have to check.
    I believe your suggesting that I run the boat with the sensor disconnected. Do you think that would cause any major problems??
    Your 270 looks great!!
    Cheers,
    Larry
     
  10. PlayDate

    PlayDate Well-Known Member

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    I believe Mitch is suggesting you are getting an erroneous code. By unplugging the sensor you definitely should get another code but I'm not sure how that helps.

    That said....code 25 is: Sea Pump Circuit Lo shows up at 90% power and allegedly is a Short in the Water Pressure Circuit. Most of the time replacing the sensor solves it because the sensor does not produce the voltage expected at a given rpm. That said....check the wiring going to the sensor and the connector.

    Also.....did your mechanic check for a software update? I seem to recall some sensor calibration issues that they addressed with later releases.

    I agree with @scoflaw that the sensor is problematic.
     
  11. Happy Angel II

    Happy Angel II Member

    35
    Sep 11, 2016
    Palm Harbor, Florida and Gray, ME
    260 2015 Sundancer DA
    180 2001 SeaRay BR
    350 Mag w/BR3
    3.0 Alfa1
    Thank you John, and everybody else that has responded to this thread.
    The concensus, I think is the sensor is defective. Another $165.00.
    Again. Many thanks,
    Larry
     
  12. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx 502 mag
    2005 Baja 242 islander 496
    502 mpi Bravo 1
    496 mag B1
    Just spent similar money on OEM and it only lasted 15 hours. Went with a $15 Chinese knockoff, it's not accurate but it keeps my PCM happy with no alarm or power reduction.
     
  13. b_arrington

    b_arrington Well-Known Member GOLD Sponsor

    Feb 21, 2007
    Setauket, NY
    Back Cove 37
    AB Ventus 9VL
    Cummins QSC 8.3 600
    I’ve had that OEM water pressure sensor be bad when new, out of the box. They are troublesome. I was able to return it as defective.
     
    PlayDate likes this.
  14. Tri County Trail

    Tri County Trail Member

    51
    Aug 29, 2021
    2005 Rinker 360
    Mercruiser 8.1l Bravo 3s
    More on the code 25 water pressure switch

    Where are up getting this code 25 with a scanner of vessel view?
    What audible alarm are you getting from guardian alarm, constant alarm or 2 beeps once per minute.

     
  15. Tri County Trail

    Tri County Trail Member

    51
    Aug 29, 2021
    2005 Rinker 360
    Mercruiser 8.1l Bravo 3s
    Sounds like it is a Overheat in port or starboard Exhaust Manifold Coolant Temp (EMCT), 212°F (100°C)
    limit
    NOT pressuse but flow related. there are two other sensors on exhaust manifold.
    use a scanner on the engine it will show much more info.
    Capture.JPG
     
  16. Jimmy Buoy

    Jimmy Buoy Well-Known Member

    Dec 3, 2008
    Sarnia, Ontario, Canada
    2004 Formula 27PC
    Twin Merc 4.3 MPI/Bravo III
    My scan tool lists my engine's block water pressure norms to be between .5 and 15 psi (assuming .5 at idle).
     
  17. Happy Angel II

    Happy Angel II Member

    35
    Sep 11, 2016
    Palm Harbor, Florida and Gray, ME
    260 2015 Sundancer DA
    180 2001 SeaRay BR
    350 Mag w/BR3
    3.0 Alfa1
    Good morning,
    The digital dash. The tach beeps and flashes two five. Then engine cuts back to around a thousand.
    As I recall...the VesselView shows normal pressure and temperature. This only happened at higher RPM. The last time it happened the engine was at thirty-two hundred RPM. It never shows it's ugly head at lower RPMs.
     
  18. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx 502 mag
    2005 Baja 242 islander 496
    502 mpi Bravo 1
    496 mag B1
    Freeze frame data with a scanner will tell you exactly what's going on.
     
    techmitch likes this.
  19. Happy Angel II

    Happy Angel II Member

    35
    Sep 11, 2016
    Palm Harbor, Florida and Gray, ME
    260 2015 Sundancer DA
    180 2001 SeaRay BR
    350 Mag w/BR3
    3.0 Alfa1
    Not familiar with that. How does that work?
     
  20. Happy Angel II

    Happy Angel II Member

    35
    Sep 11, 2016
    Palm Harbor, Florida and Gray, ME
    260 2015 Sundancer DA
    180 2001 SeaRay BR
    350 Mag w/BR3
    3.0 Alfa1
    Sensors in the exhaust manifolds. I'll look into that..
    Thank you Tri county
     

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