Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 24
  1. #1
    wedoseadoo's Avatar
    Join Date
    Sep 2006
    Location
    lake martin, al
    Posts
    220

    Tops problem on 2005 GTX 4tec

    Okay lets start at the beginning, the customer jumped off the ski with a set of jumper cables, + jumper cable grounded out taking out the MPEM, he brings me another MPEM, I install it and everything seems to work fine, I cut the ski loose. Months go by and I get a phone call, ski is not charging and is in limp mode, I trace the charging system issue down to a bad rectifier-regulator. The ski is still in limp mode and trowing a code for TOPS, I check the module and it is a different part number and appears to be for a 2002 model GTX 4TEC. TOPS solenoid , actuator whatever you want to call it appears to be working properly, if you take the TOPS switch and flip it while running it does not appear to do anything, I ran it with another TOPS solenoid hooked to it and nothing happens when you flip the switch upside down.TOPS switch has been replaced with a new one.

    I am thinking the MPEM'S are not compatable even though they hook up the same and seem to work, one difference I do note is that the 2002 just has a two wire mercury style switch and the 2005 ski has a three wire switch with a check ball. Can anyone shed some light on this, did he possibly fry the ECU when he jumped off this ski or is it an MPEM compatability issue?


  2. #2
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,930
    +1
    1,407
    Have you checked the TOPS valve it is found on 02-05 4-Tec's.

  3. #3
    wedoseadoo's Avatar
    Join Date
    Sep 2006
    Location
    lake martin, al
    Posts
    220
    What are you calling a valve? if you mean the part next to the filler held on with two screws, yes, it seems to be working properly, I also pulled one off another boat and plugged it in to see what happened when the switch was held upside down, it does nothing when you flip the switch but does cycle on and off when the lanyard is installed or the timer circuit goes off.

  4. #4
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,930
    +1
    1,407
    Its on the front of the engine just in front of the valve cover.. Make sure you have the correct electrical plug connected to it as it is the same style shape as the front oil pressure switch. The TOPS is two wire and the oil pressure is one wire.

  5. #5
    wedoseadoo's Avatar
    Join Date
    Sep 2006
    Location
    lake martin, al
    Posts
    220
    yes it is connected correctly , two wire connector is on the TOPS valve, its kicking off the dreaded 1502 code, I have done several searches here, from what I have read no one really seems to know how to get rid of that code. Checked TOPS valve, replaced TOPS switch, checked wiring and pin connectors on ECU and MPEM, all look fine.

  6. #6
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,930
    +1
    1,407
    Its possible you have a bad TOPs solenoid. I know the two nuts on top of the valve like to rust.. Maybe a bad connection or the valve is bad. Give me a sec and ill check the manual for a test procedure.

  7. #7
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,930
    +1
    1,407
    TOPS VALVE
    The valve is turned on as soon as safety lanyard
    is installed on its post. The valve opening allows
    ventilation of crankcase.
    The OSPS monitors the pressure to detect a malfunction
    of this valve. If pressure rises above a
    preset threshold (40 kPa (6 PSI)), the valve is re-energized
    again and if it fails, a fault code is generated.
    The TOPS switch, located besides the MPEM (on
    MPEM bracket), monitors the watercraft position.
    If the watercraft rolls above a preset threshold (or
    tips over) the switch opens and the ECM closes
    the valve to prevent oil in engine crankcase to
    flow towards intake manifold. Besides, the engine
    RPM will be gradually reduced then engine
    will be stopped.
    128 smr2005-


    Dynamic Test
    Activate the TOPS valve by installing the safety
    lanyard on the DESS post.
    If you can hear the movement of the piston (knocking),
    the valve works fine, otherwise follow the
    procedure shown in the following chart.
    NOTE: Take into account that you could hear the
    piston movement and the valve might not be
    working properly. The retaining washer could be
    unlocked from the piston shaft. Disassembly will
    reveal its condition.

    Resistance Test
    Disconnect the connector from the TOPS valve
    and check the resistance of the solenoid itself.
    The resistance should be between 1.27 ohm and
    2.47 ohm.
    Otherwise, replace the TOPS valve.

  8. #8
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,930
    +1
    1,407
    Pic from above.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	2005 Sea-Doo Engine Service Manual_0001.jpg 
Views:	1298 
Size:	76.8 KB 
ID:	244135   Click image for larger version. 

Name:	2005 Sea-Doo Engine Service Manual_0000.jpg 
Views:	382 
Size:	90.4 KB 
ID:	244136  

  9. #9
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,930
    +1
    1,407
    Interesting note: Its possible that you have a bad OSPS or low oil pressure. I would be leaning towards the TOPs valve itself. But as you know anything is possible.

    The OSPS monitors the pressure to detect a malfunction
    of this valve. If pressure rises above a
    preset threshold (40 kPa (6 PSI)), the valve is re-energized
    again and if it fails, a fault code is generated.The OSPS monitors the pressure to detect a malfunction
    of this valve. If pressure rises above a
    preset threshold (40 kPa (6 PSI)), the valve is re-energized
    again and if it fails, a fault code is generated.

  10. #10
    wedoseadoo's Avatar
    Join Date
    Sep 2006
    Location
    lake martin, al
    Posts
    220
    Tops valve appears to be function correctly, I pulled one off another ski and hooked it up and watched the operation of it,the weird thing is when you flip the TOPS switch upside down nothing happens with the TOPS valve, I also swapped out a known good OSPS and there was no change,still in limp mode, TOPS valve ohms out at 2.0 ohms resistance which should be in spec. I am still questioning the ECU as being bad.

Page 1 of 3 1 2 3 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. TOPS Functional Problem on 07 GTX SC
    By Andrew1989 in forum Open Discussion
    Replies: 0
    Last Post: 07-05-2014, 02:44 PM
  2. Installing Fizzle IC on 2005 GTX
    By North Valley in forum 4-Tec Performance
    Replies: 2
    Last Post: 05-31-2011, 07:04 AM
  3. weird problem on 96 gtx 787, need advise
    By Alex3012red in forum 2-Stroke Performance
    Replies: 7
    Last Post: 05-15-2011, 12:26 PM
  4. 'Maint' message on 2005 GTX
    By wilbur1 in forum Sea Doo Open Discussion
    Replies: 1
    Last Post: 06-26-2010, 05:11 PM
  5. repairing the Starter on a gtx 4tec pleas help.
    By kabab in forum 4-Tec Performance
    Replies: 7
    Last Post: 11-28-2007, 11:55 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •