Logo
Click for Nissan Tohatsu Manuals, and Parts!
Results 1 to 15 of 15
  1. #1

    Default Tohatsu Md90b, problem ignition coil

    I have a problem with the Tohatsu tldi md90b outboard engine. I start the engine and it works normally. I go with him to the sea and hold him from 3000 to 4000 RPM, after 15 minutes on the tachometer blink
    * 3 lights and the engine lowers the throttle. It's like entering safe mode. Later I run into the error service and show me an error on ignition coil # 2. It doesn't seem to work. I inserted a new ignition coil # 2, but again after 15 mins throw out the same error. Sorry for my language, I do not know English very well.

  2. #2
    Join Date
    Mar 2010
    Location
    Hamburg, NY, USA
    Posts
    2,593

    Default Re: Tohatsu Md90b, problem ignition coil

    Did you put the motor in diag mode to see what it thinks is wrong? Do you have a 900-plus CCA battery?
    Paul
    Certified Tohatsu TLDI Technician
    Hamburg, NY USA

  3. #3

    Default Re: Tohatsu Md90b, problem ignition coil

    I allready put new battery 100Ah, but problem is same.
    When I go in diag mod, you can see picture.


    Click image for larger version. 

Name:	TAHO.jpg 
Views:	7 
Size:	85.3 KB 
ID:	21729Click image for larger version. 

Name:	SERV.jpg 
Views:	6 
Size:	98.2 KB 
ID:	21730Click image for larger version. 

Name:	SERV1.jpg 
Views:	4 
Size:	76.8 KB 
ID:	21731

  4. #4

    Default Re: Tohatsu Md90b, problem ignition coil

    I forget tell, I put new spark, change wires of spark.
    First time I replace Ignition coil #1, with ignition coil#2, then delete fault log, but after 15 min on 3000rpm to 4000rpm, same diag.problem.
    Ignition coil #2.

  5. #5
    Join Date
    Mar 2010
    Location
    Hamburg, NY, USA
    Posts
    2,593

    Default Re: Tohatsu Md90b, problem ignition coil

    I would check to make sure there is a signal from the ECU to the coil. Could be a damaged low-voltage wire to the coil.
    Paul
    Certified Tohatsu TLDI Technician
    Hamburg, NY USA

  6. #6

    Default Re: Tohatsu Md90b, problem ignition coil

    Can I put digital instrument on the primary coil, and test DCV,
    what the voltage should be, 12DCV.

  7. #7
    Join Date
    Mar 2010
    Location
    Hamburg, NY, USA
    Posts
    2,593

    Default Re: Tohatsu Md90b, problem ignition coil

    Analog would be better. But it is a short pulse of about 12v.
    You could also try running with the cowl off, in case something is acting up when hot. Cowl off would let the ECU run cooler, in the rare event that the ECU is failing hot.
    Last edited by pvanv; 09-09-2019 at 09:10 AM.
    Paul
    Certified Tohatsu TLDI Technician
    Hamburg, NY USA

  8. #8

    Default Re: Tohatsu Md90b, problem ignition coil

    Could it be problem with stator, maybe after 15 min stator get hot. I will go test with cowl off and than send you message.
    Last edited by Tohmate; 09-09-2019 at 10:09 AM.

  9. #9
    Join Date
    Mar 2010
    Location
    Hamburg, NY, USA
    Posts
    2,593

    Default Re: Tohatsu Md90b, problem ignition coil

    That motor does not have a stator.
    Paul
    Certified Tohatsu TLDI Technician
    Hamburg, NY USA

  10. #10

    Default Re: Tohatsu Md90b, problem ignition coil

    Click image for larger version. 

Name:	slika.jpg 
Views:	7 
Size:	76.2 KB 
ID:	21736
    2. alternator, not stator. sorry

  11. #11
    Join Date
    Mar 2010
    Location
    Hamburg, NY, USA
    Posts
    2,593

    Default Re: Tohatsu Md90b, problem ignition coil

    With electrical issues, anything could overheat; they can be tricky to isolate.
    Paul
    Certified Tohatsu TLDI Technician
    Hamburg, NY USA

  12. #12

    Default Re: Tohatsu Md90b, problem ignition coil

    Thank you very much for your answers. I Will check with the cowl off.
    Very strange problem.
    Only ecu send signal to ignitio coil.
    Pick-Up Coil?
    Throttle position senszor?
    Mat senzor?

  13. #13
    Join Date
    Mar 2010
    Location
    Hamburg, NY, USA
    Posts
    2,593

    Default Re: Tohatsu Md90b, problem ignition coil

    Any sensor could fail hot, but tha TLDI diags usually see that.
    Paul
    Certified Tohatsu TLDI Technician
    Hamburg, NY USA

  14. #14

    Default Re: Tohatsu Md90b, problem ignition coil

    Hello
    Today I test engine with cowl off, but problem is same.
    I measured compression on cylinders
    cylinder 1 has 9 bars
    cylinder 2 has 2 bars
    cylinder 3 has 9 bars

    I don't know what to do, I guess that's a real problem
    Last edited by Tohmate; 09-11-2019 at 06:46 AM.

  15. #15
    Join Date
    Mar 2010
    Location
    Hamburg, NY, USA
    Posts
    2,593

    Default Re: Tohatsu Md90b, problem ignition coil

    Yes. I would see why cylinder 2 only has 30 psi while the others have 130 psi.
    Paul
    Certified Tohatsu TLDI Technician
    Hamburg, NY USA

Similar Threads

  1. Tohatsu 2008 9.8HP coil infinite resistance in coil...
    By bushtor in forum Nissan Tohatsu Outboard Forum
    Replies: 1
    Last Post: 09-11-2016, 05:57 PM
  2. Tohatsu M18 D Ignition Coil
    By Vespisti in forum Boat Electrical Systems
    Replies: 0
    Last Post: 06-28-2014, 10:57 AM
  3. 165 L6 ignition coil problem
    By holinwtr in forum Mercruiser Sterndrive Forum
    Replies: 12
    Last Post: 05-10-2011, 04:48 PM
  4. Tohatsu M99B2 Ignition Problem
    By phoeffie in forum Nissan Tohatsu Outboard Forum
    Replies: 1
    Last Post: 06-01-2009, 06:19 PM
  5. b96 225hp Mercury ignition coil problem
    By dustincm1100 in forum Mercury Mariner Outboard Archive
    Replies: 0
    Last Post: 07-25-2008, 11:53 AM

Posting Permissions

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