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  1. #1
    Click avatar for tech links/info K447's Avatar
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    Yamaha ECU with two connectors, tachometer signal pin?

    On the Waverunners Yamaha changed the ECU in recent years. Prior to 2016 the ECU for 1.8 liter engine has three connectors. I have the wiring diagram for the three connector ECU and found the tach signal on ‘pin-82’ of the third connector.

    Now the 1.8 liter engine ECU has only two connectors, with 44 pins each. I would like to identify which pin carries the tachometer signal. On the waverunners this pin is unused/capped and not marked on the wiring diagram. There are many other unused/capped pins on the connectors.

    I am hoping the wiring diagram for a recent model year Yamaha boat has the tachometer wiring shown and the ECU pin connection identified.

    Can someone point me towards a Yamaha boat wiring diagram that includes the ECU tachometer info?

    Thank you.

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  3. #2
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by K447 View Post
    On the Waverunners Yamaha changed the ECU in recent years. Prior to 2016 the ECU for 1.8 liter engine has three connectors. I have the wiring diagram for the three connector ECU and found the tach signal on ‘pin-82’ of the third connector.

    Now the 1.8 liter engine ECU has only two connectors, with 44 pins each. I would like to identify which pin carries the tachometer signal. On the waverunners this pin is unused/capped and not marked on the wiring diagram. There are many other unused/capped pins on the connectors.

    I am hoping the wiring diagram for a recent model year Yamaha boat has the tachometer wiring shown and the ECU pin connection identified.

    Can someone point me towards a Yamaha boat wiring diagram that includes the ECU tachometer info?

    Thank you.
    what signal do you get from plug 1 , pin 8 or plug 2 , pin 47 ?
    It is the pickup coil signal wire that goes into ecu and up to dash ( I ASSume that's the rpm feed).
    Its the same on the tr1/mr1/1.8 ..
    Just diff wire,Same color.W/B . pin 42 pickup to ecu and pin 43 to dash.
    I think you need a service manual for the sx210, I looked but could not find in pdf..

  4. #3
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by KEYZBUM View Post
    what signal do you get from plug 1 , pin 8 or plug 2 , pin 47 ?

    It is the pickup coil signal wire that goes into ecu and up to dash ( I ASSume that's the rpm feed).
    Its the same on the tr1/mr1/1.8 ..
    Just diff wire, Same color. W/B . pin 42 pickup to ecu and pin 43 to dash.
    I think you need a service manual for the sx210, I looked but could not find in pdf..
    I do not have a two connector ECU Yamaha.

    On the prior generation three connector ECU the tachometer signal on pin-82 has six pulses per engine revolution. Pin-82 had no factory wire at all on my 2017 SVHO, it was an empty pin location. I added a wire and that provides a reliable clean tach signal.

    I presume that six-pulse tachometer signal is generated within the ECU. I suppose it could simply be a repeated signal from a sensor on the engine.

    I have never seen a Yamaha wiring diagram that identified a tachometer signal wire on the two connector ECU. That tachometer pin/wire is what I am looking for.

    2016 TR-1 two connector ECU wiring, VX Deluxe model IIRC;

    Lots of open pin connections, all unmarked.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by K447; 02-22-2021 at 08:35 PM.

  5. #4
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    plug 1 , pin 8 or plug 2 , pin 47
    Is for you to test on the 3 plug ecu..

    Its the same on all the wiring, so if it goes from coil to dash you might grab a signal from it/maybe..

    edit
    I added a pdf with 3 plug pin info
    Attached Files Attached Files
    Last edited by KEYZBUM; 02-22-2021 at 10:27 PM.

  6. #5
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by KEYZBUM View Post
    plug 1 , pin 8 or plug 2 , pin 47
    Is for you to test on the 3 plug ecu..

    Its the same on all the wiring, so if it goes from coil to dash you might grab a signal from it/maybe..
    Looking at the wiring diagram for my 2017 SVHP GP1800;

    plug 1 , pin 8 is W/B wire, goes from pickup coil to ECU. Does not go anywhere else

    plug 2 , pin 47 is W/B, goes to the dash. I suppose that could be a tach signal.

    My SVHO machines are packed away in winter storage, but someone with access to another could do some signal checking.

    Would be really interesting if pin-47 and pin-82 were directly linked, with zero ohms between the pins. This seems unlikely to me.
    Last edited by K447; 02-22-2021 at 08:34 PM.

  7. #6
    Click avatar for tech links/info K447's Avatar
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    Possibly making some progress.

    I/we now suspect that on the Yamaha two connector ECU that pin 29 might provide the same tachometer signal that is present on pin-82 with the three connector ECU.



    I do not have access at the moment to a ski with two connector ECU*. If someone does, could you probe pin-29, start the engine and view the signal on an oscilloscope? Much appreciated.

    Hopefully the signal looks like this



    * Apparently all TR-1 engines use the two connector ECU, as do 2018 onwards 1.8 liter Waverunner engines. I am presuming the 3 and 4 cylinder versions of the two connector ECU would have the same pin for the tachometer signal.

    OR, if you happen to have a 2017 Yamaha SX210 boat with the TR-1 engine, an oscilloscope view of the signal that goes to the dash tach would be helpful. Until yesterday I did not know Yamaha even put TR-1 engines in a boat. 2017 year had a regular tach on the dash, apparently in later years the boat has an integrated dash similar to the waverunners.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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