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  1. 02-28-2021, 02:21 PM #1
    Dan929CDX
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    Setting TPS on a 99 250 EFI merc

    I have the harness and when I check my TPS setting my multimeter I get a “.L” and this happened with two different meters. The way I understand the procedure I hook up the harness, turn the key to run and I should see my .95 + or - .05. Is this a symptom of the TPS going bad? I have a little bit of a lean sneeze that I am trying to cure. Any thoughts? I made sure the battery was fully charged...

    I will post the serial number when I can grab it.

    thanks for the help!!!

    Danny
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  2. JOE54
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    #2 03-01-2021, 07:50 AM
    can any voltage reading be obtained by moving switch ?????
    .................................................. ...the scariest thing in life is the unknown ...................................
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  3. EuropeanAM
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    #3 03-01-2021, 11:19 AM
    What reading do you get when you check voltage on the battery terminals?


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  4. Dan929CDX
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    #4 03-01-2021, 11:50 AM
    At the end of the day it was at 12.47 on the battery terminals. It is a three day old X2 31 group AGM.
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  5. Dan929CDX
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    #5 03-01-2021, 11:58 AM
    Quote Originally Posted by JOE54 View Post
    can any voltage reading be obtained by moving switch ?????
    By moving the switch, which switch are you referring?
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  6. JOE54
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    #6 03-01-2021, 12:23 PM
    throttle position switch /sensor
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  7. Dan929CDX
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    #7 03-01-2021, 12:39 PM
    Quote Originally Posted by JOE54 View Post
    throttle position switch /sensor
    Nope just the .L which I’m assuming means low. I don’t know if both of the multimeters the reading falls below the threshold for a reading. I get a .L at full throttle as well. I’m alittle confused, the boat seems to run fine....
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  8. EuropeanAM
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    #8 03-02-2021, 09:43 AM
    Are you using the TPS Test Harness? Which Part Number?


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
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  9. Dan929CDX
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    #9 03-02-2021, 07:42 PM
    Using the harness, part number 84-825207a1.
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  10. EuropeanAM
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    #10 03-03-2021, 09:17 AM
    Make sure you have the Red (+) test lead to the RED test harness lead.

    Black (-) Negative Test Lead to the WHITE test harness lead.

    Key on- check voltage.

    Move the throttle roller away from the cam and see if the voltage increases.

    Return to idle and see what voltage reads.


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  11. Dan929CDX
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    #11 03-03-2021, 04:42 PM
    Roger, I’ll check that and report back.

    Thanks again for all the help!!
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