TnT899s doesn't start
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Thread: TnT899s doesn't start

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    Member Adonis's Avatar
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    TnT899s doesn't start

    Hi guys!
    my battery was almost flat, due to a hard start, so I tried to fire up the engine with a car battery (same voltage). After that, the start button does not work, there are no lights or instruments, and the engine light stays on. The fuses are fine. Any ideas? Could it be the ECU?
    I appreciate your help

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    Senior Member StingerWolf's Avatar
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    Test another battery I had this problem few years ago. I bought a new battery and all was fine again.

    And never take a car for jump starts

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    Senior Member Rick67's Avatar
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    Have a look at the relays hopefully it's just one of those .
    It may be the fuse on the starter relay at the side of the bike .
    Also agree to never use a car battery .
    Or maybe it's the extra battery cable on the negative side not been put back on if you removed the battery .. it has a habit of hiding !

    These bikes don't like to be started with a failing battery .
    Try a new one
    Last edited by Rick67; 03-21-2019 at 02:29 AM.
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    Member Adonis's Avatar
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    I did try a new battery -a lithium one-, before screwing it up, but it got discharged without starting the engine. Main fuse and cables are ok, clutch and side stand sensors working and the main relay sounds when I turn the key on, so it seems to work. I ordered a lithium charger, so i'll try to start the engine after charging the new battery, but i'm afraid it won't work...

    Thanks for answering guys, there are no specialized mechanics around here ...

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    Senior Member StingerWolf's Avatar
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    I believe you have to reset the TPS

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    Member Adonis's Avatar
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    So far I've checked fuses, dash and emergency, clutch and side stand switches. I steel need to check start relay and motor. After that, if everything's ok, with a fully charged battery the bike should start. Finally, a TPS reset must be performed (so, I need to get a Tunecu cable). Am I missing something?
    Thanks for your help guys, I'll be back when I'm done.
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    Member Adonis's Avatar
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    Thumbs up

    Fortunately, it was the battery; now my TnT starts at once... and weighs 3,2 kg less
    I wonder if removing the main fuse will protect the battery from discharging.

    By the way, a lithion battery won't be charged by a li-ion charger if its voltage is below 8V; you need to reach first 9-10V with a conventional charger (never over 15V), before charging with the li-ion one.

    thanks a lot guys

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    Senior Member Rick67's Avatar
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    Nice one ! ... glad it was only a flat battery after all. You'll have no problems with that again I'm sure now you've gone lithium.
    One thing I would check before you pull the main fuse is that you don't have current drain on the battery when the ignition is off .
    Plenty of videos on YouTube showing how to do it .. if you've not done it before that is .

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    Member Adonis's Avatar
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    There is no current drain on the circuit, but I'm still having the hard start problem. The battery is strong and rotates the engine with power, but there is no ignition
    Maybe I need to reinstall the map, since this happened the first time I connected the ECU to the Tuneecu software. It could also be a mechanical problem, maybe the starting gear. I'll check both, if I have some time this weekend.

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    Senior Member Rick67's Avatar
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    hmm....very odd . starts one day but not another.
    id be looking to see if the stepper motor is working correctly that may be part of the issue.
    im guessing you've got new ish plugs fitted ? iridium ones work best in my opinion.
    also good ecu mapping is key on these bikes ive found.
    hope you get it sorted soon

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