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Thread: Starting Issues

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    Trapperdog's Avatar
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    Starting Issues

    2009 ST1300 Police
    Cranks over like a champ but won't fire
    Six weeks ago on a hot day after 200 miles the bike would turn over fine after stopping, but would not start. After fiddling with switches and gas cap it would fire right up after a few minutes over the course of the next 150 miles. Started fine when cold or on short trips the next few days but eventually refused to start. Checked for spark and found none as well as no fuel on the removed plugs. Fuel pump relay kicks in but hard to tell if there was audiable evedience of pump pressurization. Larry and I stripped the plastics and found the bolt loose and slight corrosion on the green ground wires to the frame under the seat, left side. The yellow 12 ground connector as well as the 24 multi connector looked good, we had power to the fuel pump and the bike started and ran well for two weeks.
    After a five hour cool down 70 miles from home the bike again refused to start but still turned over well. Eventually getting it started, it cut out completely while in motion, but would restart while drifting to the side of the road and turning off the ignition (key) and back on. It did this 6-7 times until refusing to start 1/4 mile from home. Again we stripped the plastics and looked closer at the wiring to find the wires to the right knock and neutral sensor brittle, missing sheathing, and connectors partially broken. Replacing the subharnes we found the front oil pressure switch wire sheathing chewed by rodents all the way around exposing 1/2" wire on each. Checked and cleaned all the connectors on both sides as well as the cut off switch on the bars. The bike started and ran fine for a few hours of cone practice, but again refused to start after stopping for dinner, yet still turned over like a champ.
    So....tomorrow I plan on removing the rear plastics to check the ECM pins as well as other rearward connectors. Will also check for fuel pump power as well as spark. Other than a chaffed main harness, the only other possibilities I can think that would allow strong cranking yet no firering are a failing ECM, bank over or crank position sensor. No other anomalies and no codes are being thrown that I know of. Accessories include a gps, on board volt meter, Clearwater lights, police lights front and rear on isolated power and relays, heated gear harness, quarterlet harness triggering the Clearwater relay and powering the volt meter and gps. Apologies for the lengthy post.
    Open to any and all suggestions and responses. Thanks, Roger

  2. #2
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    Trapperdog's Avatar
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    Re: Starting Issues

    No epiphanies?

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    Site Supporter Tom Mac 04a's Avatar
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    Re: Starting Issues

    Fuel pump pressure test ... ? they do act up when warm/hot
    Emergency off switch ?

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    Hueyf4i's Avatar
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    Re: Starting Issues

    Quote Originally Posted by Tom Mac 04a View Post
    Fuel pump pressure test ... ? they do act up when warm/hot
    Emergency off switch ?
    Emergency cut off switch would not allow the starter to work. Do you hear the fuel pump run for a few seconds after you turn the key?

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    Re: Starting Issues

    Quote Originally Posted by Hueyf4i View Post
    The bank angle sensor, emergency cut off switch, and side stand sensor all work the same way. If they are engaged it disables the starter switch.

    Sent from my SM-G955U using Tapatalk


    Sent from my SM-G955U using Tapatalk

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    Site Supporter Tom Mac 04a's Avatar
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    Re: Starting Issues

    Quote Originally Posted by Hueyf4i View Post
    Emergency cut off switch would not allow the starter to work.
    On my 04 it does.... cranks away just fine , but no spark

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    John Heath jfheath's Avatar
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    Re: Starting Issues

    Other things worth checking are the starter relay and its connection spades and wiring; the earthing points; the harness where it passes under the back end of the fuel tank and front of the seat (although this fault on earlier ST1300s was addressed).

    The fault could be to do with any component with a bare live wire momentarily shorting to earth.

    Give the HT leads a once over too. They are a push fit into the coil, once the gland 'nut' has been removed. They are a screw fit into the plug cap - about an inch of HT lead will screw into the cap. Resistance through the plug should be 5Kohm plus or minus a couple of hundredths. Check the Low Tension leads to each coil, and the earth contact to the frame can become corroded.

  8. #8
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    Re: Starting Issues

    Anomalies noted this am:
    No spark
    Back probing the fuel pump connector G and Br/B has a constant voltage of 11.x V with no reduction in V as it should with pressurization. G and Br shows no voltage
    No fuel pump wine, but I never really here it anyway ( hard of hearing)
    No FI light with ignition and switch on as well as with cranking

    ? It the fuel pump is inoperative does the system shut of spark as well?

    i thought the Bank Over sensor, like the Crank Position Sensor, allowed starter rotation but cut off fuel and spark, but could be mistaken
    thanks for the input so far, I'll take sugggestions in account as I move through the diagnosis process
    Last edited by Trapperdog; 08-19-2017 at 03:05 PM.

  9. #9
    Hueyf4i's Avatar
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    Re: Starting Issues

    Quote Originally Posted by Trapperdog View Post
    Anomalies noted this am:
    No spark
    Back probing the fuel pump connector G and Br/B has a constant voltage of 11.x V with no reduction in V as it should with pressurization. G and Br shows no voltage
    No fuel pump wine, but I never really here it anyway ( hard of hearing)

    ? It the fuel pump is inoperative does the system shut of spark as well?

    i thought the Bank Over sensor, like the Crank Position Sensor, allowed starter rotation but cut off fuel and spark, but could be mistaken
    thanks for the input so far, I'll take sugggestions in account as I move through the diagnosis process
    I tested all 3 systems on mine. . Put bike in 1st with sidestand down(starter button disabled, no crank). .Put bike in neutral, lifted side stand, Turned thd emergency cut off switch to "off", (same result). . . Reset switch, then leaned over the bike until it rested on it's engine guard, (same result). . . I did not check spark, so I cannot say either way on that one. My issue is no Fi light when I turn the key and fuel pump activation. .Also, when you turn your key you should hear 2 clicks, in different locations. . (Bank angle sensor, mounted in the upper cowl above the headlights, and the fuel cutoff relay, on the the left side behind the fuse box) still tracking down my issue. .

    Sent from my SM-G955U using Tapatalk

  10. #10
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    Re: Starting Issues

    Ive checked all the relays, connectors, fuses, wiring in the Tail section of bike and all is good. The manual states to check the fuel pump for power between the Br and Gr wires. I get no power there. I still get full power between the Br/Bl and Gr wires though. Jumpering between the battery and the Br/Bl and Gr fuel pump pigtail results in no pump movement. Jumpering from the battery to the Br an Gr pigtail wires and the pump wines. Not sure what that means though. Still no FI light

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