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Old 11-30-2012, 09:03 PM   #1 (permalink)
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Question Speedometer Stop Functioning

The speedometer on `02 Sprint ST stop working.Any suggestions for trouble shooting or parts failure?



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Old 11-30-2012, 09:41 PM   #2 (permalink)
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On a 955 ST, the first place to look is the magnet ring inside the speed sensor on the front wheel. I'm in the process of dealing with this on my RS right now.

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Old 12-10-2012, 02:35 PM   #3 (permalink)
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I had the same problem on my 01 ST. Cause was put down to the cable from the front wheel mounted sender being too tight & I assume damaging the cable.
Replacement was left with ample free play to allow for full fork travel.

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Old 12-11-2012, 12:19 PM   #4 (permalink)
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Try putting a charge on your battery

My '02 Sprint RS has the flaky speedo issue, which in some cases is due to a very slightly low volt condition at the battery. In my case the charging system is fine, the battery always has plenty of juice to crank the engine, and never measures below 12.5 volts, but the speedo will read 0mph. I unplug my headlights and run the motor for a few minutes, restart and have a working speedo again. Early versions of the ECU program had the speedo stop working when the battery was low, I just programmed a newer EFI map that has the speedo/low battery function removed, but haven't had a chance to test it thoroughly yet to see if that fixed my problem. Good luck!
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Old 12-11-2012, 12:51 PM   #5 (permalink)
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Fred, I believe that's an RS thing that doesn't happen with the STs.

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Old 12-12-2012, 02:31 AM   #6 (permalink)
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It happens on the ST too. I had a dead speedo once due to a loose battery terminal that interfered with charging.
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Old 12-12-2012, 02:35 AM   #7 (permalink)
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Ah, good to know. Thanks, Kevin.

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Old 12-12-2012, 02:48 AM   #8 (permalink)
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So if it's the same as an RS, a speedo that reads zero is probably battery and a speedo that jumps around is probably the sender in the front wheel.

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Old 12-12-2012, 04:35 AM   #9 (permalink)
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Information from tune ECU custom tune web page. See ref to low voltage speedo error

10158MapPKTour.hex md5checksum Identical to the 10130PKTour, but on the basis of 10158 and thus with no "Speedo error checking" which led
to the failure of the speedometer when the battery voltage is a bit too weak.

So you need a 10156 standard tune or10158 tors tune with no SAI
or 10157 standard tune or 10159 tors tune if you have SAI on your motor
This will Fix low voltage speedo error fault.
Cheers Paul

Last edited by PaulM; 12-12-2012 at 04:44 AM.
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Old 12-12-2012, 09:43 AM   #10 (permalink)
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I believe 10156 (standard) is the one that has the error check, and 10158 (TOR) does not. I could be wrong again, but I think that's why the tune mentioned above is based on 10158.

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-Kit
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