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Mm128
Posted on Thursday, August 14, 2008 - 08:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Bike: 1999 S3

Ok.. My spedometer/odometer were NOT reading..

The odometer displayed the mileage but did NOT increase while riding and the Odometer did not move AT ALL.


I bought a NEW speed sensor and installed it... STILL A NO GO....

I checked the main fuses under the seat and ALL looked good.

Any suggestions???
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Spiderman
Posted on Thursday, August 14, 2008 - 08:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Checked by visual inspection or checked buy testing?
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Mm128
Posted on Thursday, August 14, 2008 - 08:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

On the fuses... I checked by pulling them to make sure they were intact...

Is there a specific one that would control the spedometer???

I did notice that the sensor wire runs up into a bundle... then goes back towards the cylinders...... is there ANOTHER area that i should check out??

Thanks
Matt
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Oldog
Posted on Friday, August 15, 2008 - 12:24 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Matt
fuses
accessories
and memory / instrument

White wire is the pulse to the speedo / odo

colors listed and functions

silver blue/white ---------- trip reset (a)
white / green -------------- pulse to meter / odo
red ------------------------ trip memory
orange white --------------------- accessory feed (+12v)
black ---------------------- trip reset (b)/ground

speed / freq (from fsm) mph 20, 40, 60, 80,
---------------------------- frq 432, 864, 1296, 1728

I have no idea of the exact workings of the speed sensor this may not work

I use this to test turbine flow meter pickups ( similar idea to ss )

sensor connected to bike wirirng,
use a drill with a key type chuck hold the
sensor nose ( in the gear box part ) next to the key teeth and spin the drill

with the sensor hooked up the speedo should respond and the odo count

it sounds like no pulses gettin to the meter, the fsm has an error that "the odo will register if the SS is bad" - not so.

there are 2 set of connectors that have to work, sensor to harness, and harness to meter.
+ all devices and wires

a stupid test
unhook tach line like the speed sensor it SHOULD be "switched ground"
(PINK) swap that to the speedo ( white ) idle engine

speedo no work possible meter wires sender?
move speedo to tach try drill(above)
tach work?
yes, speedo ?, sender ok wires ok

this is called subistute testing

( unless you have access to the frequency generator [aka speedo tach tester] )

a multi meter check for power at sensor connector on main harness is in order.

(Message edited by oldog on August 15, 2008)
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Mm128
Posted on Friday, August 15, 2008 - 07:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Oldog,

THANK YOU. I will give it a go today after work.

Thanks again,

Matt
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Spiderman
Posted on Friday, August 15, 2008 - 08:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I checked by pulling them to make sure they were intact...

That would be visual.

Yes there is a fuse to control the speedo.
I have had fuses that looked fine but a quick test shown that they were in fact blown.

Not in the sense that the link had melted but instead cracked. Causing the same problem you are having.

If you do not have a fuse tester, use a voltometer. If you do not have either, well replace the fuse ; )
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Mm128
Posted on Friday, August 15, 2008 - 08:30 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Spiderman,

Sounds good... there cheap anyways...

I will just replace them all today.

Matt.
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Spiderman
Posted on Friday, August 15, 2008 - 08:34 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

There should be a label around your tail area that tells you which fuse is your speedo.

If you do not have a manual or said sticker has worn off I am sure some here can post which location it is.
(if I wasn't at work I would look it up for you)
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Oldog
Posted on Friday, August 15, 2008 - 09:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Good point on the fuses Spidy
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Spiderman
Posted on Friday, August 15, 2008 - 10:30 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I had the same thing happen and went ape shit trying to figure it out, I did everything short of replacing the sensor.

I even took the speedo apart, becasue the fuse looked good. This was before I had my fuse tester so on a whim I replaced my fuse and bingo!
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