[David nurney]

bmw r1200gs , 2005, 86,000mls , abs removed (electrics still connected )
had this bike as a non runner now working great , ive moved on the the riding problems now , very rusty coil springs new ones coming , next the main thread of the enquiry , on a local first ever run on the bike (which I loved) I was alarmed to see the speedo wavering and the odometer putting on loads of miles ?? its putting on lots of miles , ive ridden it about 20 miles and it says I have done hundreds?? why, anybody help , thanks Dave

 

[PerazziMx14]

The speedo sensor runs on off the rear wheel. Either damaged sensor, wrong sensor or miss matched rear drive

 

[David nurney]

thanks for that , I have had the rear wheel sensor out was dirty cleaned it a refitted it , still same fault , rear drive has never been changed so may be a faulty sensor? can these be tested? cheers

 

[PerazziMx14]

If memory serves you recently bougth this bike and it was throwing lots of faults and codes?? Do you know the history or any part of the history of the bike?

If by tested you mean with something like a multimeter, no it cannot be tested. To test it you'd need to use something like a GS911 to be able to see the sensor on your computer.

 

[David nurney]

hello , the bike has had a full service history (stamped service book) , yes I have had the bike a couple of months now ,bought it as a non runner (ews fault) , now running great , ive checked the bike fault codes (motoscan) no faults found after road test,cheers

 

[David nurney]

hello , any body any ideas why my bmwr1200gs 2005 86.000mls odometer is reading excessive odometer mileage? ive travelled 20 odd miles and the wavering speedo reads 850MLS ????? have abs removed and still has the modulator fitted , new speed sensor fitted still the same , no other mods , same gears and tyres ect.WHATS going on??? any ideas please ? someone must have had the same problem

 

[Krons]

I would suspect wiring to that ABS/speedo sensor in the final drive. Do you have any codes? What happens if you drive with the rear ABS/speedo sensor disconnected? A wiring issue may give a faulty (and high) speed reading.

An old thread that may help give some clues:

Please help. Odometer 999999/Battery drain/ZFE issue?

Servus! Couple friends recommended this forum due to its invaluable and knowledgeable resources.. I'm hoping you guys can help me out before I take my '08 R1200GSA (75k miles) to the stealership. I had a busted front/left turn signal (still working, just clear lens was broken off) and got...

www.r1200gs.info

 

[David nurney]

hello thanks for reply , ive checked the codes on motoscan and its all clear , a strange thing though if a unplug the abs module the speedo will stop but the rear brake light still works? ive been reading the forums and it says that an unplugged module will give speedo and brake failure? I only have no speedo?

 

[Krons]

Brake light should be fine, ABS would not works when disconnected.

I would chase the wiring further up on the harness, or get another sensor, or check final drive for a whole bunch of metallics messing up the sensor. Last time the oil was changed?

It is something in that sensor circuit or how that sensor is reading.

 

[David nurney]

hello , thanks for that , I have replaced the speedo sensor , the old one was dirty and cleaned still no good so I replaced it, will replace the gear oil as don't know when it was last done , I did wonder if there is another source of signal say alternator making another possible interference ?? don't know, thank you

 

[PerazziMx14]

hello thanks for reply , ive checked the codes on motoscan and its all clear , a strange thing though if a unplug the abs module the speedo will stop but the rear brake light still works? ive been reading the forums and it says that an unplugged module will give speedo and brake failure? I only have no speedo?

This is normal as the speedo and brake lights are run from the ECU on the ABS pump. This si why I suggest when bypassing the servo brakes you simply abandon the ABS pump in place instead of separating the ECU from the ABS pump so you can unplug the wiring. Letting the old pump in place also means you do not have to cap and seal the back of the ECU and fashion a mount for it.

If you just remove the brake lines going to a from the pump and suck out as much of the old brake fluid as possible in stall the f/r jumpers there is no threat of messing up the wiring or board inside the "brain" and the conversion time is reduced by 75%.

 

[David nurney]

hello , the abs pump has been removed and the ecu in mounted on a bracket in its place , ive even refitted the abs and ecu and still speedo / odometer same fault excessive mileage added.cheers

 

[David nurney]

was thinking next time the tank is off I would try disconnecting the alternator and see if that's the problem with interference on the abs module/speedo problem I have

 

[PerazziMx14]

hello , the abs pump has been removed and the ecu in mounted on a bracket in its place , ive even refitted the abs and ecu and still speedo / odometer same fault excessive mileage added.cheers

Wonder if you damaged some of the wiring or connectors inside the pump when you unplugged the two ribbons?

The alternator should have no effect on the speedo/ODO

 

[David nurney]

don't think there is any damage to the abs ecu disconnecting the wires? I wondered if there was some other input for the speedo that could be causing the problem?? dunno, cheers