Speedo Failure

Well, volt check of lead plug to sensor plug and i get 11.6v so there is power going to sensor. Doing another check of sensor plug connections and turning wheel and now no Volts. Reconnect speedo and run and speedo worked for about ¼ mile and stopped again. Removed sensor and no build up of debris. Looks like I will have to bite the bullet and get a new sensor. Ouch! Unless anyone has any other ideas.
 
Thats assuming it is the ABS pulse generator (sensor)

It could well be a worn Cardon drive

I had similar until my rear drive was rebuilt , never had a failure from that day on ..

might be worth a bit further investigation before you splurge
 
Steve E said:
Well, volt check of lead plug to sensor plug and i get 11.6v so there is power going to sensor. Doing another check of sensor plug connections and turning wheel and now no Volts. Reconnect speedo and run and speedo worked for about ¼ mile and stopped again. Removed sensor and no build up of debris. Looks like I will have to bite the bullet and get a new sensor. Ouch! Unless anyone has any other ideas.
Click to expand...
Volts to sensor means nowt, you need to see the pulses on an oscilloscope - , and understand how the pulse generator works

Its affected by air gap to reluctor ring, (which is sitting inside the rear drive) i'ts the reluctor ring which affects the magnetic field generated by the (sensor) , this causes pulses which are read and interpreted by the ABS module

You need to confirm the pulse generator is Kaput first
 
Santa-2512 said:
Volts to sensor means nowt, you need to see the pulses on an oscilloscope - , and understand how the pulse generator works

Its affected by air gap to reluctor ring, (which is sitting inside the rear drive) i'ts the reluctor ring which affects the magnetic field generated by the (sensor) , this causes pulses which are read and interpreted by the ABS module

You need to confirm the pulse generator is Kaput first
Click to expand...
Would like to know where I'm going to borrow an oscilloscope from? None of my local garages have one that they are willing lend and won't actually do any diagnosis for me and local dealer wants lots of ££s to test bike. Getting to the stage where I'm going to scrap it.
 
Steve E said:
£160 quid from Motorworks. Over £200 from local dealer!!
Click to expand...
My experience was different. I headed to motorworks for rear sensor and the important washers. They were same price as BMW. I could even dig receipt out if need be but it was just over £90. Two year warranty on the BMW part as well I believe.
 
Santa-2512 said:
Volts to sensor means nowt, you need to see the pulses on an oscilloscope - , and understand how the pulse generator works

Its affected by air gap to reluctor ring, (which is sitting inside the rear drive) i'ts the reluctor ring which affects the magnetic field generated by the (sensor) , this causes pulses which are read and interpreted by the ABS module

You need to confirm the pulse generator is Kaput first
Click to expand...
You do understand I have no ABS, I just have the circuit board for the ecu. I have just done a complete abs removal as the servos failed and I had no brakes. The speedo worked for a week after I removed the abs before it failed.
 
TOG said:
My experience was different. I headed to motorworks for rear sensor and the important washers. They were same price as BMW. I could even dig receipt out if need be but it was just over £90. Two year warranty on the BMW part as well I believe.
Click to expand...
Just checked with Motorworks and it is £160.01 for the sensor.
 
Steve E said:
Just checked with Motorworks and it is £160.01 for the sensor.
Click to expand...
I see your in Oxfordshire. Mine came from North Oxford. Just checking receipt now
309825 sensor, 309825 centr r, and final drive o ring paid £99.25
maybe they are different parts to what you need.
 
TOG said:
I see your in Oxfordshire. Mine came from North Oxford. Just checking receipt now
309825 sensor, 309825 centr r, and final drive o ring paid £99.25
maybe they are different parts to what you need.
Click to expand...
What year is your bike. The sensor changed after 2007 according to NoG just now.
 
Steve E said:
No Play in rear drive. Removed speed sensor and it had a christmas tree of debris. Carried out final drive oil flush and replenish. Took for ride and still no speedo. Thinking of getting a new speed sensor and see what happens.
Click to expand...
Seems to me that you are possibly not addressing the “elephant in the room”
You may want to investigate where the metal on the sensor came from before spending on the new sensor
 
mikeyboy said:
Seems to me that you are possibly not addressing the “elephant in the room”
You may want to investigate where the metal on the sensor came from before spending on the new sensor
Click to expand...
Borrowing a borescope tomorrow so i can look inside the FD and see if there is any indication of breakdown. Given the FD a flush out with flushing oil and no other debris has been flushed out.
 
mikeyboy said:
Just drop the unit down and check for play on the input pinion,
If you lightly grip the splined input shaft with a pair of mole grips and give it a rock,probably all will be revealed.
Click to expand...
Done that no play whatsoever, turns smoothly with no lateral movement or forewords and back. Just shone a torch through the sensor hole and turned FD watching the sensor ring. No sign of any adverse wear. Will check tomorrow with borescope through drain hole and sensor whole. If all looks good I will bite the bullet on a new sensor.
 
Steve E said:
After the shenanigans of removing the servo abs and being happy with 'normal' brakes the speedo has now stopped working. Happily riding along, stopped at traffic lights. On pulling away no speedo. Anyone have any clues as i am all out of ideas.
Click to expand...
Had similar speedo problem after bouncing down a pavement kerb. Speedo stopped working then started working again after ignition switched off for a while then stopped working again after stopping at a traffic light then came back on after 0.5 mile or so. havent had any more bother with it and switching the bike off for a while seemed to re-set the speedo.
 
Well, old speed sensor tested on an oscilloscope that a work colleague has. Its kaput. New sensor fitted and all is now good in the world. So ABS removal and new speed sensor come to about £260 with the sensor being the bigger part of it.
 
Resurrecting this thread because my speedo stopped working yesterday.
I had removed the rear wheel to clean it thoroughly and thought I must have disturbed or damaged something but no, all looks fine.

So I’m expecting a faulty sensor or damaged wiring somewhere.

Connected up the GS911 but no faults noted and it also exercised the speedo fine.

Can anyone tell me the wiring routing after it gets to the seat base?

2010 TC.

Thanks.
Rich
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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