General Category > Technical
K1200S ODOMETER
WayneC:
--- Quote from: martyoz on August 26, 2018, 12:30:52 PM ---
Wayne hi, mate two BMW trained Technicians have been unable to Diagnose the defect ?? To be honest I don't think they have a high level understanding of the Software / Computer Parameters used. I myself do not have diagnostic tool and am in the dark !
Speedo is definitely from Rear wheel and unaffected by the Front Sensor. I was hoping a Guru on this Forum would be able to confirm my theory.
--- End quote ---
As Jughead has confirmed it would be coding of the dash, it is normal that the same signal is used for both ABS & speedo, re 2 trained techs not being able to diagnose, that is unfortunately too common in 650GS models which are referred to me
Can you confirm which type of ABS you have as per Jughead's post ?
martyoz:
Yes it has the 2006 Servo Assisted ABS.
The number crunching is done in the Computer, so regardless of the ABS or the Sensor Ring it ought to be possible to change Numeric values in the Software Parameters ?????
Put it this way, I don't have a 100 segment Ring and have no intention of sourcing one, so all I ask is how to get the numbers changed in the Calculations to ensure the ABS Reaction time and the Odometer is correct.
WayneC:
--- Quote from: martyoz on August 26, 2018, 01:56:47 PM ---Yes it has the 2006 Servo Assisted ABS.
The number crunching is done in the Computer, so regardless of the ABS or the Sensor Ring it ought to be possible to change Numeric values in the Software Parameters ?????
Put it this way, I don't have a 100 segment Ring and have no intention of sourcing one, so all I ask is how to get the numbers changed in the Calculations to ensure the ABS Reaction time and the Odometer is correct.
--- End quote ---
OK, understood re ABS type, basically if the wrong segment rings have been fitted then no you wont be able to change the ODO display but the speedo would also be reading mph
Some further thought is needed, the machine is designed to be either ABS or non-ABS so the signal to the dash is as per the signal tramsmitted by the rear wheel. The ODO then stores the count in SI units and coding, hard coded firmware or links in the dash changes the display between kms or miles
Jughead:
--- Quote from: martyoz on August 26, 2018, 12:51:45 PM ---
Jughead you are incorrect, the Computer software Mathematically calculates Front pulses divided by Rear pulses. 100/78 or 48/78, the Value is then used for ODOMETER & ABS Braking Control (reaction). Rear 78 pulse sensor is all that is used for SPEEDO.
--- End quote ---
Really?
I have a client with 2 sets of wheels for his servo assisted GSA. The set fitted with road tyres are the original wheels off the bike and ABS and Speedo work 100%.
The minute he fits the set of wheels with offroad tyres, the ABS warning light comes on, speedo does not read correctly and odo is way out.
Then I discovered that the two front wheels have different ABS rings. Fitted the offroad front wheel with the same ABS ring as the original wheel and everything is once again 100%.
Please can you explain why this happened, since "the Computer software Mathematically calculates Front pulses divided by Rear pulses."
My guess is that the final drive on your bike has been replaced with one from a later, non servo assisted bike.
martyoz:
OK I am an Electrical & Instrumentation Technician, have worked with very sophisticated PLC's, DCS, DIGITAL DRIVES & all associated field control devices.
The onboard Computer is just a smaller version of an Industrial control system, where software parameters can be set, changed and manipulated then the mathematics are crunched within the computer software. The wheel and final drive sensor is merely a counter, sending pulses to the computer.
If it is possible to access the Software Parameters shown in attached pics ( IF ???? ) , then it is possible to change the complete dynamics of the ABS and Instrument cluster on the bike. Million dollar question ....... can these Parameters be accessed using Diagnostic Device ?
My Speedo is very accurate in KM ........ the ODO is reading about 60% of the actual distance travelled (ie Miles)
How do you change the ODO from Miles - KM ? Which Parameter needs to be accessed ?
Obviously the BMW Techs have DIAGNOSTIC TOOLS far more sophisticated than a GS911.
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