K11 Owners Group

[Rolando Montaño]

1993 K1100LT – Throttle position sensor (TPS) – Adjustment

Text extracted and then edited and enriched from several posts sent to the BMW-Tech mailing list in March 2006: BMW-Tech@lists.ibmwr.org Visit: http://www.lists.ibmwr.org/mailman/listinfo/bmw-tech

General comments
• If the problem is fuel, the most likely culprit is a failing or
misadjusted throttle position sensor.
• If it has not been moved, leave it. If you can, avoid moving it
at all.

Preparation
• You MUST have throttle cable free play, from 1-2 mm at all
handlebar positions. (Straight ahead; Left lock; Right lock.)
• Number one cable is on the right hand side of the motorcycle.
Number four is the most external, to the left of the motorcycle.
• A cheap digital multimeter with readings for direct current
Voltage is good enough. (The dial should be in the area indicated by a V for Voltage and a straight line with dots under it that indicates direct current. Milli volts is the range to choose.)
• The easiest way to make the voltage measurement is to peel down
the rubber boot and then slide the multimeter probe tips up from underneath into the holes in the connector.
• Insert the multimeter probes from bellow on the cables at each
end of the connector and leave them in position, with the multimeter dial or screen visible in order to have your hands free, so you can adjust the TPS.
• The TPS adjustment is VERY sensitive. So sensitive in fact that
the two Allen screws need to be barely loose, so when tightened the reading does not again go way wrong. A very small change in the mounting angle of the TPS has a very large effect on the reading

Adjustment
• Hook up the voltmeter to the #1 and #4 (ground) wires of the TPS
connector. (Inner-right and outer-left wires.)
• Measure the voltage with the throttle closed and the ignition
on. The bike doesn't need to be running.
• 0.370Volts between pins 1&4 is correct for a 1993 BMW K1100LT
motorcycle.
• The voltage reading should be between 0.340 and 0.400V DC, with
0.370 being the nominal value.
• Loosen slightly the two retaining Allen bolts.
• Adjust the angle of the TPS until you obtain the correct reading
at the multimeter.
• Re-tighten the TPS.
• Check the reading again.

Alternate “simple” or “rough” adjustment routine
• With the ignition in the “ON” position
• Ground pin 3 of the diagnostics connector. (This is a blue, four
pin connector, “loose” on the left hand side of the motorcycle, under the side cover and usually attached to the frame, close to the TPS.)
• Loosen and rotate the TPS until the coolant temperature
light just barely comes on.
• Tighten the TPS screws.

Other info
• Pin 1 is the output of the low range wiper and the voltage
should max out at something like 1/4 throttle.
• The high range wiper shouldn't max out until the throttle is
pretty much all the way open.

Exhaust analizer
• Having adjusted the TPS, emmissions can be tested, adjusting the
CO POT.
• On the CO%, shoot for 1.5-2.0% at idle with your CO POT.


Dr. Rolando Montaño Fraire
www.ayudamutua.org
rmf@ayuda-mutua.com
Phone/Fax/ (+52) (55) 5689 6659
_________________
Rolando Montaño
rolandomf@gmail.com

[Jim]

Hi Rolando - welcome to the board, and thank you. Hopefully Ted can add your write up to the Tech section on the main forum page.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

[Rolando Montaño]

Thanks. Glad to participate.
_________________
Rolando Montaño
rolandomf@gmail.com

[Kipp K11RS]

Do you know if these approaches work for 94 K100RS as well? Same voltages?
_________________
Kipp
'94 K1100RS
Honeoye Falls, NY

[merlin geikie]

Should this TPS info go into stickies ?

I don't know how good it is but it reads well.

Someone suggested it go there and maybe it will soon be gone,

Just a thought

[Ernie-NH]

Hola Rolando....

Great introductory contribution... and WELCOME !! I have often been to Queretero and Cuautla on business and know there should be some really great rides in your area of the country... hope you will post pics of your Bike as well as rides whenever you can...

Once again WELCOME...!

Best regards.........// Ernie-NH
_________________
AMA,, American Deaf Bikers
Airhead Beemers Club
'11 G650gs
'95 K1100LT
'76 R100/7

[bmwmick]

[tmoons]

Great!!!
there is one small contribution I would like to make..
I have a K1100RS that DOES NOT have a CO adjuster. I have a Oxygen sensor set up (this is standard on later K1100 models.
On these models, the engine managment adjusts the CO level using a tailpipe sensor.