BMW R850 Maintenance Manual page 72

To erase fault memory: pull fuse 5 for a few seconds.
Most of the information given above comes from the BMW booklet "BMW
Diagnose - Test Instructions Motronic", # 01 71 9 789 901. This booklet is about
the K1100 but seems to be valid for the R1100 as well, at least in part.
One can get additional information for both Motronic and ABS - again, strictly for
the R1100 series with Motronic 2.2 and ABS II. Usual disclaimers apply.
Motronic Throttle Position Setting:
- same setup as for Motronic error codes (i.e. voltmeter or high impedance test
light on pin 1 of the diagnostic connector)
- switch ignition on
- connect pin 3 to ground and keep it grounded
- if the TPS is set correctly the voltage should read about 0V (check by twisting
the throttle slightly open - the voltage should rise to about 12V)
- rotate the pot if needed, recheck
- remove ground from pin 3
Note: make sure the 'choke' lever is not in action
ABS II:
- voltmeter on pin 2
- turn ignition on
- meter will indicate about 11V steady with no faults stored
- count eventual dips towards zero volts
- fix the cause of the fault and cancel code
ABS II Codes:
1 front pressure modulator
2 rear pressure modulator
3 front sensor
4 rear sensor
5 battery voltage low
6 ABS relay
7 ABS control unit
8 sensor gap front or rear
ABS II Canceling Error Codes:
this has been reported before. Just for reference:
- ground pin 2
- switch ignition on
- push ABS button for at least 8 seconds
- release ABS button
- switch ignition off and remove ground from pin 2
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