- Incomplete notes -
Notes from firstname.lastname@example.org
Note: there is no connection of the Motronic (diagnostic unit) to any lights on the R1100, but is for the K1100.
* if you don't start or just very briefly turn the engine, codes 1122 and 1133 will show, which is normal!
example: one dip - pause - one dip - pause - two dips - pause - two dips - pause - long dip - pause (repeat) => code 1122
0000 no further fault stored
1111 CO potentiometer
1122 Hall signal 1
1133 Hall signal 2
1215 Throttle butterfly angle sensor
1223 Engine temperature sensor
1224 Air temperature sensor
2341 Oxygen sensor at limit
2342 Oxygen sensor signal invalid
2343 mixture setting at limit
2344 Oxygen sensor shorted to ground
2345 Oxygen sensor shorted to 12V
4444 no fault stored
Erase fault memory: pull fuse 5 for some 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.
We can do a quick check of the TPS setting on Motronic 2.2 (and I think 2.1) using the 3 position diagnostic connector. I've tested this on my '96 R1100RT and it works. I'll check my '93 K1100LT (MA 2.1) one of these days and let you know but I'm pretty sure it works the same and in addition, it lights the TEMP lamp so you don't even need the LED.
Ground Pin #3
LED + on Battery + terminal
LED - on Pin #1
Now you should see the LED lit. Slightly opening the throttle should make the LED go out. If so, your TPS is within factory range.
Apparently one can use pin 18 in the diagnostic connector the same way one could use pin #1 on the old 3-pin flat connector (per Paul, in Holland). Haven't tried it myself. 2.4 bikes have many more diagnistic functions than 2.2 had, so any information you get from pin #18 will only be a small part of what can be seen with a MoDiTeC or a GT1.
Very early '94 models had only one map in the ECU and no CCP. Disconnect the O2 sensor and plug in the pot.
Later '94 models had the CCP. If you pull the CCP with the O2 still installed, it will go to "limp home" mode, but pulling it with the O2 disconnected makes it look for the pot.
Models after 94 may need a "No O2" CCP to tell the Motronic to look at the pot. Again, pulling the CCP sends the ECU into limp mode.