He encontrado esto en ibmw(Internet BMW Riders and Oilhead Riders):
Motronic Fault Codes - Stefan Hegnauer.
Warning!: Although unlikely, it may be possible to screw up the Motronic. I take
no responsibility of any kind if you do so - in other words, it is your risk, and you
are on your own if something fails. If you are not absolutely sure you can handle
this, do not attempt this procedure!
Note 1: There is no connection of the Motronic (diagnostic unit) to any lights
Note 2: This is strictly for R1100R/RS/GS/RT, Motronic 2.2. I have no idea about
the Motronic 2.4 of the R1100S and R1150 family.
1. Get an analogue Voltmeter (digital ones are usually not fast enough, so you
could get wrong readings)
2. Hook it up between pin 1 of the diagnostic connector and ground (battery -,
chassis), switch ignition on (if you don't start or just very briefly turn the engine,
codes 1122 and 1133 will show, which is normal)
3. With a separate wire, connect the same pin 1 to ground for at least 5 seconds,
then remove the wire
4. The needle of the voltmeter should go to nearly zero for about 2.5 seconds,
then rise again to almost 12V
5. A series of short dips towards zero follows - count the number of dips
6. A short pause of 2.5 seconds follows
7. Steps 5 and 6 are repeated 3 times with perhaps different numbers of dips
8. You have now four counts, this is the Motronic diagnostic code (see table
below)
9. The whole sequence, beginning with the 2.5 seconds dip of 4 above, repeats
over and over until prompted again (step 3)
10. The next error code (if any) is shown after prompting
Example: one dip - pause - one dip - pause - two dips - pause – two dips - pause
- long dip - pause (repeat) => code 1122
Motronic Codes
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
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
Notes:
- I remember having seen a code 9 once, but cannot remember to what it
belongs
- ABS can store only one fault at a time
- codes 1 - 4 are latching, i.e. they don't go away automatically once the fault is
fixed
- codes 5 - 9 are self-canceling as soon as the ignition is switched off and on
again ( the fault does not persist!)
- the ABS output signal will need some filtering due to short spikes
Most of the information given above comes from the BMW booklet “BMW
Diagnose - Test Instructions for Antilock Braking System (ABS)”, # 0171 9 798
811 (5.90). The booklet is about the ABS I, but seems to be valid for the ABS II
as well.
LED Fault Code Reader – Henry de Kuijer
You can use an LED to read the fault codes mentioned in the write-up above.
Instead of blips on your meter, you will count LED flashes of light.
Here is the prototype:
http://www.xs4all.nl/~hkuijer/jpg/Motronic/FrameSet.htm
The pictures will give you a good idea of the simple setup. The switch is to hook
pin 1 to ground for 5 sec. to start the diagnostic. The resistor is 2k2, on the high
side, but I don't know what the output of the motronic is. The best is, it works.
Saludos al que llegue hasta aquí.
