73
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.
Analog Fault Code Reader – Rob Lentini
I finally got around to trying this out, and it works perfectly. Without turning or
starting the engine, I first got 1133. Then I reset per step 3 and got 1122. Final
reset and I got 0000, just as I should have.
If I did the procedure with the engine running, I got 4444 right from the get go.
I used a Fluke 79 DVM which has a fast-acting analog bar at the bottom of the
display.
In fact, it was so easy that I will start performing this on any bike I work on.
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