B
broadstone
Guest
1992 K75s ABS issues
I've taken my/our quest a bit further trying to diagnose my ABS problems. A summary of this process is:
1. Initially, when the ignition was turned on, ABS light came on and stayed on.
2. I reset the ABS using the wire to the center terminal of the diagnostic plug method.
3. Reset worked to the extent that now, when I turn on the ignition, the ABS light flashes and activating the brakes turns off the bulb monitoring light. But, in riding the bike, the ABS light continues to flash.
4. I tried determining where the problem is counting the diagnostic code blips using a digital voltmeter. In doing this test multiple times I didn't get completely consistent counts but mostly code #6 indicating a defective relay or low battery, if my count is accurate.
5. I checked the battery again and found the voltage to be 12.8V.
6. The tank is not off but, when I turn the ignition on I do hear a click indicating that at least some relay is activating.
7. I found a great write up by Milky Way Technology Japan which described the diagnosis further; their article said that when the ignition is turned on, within 5 seconds there will be a sound "like a mosquito" from the rear brake modulator. I hear no sound of any kind.
I am not sure that my diagnostic code blip count is accurate not being sure where the first blip starts because it looks to me like the first one is immediate. If I wait for the first voltage drop after the first voltage reading is displayed, then the count would be 5 instead of 6 indicating low voltage which I know is not the case.
One of my concerns regarding this procedure is, what would be an indicator of no measurable faults. Would the count continue to 9 blips? Also, although no code indicates a gap problem between the sensor and the counter ring, and i really don't know how the sensor reads the speed, mine are rusty and I'm wondering whether this could affect the diagnosis.
I could just turn off the ABS and I will, I suppose, if the fix looks like it will get very expensive but I've had 3 other BMW's with ABS and one with iABS. Because I live in south Florida where rain is common, and because I'm not a fair weather rider, I really want the ABS working. Any suggestions will be appreciated. Jim
I've taken my/our quest a bit further trying to diagnose my ABS problems. A summary of this process is:
1. Initially, when the ignition was turned on, ABS light came on and stayed on.
2. I reset the ABS using the wire to the center terminal of the diagnostic plug method.
3. Reset worked to the extent that now, when I turn on the ignition, the ABS light flashes and activating the brakes turns off the bulb monitoring light. But, in riding the bike, the ABS light continues to flash.
4. I tried determining where the problem is counting the diagnostic code blips using a digital voltmeter. In doing this test multiple times I didn't get completely consistent counts but mostly code #6 indicating a defective relay or low battery, if my count is accurate.
5. I checked the battery again and found the voltage to be 12.8V.
6. The tank is not off but, when I turn the ignition on I do hear a click indicating that at least some relay is activating.
7. I found a great write up by Milky Way Technology Japan which described the diagnosis further; their article said that when the ignition is turned on, within 5 seconds there will be a sound "like a mosquito" from the rear brake modulator. I hear no sound of any kind.
I am not sure that my diagnostic code blip count is accurate not being sure where the first blip starts because it looks to me like the first one is immediate. If I wait for the first voltage drop after the first voltage reading is displayed, then the count would be 5 instead of 6 indicating low voltage which I know is not the case.
One of my concerns regarding this procedure is, what would be an indicator of no measurable faults. Would the count continue to 9 blips? Also, although no code indicates a gap problem between the sensor and the counter ring, and i really don't know how the sensor reads the speed, mine are rusty and I'm wondering whether this could affect the diagnosis.
I could just turn off the ABS and I will, I suppose, if the fix looks like it will get very expensive but I've had 3 other BMW's with ABS and one with iABS. Because I live in south Florida where rain is common, and because I'm not a fair weather rider, I really want the ABS working. Any suggestions will be appreciated. Jim