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K1100LT 1994 ABS faults all the damn time Thu Aug 29, 2019 3:28 pm
StefanMajonez
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I wrote this post before.
So, a month ago I bought a brand spanking new lead acid battery, and literally nothing changed.
The brand new battery holds 12.6 volts in the morning. The moment the engine starts and is on idle, it jumps to 13, the moment I even slightly touch the accelerator it jumps up to 13.5 or 13.7. within roughly 5 minutes of riding the voltage slowly raises to 14 volts, and is at 13.4 at idle RPM.
In the morning I usually clear the ABS fault from the day before (if it's not cleared already) and start my bike. It calibrates perfectly fine, and the ABS works flawlessly. After 10-15 minutes of riding it calibrates again, and it does so without fault. After roughly 35-50 minutes of riding, the fault appears.
The fault shows up on average once a day - most days it happens once (on my way home), some days it works flawlessly, some days the fault shows up twice (on my way to work, and back home). I usually try restarting the fucker anywhere from 2 to 5 times, and each time the moment the wheels start spinning the fault shows up again. If I really need ABS and don't mind being extremely late, I park the bike for 20-30 minutes to cool down, and the fault usually clears, but sometimes (like 15-20% of cases) still persists. But, if it appears in the morning, it always successfully clears the error and calibrates after I leave work 8 hours later. Like I said in my previous post, engine temperature doesn't matter - I can leave the bike stationary with the engine running until the fan kicks on, or I can ride at constant speed cooling the engine, the ABS will fault after 35-50 minutes regardless.
It's always either a 6 (battery) or a 7(brain) error, although 7 shows up slightly more often, probably a 70/30 split.
I've tried electrical contact cleaner on the Motronic multi-pin connector, and then wiggling it around, with mixed results - sometimes it helps for 2-3 days, sometimes it does absolutely nothing. I tried cleaning every pin, once with a toothbrush, and once with high grit sandpaper, and it made absolutely no change whatsoever.
I'm not sure what to do next.
So, a month ago I bought a brand spanking new lead acid battery, and literally nothing changed.
The brand new battery holds 12.6 volts in the morning. The moment the engine starts and is on idle, it jumps to 13, the moment I even slightly touch the accelerator it jumps up to 13.5 or 13.7. within roughly 5 minutes of riding the voltage slowly raises to 14 volts, and is at 13.4 at idle RPM.
In the morning I usually clear the ABS fault from the day before (if it's not cleared already) and start my bike. It calibrates perfectly fine, and the ABS works flawlessly. After 10-15 minutes of riding it calibrates again, and it does so without fault. After roughly 35-50 minutes of riding, the fault appears.
The fault shows up on average once a day - most days it happens once (on my way home), some days it works flawlessly, some days the fault shows up twice (on my way to work, and back home). I usually try restarting the fucker anywhere from 2 to 5 times, and each time the moment the wheels start spinning the fault shows up again. If I really need ABS and don't mind being extremely late, I park the bike for 20-30 minutes to cool down, and the fault usually clears, but sometimes (like 15-20% of cases) still persists. But, if it appears in the morning, it always successfully clears the error and calibrates after I leave work 8 hours later. Like I said in my previous post, engine temperature doesn't matter - I can leave the bike stationary with the engine running until the fan kicks on, or I can ride at constant speed cooling the engine, the ABS will fault after 35-50 minutes regardless.
It's always either a 6 (battery) or a 7(brain) error, although 7 shows up slightly more often, probably a 70/30 split.
I've tried electrical contact cleaner on the Motronic multi-pin connector, and then wiggling it around, with mixed results - sometimes it helps for 2-3 days, sometimes it does absolutely nothing. I tried cleaning every pin, once with a toothbrush, and once with high grit sandpaper, and it made absolutely no change whatsoever.
I'm not sure what to do next.
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1994 - BMW K1100LT
Dyno results 2017
Previous bike:
1989 Honda CB450S