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BexarWolf
Big Brick Rider
Joined: 21 Aug 2012
Posts: 65
Location: Central Texas (almost Austin but far enough away)
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 Posted: Mon Sep 24, 2012 7:03 pm Post subject: Weird ABS Behavior |
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Normally when I take off on the bike, I can feel the ABS 'clunks' within 15' of taking off. Now, this is in the afternoons or late evenings after the bike has been on a trickle charger all day long (this leads up to what I think the issue is so stick with me).
Lately, since the temps have cooled off, I'm experiencing something a little different when I leave work. I crank up the bike, let it warm up for a couple of minutes while I put my gloves on and take off. I can go as much as 1/2 a block and still no 'clunks'. I pull over, shut off the bike, restart and get the 'clunks' within 15' again.
Now to what I suspect: Low battery? My assumption is that taking off after pulling the trickle charger, the battery is full. After sitting at work overnight (I work night shifts) with no trickle charge and the cooler temps, my battery drains just enough to keep the ABS from doing its self-check and after going the 1/2 block, it's brought the battery back up just enough to make the self-check possible.
Am I on the right track?
_________________
1994 K1100RS
"Sit tall in the saddle, hold your head up high. Keep your eyes fixed where the trail meets the sky. Live like you ain't afraid to die. Don't be scared, just enjoy your ride" ~ Chris LeDoux |
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SugarHillCTD
Site Admin
Joined: 10 Oct 2007
Posts: 4238
Location: Now in Eastern Pennsylvania
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| Posted: Mon Sep 24, 2012 7:46 pm Post subject: |
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That could be one possible explanation.
But welcome to the wild and wacky world of K bike ABS. Starting the bike every day may bring a new ABS surprise.
On my last K-RS, the ABS would not reset after having a fault. Tried numerous times- #2 pin to ground, hold down ABS rocker switch then ignition on. Then tried #2 pin to ground, switch ignition on then hold down ABS rocker. LOT of tries. No good.
Finally covered the ABS light show with some electrical tape. Rode the bike for a few weeks like that. One day I happened to look at the gauges at an angle and the ABS lights were off. The bike had reset itself.  What the???
Good luck with yours.
John
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John & Cathy
'92 K100RS4V Pearl White SOLD
'04 K1200GT
IBA Several-SS1k, BBG, 50CC NYC to S.F. |
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Number 6
Flying Brick Rider
Joined: 05 Feb 2011
Posts: 481
Location: Paris area, France
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| Posted: Mon Sep 24, 2012 8:28 pm Post subject: |
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When the voltage drops too much (when cranking), the ABS won't start, I've experienced it especially with gel batteries. Then if you turn off the engine and restart especially if you restart without the starter, you'll be fine though ABS 2 will restart only at a low speed.
I know some guys install a relay so that ABS is turned off during cranking and thus does not see the voltage drop.
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I am not a number, I am a free man.
94 K1100LT |
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BexarWolf
Big Brick Rider
Joined: 21 Aug 2012
Posts: 65
Location: Central Texas (almost Austin but far enough away)
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| Posted: Mon Sep 24, 2012 8:42 pm Post subject: |
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| Number 6 wrote: | When the voltage drops too much (when cranking), the ABS won't start, I've experienced it especially with gel batteries. Then if you turn off the engine and restart especially if you restart without the starter, you'll be fine though ABS 2 will restart only at a low speed.
I know some guys install a relay so that ABS is turned off during cranking and thus does not see the voltage drop. |
Interesting info. I still use the starter for the 2nd restart but I can see where the voltage drop comes into play. A relay sounds like a solution but I think what I'll do first is get the battery load-checked and replace if necessary. If that's not it, I'll just go with the 'drive a bit restart'. I hate doing electrical work on a vehicle. I'm not an electrical guru and usually end up screwing something up. 
_________________
1994 K1100RS
"Sit tall in the saddle, hold your head up high. Keep your eyes fixed where the trail meets the sky. Live like you ain't afraid to die. Don't be scared, just enjoy your ride" ~ Chris LeDoux |
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Number 6
Flying Brick Rider
Joined: 05 Feb 2011
Posts: 481
Location: Paris area, France
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| Posted: Mon Sep 24, 2012 8:43 pm Post subject: |
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| BexarWolf wrote: | | Number 6 wrote: | When the voltage drops too much (when cranking), the ABS won't start, I've experienced it especially with gel batteries. Then if you turn off the engine and restart especially if you restart without the starter, you'll be fine though ABS 2 will restart only at a low speed.
I know some guys install a relay so that ABS is turned off during cranking and thus does not see the voltage drop. |
Interesting info. I still use the starter for the 2nd restart but I can see where the voltage drop comes into play. A relay sounds like a solution but I think what I'll do first is get the battery load-checked and replace if necessary. If that's not it, I'll just go with the 'drive a bit restart'. I hate doing electrical work on a vehicle. I'm not an electrical guru and usually end up screwing something up. |
If you have a gel battery, it may be brand new and still have the same issue.
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I am not a number, I am a free man.
94 K1100LT |
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BexarWolf
Big Brick Rider
Joined: 21 Aug 2012
Posts: 65
Location: Central Texas (almost Austin but far enough away)
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| Posted: Mon Sep 24, 2012 9:06 pm Post subject: |
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I don't *think* it's a gel but I'll check it out. I'll get it out and get it tested one day later this week.
_________________
1994 K1100RS
"Sit tall in the saddle, hold your head up high. Keep your eyes fixed where the trail meets the sky. Live like you ain't afraid to die. Don't be scared, just enjoy your ride" ~ Chris LeDoux |
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Number 6
Flying Brick Rider
Joined: 05 Feb 2011
Posts: 481
Location: Paris area, France
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| Posted: Mon Sep 24, 2012 9:09 pm Post subject: |
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It's mostly an issue when it's cold, with a good battery in Texas it shouldn't be 
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I am not a number, I am a free man.
94 K1100LT |
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Tyronewildman
Joined: 16 May 2012
Posts: 24
Location: Tyrone, Georgia USA
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| Posted: Mon Sep 24, 2012 11:32 pm Post subject: Wait, The "Clunk" I Hear When 1st Taking Off Is Th |
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I'm new to BMW & I didn't know what the "clunk" was but though it was just the pads resetting from backing out of the garage. I've done a search & didn't find any info on proper ABS II operation. Mine had set, before buying it, for almost 2 years & a new battery and a ABS "reset" and it has worked fine for the 2k mi I have put on it in a few months. Please tell us what causes the ABS "clunk" and why. Thanks, De 
_________________
'13 FJR Yamaha
'09 Road King
'07 Buell P3 Blast
'02 Buell S3T
'94 K1100LT ABS BMW
'94 GL1500 Honda
'89 PC800 Honda
'77 T140V Triumph
'69 441 Victor Special BSA
'69 CT90 Honda
"It Doesn't Have To Make Sense" |
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Number 6
Flying Brick Rider
Joined: 05 Feb 2011
Posts: 481
Location: Paris area, France
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| Posted: Mon Sep 24, 2012 11:36 pm Post subject: |
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It is a relay that sets to on once the computer finds that the bike is over a certain speed threshold and everything is fine, then the blinking lights goes off. If there is a problem, both light blink alternately (instead of at the same time when you start the bike).
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I am not a number, I am a free man.
94 K1100LT |
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Tim (Midland Section)
Flying Brick Rider
Joined: 08 Apr 2005
Posts: 960
Location: Pinxton, Nottingham, England.
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| Posted: Thu Sep 27, 2012 7:18 pm Post subject: |
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| Number 6 wrote: | | It is a relay that sets to on once the computer finds that the bike is over a certain speed threshold and everything is fine, then the blinking lights goes off. If there is a problem, both light blink alternately (instead of at the same time when you start the bike). |
Not quite, I treat the "clunk" as a re-assurance. Once the ABS computer has sucessfully checked, in no particular order, both sensors, pulses from same, computer & battery voltage, lastly the ABS motor (which "clunks") It reports OK & extinguishes the lamps.
BTW, I've always had a Gel battery & only if I've left something sucking juice, has it flashed at start up.
Check battery, it's connections & the earth (ground) strap. The low volt flashing is more common on pre 1995 bikes (ABS1 lumps on the sides). It was addressed with ABS2 which had a smaller 19AH battery..
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Regards Tim,
Grey haired riders don't get that way by pure luck
1996 Guzzi Cali3 LAPD
1972 750 Commando
G6HRN
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Tyronewildman
Joined: 16 May 2012
Posts: 24
Location: Tyrone, Georgia USA
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| Posted: Sat Sep 29, 2012 10:38 am Post subject: This time it makes sense |
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| Number 6 wrote: | | It is a relay that sets to on once the computer finds that the bike is over a certain speed threshold and everything is fine, then the blinking lights goes off. If there is a problem, both light blink alternately (instead of at the same time when you start the bike). |
Thanks, #6
_________________
'13 FJR Yamaha
'09 Road King
'07 Buell P3 Blast
'02 Buell S3T
'94 K1100LT ABS BMW
'94 GL1500 Honda
'89 PC800 Honda
'77 T140V Triumph
'69 441 Victor Special BSA
'69 CT90 Honda
"It Doesn't Have To Make Sense" |
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BexarWolf
Big Brick Rider
Joined: 21 Aug 2012
Posts: 65
Location: Central Texas (almost Austin but far enough away)
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| Posted: Sat Sep 29, 2012 4:19 pm Post subject: |
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| Tim (Midland Section) wrote: | | Number 6 wrote: | | It is a relay that sets to on once the computer finds that the bike is over a certain speed threshold and everything is fine, then the blinking lights goes off. If there is a problem, both light blink alternately (instead of at the same time when you start the bike). |
Not quite, I treat the "clunk" as a re-assurance. Once the ABS computer has sucessfully checked, in no particular order, both sensors, pulses from same, computer & battery voltage, lastly the ABS motor (which "clunks") It reports OK & extinguishes the lamps.
BTW, I've always had a Gel battery & only if I've left something sucking juice, has it flashed at start up.
Check battery, it's connections & the earth (ground) strap. The low volt flashing is more common on pre 1995 bikes (ABS1 lumps on the sides). It was addressed with ABS2 which had a smaller 19AH battery.. |
Well, that's the weird thing.....I've never had an indication of low volt, just the failure to set on the ABS until I travel a few feet, turn it off and restart.
I'll pull the battery out one day next week to get it tested. 
_________________
1994 K1100RS
"Sit tall in the saddle, hold your head up high. Keep your eyes fixed where the trail meets the sky. Live like you ain't afraid to die. Don't be scared, just enjoy your ride" ~ Chris LeDoux |
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