#7 ABS Control Unit Error

[Vincent]

A few weeks ago started getting an ABS error, alt flashing. (98 RT, 93k) Tried reset but came back, after testing found it to be a 7, ABS Control Unit error. Have checked wheel sensors and depth, all within specs. Error does not clear without reset, and has appeared on startup and in the middle of a ride. Before I think about switching the control unit, has anyone had any similar problems and found it to be something other than the control unit?

[philbytx]

Vincent,

Anton has a handy article on ABS resets and fault codes HERE.

[BFG]

I had a similar problem last summer. As I would move off the ABS would cycle with a louder "clack" and then the fault lights would flash. Everything checked out ok, except the ABS controller. Having never bled the thing, (70,000 miles) following internet advice that a normal brake flush also flushes the ABS controller, I lifted the gas tank and bled it. I got about 3 inches of dark goo pumped into the drain tubing. Not good. I then read somewhere about a guy who tore apart his old ABS controller, having replaced it. Inside are two pistons that have to fall and that's what makes that familiar "chink" cycle-up sound. This spring I got the bike out for a test and it still faulted but made a better sound. I also read that you can coax those pistons to fall if you hit the brakes right when the ABS cycles-up. I did that a few times and it worked! I figure the pistons were stuck but now things are flowing. Everything is now back to normal. That was 3000 miles ago so I think it's cured. Lesson learned...flush the brakes and the ABS controller.

[Vincent]

I've changed fluid annually since the bike was new in 1997, and have flushed from the controller. Looks like it is the control unit. Just wanted to see if anyone had #7 faults that ended up being something else before I dive into it. THANKS!!!