"NO WHiZZING" !!
I have been working on my 04 RT for the last three weekends doing a lot of maintenance that has been long overdue, plus a surprise replacement of the left side throttle body, which was not in the plans (butterfly valve was broke). Removed and cleaned out fuel tank, new fuel filter, replaced O2 sensor, adjusted valves, new battery, replaced fluids, new plugs, and the scary-hell of trying to get a stuck K&N oil filter off ! (it has a smooth body, no ridges to work with and the nut almost stripped)
Today, the engine was finally running smoothly enough to take a test ride around the block...However...when I was slowly riding down the street, the ABS light was still flashing, it never set itself or went off. I'd squeeze the brakes, and no power to them. Stopped and depressed both brakes, noticed I wasn't hearing that "whizzing" sound? Turned motor off, left electrical on, still no whizzy sound as I depressed on the brakes, which is what I "used to hear" on this RT.
My friend and I started going over the bike, suspecting maybe something electrical got either disconnected or "broke". Checked fuses, relays, wiring under the tank, etc. Never found anything obviously wrong? Few more test starts of the bike, but ABS just keeps flashing away, but system never kicked in.
I do not know the full details of how this system works, but the current "guess" is that something is not allowing the "whizzer" motor to function? Perhaps it has seized up or other issue I'm not aware of?
This bike has not been ridden for almost a year now. It got parked around the end of May of last year and hasn't been run since. Part of the problems I have noticed while working on the RT were moisture accumulation/build-up issues. I live about 100 miles NW of Houston and its humid most of the year around here. Had signs of water in the oil, about a quart in the fuel tank and in the transmission fluid when I drained it the last two weekends.
I am wondering if moisture got built-up in the ABS unit and either siezed up the "wizzer" unit or other issues?
At this point, I really do not know what direction to go to next with this new problem?
Any input will be greatly appreciated.
The whizzy booster is controlled by the Moronic computer; telling the computer to activate the ABS starts with the wiring from the brakes.
The front brake wires are:
Green with a black runner at the brake lever - this becomes white and blue after the first harness connector; this goes to pin 40 of the computer connector.
Gray - this becomes white with a yellow runner after the harness connector; this goes to pin 39 of the computer.
The rear brake wires are:
Yellow at the foot lever - this becomes yellow and green after the harness connector; this goes to pin 41 of the computer connector.
Green/Black - this becomes yellow/black after the harness connector; this goes to pin 7 of the computer.
The front & rear are on different lines, so if this happens (actually, "doesn't happen") with either brake Firmly depressed, then the computer becomes the first suspect. Carefully disconnect that big main connector and inspect the pins for straightness & alignment, water, and corrosion; some WD-40 and a careful nylon scrub pad may help here.
Does the brake light come on with either brake applied? That will tell you if the computer is receiving the control line input. This is a famous (or infamous) fake-you-out spot: if you have a bad bulb or socket, the computer will change the voltage to - and thus your observation of - the brake light. Make sure both bulbs are actually good and operating "properly".
Possibly relay #7 or fuse #5 (Motronic control circuits) are bad.
I don't know if the ABS pumps can be electrically tested independently, but if this applies to both front & rear, that points back to the computer or a harness/connector issue.
Good luck with your next whiz!
Some Direction Finally
Thanks for the input...hopefully I will find out I have "no" input to the computer and it will be an easy fix. There was some concern about the rear brake light while fiddle-faddling through all of it. The micro switch on the rear brake was physically removed while I had that right side plate off. Then mounted back on and I can hear the micro-switch "clicking" with the brake pedal actuated. Will do some other tests with your suggestions.
It will be this weekend before I get back on that project. This is the irritating part, I now work in Houston, but the RT is up in Bryan, Texas, about 100 miles away. I don't have a work space, so its up at a friends house in Bryan for now. Only gives me a few hours on Saturdays & Sundays to work on it. Hopefully I can resolve this issue without further fanfare of surprises.
Dead RT...et al...
Just something else to consider is the strength of the battery. If the battery voltage is low the ABS lights will flash.
True ... but will a low battery also cause No Whizzy sound?
This project including putting in a new battery two weekends ago and its been kept on a Battery-Tender while parked. Have checked it with a voltmeter also, that thought crossed my mind as well. Will chase down the wiring, bulbs this Saturday when I get back. Then again, may just parked this another week and rebuild some carbs on the other upcoming project...no whizzy unit on that bike !
Originally Posted by MCrenshaw
Have one bike left running at the moment....will start off with a breakfast ride Saturday Morning - get my priorities straight
"will start off with a breakfast ride Saturday Morning - get my priorities straight "
Well you definitely have your priorities straight! Still lots of pretty bluebonnets in your area, I rode through BCS last Tuesday. You mention that the bike had been parked for a year and there were signs of moisture accumulation. Have you cleaned all of the possible wiring connections? It's an onerous task, but one that is necessary on occasion. I'll be interested in hearing what you find. Just acquired a 2004 R1150GSA with whizzy brakes and it's a new system to me.