Hi Jussi, I think the ATV voltage is that applied by the TPS to the ECU. The Yamaha Technical note specifies a setting of between 0.625v and 0.630v at 1000 RPM.
If this fails to cure the problem they then suggest 0.620v. The TPS is maddeningly sensitive to movement, and you will change the ATV voltage just by loosening and tightening the TPS adjustment screws. I gave up at 0.622v. To make probing easier, I had the ECU out of its metal box and wired backup to the bike so that I could probe for the required voltage. Yamaha have helpfully labelled the PCB with all the signal names so it's easy to see the line you need to probe. If you are looking at the ECU with the larger connector on the left and the smaller connector on the right, then the ATV signal is on the smaller connector, top row, 3rd in from the left. However it's MUCH easier (though time consuming) to whip off the ECU cover and probe the signal from the back of the socket. Regards, David -----Original Message----- From: Jussi Kangas [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 28, 2002 7:52 AM To: [EMAIL PROTECTED] Subject: Re: Surging Blah Blah Blah Interesting indeed - if it really helped. May be "simple" to ask, but what is meant with "ATV -voltage"? (I still don't have a service manual..) BTW, my GTS -93 doesn't suffer enormous surging that badly, but it's definately difficult to maintain constant, light torque when not really loading the engine (low speed cruising..) chak-chak-chak.... With best Regards, Jussi Kangas Finland GTS-1000@LISTSERV .UGA.EDU To: [EMAIL PROTECTED] cc: 28.05.2002 01:15 Subject: Surging Blah Blah Blah Please respond to GTS-1000 Guys, I have been thinking about chopping in my GTS for something newer, smoother, lighter and yes faster. Got her 1st MOT today, so I spent about an hour sitting on Blackbirds, Futuras and a sweet little R1100S. Now I know that the BB will be faster, the Futura is so light and the BMW will last forever, but none of them quite have the all encompassing riding experience of the GTS. The BB will get me nicked, the Futura will cost a fortune to fix and the BMW is crampt. However until 8pm this evening all the above held one thing over my beloved GTS. None of them surged..! Now on Saturday, David Jerome sent me the Surge fix that Yamaha published in 1994. The "set your ATV voltage to 0.620v." Took 2 hrs to remove the fairings, play with the ECU and TPS and then put it all back together. Now she ain't perfect..3.2K rpm in 1st gear still yields a shimmy. But damn, I can hold a constant speed in 2nd or 3rd below 5Krpm, and my right hero blob proves it. We just kept going round and round and round, lower and lower, hee hee hee. Hope to bugger of the France very soon, now I can enjoy the GTS once more. Regards, David ________________________________________________________________________ This email has been scanned for all viruses by the MessageLabs SkyScan service. For more information on a proactive anti-virus service working around the clock, around the globe, visit http://www.messagelabs.com ________________________________________________________________________
