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, Thu, 29 Apr 2004 08:51:49
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Anders-
I really would like to be able to work towards a good FAQ or something so that people can get to the bottom of TCS problems without spending all their time doing research, and I welcome your opinion and feedback on any of the advice I give. I regard you as the TCS expert-- but those of us far away don't have access to your services, and if we can get the problem isolated before we go to the mechanic, we can be much better off.
This is what I was going to post:
Anders is quite right. I should have said that myself-- If you are already in limp home, those communications measurements are probably going to be wrong _because_ you're in limp home. Also, as I said, my cars can be pretty far off even when everything works.
It's also absolutely true that if you've got the ISAT or TECHII tool, you will get to the bottom of things a lot faster. As he points out, the only checks you can do with ordinary tools are the ones listed under "ETS (Electronic Throttle Control) Pin Checks" on the townsend site. The others require the breakout boxes.
Still, I guess the reason I keep posting about this stuff is that I think a lot of people are spending time looking at really esoteric stuff and getting sidetracked. As Anders points out, it seems to come down to a few parts that go bad regularly. If you know how to check for a bad throttle and a bad bleed valve, you'll probably find that it's one or the other. If it's neither, get your mechanic to pull codes and recalibrate. Maybe the recalibration will cure things. Also, recognize that you need to test for defective components when you are in limp home-- if you're not in limp home, they're working! Finally recognize that limp home mode will cause other things to stop working, and try to differentiate between the problem that caused limp home and the problem caused by limp home.
It sounds like you might be where I was- you've got a measurement telling you that the throttle is bad, but you want it to be something cheaper.
Do you agree with all this, Anders? So many people seem to spend so much time chasing these problems, and I'm trying to really get my head around what the shadetree mechanic can do most effectively so that we can give better advise. I've been posting a lot about this, always with the hope that if I say something that's wrong someone will correct me-- I'm not interested in being some kind of expert, I'm interested in people getting their cars working. So if anyone has advice, please join in.
I also realized that there may not be any specs at Townsend for what the voltage feeding the throttle should be. At least, I couldn't find it just now. I think I checked that by looking at the diagram for where to check and then checking both of my 9000's to make sure they were the same.
posted by 130.91.5...
, Thu, 29 Apr 2004 08:51:49, Thu, 29 Apr 2004 18:23:08, Thu, 29 Apr 2004 20:42:38, Thu, 29 Apr 2004 13:14:31
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