Hello fellows,

the problem I'm having is VSA light and triangle icon appearing on the dashboard. Sometimes they are on, sometimes off. While on, I can read a fault P1683, which is "Throttle valve not returning to its default/resting position". It is a motor-driven throttle body (drive by wire). I cleaned the plate and the whole unit and so there is no carbon left on the plate and around it. But it didn't help. I removed it's cover by removing the clamps around the unit and removed the safety torx screws and checked the gears and they seem intact. Teeth look as new and well lubricated. No broken or damaged ones... When you manually (with fingers) push the butterfly plate so that the valve opens, it should close by itself when released. And it sometimes does, but sometimes doesn't. There is a bit of resistance, which is normal, since it's driven by the electric motor, but still...kind of feels like too much resistance... it's like the spring inside has lost some of it's original tension or something in that sense... Or maybe the shaft that rotates the butterfly plate uses a bearing, which may have lost its lubricant and so rotates harder than it should. I wonder if anyone else had this kind of a problem and how did you solve it? I would like to disassemble this unit completely to find the main source of the resistance, but I don't want to make it unusable by misplacing some parts... Any thoughts (besides "buy a new one" and "what you are doing is dangerous") ? Thank you in advance

The car is Honda Accord 2.4L, year 2005, bought in EU (it's pretty much the same as TSX 2004-2008 in the US market).

 

Have you thought about finding another OE throttle body from a local junkyard and just replacing yours ? It is not a common failure, so chances are good that a used one will solve your issues... not necessarily the VSA codes... but certainly the throttle body codes.

 

I'll have to do just that if the problem will be coming back... I just thought that maybe someone out there has already had such problem and solved it somehow...