Subject	The VTC is controlled by five sensor input variables
Posted by	LitlElvis on September 27, 2009 at 11:00 AM
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In Reply To	I was hoping you'd see this. posted by black300zx on September 27, 2009 at 08:33 AM
Message	which feed into the ECU (see below). Its operation is dependent upon a combination of either one, a couple, or all inputs to trigger it; as far as I know, no one has publicly admitted to figuring out the algorithm used by the ECU to control it. I need to make this a project someday. Your situation where disconnecting the solenoids eliminates your noise may be that you have found a threshold of inputs to the ECU programming where the VTC is cycling on and off in an uncontrolled manner and creating the noise you describe. Or, It may be that one or more of the five sensors is malfunctioning and creating a loophole for this scenario to occur. Regardless, because of all the variables used to control the VTC, I don't think it's safe to assume the VTC solenoids will always be 100% energized under this particular situation.
Follow Ups	Unusual VTC rattling - black300zx 08:59:00 09/25/09 Have you replaced the VTC springs? (n/m) - de944 12:54:28 09/25/09 Yes. They were replaced along with all the other 120k parts (n/m) - black300zx 13:07:07 09/25/09 There are so many misconceptions about the VTC... - LitlElvis 11:33:28 09/26/09 I was hoping you'd see this. - black300zx 08:33:42 09/27/09 The VTC is controlled by five sensor input variables - LitlElvis 11:00:14 09/27/09 Thanks! I must have missed that diagram in the FSM. - black300zx 14:26:06 09/27/09
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