Thiis is my first post so please bare with me. I tried the search deal and didnt come up with much. I ran my Z off the road a couple of months ago and ever sense my VCT has not been kicking in. I'm a mechanic so I know my way around a car but theres just not alot of information on how the system works. I know it uses oil pressure to adv the timming but also voltage to the soleniod from the ECM. I ve let the car idle and used my power prob to jump each soleniod and both seem to make a difference in the idle so they must still work. I just cant figure out how the ECM knows when to turn them on by oil pressure with there only being one oil press sensor. Any help understanding this system and were would be a good place to start looking would be greatly app. Sorry in advance if there is already a post on this and im mostly a diesel mechanic I usually only work on gas when we dont have any trucks in the shop. Thanks

 

All theseZdrivers and know one has any info. It wouldn't be a big deal if some lady wouldn't have crushed my 09 titan while bringing my 2 year old son to school. This was supposed to be my project car. Not my every day driver. So when you take the little bit of fun power(non turbo VCT is all us NA guys get) its almost like a kick in the *****. I used to be able to play with some of these guys. Now its kind of like just act like you don't see them. This sucks even shop key doesn't really give you a good dig tree much less any help from IATN. So with all you Z drivers I know yall have to know something to own a Z. Just looking for a little help. 90 NA manual headers gutted cats Z1 one piece drive shaft all new injectors(problem started long after injectors were replaced) and a couple other little bull sh*t things. Just need a little insite.

 

Click (1st Google result):

http://z32.wikispaces.com/Variable+Timing+Control

Non-Turbo
For the VTC to turn on, the following conditions must be true:

Temperature between -58°F and 230°F.
Vehicle speed 6 MPH or higher (0 MPH on some earlier ECUs)

Then, the ECU will enable the VTC if the RPM is between 1800 RPM and 5800 RPM. If the RPM is below the range, it will enable as soon as the TP (the calculated engine load) is above 39ms.



Have you downloaded the free FSM yet? www.xenonz32.com/reference

 

thanks for the help dude good info