2zz Toyota Engine SyncState Issue | AEM
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shuetuning
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2zz Toyota Engine SyncState Issue

Hi,

 

I am working on a 2zz that has just had an Infinity installed.  Right off the bat I am having issues with using the 2jz VVTI trigger pattern.  For some reason while cranking it is not achieving a "1" for SyncState.  From what I can tell the crank and cam durations look correct showing the 36-2 crank and 4-1 cam signals.  Scope captures of both looked correct as well. 

 

Does the 2zz have the missing cam tooth occuring at a different time than the 2jz vvti engine does causing a lack of sync?  I have attached a picture of what I get in the logger while cranking.

 

Thanks for any help on this!

 

-Matt

 

AEM_NS
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Joined: 06/06/2014 - 09:31
Quote: Does the 2zz have the

Quote:
Does the 2zz have the missing cam tooth occuring at a different time than the 2jz vvti engine does causing a lack of sync?

Not sure if you're asking if the missing cam tooth is different between the 2JZ VVTI and the 2ZZ or if you know they're different and are wondering if that's why it's not syncing.  If it's the former, we don't have any way of knowing that unfortunately.  If it's the latter, then yes, the patterns being different will definitely cause a no sync condition.  Simply having the same number of teeth isn't what makes a particular timing pattern.  It's when the teeth occur relative to each other.  If they're not the same, it's not going to sync.

You might want to consider running semi-sequential off the crank trigger only for the time being.  Or change the intake cam to have a single tooth and run the universal 36-2 with single tooth cam.

BTW please read this: http://aemelectronics.com/?q=forum/infinity-troubleshooting-posting-standards-read-me  

shuetuning
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I am sorry about the lack of

I am sorry about the lack of a log and session file.  I will try to get them sent over later today when I have time.  I would like to know based on the pic if the missing tooth on the cam is in the same relative spot in relation to the missing teeth on the crank when comparing to a 2jz vvti.  If not then I guess we will need to cut off the extra teeth on the cam. 

I will send the log and session later today, but I believe it should be pretty clear looking at that pic if things are phased like the 2jz.  Unfortunately I do not have a scope capture of the 2jz to compare to.    

AEM_NS
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I don't have any logs of 2JZ

I don't have any logs of 2JZ VVTI cam and crank signals to compare your pic to. I'll have to see if someone else might have some but if they were the same, I'd expect Stat Sync to turn on.

AEM_NS
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Well after looking at this

Well after looking at this some I've realized that the 2JZ VVTI cam pattern isn't the same as the 2ZZ. The 2JZ VVTI is 3 evenly spaced teeth and the 2ZZ is a 4-1 pattern so they're totally different patterns and it's not going to sync. Another app that we do support that might have the same timing pattern is the 2GR-FE but it has digital cam sensors.

shuetuning
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Will VVTI work with only one

Will VVTI work with only one cam trigger tooth if I do the generic 36-2 with 1 cam?

 

AEM_NS
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Universal missing tooth crank

Universal missing tooth crank patterns with a single cam tooth will support one variable cam.

shuetuning
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Ok that seems like our only

Ok that seems like our only option then.  Thanks for the help.