Pre requsites for going "on cam"

[Gooby]

Gentleman (and ladies)
What needs to happen for a 2ZZ engine to go on cam?

ie -
Correct reading from temp sensor,
Oil bypass valve activated

etc

[GhostDriver]

a bmw up my butt

[cej]

Assuming it works like VTEC in the Honda powerplants the speed also needs to be above a certain value as well as oil pressure (for those with a VTEC oil pressure sensor..the JDM versions doesn't have it). Also the intake manifold vacuum and/or TPS sensor needs to be above a certain limit.

[Beachbum]

Correct temp on temp sensor for at least 10mins.
Not about to go into a bend as you go on-cam
No nearby Rozzers

[shangani]

I take it this means they haven't found the problem yet?

You must be incandescent by now. Bad luck. You can borrow mine if you are having withdrawal - I now have Shannon's old shed as a daily hack when needed.

[Beachbum]

Oh so this was a serious question......ooops.

Whats happened now Gooby ?

[Gooby]

cej said:

Assuming it works like VTEC in the Honda powerplants the speed also needs to be above a certain value as well as oil pressure (for those with a VTEC oil pressure sensor..the JDM versions doesn't have it). Also the intake manifold vacuum and/or TPS sensor needs to be above a certain limit.

TPS sensor is an interesting idea but the yota has a sensor on the cam shaft to tell it engine speed so I dont believe the TPS will have a influence on switchover.

Oil pressure sensor and temp sensor have been ruled out as has ECU fault....

[cej]

TPS most certainly has an influence. Below a certain amount of throttle the 2nd cam will not get activated (assuming once again it's similar to a Honda)

I wasn't talking about engine speed,but vehicle speed. Although engine rpm also is a factor. It could be something like this:

• vehicle speed above 20 km/h
• oil pressure above 6 bar
• water temp above 70 deg C
• engine rpm above 6000
• intake manifold pressure above 600 mbar ( above 70% throttle)

Not exact numbers,but it's just to give an idea of how many criteria needs to be met for it to activate 2nd cam.

[ptp170]

Maybe there is a shoddy connection on the temp sender/connectors etc that keeps 'resetting' the 10 min timer?


Chris


/also read about a dodgy fuse that blows and that disables the 2nd cam...

[wooooody]

I remember a chap in Scottishelises having 2zz trouble when the number 6 fuse in the engine bay on his exige blew. It stuck 'on cam' at all times, so ran like a pile of ste. Apparently this was due to low oil. Perhaps something similar has happened, the No6 fuse has blow and stuck your car off cam. I have no idea when it comes to the electronics aspect of car stuff.

[subaqua]

???? Can no-one from Westy's (OK Lotus) tell you.... Lotus wrote the engine management software ????

[Gooby]

subaqua said:

???? Can no-one from Westy's (OK Lotus) tell you.... Lotus wrote the engine management software ????

Mumble - Lotus know the software, not the mechanics....

[ptp170]

Don't know if some of this helps/aids your fault finding??


http://www.geocities.com/killer_siller/2zzvvlcontr...

http://www.mijime.com/forum/viewtopic.php?t=943&am...

[Gooby]

ptp170 said:

Don't know if some of this helps/aids your fault finding??


http://www.geocities.com/killer_siller/2zzvvlcontr...

http://www.mijime.com/forum/viewtopic.php?t=943&am...

That is great - I will show the guys.
Thank you.

[Silent1]

Oil pressure or oil level

Honda VTEC engines wont go into vtec if the oil is low, maybe they're the same.