Toyspeed.org.nz Message Board

by **hare** » Mon Jan 15, 2007 7:47 pm

I know it's a long shot,but anyone have a echo/vitz here?I just want to know about the VVTi sensor,do the two wire have power when the car start or it will have power if the VVTi kick in.

by **matt dunn** » Mon Jan 15, 2007 9:59 pm

hare wrote:I know it's a long shot,but anyone have a echo/vitz here?I just want to know about the VVTi sensor,do the two wire have power when the car start or it will have power if the VVTi kick in.

Um I can only see one wire in that plug?

U sure it's the one for the VVTi?

by **hare** » Mon Jan 22, 2007 6:57 pm

um,...yes,I can see one wire IN,but the plug is two wire.
I am sure it's for VVTi since it's what been told by north shore toyota unless they don't know what they are doing..... :roll:

matt dunn wrote:
hare wrote:I know it's a long shot,but anyone have a echo/vitz here?I just want to know about the VVTi sensor,do the two wire have power when the car start or it will have power if the VVTi kick in.

Um I can only see one wire in that plug?

U sure it's the one for the VVTi?

by **thaphatty** » Mon Jan 22, 2007 8:18 pm

power in from ecu.....earth through block...... im sorry what was the question

by **Alex B** » Mon Jan 22, 2007 9:34 pm

Just because the plug is 2 wire does not mean they are both connected.

by **hare** » Mon Jan 22, 2007 10:11 pm

the question is when the wire suppose to have power,is it after start the car it suppose to have power all the time,OR when VVti kick it it suppose to have power?

I checked two different VITZ,they both don't have power anytime.so is it mean the VVTi is not working?

thaphatty wrote:power in from ecu.....earth through block...... im sorry what was the question

by **Alex B** » Tue Jan 23, 2007 12:04 am

How are you checking if it has power? With a multimeter i take it? How have you got the multimeter set up. And i would say they would be even more of a gutless peice if the VVT-i was not working.

by **thaphatty** » Tue Jan 23, 2007 9:03 am

Supposed to have power to solenoid during cold cranking/startup. That I know. And I would assume it would also have power supplied/climbing after a designated RPM to change cam timing.

Definitely shouldn't have power supplied all the time.

(Edit for Clarification) Define: during = While ignition key is on "Start" rather than "On"

by **hare** » Tue Jan 23, 2007 2:28 pm

yes,I think it should have power when it reach some RPM as well,but I rev it from 0 to redline it still no power....

While ignition key is on "Start" rather than "On" is it mean turn the key two clip and make everything power on,but not start the car?

thaphatty wrote:Supposed to have power to solenoid during cold cranking/startup. That I know. And I would assume it would also have power supplied/climbing after a designated RPM to change cam timing.

Definitely shouldn't have power supplied all the time.

(Edit for Clarification) Define: during = While ignition key is on "Start" rather than "On"

by **hare** » Tue Jan 23, 2007 2:32 pm

um,...I understand what you mean,but I let my mechanic to do it,I except he should know what he is doing...

pyro_sniper2002 wrote:How are you checking if it has power? With a multimeter i take it? How have you got the multimeter set up. And i would say they would be even more of a gutless peice if the VVT-i was not working.

by **big_boy** » Tue Jan 23, 2007 2:39 pm

ant they load orranted as well

by **blitzr4** » Fri Mar 07, 2008 3:03 pm

big_boy wrote:ant they load orranted as well

i thought it would be aswell getting signals from speed sensor etc?

Website · by **Bling** » Fri Mar 07, 2008 4:55 pm

yeah easiest way is to get someone to sit in the engine bay and test it while you go for a thrash

by **nz_climber** » Fri Mar 07, 2008 8:11 pm

I am not sure if its meant to be on or off, but one reason why there might not be any voltage showing up is it could be square wave or sinewave that the sensor uses.. and earth through the block.
I will check on the altezza wiring diagram I have as thats got the expected signal outputs to and from the ecu.. as that might help as I guessing vvti sensor is similar..

by **Crampy** » Fri Mar 07, 2008 9:39 pm

My guess would be that due to it being VVTi, it would be a PWM waveform. It would need it like that to variably change the timing, not like the VVT on 20V 4AGEs, which is just on or off.

by **matt dunn** » Fri Mar 07, 2008 9:51 pm

Crampy wrote:My guess would be that due to it being VVTi, it would be a PWM waveform. It would need it like that to variably change the timing, not like the VVT on 20V 4AGEs, which is just on or off.

probably,

check for that with a multimeter that has duty cycle or frequency,
although frequency will only tell you that it is PWM or not, wont tell you what it is doing.

by **nz_climber** » Sat Mar 08, 2008 1:14 pm

Well not sure if this will be much help, but here is a picture of the waveform expected for the altezza vvti (output from the ecu) - so will give you an idea
what to look for, like others have said it is pwm waveform..

by **Alex B** » Sat Mar 08, 2008 5:15 pm

Talk about thred from the dead....

by **Crampy** » Sat Mar 08, 2008 5:17 pm

Nice research Aaron.

It'd be a piece of piss to check it with a Scopemeter, but most people don't have access to that sort of kit.

I suppose another way to check would be to unplug it and drive it, then plug it in and drive it again. It there is a difference, it's working. No difference, then it isn't.

Dunno of you'll really be able to tell by the seat of the pants dyno though.

by **hare** » Sat Apr 05, 2008 4:49 pm

thanks everyone for the help,but no too worry about it since the car been on the dyno last week and find that what's the problem at last,now just waiting for the computer tune be done and should be ready for this year autosalon.

Toyspeed.org.nz Message Board

VVTi sensor

VVTi sensor

Re: VVTi sensor

Re: VVTi sensor

Who is online