4AGE 20v ISCV

**JustCallMeOrlando** · 09-05-2008, 01:55 PM

Hey all,

I'm chasing how the 4AGE 20v ISCV works. From what I gather, it's a 3 wire stepper motor but the details around the net are a bit sketchy. Is anyone able to provide any info?

I've searched the forums, but 20v is hard to pinpoint because of the way the search drops short words.

Cheers,
Nathan

**The Witzl** · 09-05-2008, 02:09 PM

they bolt to the head, and to a pull-push action to control air flow via PWM... not stepper motor.

.... to make matters REALLY annoying, i'm lead to believe that they also restrict air flow as temperature rises with a bi-metallic valve (ie, are more open when at air temp), which is why they are bolted to the head.

Of course a 20V workshop manual would explain all

**JustCallMeOrlando** · 09-05-2008, 02:51 PM

Interesting. Some of the descriptions on the net call it a stepper. Are the blacktop and silvertop ones the same?

**TooF** · 09-05-2008, 03:04 PM

i thought all the 20v units were a PWM unit where the gze 16v ones are a stepper

**skiddz** · 09-05-2008, 03:08 PM

karl is correct i have one sitting on my desk as well as my manual on the screen

**c2888** · 11-05-2008, 11:51 PM

http://dutch.northwestmr2.com/Toyota...Control/12.pdf
I found this a while ago, most of the abbreviations for Toyota engine control stuffs, the rest of the pages have good info too.

idle up specifics
http://dutch.northwestmr2.com/Toyota...Control/07.pdf

**chad85** · 06-03-2009, 11:30 AM

Do you just leave the bottom pipe ,which usually goes to intake pipe, unblocked to suck in air if you are using trumpets/stacks??? if u block it off while its running it just dies....