The solenoids allow the aire vac or pressure to go through when there is 12v correct?

 

They're all set up differently. Some get pressure, some get vac, some open-vent with 12v, etc, etc. You'll need to study the FSM fairly closely to work them all out.

 

We know what happened to the last guy who suggested that they were to lazy to look for Info right under their noses.

 

yeah he's at the bottom of a lake somewhere...lol...just joking

 

but still, the basic conecept is correct yes? If a 12v is bot supplied to say a pressure solenoid, does the pressurized air get vented, or just capped?

 

For those who are too damn lazy to look......there are two types of solenoid on these cars. One will pass air/vacuum when 12v and a ground are present....the other will not pass air/vacuum when 12v and a ground are present.

For those tooooo lazzzzzy to read.......there is 12v constantly on the solenoids once the key is put to Start. The solenoids are operated by the ECU putting a Ground on the solenoids. I'm talking about the Relief, Switching, Fpr, EGR, Twin Scroll or Blue, Grey, Orange, Yeller and Green

The FPR solenoid passes vacuum to the FPR nintey nine point nine percent of the time. The only time it does not....is during HOT START. During that time the ECU puts a ground on the Orange solenoid for blank seconds. You look up how many seconds. That act puts the fuel rail pressure on a n/a at its highest pressure. Something like 38 to 42 psi.

Look at the solenoids. Look at the Blue (Relief solenoid) and then look at the Grey (Switching solenoid). NOtice the physical differences??? The Blue passes vacuum when energize. The Grey does not pass air when energized. Thats your clue to what happens when both a ground and 12v exist. The alternate mode is passing air/vacuum thru the filer that exists on each one.

You lazy people are going to join Jimmy Hoffa in Yankee Stadium, if you don't watch yourselves. I don't care if I have to dig up right field again to bury you. humor

 

Or if you want......when the FPR gets both a ground and 12v for those fifty seconds *HOT START*, the FPR sees atmospheric pressure. Once the fifty seconds passes the FPR sees either vacuum which will make the fuel rail pressure something like 28 to 32 psi, or if your boosting with a turbo, you'll get up to 50 psi as the fuel rail pressure. Thats because once the grould signal is removed from the orange solenoid, it now provides a path for vacuum/pressure to the FPR. As in manifold pressure/vacuum.

You can bypass the solenoid and most likely never notice it. Just run a vac hose from the FPR directly to the source of vacuum/pressure for the orange solenoid.

 

FYI, all of the solenoids are identical. All have three connections (common, normally open, normally closed), but they're all plumbed up and operated differently. Some have the filter on the NO port, others have it on the NC port. All depends what it's required to do. The FSM schematic explains all.

 

Well.. i wasn't so lazy as to read, just going to the shop to get the book. This is more information than I could have pulled from it quickly though. Thank you *very much. Very helpful information, coincidentaly it was exactly what i was looking for too.

Thanks

 

PickY, pickY. Ok then ammend the other posts to read SOLENOID/VALVE (The whole shebang) when talking about the Orange, Blue, Grey, Green, and Yellow black things that make/do not make, a path from one point to another. Darn NZ attack dog.

The Blue when engergized allows a path from the intake manifold to the Relief valve in the acv.. When not energized, the path from the intake manifold is broken.

The Grey when engergized will not allow a path from the intake manifold to the Switching valve in the acv.

The Orange when energized will allow a path from the intake manifold to the FPR.



The Yellow when energized will........ah fudge, go look it up.

 

Does anyone have a s5 FSM page number for the solenoids?