Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)
Sign in to follow this  
uk_monkey

Electrical / earth issue with PSE circuit

Recommended Posts

Hi Folks - a UK forum newbie here with a tech question for the collective, if I may?

 

I have an 07 C4S with the sports chassis option, sports chrono and and X51 factory upgrade. This means it only has a sport switch, which activates the PSE and softens the psm (no PASM due to the sports chassis pack).

 

The PSE is having issues though - essentially it doesn't work properly. On start up the valves are open, but as expected when the vacuum builds up they close. However they don't open when the sport button is pressed. I recently replaced the solenoid as I tested it and it had failed and for a couple of times, the new solenoid worked, but now its stopped.

 

As part of the replacement process, we tested the voltage at the solenoid plug with the sport button on and off. With it off, the plug registered and 12.5v with it on, it dropped to about 8v and the pse worked. After it stopped working, we checked the voltage at the plug again and this time it showed 14.5v when off and 10.5v with it on. So clearly the voltage isn't dropping to 0 as it should do and 10.5v is too much to switch the solenoid. Having been in communications with a couple of people on a UK forum, the feeling is that it's most likely a bad earth causing the volts not to drop to 0.

 

Has anyone on here experienced a similar issue? Could you suggest any tests that I could run in order to identify what the cause could be?

 

I'm thinking a straight forward earth to checck would be the engine loom earth near to cylinder 3?

 

Thanks in advance for your advice and assistance.

 

Monkey

image2.JPG

Share this post


Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Similar Content

    • By CPD996
      I am looking to shave some weight off my 02 with factory PSE. My question is,will a fabspeed ( or any) muffler work with the factory PSE set up? Is it just a matter of removal of oem and replacement with aftermarket? plug and play as its been called? Thanks in advance
      Mike
    • By Rubensdw
      Hi all, 
      This will be my first post, thanks for a great forum ! 

      I've recently purchased a exhaust system from Design911 in the UK which has the valvetronic function on. This is said to replicate the PSE which my car does not have factory installed. 
      Wired it up and put the vacuum hoses, tested the system and it works fine.

      Over to the issue for my car:
      When starting up the car, the neutral positon of the valves is open, which means a lot of noice from the exhaust. 
      When switching this by the solenoid, sending vacuum into the system and the valves closes. This means less sound. 
      But when the valves is closed the car wont run properly at the RPM range of 5500-7000 RPM's there is also fault codes for misfire on cylinder 2.

      The strange thing is that this works perfectly when the valves is open. I've tried two differnet vacuum sources, into the ressonator and also for the left hand side cooling system vacuum solenoids. Without any differnce. I tried to run vacuum directly to the vacuum actuators on the exhaust without any difference and also tried manually applying vacuum and using a one way check valve to keep the vacuum while not connected to the cars vacuum line. No vacuum leaks, no fault codes when driving with the valves open.

      Same result every time. So have anyone had some similar issues to their car ? 
      Thanks in advance for any help ! 

       
    • By BENC911
      I was checking / fixing fuses, pulling them and putting new that kind of stuff and now my windows do not open and the front light are always on! The fuses are ok but I am wondering if by playing around maybe i messed up a relay or something! I tried to fix the fuses to what they should be, in the past the car ( used ) had fuses too big for what the chart called for, so for example i replaced a 30 for a 10 if a 10 was the one needed etc.
    • By simssj
      Car: 2003 996 Cab.
       
      Symptom: The fuse for the front power windows and the fuse for the rear windows will blow instantly when a new fuse is inserted.
       
      History: The car was in winter storage and, though disconnected, the battery went 100% flat. I reconnected the battery and used a jump-start box and she fired right up after letting the battery pick up a little charge. But the windows rolled themselves all the way down and then (I guessing here) the fuses blew. When I replace a fuse, it blows even before I can get it all the way seated.
      Also, when I got the car home I removed the battery and put it on a slow charge, so the car was essentially without power for 2 days.
      I've scanned the car with a Foxwell NT-510 and there are no faults in any system.
       
      I don't have any idea where to start troubleshooting this. I don't know where to find a wiring diagram to begin knowing where to look. I'm handy with tools and comfortable with electricity, but this has me stumped.
       
      Any thoughts on where to begin?
    • By GooseRonalds
      Hey Folks,
       
      New to the forum - just joined - so I hope this is in the right place. This is all in reference to a 2013 Cayenne GTS. I've got three questions I hope someone can help clarify.
      First, I've been reading a bit about the "cut off" between 25-50mph (these numbers fluctuate depending on which forum you are in) regardless of if the PSE is turned on. Is this something that is true? I'm pretty sure I can hear this cut off, but ever since I read about it, I can't tell if it's legitimate or just in my head (Baader-Meinhof Phenomenon type scenario) This post talks about how to remove that by bypassing a diode: http://www.renntech.org/forums/tutorials/article/86-remove-pse-cutout-in-2-minutes-no-tools-required/ If all is true, anyone have any resource on how to finagle this diode on the Cayenne? Where is this diode/relay? Does this mod work for the Cayenne?
      Second, it looks to be about 600TU to install the PSE if you don't have it, but 150 TU to install just the button (model depending). They didn't put the selector button in until 2014, so, does anyone know if you can have it wired in to the 2013? I'd rather look like an idiot here before going to the dealer.
      Third, does anyone have or know of a reputable place to get the full factory manual for the car?
       
      Thanks in advanced!
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.