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)

self braking 996 4S 2002 :-( Faultcodes 4340 4460 4276)


Recommended Posts

Hello everybody! My 2002 996 4S has a strange problem.....

While i left home two weeks ago, i first noticed that the brakepedal felt hard... thereafter i noticed initially that the car didnt seem to roll easily.... it felt like there was a little bit off brake power applied to the wheels.....

Entering the highway, at a speed op 70 miles/hr the wheel started to shiver , initially a little bit, but quickly increasing in force. I thought it was a flat tire, so i stopped..... When speed decreased i noticed that the car was braking by itself. After the car came to a full stop, and i checked the tires ( no flat tires) i tried to drive away but i couldnd, the wheels were locked..... I had to call for a tow a way truck...... I saw three warnings on the dash, amber: psm failure, drive to workshop, amber: ABS failure and red: WARNING brake distribution......

the strange thing however: after the car was delivered to the dealer it seemed to be ok..... No more warnings and the wheels were free again.... I noticed that brakefluid was forced out of the reservoir a little bit.....

The dealer is looking into the problem now for two weeks already and they still have no glue what the problem is.... It comes back after a few minutes of driving the car....

Faultcodes:

4340

4460

4276

Does anybody have an idea? I hope somebody recognice the problem........

Thanx for reading this post anyway!

Dennis

Link to comment
Share on other sites

  • Admin

Fault code 4276 -- Valves voltage supply

Possible cause of fault

- Fuse E9 faulty

- Short circuit or open circuit in the B+/ground supply to the control unit

- Hydraulic power unit faulty

Fault code 4340 -- Stop light switch

Possible cause of fault

- Fuse E9 faulty

- Short circuit or open circuit in the B+/ground supply to the control unit

- Hydraulic power unit faulty

Fault code 4460 -- Pressure sensor

Possible cause of fault

- Short circuit to ground/8+ or open circuit

- Plug connection on stop light switch faulty

- Incorrect adjustment of the stop light switch

- Wiring/plug connection between pressure sensor and control module faulty

- Pressure sensor faulty

I would start with fuse E9 - then reset the codes and see which come back.

Link to comment
Share on other sites

  • 1 year later...

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.

×
×
  • 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.