Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, ARE due Dec 6th, 2021. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

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)

PSM and ABS Cautions on 996


Recommended Posts

While detailing my 02 996 C4S I raised each wheel independently and rotated the wheel back and forth by hand in order to clean the inside of the wheels and clean the brake calipers. When I went to start the car to move it, both the PSM and ABS caution lights immediately came on. If I restart the car they go off but after driving for a few minutes they come right back on. I have driven about 300 miles since this occurred and it continues every time I drive. I wouldn’t think the 4 wheel drive is that sensitive or that by simply rotating a wheel independently would cause this but it has. Do I need to have the dealer reset the system? Did I mess up the calibration? Any help would be greatly appreciated.

Thanks!

Link to comment
Share on other sites

Perhaps the sensors [don't know where they are located] became misaligned when just one wheel was rotated enough so that the error was triggered. I'd simply call the dealer first and see what they tell you. Seems too coincidental for the error lights to pop up right after the detailing effort.

Link to comment
Share on other sites

Perhaps the sensors [don't know where they are located] became misaligned when just one wheel was rotated enough so that the error was triggered. I'd simply call the dealer first and see what they tell you. Seems too coincidental for the error lights to pop up right after the detailing effort.

Wheel sensors are bolted into the hub, way too secure to be disturbed by rotating wheel. I pulled all the wheels and looked at each sensor. Was hoping someone else had a similar experience and would save me a trip to the dealers.

Link to comment
Share on other sites

  • Moderators

1) The front sensor wiring has a weak point when the wheels are hanging free on the suspension, the INSIDE wiring will break between the attachment grommet, (on the shock absorber) and the wheel well cause the infinitely many up and downwards movements of the wheels during the years of driving.

2) Check the brake switch.

3) Check the MAF.

Link to comment
Share on other sites

1) The front sensor wiring has a weak point when the wheels are hanging free on the suspension, the INSIDE wiring will break between the attachment grommet, (on the shock absorber) and the wheel well cause the infinitely many up and downwards movements of the wheels during the years of driving.

2) Check the brake switch.

3) Check the MAF.

That makes sense, I will check the wiring. Not sure what the MAF has to do with the ABS though??? I saw that on another thread. Assuming MAF = Mass Air Flow sensor!

Thanks!

Link to comment
Share on other sites

OK, Did some checking; what the normal range is for a MAF sensor on my 2002 996 C4S. My readings are at .94 at idle and about 2.5 lbs/hr at about 2K RPM. Seems low to me. Also, the ABS PSM lights come on when I first touch the brake after I have started moving. Brake switch? Brake lights work?

As always, thanks any advice.

Link to comment
Share on other sites

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.