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Jack D
Monza


Joined: 05 Jul 2011
Posts: 171



PostPosted: Sat Sep 02, 2017 8:57 pm    Post subject: ABS light Reply with quote

Hi, I'm after help in trying to solve a problem, my ABS light has decided to stay on, at first the light was coming on intermittently, but now it's on all the time.
Any ideas ?

Jack
 
  
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gunner
Montreal


Joined: 04 Jul 2014
Posts: 583
Location: Kent


PostPosted: Sat Sep 02, 2017 9:44 pm    Post subject: Reply with quote

From memory it's usually either a sensor or alternator issue.

My came on when the alternator belt gave up the ghost.

I'm sure someone will be along soon with a more convincing answer though.
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993 C2 Tip Aventura
 
  
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9xxnick
Silverstone


Joined: 29 Jul 2014
Posts: 131



PostPosted: Sat Sep 02, 2017 11:46 pm    Post subject: Reply with quote

There could be other causes, but my recent experience was that a faulty wheel speed sensor (one per wheel) causes the ABS control unit to switch the light on immediately before and after starting the engine.

If the light only comes on when the car gets to around 4mph, then the wheel speed sensors are electrically OK but are dirty, resulting in there being no or a corrupted signal to the ABS CU.

The sensor are not especially expensive but are generally a pig to remove from the wheel hub, sadly.
 
  
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ToreB
Approved Trader


Joined: 13 May 2010
Posts: 531
Location: Oslo, Norway


PostPosted: Sun Sep 03, 2017 8:12 am    Post subject: Reply with quote

Use a Porsche compatible OBD diagnosis device to read out the fault code in the unit. This will probably point you directly to the problem.
Cheers,
Tore
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'95 993 C4

Bergvill F/X
Porsche electronics specialists, products and repair services.
 
  
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Jack D
Monza


Joined: 05 Jul 2011
Posts: 171



PostPosted: Sun Sep 03, 2017 11:22 am    Post subject: Reply with quote

Thanks for the replies.
I've just connected a ohmmeter to each wheel sensor, the rear o/s gives no reading at all, so I'm presuming this is the most likely culprit?
The other issue I've just noticed is that the odometer has also stopped working, the speedo works fine, could these two issues be linked ?
Jack D
 
  
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Pretzel
Montreal


Joined: 20 Apr 2014
Posts: 619
Location: Bedfordshire


PostPosted: Sun Sep 03, 2017 6:35 pm    Post subject: Reply with quote

Jack D wrote:
Thanks for the replies. The other issue I've just noticed is that the odometer has also stopped working, the speedo works fine, could these two issues be linked ?
Jack D


Probably not related, odometers tend to stop working around the 100k mark usually because of a worn Gear wheel, speedo usually follows.

There is a do it yourself fix, but most people send the speedo to Julian Reap.

http://www.reapautomotivedesign.com/index.php
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993 C2 Aventura
 
  
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decgraham
Suzuka


Joined: 17 Sep 2008
Posts: 1062
Location: Spain


PostPosted: Mon Sep 04, 2017 8:34 am    Post subject: Reply with quote

Jack D wrote:
Thanks for the replies.
I've just connected a ohmmeter to each wheel sensor, the rear o/s gives no reading at all, so I'm presuming this is the most likely culprit?
The other issue I've just noticed is that the odometer has also stopped working, the speedo works fine, could these two issues be linked ?
Jack D


Hi,

I had my speedo odometer repaired last year. I found the guy on Ebay UK, he did a good job, was knowledgeable and did a quick turn a round. The contact is :

highliftproductions@gmail.com his name is Rick. No affiliation by the way.

The total cost including shipment to Spain was £90.00 I think the repair was £75.00.

ATB Smile
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1995 993 C2 Cab TipS in Guards Red
 
  
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Jack D
Monza


Joined: 05 Jul 2011
Posts: 171



PostPosted: Tue Sep 05, 2017 10:18 am    Post subject: Reply with quote

The rear abs sensors you now have to buy in pairs from porsche main dealers.
The old type have been discontinued, the new type apparently are wired differently and need to be replaced in pairs....a pair from porsche will set you back just under £400.
Sourcing the old type is proving difficult, especially in the uk, I've found a parts dealer in the states who still has a few genuine ones on the shelf.

Jack D
 
  
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Jack D
Monza


Joined: 05 Jul 2011
Posts: 171



PostPosted: Tue Sep 05, 2017 10:21 am    Post subject: Reply with quote

decgraham wrote:
Jack D wrote:
Thanks for the replies.
I've just connected a ohmmeter to each wheel sensor, the rear o/s gives no reading at all, so I'm presuming this is the most likely culprit?
The other issue I've just noticed is that the odometer has also stopped working, the speedo works fine, could these two issues be linked ?
Jack D


Hi,

I had my speedo odometer repaired last year. I found the guy on Ebay UK, he did a good job, was knowledgeable and did a quick turn a round. The contact is :

highliftproductions@gmail.com his name is Rick. No affiliation by the way.

The total cost including shipment to Spain was £90.00 I think the repair was £75.00.

ATB Smile
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Gaity
Silverstone


Joined: 25 Sep 2008
Posts: 112
Location: Mid-Wales and Sunderland


PostPosted: Tue Sep 05, 2017 9:37 pm    Post subject: Reply with quote

Jack D wrote:
The rear abs sensors you now have to buy in pairs from porsche main dealers.
The old type have been discontinued, the new type apparently are wired differently and need to be replaced in pairs....a pair from porsche will set you back just under £400.
Sourcing the old type is proving difficult, especially in the uk, I've found a parts dealer in the states who still has a few genuine ones on the shelf.

Jack D


You have to replace in pairs (if you have old version) because the sensor bars in the new version are 90 degrees different, so I guess there would be a slight signal mismatch if you only replaced one on an axle. I replaced my rears and sourced from Promax Motorsports - less than £50 each.
 
  
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Jack D
Monza


Joined: 05 Jul 2011
Posts: 171



PostPosted: Wed Sep 06, 2017 11:52 am    Post subject: Reply with quote

I have tried them, unfortunately they're closing down the business....
just going to start drilling out the other sensor, no doubt that one is seized in as well.

Jack D
 
  
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Gaity
Silverstone


Joined: 25 Sep 2008
Posts: 112
Location: Mid-Wales and Sunderland


PostPosted: Wed Sep 06, 2017 1:11 pm    Post subject: Reply with quote

Jack D wrote:
I have tried them, unfortunately they're closing down the business....
just going to start drilling out the other sensor, no doubt that one is seized in as well.

Jack D


That's a shame - they have been handy for several parts over the years Sad

Yes, it will be seized!
 
  
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Jack D
Monza


Joined: 05 Jul 2011
Posts: 171



PostPosted: Tue Sep 12, 2017 8:46 pm    Post subject: Reply with quote

Just an update...
New rear sensors fitted and no warning light !
If your ABS light comes on, use a multi meter and check each sensor, simple test to eliminate or pinpoint a defective sensor.

Jack D
 
  
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