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NotoriousREV
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Joined: 05 Jul 2019
Posts: 55



PostPosted: Wed Oct 23, 2019 2:17 pm    Post subject: PSM Off and ABS warning lights Reply with quote

After 15 mins driving both of these lights are coming on. I’m not getting an engine check light and they clear when the car is restarted. Is there a way to diagnose this without a scanner? Do any of the eBay OBD scanners work on 996s (mine’s a 1999 C4) or do I need a Porsche specific one to read everything?
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17022
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Oct 23, 2019 2:41 pm    Post subject: Reply with quote

Porsche specific. Although there are some basic checks you can do yourself like checking brake and clutch pedal switches. First though I'd be a bit more specific on what/when/why they're coming on. Eg. Are you in motion when it happens or can you make it do it when stoppd, etc.
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NotoriousREV
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Joined: 05 Jul 2019
Posts: 55



PostPosted: Wed Oct 23, 2019 2:59 pm    Post subject: Reply with quote

I haven’t tried it any other way but they come in whilst in motion after driving for about 15 minutes. It’s happened on the last 3 times I’ve taken it out.
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17022
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Oct 23, 2019 3:07 pm    Post subject: Reply with quote

Are you cornering at the time, driving spirited, braking, changing gear , etc?
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NotoriousREV
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PostPosted: Wed Oct 23, 2019 3:13 pm    Post subject: Reply with quote

Just cruising on the motorway.
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17022
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Oct 23, 2019 3:16 pm    Post subject: Reply with quote

Pass.
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ViciousViper
Newbie


Joined: 09 Jun 2019
Posts: 23



PostPosted: Wed Oct 23, 2019 3:33 pm    Post subject: Reply with quote

I had the exact same symptoms. Turned out my ABS pump was toast Rolling Eyes
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7232
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Wed Oct 23, 2019 3:47 pm    Post subject: Reply with quote

Maybe ABS wheel speed sensor? OBD will tell you.
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17022
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Oct 23, 2019 3:50 pm    Post subject: Reply with quote

deMort will probably know.
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7450
Location: Brighton


PostPosted: Wed Oct 23, 2019 6:29 pm    Post subject: Reply with quote

I'm afraid you need a tester to read out fault codes or watch actual values of the speed sensors whilst driving to locate the fault .

It's going to be heat related hence after 15 mins of driving and i suspect a wheel speed sensor is under reading at that point but without checking codes / values then there is no easy way to determine the fault .

Pre fault code days and we had to scope each sensor and test every relay , wiring connections etc to find a fault .. huge amount of time taken doing it this way .

I will say that the driveshaft rotors on 996 are corroding badly these days .. a judder on the pedal at low speed will indicate this as the abs has kicked in at approx 10 mph due to the sensor seeing almost joined up segments due to the rust .

Not your fault but something for others to consider .
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NotoriousREV
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Joined: 05 Jul 2019
Posts: 55



PostPosted: Wed Oct 23, 2019 8:23 pm    Post subject: Reply with quote

Cheers deMort, I’ll book it into my usual indy to get it read. My indicator switch has broken today, too. This could be a pricey week.
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7450
Location: Brighton


PostPosted: Thu Oct 24, 2019 7:35 pm    Post subject: Reply with quote

It's starting to sound that way but fingers crossed it won't be .. a fault code and i can help further .
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