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ggrantw
Silverstone


Joined: 05 Aug 2009
Posts: 113
Location: Cambridgeshire


PostPosted: Thu Nov 01, 2018 3:01 pm    Post subject: Help!....PSM and ABS warning light Reply with quote

Car been parked up overnight and drove 100 metres from home when brakes locked up, steering went heavy and I came to a standstill as if I applied the brakes heavily. Both the PSM and ABS warning lights are on. Luckily I managed to get it back home with a struggle! Anybody got any ideas please? Question

Thanks!
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14270
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 01, 2018 3:26 pm    Post subject: Reply with quote

Is your steering heavy if you're not moving but engine running and you turn lock to lock?
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ggrantw
Silverstone


Joined: 05 Aug 2009
Posts: 113
Location: Cambridgeshire


PostPosted: Thu Nov 01, 2018 4:53 pm    Post subject: Reply with quote

No.steering is fine as had a new steering rack fitted about 18 months ago by JZM.
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alex yates
Brands Hatch
Brands Hatch


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

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 01, 2018 5:32 pm    Post subject: Reply with quote

You have a fault with the monitoring system by the sounds of things. If any of the wheel sensors are giving incorrect readings then the system will actuate the "what it thinks" necessary measures, i.e. drop power, actuate brakes, etc.

Either get a Porsche tester plugged in or use some old school methodology to diagnose where the problem is.
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ggrantw
Silverstone


Joined: 05 Aug 2009
Posts: 113
Location: Cambridgeshire


PostPosted: Thu Nov 01, 2018 5:39 pm    Post subject: Reply with quote

Any suggestions as to what methodology Question

Thanks..
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14270
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 01, 2018 6:12 pm    Post subject: Reply with quote

If its driveable but applying brakes whilst you drive, pull over and have a feel of your discs to see which brakes or brake are being applied.
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ggrantw
Silverstone


Joined: 05 Aug 2009
Posts: 113
Location: Cambridgeshire


PostPosted: Thu Nov 01, 2018 7:48 pm    Post subject: Reply with quote

It’s not driveable!....I struggled to get back the 150 metres home....it’s at least the rear brakes!
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5330
Location: Brighton


PostPosted: Thu Nov 01, 2018 7:58 pm    Post subject: Reply with quote

A few questions ..

Have you had any work done on your car recently ?

Did you just drive on a straight road at normal speed or did you throw it into a round about or a corner which may have activated the PSM ?

Did you use the brakes whilst this happened ?

Did it feel to you as you struggled home that the brakes were binding or being applyed ?

reason for questions ..

I have once come across a problem with a C4 and ONLY a C4 with brakes locking on .. its as rare as hens teeth so i dont want to go into it atm untill i have a little more info as it will lead you up the garden path so to speak .

Im also thinking steering angle sensor calibration is out .. but you need to have had geo work done recently for it to be this ..
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ggrantw
Silverstone


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Posts: 113
Location: Cambridgeshire


PostPosted: Thu Nov 01, 2018 8:32 pm    Post subject: Reply with quote

Yes I have when it was in storage...amongst other things, real wheel bearing and disc skimmed. I was only about 150 metres from home after reversing off the drive and heading in a straight line. I did not use the brakes ...it felt as though the brakes had been applied then remained on! The brakes appeared to be fully applied on the way home. The new steering rack was calibrated when fitted.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5330
Location: Brighton


PostPosted: Thu Nov 01, 2018 8:58 pm    Post subject: Reply with quote

Steering rack was a long time ago so thats out .. you have had work done .. ie a wheel bearing so was this the first trip out after this work ?

Sounds like something is binding a wheel and not what i first thought .. you have to have PSM activated to cause this issue and thats a master cyl fault .

You need a fault code read out and jack up each wheel in turn to see which ones are binding.
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ggrantw
Silverstone


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Location: Cambridgeshire


PostPosted: Thu Nov 01, 2018 9:09 pm    Post subject: Reply with quote

No..have had the car back over six weeks ago with no issues at all. Had the master cylinder and brake pipes replaced earlier this year..
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14270
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 01, 2018 9:15 pm    Post subject: Reply with quote

Have you tried pulling the ABS/PSM fuse out and seeing if it's driveable?
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ggrantw
Silverstone


Joined: 05 Aug 2009
Posts: 113
Location: Cambridgeshire


PostPosted: Thu Nov 01, 2018 9:26 pm    Post subject: Reply with quote

No!...is it ok to do that??
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14270
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 01, 2018 11:03 pm    Post subject: Reply with quote

When I had a fault on mine the rear RH caliper kept braking causing problems driving it and a hot rear RH disc. Removing the fuse just disabled any ABS/PSM braking, thus making the car driveable until I had it fixed.
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ggrantw
Silverstone


Joined: 05 Aug 2009
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Location: Cambridgeshire


PostPosted: Fri Nov 02, 2018 8:24 am    Post subject: Reply with quote

Ok...will try that today!
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ggrantw
Silverstone


Joined: 05 Aug 2009
Posts: 113
Location: Cambridgeshire


PostPosted: Fri Nov 02, 2018 11:14 am    Post subject: Reply with quote

Ok...taken the fuse out and run the engine but brakes still locked on solid! Steering is fine.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5330
Location: Brighton


PostPosted: Fri Nov 02, 2018 5:37 pm    Post subject: Reply with quote

Ok .. Brakes all locked on and i think its the master cyl .. the C4 i worked on a few years back turned out to be a bent retaining pin in the master cyl .. the customer liked to drive it agressively and often had the PSM kick in .. some how this caused a back pressure in the master cyl and led to this happening .

We cracked the brake pipes at the master cyl to reduce the pressure and enable the car to be moved ... you could crack off each brake caliper in turn to reduce pressure as well .

For you this is a garage job as im guessing here and the above fault is something ive only seen once BUT it was a C4 so thats all ive got im afraid .
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ggrantw
Silverstone


Joined: 05 Aug 2009
Posts: 113
Location: Cambridgeshire


PostPosted: Sat Nov 03, 2018 2:55 pm    Post subject: Reply with quote

Thanks guys for all your help...will have to get the AA to recover me to a garage on a flatbed!! Sad
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