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Advise Please?

Bob Lovelace

Bob Lovelace

PCGB Honorary Member
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My 2000 996 C4 has developed a fault? The PSM + ABS dashboard lights came-on yesterday on the way home from the Cotswold rally. [:mad:]

I stopped the car, switched off the engine (to reset) and on start-up and for maybe 5 minutes the lights remained "off" [:)]

After (as I said) several minutes and maybe a few miles they came on again? [:(]

Can anyone advise why this should be?

The car has recently been serviced (in fact being a "Stirling's" car has been over serviced) having covered 24,000 only and having had it's 48k last February followed by a mini-service last month.

The small service was carried out by my own local Porsche specialist Dr.Reed, and I have chosen NOT to renew my annual OPC warranty as at £900 odd quid a pop I feel this in now way assures me that I have cover for all exceptions!

I would be grateful for any input.

Many thanks in anticipation:

Bob Lovelace
 
Sounds like a dodgy ABS sensor - you'd need to get it plugged into the diagnostic computer to find out which one.
 
that's the maf sensor, I had mine changed a few weeks ago as exactly the same thing kept happening, they tried to fix on their computer but it never worked. It was free as it's under warranty so saved about 400 quid. You can get them a lot cheaper though .
 
I can't see how it could be the MAF - that controls fueling & we're talking about electronic stability control / ABS faults. Besides, on a pre-facelift C2, you don't have PSM do you?
 
Believe it or not Nick, the MAF sensor can trigger an ABS/PSM fault light. Here is a quote from Loren at Renntech:

"Check for a P0102 fault. P0102 is the same error you will get if the MAF is unplugged. This can also cause ABS and PSM lights to come on as the DME is not sensing the PSM data and combining it with the throttle position and mass air flow readings"

PSM is far too clever for it's own good!
 
ORIGINAL: Richard Hamilton

Believe it or not Nick, the MAF sensor can trigger an ABS/PSM fault light. Here is a quote from Loren at Renntech:

"Check for a P0102 fault. P0102 is the same error you will get if the MAF is unplugged. This can also cause ABS and PSM lights to come on as the DME is not sensing the PSM data and combining it with the throttle position and mass air flow readings"

PSM is far too clever for it's own good!
Click to expand...

Obviously [:)]

No wonder mechanics play "replace the part" so often if all these systems are so inter-dependant. You'd have thought that Porsche could spare a few extra memory locations to allow fault code logging for specific sensors so that this dance could be avoided. OTOH, I suppose it's all revenue to their dealers parts departments (or am I being too cynical?).
 
ORIGINAL: Bob Lovelace

My 2000 996 C4 has developed a fault? The PSM + ABS dashboard lights came-on yesterday on the way home from the Cotswold rally. [:mad:]

I stopped the car, switched off the engine (to reset) and on start-up and for maybe 5 minutes the lights remained "off" [:)]

After (as I said) several minutes and maybe a few miles they came on again? [:(]

Can anyone advise why this should be?

The car has recently been serviced (in fact being a "Stirling's" car has been over serviced) having covered 24,000 only and having had it's 48k last February followed by a mini-service last month.

The small service was carried out by my own local Porsche specialist Dr.Reed, and I have chosen NOT to renew my annual OPC warranty as at £900 odd quid a pop I feel this in now way assures me that I have cover for all exceptions!

I would be grateful for any input.

Many thanks in anticipation:

Bob Lovelace
Click to expand...

Another common cause of this on pre-facelift cars is a faulty brake light switch. This lives just above the brake pedal and is very cheap and easy to replace, thankfully. They were notorious for falling to bits and immeditely cause the ABS + PSM fault lights you mentioned. Unfortunately, failure of this switch starts as an intermittent fault so it can be difficult to diagnose. Keep an eye on it and see if the next time the warning lights come on is just as you hit the brake pedal.

Hope this helps
 
5 Minutes on the porsche lap top ( PIWIS) should diagnose the problem,
Only experienced it on 2 cars and it was the steering angle sensor
 
ORIGINAL: jamma

that's the maf sensor, I had mine changed a few weeks ago as exactly the same thing kept happening, they tried to fix on their computer but it never worked. It was free as it's under warranty so saved about 400 quid. You can get them a lot cheaper though .
Click to expand...

Went to see Dr Reed yesterday and he diagnsed the MAF sensor is creating issues down-stream.

The MAF sensor showed-up as being under it's value, therefore feeding duf info to the cars electronic's.

I beieve he has it sorted.....new MAF sensor on it's way.

Cost wise do I need to lie-down?

BobL
 
I read a thread on piston heads a while back, someone bought one for 150 ish if I recall right. It's a 5 min job to fit yourself apparently. I can't remember where they bought it from it was something like Deutsche car or German car .

ORIGINAL: Bob Lovelace

ORIGINAL: jamma

that's the maf sensor, I had mine changed a few weeks ago as exactly the same thing kept happening, they tried to fix on their computer but it never worked. It was free as it's under warranty so saved about 400 quid. You can get them a lot cheaper though .
Click to expand...

Went to see Dr Reed yesterday and he diagnsed the MAF sensor is creating issues down-stream.

The MAF sensor showed-up as being under it's value, therefore feeding duf info to the cars electronic's.

I beieve he has it sorted.....new MAF sensor on it's way.

Cost wise do I need to lie-down?

BobL
Click to expand...
 
I have had the same problem for somtime, but my warning light only comes on when i accelrate hard, as in above 5000 revs, its almost like a fault when pressing the accelrator hard, as soon as you switch off then it clears, and you can drive all day and it does not come on until you accelrate hard. Any ideas? Will have it checked out soon.

Phil
 
The MAF sensor is about £150 from www.eurocarparts.com. Phil - yours could be the same problem - possibly incorrect readings from the MAF at higher air flow if it occurs at high engine speeds. It makes it more unlikely to be an ABS sensor, steering angle sensor, or brake switch.
 
ORIGINAL: philippe

I have had the same problem for somtime, but my warning light only comes on when i accelrate hard, as in above 5000 revs, its almost like a fault when pressing the accelrator hard, as soon as you switch off then it clears, and you can drive all day and it does not come on until you accelrate hard. Any ideas? Will have it checked out soon.

Phil
Click to expand...

Phil,

Thats the kiddie mate, if you stop and re-start, or get home and use again, all is well until you "give-it-some" - As soon as the car starts to get some engine revs/power the light comes-on! [:mad:]


Suspect you have the same problem mate....

Perhaps a "bulk" buy is in order? [:D]

Dr Reed is probably going to order from OPC Exeter, so better call him and steer him towards ECP.......[;)]

One thing I do suspect is that I have lost power/performance and fuel consumption is down as a result of this suspect part.[:mad:]

BobL (Bob of the curves)
 
Mine felt a lot quicker once I had it fitted .

ORIGINAL: Bob Lovelace

One thing I do suspect is that I have lost power/performance and fuel consumption is down as a result of this suspect part.[:mad:]

BobL (Bob of the curves)
Click to expand...
 
I have not noticed a power problem still feels quick, I shall take it to my opc and get them to check it out, i have the warranty so lets hope its covered whatever the out come is, shall let you know, as and when.

Phil
 
It's def covered its in the warranty broshure so don't let them fob you off



ORIGINAL: philippe

I have not noticed a power problem still feels quick, I shall take it to my opc and get them to check it out, i have the warranty so lets hope its covered whatever the out come is, shall let you know, as and when.

Phil
Click to expand...
 
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