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Hughb
Trainee


Joined: 15 Jul 2019
Posts: 73
Location: Somerset


PostPosted: Tue Feb 11, 2020 12:07 pm    Post subject: Misbehaving clock Reply with quote

The digital clock display in the instrument cluster seems to have two times in its memory.

It comes up with a 'wrong' time and I reset it to the correct time. When I stop the car for a while and restart it, sometimes it starts off with the correct time .... and sometimes it starts off with the wrong time and then spontaneously jumps to the correct time that I set earlier..... and sometimes just stays with the wrong time.

The wrong time does not appear to be a random time, but rather a time that is a fixed interval different from from the correct time (need to confirm this).

Anyone had any experience of anything like this?
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2003 996 C2 manual 87k
 
  
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Paynewright
Monza


Joined: 17 Apr 2018
Posts: 232
Location: Nr Lutterworth Leics


PostPosted: Tue Feb 11, 2020 1:36 pm    Post subject: Reply with quote

Has it got PCM?

There was a post a while ago that the PCM configuration cannot accept the latest date format which is part of the GPS signal (IIRC). Mine will not show the correct date. I’ve also seen the time issue you describe.
 
  
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Hughb
Trainee


Joined: 15 Jul 2019
Posts: 73
Location: Somerset


PostPosted: Tue Feb 11, 2020 4:13 pm    Post subject: Reply with quote

Yes, it does have PCM
not sure which version without looking ... but i can disconnect the battery without having to input a radio code so i think that makes a PCM with MOST.

I had a search on this forum for PCM issues and found this post:

http://911uk.com/viewtopic.php?t=46399 which tells me that there is, in fact, two potential clock times ..... one in the PCM and one in the OBD.

Changing the PCM one should 'reflect on the OBD' it says, but it would appear that mine is not doing that.

So I will have a go at setting the PCM clock (didn't even know there was one!) and will report back.
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Paynewright
Monza


Joined: 17 Apr 2018
Posts: 232
Location: Nr Lutterworth Leics


PostPosted: Tue Feb 11, 2020 10:02 pm    Post subject: Reply with quote

Oohh I’ll have a look at that! Part way through waxoiling and brake pipes at the moment (while the arch liners / undertrays off)

Ian
 
  
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Hughb
Trainee


Joined: 15 Jul 2019
Posts: 73
Location: Somerset


PostPosted: Tue Feb 11, 2020 10:53 pm    Post subject: Reply with quote

Success! For the moment...

Set the time on the PCM and hey presto, the time updated the digital time display on the instrument cluster.

Am out for a long trip tomorrow so will get a chance to see that the time ‘sticks’ on this correct setting.

If so, then we can conclude that the PCM time overwrites anything entered on the time adjuster knob on the instrument cluster.

Now I notice that the PCM date has dropped back to year 2000, and there are plenty of posts to read that talk about the difficulty of correctly setting that!
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Paynewright
Monza


Joined: 17 Apr 2018
Posts: 232
Location: Nr Lutterworth Leics


PostPosted: Tue Feb 11, 2020 11:21 pm    Post subject: Reply with quote

Mine is a 2003 C2 manual Smile

On near identical mileage too!!
 
  
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Hughb
Trainee


Joined: 15 Jul 2019
Posts: 73
Location: Somerset


PostPosted: Wed Feb 12, 2020 9:06 am    Post subject: Reply with quote

Well, after a near 100 mile trip the time issue seems sorted, so ......no issues when the time is entered through the PCM rather than the OBC.

..... but of course I am now looking at the, ‘previously unnoticed’ date on the PCM which is rock steady on 01/06/2000.

From what I can read on this forum, particularly about a ‘satellite rollover’ date in April 2019, there is about as much chance of correcting/adjusting the date as there is of HS2 coming in ‘on budget’.

In the vain hope that there are OCDers out there who have pursued this issue with a tenacity beyond any sense of rationality, does anyone have any ideas?

..... or have I just added a new source of paranoia to the susceptible who haven’t looked at the PCM home screen in detail for a while!
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Wed Feb 12, 2020 9:16 am    Post subject: Reply with quote

Just regard the date as adding to the cars retro appeal...

Let’s all meet up in the year 2000 etc.
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Paynewright
Monza


Joined: 17 Apr 2018
Posts: 232
Location: Nr Lutterworth Leics


PostPosted: Wed Feb 12, 2020 9:19 am    Post subject: Reply with quote

Has it got a flux capacitor?
 
  
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Hughb
Trainee


Joined: 15 Jul 2019
Posts: 73
Location: Somerset


PostPosted: Wed Feb 12, 2020 11:56 am    Post subject: Reply with quote

As luck would have it, I am, this morning, able to give you a considered response to your question.

The 100 mile trip referred to above was in fact a journey to Cotswold Porsche Specialists for the first major service in my ownership. I have been sitting in their waiting room like an expectant father to be, waiting for Lee to accompany me to the service bay to discuss the snag list with the technician. I am sure there are others who can empathise with my anxiety as the hours went by and the anticipated list was, in my head, growing ever longer and more expensive. Citrus fruit in the form of lemons was dominating my thinking....

... but joy prevailed, the list, although having a dozen items on it, had nothing on it that I didn’t already know about, nothing requiring urgent attention and was more a reflection of their forensic examination of the underside and pointing out every bit of minor corrosion, that will be easy to address.

Lee made the point that the list only details the bad points and does not point out the ‘good bits’ of the car. From his positive comments I can conclude that the car is in really good condition for its age and that I have bought a good’un.

An enquiry as to the location of the flux capacitor in the car, however, drew only a puzzled look, so that must remain a mystery.

..... but the sense of relief at the insignificance of the ‘list’ has completely banished my PCM ‘let’s all meet in year 2000’ date issue paranoia.
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