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eatapeach
Newbie


Joined: 11 Mar 2016
Posts: 30
Location: Cheshire


PostPosted: Mon Jul 30, 2018 12:39 pm    Post subject: TPMS experts Reply with quote

Hi

I have a TPMS problem that started a few weeks ago, car is Gen 1 997

I got a ns rear low pressure warning, so I checked all 4 tyre pressures and found them to be fine.

Then I got ns front and rear warnings. Then three pressure warnings. Sometimes over inflation, sometimes under inflation.

The TPM units themselves were all new in January, and are OPC units.

So a visit to the OPC was booked for checking the sensors. All 4 show 92 months life left in them, so there isn't a failing one and a dominant one to report back the wrong reading.

The OPC reset everything, and it was back in learning mode. In about an hour it was back to square one, the OPC says to bring the car back for further investigation.

Some days there isn't a problem at all, some days it seems to go into random warning mode.

If the sensors aren't faulty, what is the module receiving the reports - is it a stand alone module or part of a main ECU?

Has anyone had any prior problems with hot weather and intermittent faults on TPMS?
 
  
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T8
General
General


Joined: 29 Jun 2010
Posts: 14631
Location: Kent


PostPosted: Mon Jul 30, 2018 12:44 pm    Post subject: Reply with quote

I had exactly this issue with my Jaguar XF. Jaguar replaced the control module and it was cured. On that car is was stand alone unit.
_________________
2007 Guards Red 997 Turbo Tiptronic
ex 2004 Polar Silver 996T Tiptronic
ex 2002 Seal Grey 996.2 C4 Tiptronic
ex 1978 Silver 924 Manual
 
  
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T8
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Joined: 29 Jun 2010
Posts: 14631
Location: Kent


PostPosted: Mon Jul 30, 2018 12:50 pm    Post subject: Reply with quote

I've just looked in the '997 Essential Companion' and it says that the TPMS control unit is installed in the luggage compartment on the left next to the PSM hydraulic unit so yes it is a stand alone unit.
_________________
2007 Guards Red 997 Turbo Tiptronic
ex 2004 Polar Silver 996T Tiptronic
ex 2002 Seal Grey 996.2 C4 Tiptronic
ex 1978 Silver 924 Manual
 
  
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eatapeach
Newbie


Joined: 11 Mar 2016
Posts: 30
Location: Cheshire


PostPosted: Mon Jul 30, 2018 1:01 pm    Post subject: Reply with quote

T8 wrote:
I've just looked in the '997 Essential Companion' and it says that the TPMS control unit is installed in the luggage compartment on the left next to the PSM hydraulic unit so yes it is a stand alone unit.


Ah that's good news I guess - I'm doing man maths about a possible bill and a stand alone unit is always cheaper than a multi-function unit Very Happy

My assumption at this point is that the control unit is buggered and needs replacing.
 
  
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T8
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General


Joined: 29 Jun 2010
Posts: 14631
Location: Kent


PostPosted: Mon Jul 30, 2018 1:13 pm    Post subject: Reply with quote

T8 wrote:
I had exactly this issue with my Jaguar XF. Jaguar replaced the control module and it was cured. On that car is was stand alone unit.


If it's not the sensors I can't see what else it would be apart from the control module. Dont know
_________________
2007 Guards Red 997 Turbo Tiptronic
ex 2004 Polar Silver 996T Tiptronic
ex 2002 Seal Grey 996.2 C4 Tiptronic
ex 1978 Silver 924 Manual
 
  
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eatapeach
Newbie


Joined: 11 Mar 2016
Posts: 30
Location: Cheshire


PostPosted: Mon Jul 30, 2018 1:52 pm    Post subject: Reply with quote

T8 wrote:
T8 wrote:
I had exactly this issue with my Jaguar XF. Jaguar replaced the control module and it was cured. On that car is was stand alone unit.


If it's not the sensors I can't see what else it would be apart from the control module. Dont know


yes that's my assumption too

Any ideas about cost of the module?
 
  
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jonno_
Spa-Francorchamps


Joined: 29 May 2014
Posts: 285
Location: Oxfordshire

2005 Porsche 997 Carrera 2S

PostPosted: Mon Jul 30, 2018 2:11 pm    Post subject: Reply with quote

Not sure new, but there are some on eBay for less than £50.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5349
Location: Brighton


PostPosted: Tue Jul 31, 2018 7:03 pm    Post subject: Reply with quote

If the fault or rather the pressure it indicates is a few psi down then control unit is the most obvious .. if you get a reading of zero pressure then i might lean towards an antenna fault .. that would be a bit strange for different wheels at the same time though .

There are 2 types of tpm sensors that fit in the wheel but if the wrong one was fitted it just wouldn,t work .
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eatapeach
Newbie


Joined: 11 Mar 2016
Posts: 30
Location: Cheshire


PostPosted: Wed Aug 01, 2018 1:30 pm    Post subject: Reply with quote

deMort wrote:
If the fault or rather the pressure it indicates is a few psi down then control unit is the most obvious .. if you get a reading of zero pressure then i might lean towards an antenna fault .. that would be a bit strange for different wheels at the same time though .

There are 2 types of tpm sensors that fit in the wheel but if the wrong one was fitted it just wouldn,t work .


So it's settled down to 2 errors - one where it has a -- next to all 4 wheels and saying "add air" or three wheels exc offside rear showing -3bar. So it's booked in again at Wilmslow. It's the correct type fitted as they were working fine.

I'll keep this updated when it gets fixed.....




.
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5349
Location: Brighton


PostPosted: Wed Aug 01, 2018 6:58 pm    Post subject: Reply with quote

If it says - 3 bar then i dont think the control unit is comunicateing with the sensor so its any part of the system im afraid .. OPC will sort it though .. i have faith in them Very Happy
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