6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPCM Lost GPS
Leading reported evidence
Disconnect following its weekly visit
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
The power has been disconnected following its weekly visit to the workshop since the dash lit up like Blackpool the other morning.
Leading evidence: 'Disconnect following its weekly visit' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust (calibrating) pcm navigation unit' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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1
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Performed · outcome unconfirmed
"” GPS receiver: After an interruption in the power supply (terminal 30), the installed GPS receiver loses its so-called almanac.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
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Suggestion
91 12 15 Adjusting (calibrating) PCM navigation unit
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
The distance signal changes if the circumference of the tyre changes (e.g.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
...new problem this week...my PCM doesn't seem to know where I am, the map display shows I am a few hundred yards away from my actual location...what the heck would cause this, can I reset, do I really have to pay another trip to OPC?
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Many thanks to Richard and Ashley - great advice, the 1-4-8 reset worked a treat and all back to normal now!
Hi - first ever post,
I'm a newbie Porsche owner 5 weeks in - awful experience to date...heater packed in, abs and psm failure, battery light on every other day...and my 996 mint only 19k miles from OPC but never mind am bearing with it...
...new problem this week...my PCM doesn't seem to know where I am, the map display shows I am a few hundred yards away from my actual location...what the heck would cause this, can I reset, do I really have to pay another trip to OPC?
Any tips appreciated...
Paul
Paul!!
Could the power have been disconnected? If so, it might be just a case of waiting 20 minutes with the car out in the open. (see bottom of page). If the battery light has been coming on, it is a possibility.
Another thing you could try is a re-boot, by pressing keys 1-4-8 at the same time. (It might be 1-4-7, perhaps someone else could confirm.
These are the instructions for recalibrating the PCM.
HTH
91 12 15 Adjusting (calibrating) PCM navigation unit
General
The PCM navigation unit must be calibrated after maintenance work or commissioning. Calibration is the prerequisite for exact route guidance.
The following components of the PCM navigation unit must be calibrated or initialised:
"” GPS receiver: After an interruption in the power supply (terminal 30), the installed GPS receiver loses its so-called almanac. The almanac stores the satellite orbits and ensures fast location of the individual satellites when the system is started.
"” Distance sensor: The distance sensor transmits the distance travelled to the PCM navigation unit. The distance signal changes if the circumference of the tyre changes (e.g. tyre change). This modification must be calibrated by the PCM navigation unit afterwards.
Note
The distance sensor must be calibrated after commissioning of the PCM navigation unit or after changing a tyre. If a system that has already been calibrated is disconnected from the power supply (terminal 30), the calibration of the distance sensor is retained.
"” Gyroscope: The gyroscope detects changes in the direction of travel and must be calibrated after commissioning.
The gyroscope shows temperature-dependency. This temperature-dependency is compensated by the system if the "cold" (not calibrated) system is switched on and left to stand for approx. one hour.
Note
The gyroscope must be calibrated after commissioning only. If a system that has already been calibrated is disconnected from the power supply (terminal 30), the calibration of the gyroscope is retained.
Procedure after commissioning:
Please observe the sequence!
"” Switch on the PCM with a free panoramic view for approx. 20 minutes (to load GPS almanac).
"” Drive on a motorway if possible at a speed greater than 60 km/h for a distance of approx. 50 km (calibration of the distance measurement).
"” Drive approx. 10 km in an urban area and take frequent turn-offs. Stop for approx. 10 seconds occasionally (calibration of the gyroscope).
"” Switch on the PCM navigation unit for approx. one hour with the vehicle horizontal (temperature compensation of the gyroscope).
Calibration is necessary after the following maintenance work:
"” After changing a tyre
"” After the power supply has been interrupted
Procedure after changing a tyre
"” Drive on a motorway if possible at a speed greater than 60 km/h for a distance of approx. 50 km. (Calibration of the distance measurement).
Procedure after the power supply has been interrupted:
"” Switch on the PCM with a free panoramic view for approx. 20 minutes (to load GPS almanac).
Many thanks Richard,
The power has been disconnected following its weekly visit to the workshop since the dash lit up like Blackpool the other morning.
I did a 1hr commute to today and had the PCM on all the time but mostly motorway so will give it another whirl at the weekend and try a re-set also.
Appreciate the advice - Thanks!
Paul
