Car model and year: Porsche 991.2 with PCM4.0 without the Bose amp.
Symptom:
Deleted
my PCM head unit. The downside is that the OEM shelf isn’t tilted
enough, under hard acceleration your phones/keys/whatever you put in
there will fly out…
Problem
though, is that the bootup sequence of the car has a certain PCM check
in it. Without the head unit, once the key is inserted and the lock
barrel turned, the following “System Fault” message shows up:
Porsche 991.2 coding tool to use:
Get access to a PIWIS 3
Professional technician suggestion:
I just took a quick look, here’s how I did it when my radio was out.
From
component overview list, select Gateway -> Maintenance Repairs tab
-> Actual/Specified Configuration menu -> Confirm PCM is displayed
with a red minus sign under “actual installation” -> Accept (F8)
Back to component overview
Select
Instrument Cluster -> Manual Coding -> Next -> Uncheck PCM
related options -> Accept -> *Take screen shot of old and new
values at confirmation screen*
That should take care of the message in your cluster. You probably will have to clear stored faults too.
PIWIS
may change some unrelated configuration parameters in your cluster,
which is why I suspect you’re seeing some weird errors from your
dealer’s attempts to fix this. If this happens, you need to put your
PIWIS in engineering mode and correct the parameters individually using
the screenshot of changed values.
If you plan on selling your
PCM4, you can’t un-pair your VIN from the head unit like in previous
versions. If you sell your PCM, the new owner will need to deactivate
component protection at a Porsche Dealership (or anywhere with a PPN
login and PIWIS III).
Finally! Solved!
Update: got it done
just like–“Accepted the actual vs. specified config in the Maintenance
Repairs tab and instantly dash error was gone, thanks!!
A couple discoveries along the way:
1.
PADM error message is unrelated. In Actual Values there’s no current
flowing to the left dynamic engine mount. A bit of searching here
suggests I’m not the only one with a problematic dynamic mount. One for
warranty.
2. Chalk the oil fill level message to an oversensitive
sensor. Following a weekend of aggressive pulls and really running the
car (must’ve burned some oil in the process) an “electronic dipstick”
check cleared the dash before I even started on PIWIS.
3. While
in PIWIS I was naturally curious and pulled the vehicle analysis log
(“VAL”). Interesting bits: one can definitely log overrevs just by
hitting the rev limiter! I logged double-digit ignition counts in Range 1
and 2. Doesn’t concern me one bit, my RS ain’t “auction material” in
this or the next life. Mechanically, in Carrera Cup the same blocks
regularly see 9k+ in downshifts (against an 8.8k redline and 100hr
rebuild intervals) ditto 9.4k+ on the GT3R. But those looking to
maintain a sterling DME should be aware!
4. Apparently there are
different “authorization” levels of PIWIS. You heard it right, not all
PIWIS are licensed the same. After solving my dash error at home, I
showed my process to friends at the sole official dealer in Hong Kong.
Really not to throw shade at their failed attempt, but to share with
them what I learned. They went “whoa we don’t get these screens in our
system, probably because of the different certificate levels given to us
by the factory…” Both of us were floored to say the least, knowing how
much the factory charges for their official PIWIS subscriptions!!
BTW,
Piwis III is really decent Porsche coding tool with a bunch of new menu and coding options when comparing to
Piwis II.