PCM write problems, cabling ?

They go by many names, P01, P59, VPW, '0411 etc . Circa 1999 to 2006. All VPW OBD2 PCMs.
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Re: PCM write problems, cabling ?

Postby antus » Fri Aug 21, 2020 8:54 am

most definately noisy power from the alternator or regulator. the noise on the vpw bus is enough for the interface to think another message is being transmitted when it isnt.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: PCM write problems, cabling ?

Postby joukoy » Sun Sep 13, 2020 7:41 pm

- Moved OBD2 gnd from dash to engine, problem continues
- Moved OBD2 +12v source from dash to distribution point under hood, problem continues
- Added new signal wire from pcm to OBD2 using different route, problem continues

- Original signal wire back, new wire from pcm blue pin 60 to OBD2 pin5 (signal ground): Fixed! :punk:
Or maybe it works few times and break again, let's see...


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