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04-01-2009, 03:59 PM
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CEL on but no fault codes
The dreaded check engine light came on today, so I hooked up the Durametrics software diagnostic tool to see what was up. Surprisingly there are no fault codes showing in any of the diagnostic categories, yet the CEL persists. This leads me to wonder how comprehensive the Durametrics software really is. It must be missing something. I have the latest software version (5.1.3) that's available from the Durametrics Web site.
Anybody have any clue why there would be a CEL without fault codes?
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04-01-2009, 04:11 PM
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Re: CEL on but no fault codes
You might try emailing Duram and asking him about it (he was pretty helpful when I was having problems resetting the service reminder) - he may want you to create and send him a work log from your connection.
FWIW, I have had CELs that weren't even recorded as fault codes for the dealer's PIWIS to read. 
If the CEL stays on, then I would take it to your dealer, if I were you.
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Last edited by KS-CS; 04-01-2009 at 04:13 PM.
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04-01-2009, 07:22 PM
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Re: CEL on but no fault codes
Is the gas cap on tight? 
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04-02-2009, 08:09 AM
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Re: CEL on but no fault codes
Originally Posted by K-Man S
Is the gas cap on tight? |
Good thought but unfortunately that's not it. CEL remains on this morning. 
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John
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'86 944
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04-02-2009, 08:37 AM
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Re: CEL on but no fault codes
Originally Posted by jake
Good thought but unfortunately that's not it. CEL remains on this morning. |
Is the car also running in 'Limp Mode'
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04-02-2009, 10:46 AM
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Re: CEL on but no fault codes
Originally Posted by Nick_USA
Is the car also running in 'Limp Mode'
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No, the car is running completely normally. There is no obvious sign of anything wrong, other than the CEL itself.
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John
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04-02-2009, 11:12 AM
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Re: CEL on but no fault codes
Try using the Durametric function which resets the service reminder. If that doesn't work I would go through and recheck all of the diagnostic parameters again for a code one more time.
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04-04-2009, 05:51 PM
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Re: CEL on but no fault codes
I hooked up the Durametrics diagnostic again today but I still don't see any fault codes in any category and the CEL remains on. I also went through each category and did a fault code clear even though there were no codes showing, just to see if that would make a difference (it didn't).
I did clear a service reminder a little over a week ago before I had the CEL problem, so I'm wondering if that could have something to do with this...?
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John
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'89 944 Turbo
'86 944
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04-04-2009, 06:54 PM
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Re: CEL on but no fault codes
You could try disconnecting the battery for awhile and see if it resets everything when you reconnect it. You will have to drive around a bit for everything to return to normal if you do.
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04-06-2009, 11:45 AM
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Re: CEL on but no fault codes
Originally Posted by Santa Fe
You could try disconnecting the battery for awhile and see if it resets everything when you reconnect it. You will have to drive around a bit for everything to return to normal if you do.
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BINGO!!! That did the trick.  I guess the ECU had gotten itself into some spurious state that got cleared by disconnecting the battery. Santa Fe, you are a GENIUS!!! 
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John
'07 997 GT3
Previous cars:
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'89 944 Turbo
'86 944
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