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OBD-II diagnostic computer issues and question


 
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JerseyJim
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Joined: 06 Nov 2006
Location: New Jersey, USA

PostPosted: Mon Nov 06, 2006 8:42 am    Post subject: OBD-II diagnostic computer issues and question Reply with quote

My 1998 Grand Cherokee failed to start one morning. It cranked well but never caught. Fuel was OK, etc.

I had it towed to the dealer and was told that because the battery was run down (they apparently tried starting it themselves until the battery ran out completely) that the diagnostic computer's memory was wiped and they can't find out why the Jeep wouldn't start and other event history.

Is this true? Is the OBD-II event log memory volatile? After a bit of Googling I am now familiar with the codes and capabilities of the OBD but couldn't confirm my dealer's claim.

Thanks in advance,
Jim
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Tardis
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Joined: 07 Aug 2004
Location: Ohio

PostPosted: Mon Nov 13, 2006 9:23 pm    Post subject: Reply with quote

Quote:
Is this true? Is the OBD-II event log memory volatile? I am now familiar with the codes and capabilities of the OBD but couldn't confirm my dealer's claim.

It's possible. OBDII is capable of storing 12 hours of memory. An extended power loss/failure causes the ECM to lose memory, and eventually clears the data logger. A 'good' car garage 'always' scans the ECM data log before any tests or mechanical work is done. They probably tried starting your Jeep without charging the battery or scanning it first, ran the battery all the way down, and wiped out the memory. I'm surprised they didn't find the problem. OBDII is gravy to use compared to OBDI. There's way less guessing involved. All of the sensor/component data is right there. Get a second opinion...
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98' TJ, 99' XJ
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JerseyJim
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Joined: 06 Nov 2006
Location: New Jersey, USA

PostPosted: Wed Nov 15, 2006 2:36 pm    Post subject: Reply with quote

Thanks for the reply.

BTW: This happened at a 5 star Jeep service dealer!
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