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Author Topic: ODBII only read codes with engine running  (Read 535 times)

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Jan Suhr

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ODBII only read codes with engine running
« on: 20 May 2024, 08:37:29 »
On my 3.2L Omega 2002

I have a problem with my ODBII port, I can't read any codes with only IGN on, it read with engine running.

When I was at the inspection the other day they mentioned this but didn't give me any remarks on it.
So by that I conclude that the problem is in the car


Why is that, it has been working properly earlier, could it be something broken in the connector?
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Jan Suhr
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YZ250

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Re: ODBII only read codes with engine running
« Reply #1 on: Yesterday at 10:38:32 »
Out of curiosity, if you connect the code reader and start the engine and then turn the key back one click so that the engine stops but the ignition is still on, does the code reader read the vehicle then.  :-\
I seem to recall that I had to do this on odd occasions with my 3.2 when using a generic code reader.
Although you say it was working fine previously.  :-\
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TheBoy

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Re: ODBII only read codes with engine running
« Reply #2 on: Yesterday at 16:51:24 »
Ign on should be enough.

Are you getting power on the ODBII port with ign off?  Should have perm 12v supply to it.
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TheBoy

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Re: ODBII only read codes with engine running
« Reply #3 on: Yesterday at 16:51:57 »
Quote from: YZ250 on Yesterday at 10:38:32
Out of curiosity, if you connect the code reader and start the engine and then turn the key back one click so that the engine stops but the ignition is still on, does the code reader read the vehicle then.  :-\
I seem to recall that I had to do this on odd occasions with my 3.2 when using a generic code reader.
Although you say it was working fine previously.  :-\
The keeps the W contact at 12v.
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Jan Suhr

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Re: ODBII only read codes with engine running
« Reply #4 on: Yesterday at 17:33:00 »
Quote from: TheBoy on Yesterday at 16:51:24
Ign on should be enough.

Are you getting power on the ODBII port with ign off?  Should have perm 12v supply to it.

Yes it gets power when everything is off, but the reader needs ignition on to connect and link to the car.

Everything looks OK with IGN on until I want to read codes or erase codes then it says it can't link to vehicle.

Same problem had the guy at the inspection.

Just before the inspection I got connected with engine running to see if there was any codes that could cause a notification at the inspection. And it works as expected then.

I'll check on my other 2.6 Omega and see how it behaves.
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Jan Suhr
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