Correct way to clear OBD1 codes ?
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Laughing Gas
Joined: Oct 2014
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Correct way to clear OBD1 codes ?
E-150, 5.8/351
The Haynes manual says not to disconnect battery (for whatever amount of time) to clear codes because it also clears the keep alive memory forcing the computer to relearn.
What is the correct way to clear codes?
The manual says talks about jumping the OBD connectors some way but I cannot tell what is showing in the picture.
Thanks.
The Haynes manual says not to disconnect battery (for whatever amount of time) to clear codes because it also clears the keep alive memory forcing the computer to relearn.
What is the correct way to clear codes?
The manual says talks about jumping the OBD connectors some way but I cannot tell what is showing in the picture.
Thanks.
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From: Virginia
I know of no other way to clear the EECIV codes other than taking the negative battery cable off for a period of time.
You should already know the codes in memory, and if you have repaired something that was throwing a code, you do want it to relearn now that you have it fixed. It will run a little weird for a day or so till it does relearn certain sensors.
You should already know the codes in memory, and if you have repaired something that was throwing a code, you do want it to relearn now that you have it fixed. It will run a little weird for a day or so till it does relearn certain sensors.
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From: Virginia
P.S. I did hear that you can get setup with the jumper and let it start spitting codes, and then unplug the plugs in the middle of it sending codes and it will reset it partially. You can try that, I have never done it before.
Hotshot
Joined: Jan 2004
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From: St Louis
If you don't care about the relearn procedure (it's not a big deal, the computer will do it automatically), you can indeed just pull the either the negative cable or the fuse for the PCM's KAM (if implemented).
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From: Virginia
He is talking about using the dash light or a testlight to read the codes, and it flashes the codes. You do not need a code reader to read the codes on these old computers. Unplugging the small plug on the code reader while it's giving codes should do the same thing.
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Laughing Gas
Joined: Oct 2014
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Oh, the dash light. 
I would think that unplugging it while in process would damage something.
Thanks.
I would think that unplugging it while in process would damage something.
Thanks.
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Hotshot
Joined: Jan 2004
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From: St Louis
There are OBD-1 code readers out there. Some are simple adapters with a switch and an LED that do the same thing as a jumper and the CEL. There are others that read the "fast codes" that are sent out before the slow flash sequences.
Depend on what he's got.
Depend on what he's got.
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From: Virginia
No, you unplug the small plug under the hood that starts the code retrieval process, not the light.
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Laughing Gas
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What I meant was I would be afraid of damaging the code reader or the ECU by unplugging the reader while in the middle of testing.
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