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Old 05-18-2002, 10:36 AM   #1
Jasno999
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Default How do you reset the ECU to get rid of a CEL?

How do you reset the ECU to get rid of a CEL?
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Old 05-18-2002, 10:45 AM   #2
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Please help me.
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Old 05-18-2002, 11:13 AM   #3
Judah
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If you want to reset the ECU, just un-hook the negative battery cable and step on the brakes, that drains all the energy out of your car and resets the ECU. But that doesn't mean that it will get rid of a CEL though. If you have a problem, the CEL will come back on.
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Old 05-18-2002, 11:43 AM   #4
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This is a tricky matter if you have a UniChip. If you reset the ECU it will "forget" it's current fuel/timing map and go back to the default one. While this will get rid of the CEL the ECU will not learn to accomodate. In other words, with the UniChip misfire CEL's are common, and if you reset the ECU the car won't have a chance to learn to live with the slight delay in the singal (what it interprets as a misfire). The best thing to do is to pull the CEL code via an OBD2 scan tool and then reset the CEL.

--Matt
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Old 05-18-2002, 12:03 PM   #5
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Quote:
Originally posted by Obsidian
This is a tricky matter if you have a UniChip. If you reset the ECU it will "forget" it's current fuel/timing map and go back to the default one. While this will get rid of the CEL the ECU will not learn to accomodate. In other words, with the UniChip misfire CEL's are common, and if you reset the ECU the car won't have a chance to learn to live with the slight delay in the singal (what it interprets as a misfire). The best thing to do is to pull the CEL code via an OBD2 scan tool and then reset the CEL.

--Matt
So your saying that is if i used a OBDII Scanner to pull the code and used it to remove the code, the ECU wont forget its current mappings? Or it will? BTW-I usually use the Snap-On OBDII Scanner to pull codes & remove them. TIA!
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Old 05-18-2002, 12:18 PM   #6
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Quote:
Originally posted by Need4Boost


So your saying that is if i used a OBDII Scanner to pull the code and used it to remove the code, the ECU wont forget its current mappings? Or it will? BTW-I usually use the Snap-On OBDII Scanner to pull codes & remove them. TIA!
If you use OBD2 software you can reset the code without losing your other ECU memory. That's what I do whenever I get a CEL. I had a problem with EGT sensor high output when it was cold out. I got the software from that i-club group buy for like $70. Make sure you open the task manager (Ctrl-Alt-Delete) and close any tasks that may tie up your com port. It took me a while to figure that out.
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Old 05-18-2002, 01:01 PM   #7
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Where can you buy the wscanner? How does it work?
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Old 05-19-2002, 01:25 AM   #8
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yup I got mine with the group buy that Jon (in CT) set up. I got all the modules for $140. Actaully just today I got the a misfire CEL that I pulled and reset. first for me and stage 0. Maybe you can get someone local to pull the code for you.

It is actually software that you install on your laptop or computer. They sent you a cable that connects to the serial port of your computer and teh OBDII port in the car (under the steering wheel).

Cheers

Nick
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Old 05-19-2002, 01:29 AM   #9
hotrod
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Default not all CEL lights are equal

Just a note that not all CEL's are the same. There are some non-critical CEL's that will go away on their own after 4 engine restarts if the condition does not exist.

FWIW
Larry
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Old 05-19-2002, 01:54 PM   #10
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Ok.

I still would like to know where I can purchase a scanner.
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