New User, Question about ECU reset
07-31-2006, 10:26 PM
#26
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Join Date: Dec 2005
Posts: 1,735
Originally Posted by hayalex6
... they are new 64 bit learning ECU's.
See https://www.scionlife.com/forums/vie...119480&start=0.
If the Yaris has a 32-bit, why should the xB need 64-bit?
And what is there that the ECU must learn or unlearn or forget? It processes engine management data in the present.
If the ECU does remember "data logging", it is for the record in diagnostics, it is not for the immediate present management of the engine.
The May 12 post by Jhhnn seems right:
"... I've seen no real evidence that the ECU actually "learns" from my driving. OTOH, it seems to me that it's just doing what it's supposed to do- using the feedback from the various sensors to very closely regulate injection timing and duration, ignition timing and cam timing. If it builds an internal table from feedback/ experience for that stuff, then it's just more able to do it's job. If you want to to things differently, then it'll need to be reprogrammed or have some device to alter the feedback signals installed- the Greddy emanage does just that..."
Back to the point, there is no evidence that the ECU has any engine management "learning" that can be can be improved by unplugging its power. That seems only good for clearing trouble codes.
08-01-2006, 12:35 AM
#27
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Join Date: Dec 2005
Posts: 1,735
Originally Posted by vintage42
... Back to the point, there is no evidence that the ECU has any engine management "learning" that can be can be improved by unplugging its power. That seems only good for clearing trouble codes.
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Clearing Trouble Codes
All trouble codes must be purged from the ECUs memory after repairing the faults. Otherwise, code(s) would remain in the ECUs memory indefinitely and would appear along with a new code in the event of a future problem.
Remove the EFI fuse (15A) for 30 seconds with the ignition switch OFF to clear any codes. It may take longer than 30 seconds, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out).
Trouble codes can also be cleared by disconnecting the vehicle battery. However, other memory functions (clock, radio, etc.), will need to be reset.
After the codes are cleared, road test the vehicle (as applicable for the fault) and recheck if any codes reset. If so, it indicates that the trouble area has not been repaired correctly.
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In other words, removing the fuse or disconnecting the battery is only for clearing trouble codes from the ECU's memory.
Not to help the ECU relearn about the CAI you just installed or the premium gas you just put in the tank.
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