Ross said:
Disconnecting the battery won't do anything as far as "un-programming" an after market chip, will it? After reconnection, the chip will still do the same things it did before, right?
Aftermarket Chips will 'reprogram' your vehicles PCM to a certain degree.
This reprogramming happens every time you turn on your ignition.
The reprogramming that is done is to modify the PCM's working parameters so that
whatever modifications you have made will be utilized within these new parameters.
The PCM by itself, has a set of stock calibrations, and a 'learning' mode to create its own set of working parameters.
These learned parameters have to fall within a range of specs set by the calibration in the PCM.
When the 'learned' parameters fall outside the range of the stock calibrations, your Check Engine Light is turned on.
The Aftermarket Chip takes care of the parameters and alters them so that the Chips programming
will not create a CEL unless the parameters are outside the range set by the chip's calibration.
Sometimes, even with the technology we have today, we need to cold start our PCMs
to clear any irrelevant data that may have been written to the PCM.
To do this requires a no power condition for 20 minutes or more so that everything
inside the PCM loses all charges and the memory is lost.
This does not affect non-volatile memory, such as the memory in the Aftermarket Chip,
that holds the chip's programming, or the calibration inside the PCM, that holds the OEM programming.
It only affects the 'working' memory of the PCM that holds the 'learned' parameters.
Have I confused you enough ??? :help: :help: :help: