A method for real time programmability of an engine electronic control unit (ECU).
The present invention allows a user to update calibration data previously stored
in memory in the engine ECU with new calibration data sent from an external device.
The user can monitor the effects of the new calibration data on the engine instantaneously
without having to wait for a period of time for the new calibration data to be
permanently stored in the engine ECU's memory. To permanently store the new calibration
data into the main memory, an erase/reprogram subroutine is uploaded from the main
memory to a temporary memory. After the erase/reprogram subroutine is uploaded
into the temporary memory location, the erase/reprogram subroutine will execute
and permanently download the new calibration data into the main memory in response
to a predetermined vehicle event.
