Mapping the engine involves filling the look-up tables with the correct values for your engine. The tables are calibrated for an engine by adjusting the values of the cells within the tables.
WARNING
Driving a vehicle over time, on poorly tuned maps can lead to engine damage over that period. To ensure that your fuel maps are correct, a wide-band Air/Fuel ratio meter must be used at some stage to measure the Air/Fuel ratio over all engine loads and speeds at which you intend to operate the vehicle.