Instead of using physical hardware switches, "multimapping" leverages the ECU's internal structure and vacant memory slots. Datablocks (Codings):
Because the EDC15 hardware does not have a physical "Sport" button or a complex infotainment system to select drive modes, the Multimap solution uses existing inputs—specifically the Cruise Control buttons—to toggle between different states of engine tune. edc15 multimap
Heavy towing requires rich mixtures to keep EGTs down, but that same mixture on an unloaded car causes excessive smoke and high EGTs from over-fueling. With Multimap, you have a dedicated towing map. With Multimap, you have a dedicated towing map
The power of multimapping lies in versatility. Instead of a "one-size-fits-all" tune, you can have a map for every occasion: The primary appeal of EDC15 multimapping is versatility
EDC15 multimap is a custom modification for the Bosch EDC15 Engine Control Unit (found in many older VW, Audi, Seat, and Skoda TDI models) that allows you to switch between different engine tunes—such as Eco, Performance, and Valet—on the fly using existing car controls like the cruise control stalk or brake pedal.
The primary appeal of EDC15 multimapping is versatility. A driver might configure three distinct profiles:
Because the EDC15 does not have torque-based EDC16+ logic, it is actually easier to implement robust multimap on than later ECUs, which have complex real-time operating systems.