FMA

Automotive lingo abbreviation for Fuel Mean value Adaptation (Kraftstoffmengen-Mittelwertadaptation). It corrects injection errors based on MAF modelling and Lambda output.

Bosch EDC16 series offers short and long-term tables of corrected injection errors.

Example

1. Driver requests IQ 55mg of fuel, which translates into 32° of crankshaft
2. ECU checks FMA tables and finds out that last injection event caused excessive smoking at 32°
3. injection duration is corrected down to 31.7° based on historical injection errors