Well my 95 owner's handbook (p116) refers to 'retraining' the inj control unit for the Bosch SPI monojetronic on the 1108cm (156 C.046) engine only.
The Haynes manual 81-95 (section13-34) 7 states: "The ECU is 'self-learning'..." and gives details in 'speeding up' the learning process in para's 80-82.
Though I've changed the battery on mine and not noticed much difference,
hope this helps
mick