7. Engine management systems
An engine management system enables the engine
to function with minimum emissions under a wide
range of operating conditions. It also uses a variety
of sensors to optimise combustion by altering how
the engine operates, thus maximising fuel economy,
engine power and engine life. A system that is not
designed specifically for the engine it is fitted to is
likely to increase emissions, reduce engine power,
have poor fuel economy and reduce the life of the
engine.
Non-original electronic chips or computers, whether
fitted as a direct replacement or in a ‘piggy-back’
configuration, are not permitted to be used in an
engine management system unless it can be
demonstrated that their installation and use allows
the vehicle to meet the appropriate ADR. They must
also be sealed or otherwise constructed so as not to
be reprogrammable.