In
order to meet Federal Exhaust Emission and Fuel Economy regulations,
today's vehicles are equipped with highly sophisticated electronic
engine control systems. These systems do not require periodic
adjustments. The only services required on a scheduled basis are
spark plug and filter replacement. Tune-ups, as we knew them, are no
longer necessary.
Engine Control Computer
The computer
receives information from a network of sensors and switches that
convert engine operating conditions into electrical signals. Based
on the information and instructions stored in the computer program,
commands are then sent to three primary systems:
Ignition System
Fuel
System
Emission Control
System
The
sensors that monitor one or more of these systems
include:
