See also:

Vehicle Data Recording and Privacy
This GM vehicle has a number of sophisticated computers that record information about the vehicle’s performance and how it is driven. For example, the vehicle uses computer modules to monitor and c ...

Engine Fan
If the vehicle has a clutched engine cooling fan, when the clutch is engaged, the fan spins faster to provide more air to cool the engine. In most everyday driving conditions, the fan is spinning slo ...

Emissions Inspection and Maintenance Programs
Some local governments may have programs to inspect the on-vehicle emission control equipment. For the inspection, the emission system test equipment is connected to the vehicle’s Data Link Conn ...