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VIN:
Vehicle Identification Number. This is the
factory-assigned vehicle serial number.
This number is stamped on a number
of locations throughout the vehicle, but
the most prominent location is on top of
the dashboard on the drivers side, vis-
ible from outside the vehicle. The VIN
includes information about the vehicle,
including where it was built, body and
engine codes, and a sequential build
number.
VSS:
Vehicle Speed Sensor. This sensor
sends a frequency signal to the PCM.
The frequency increases as the vehicle
moves faster to give the PCM vehicle
speed information used to determine
shift points, engine load, and cruise
control functions.
WOT:
Wide-Open Throttle. The vehicle oper-
ating condition brought about when the
throttle is completely (or nearly) open.
The PCM will typically deliver extra fuel
to the engine and de-energize the A/C
compressor at this time for accelera-
tion purposes. The PCM uses a switch
or the Throttle Position Sensor to iden-
tify the WOT condition.