User guide

AutoEnginuity ScanTool User Guide 49
Appendix B: Engine Terminology
Absolute Throttle Position Sensor
A sensor that reads the throttle opening. Throttle position at idle
will usually indicate greater than 0%. Throttle position at wide open
throttle (WOT) will usually indicate less than or equal to 100%.
Air Conditioning System Refrigerant Monitor
This non-continuous monitor checks the functioning of R-12 air
conditioning systems. Note: air conditioning systems that use R-
134 are not required to implement this monitor.
Ambient Temperature Sensor
A sensor that measures the temperature of the air outside the engine
compartment.
Bank
The group of cylinders which feed an oxygen sensor. Bank 1 con-
tains the number 1 cylinder.
Calculated Load Value
An indication of the current airflow divided by peak airflow, where
peak airflow is corrected for altitude, if available. Mass airflow and
barometric pressure sensors are not required for this calculation.
This definition provides a unitless number that is not engine spe-
cific, and provides the service technician with an indication of the
percentage of engine capacity that is being used (with wide open
throttle being 100%).
Cam Position Sensor
The position of a specific camshaft. This can be determined directly
by using magnetic or optical sensors, or indirectly by computing it
from the crankshaft. See also Crankshaft.
CAT or Catalytic Converter
Burns off any unburned fuel (hydrocarbons-HC) or partially burned
fuel (carbon monoxide-CO) through simple chemical reactions