User guide

AutoEnginuity ScanTool User Guide 51
Comprehensive Component Monitor
A continuously run monitor that performs checks on the OBD-II
sensors, actuators, and switches. The current values are compared
against "known-good" values to determine if the sensor, actuator, or
switch is functional and is rationally operating.
Crankshaft Position Sensor
The crankshaft position sensor has many other tasks besides telling
the engine computer what position the crankshaft is in. This sensor
is also used to determine the speed of the engine, and it is used to
determine if the engine misfired.
DLC or Data Link Connector
The OBD-II standard physical connector on the vehicle side. This
16-pin female connector mates to the scan tool.
DTC or Diagnostic Trouble Code
Diagnostic Trouble Code are how OBD-II identifies and
communicates to technicians about what on-board problems exist.
The first number in the DTC indicates whether the code is an SAE
standard code (applies to all OBD-II systems) or is specific to the
vehicle manufacturer. The remaining three numbers provide
information regarding the specific vehicle system and circuit.
Drive Cycle
A series of conditions required before all non-continuous system
monitors can complete their tests. Some drive cycle requirements
are manufacturer specific and involve such things as certain ambi-
ent temperatures, as well as driving conditions. See Appendix C for
further details. See also Trip.
Emissions
Byproducts of the combustion engine that are regulated by the
Environmental Protection Agency (EPA). Modern vehicles must be
able to reduce emissions to a federally regulated level to be able to
operate on United States roadways. Three exhaust gases are specifi-
cally regulated: HC, CO, and NO.
ETS or Engine Temperature Sensor
Measure of the engine’s internal temperature.