Actron Professional Enhanced Scan Tool 9640A User Manual page 118

Glossary
Boost Control Solenoid:
A solenoid that is energized by the PCM, in order to control supercharger boost pressure.
Brake Switch Signal:
An input signal to the PCM indicating that the brake pedal is being pressed. This signal
is typically used to disengage Cruise Control systems and Torque Converter Clutch
(TCC) solenoids. See also TCC.
CAM:
Camshaft Position Sensor. Sends a frequency signal to the PCM in order to synchronize
fuel injector and spark plug firing.
CAN:
Controller Area Network
CARB:
California Air Resources Board. Governing body for emissions control in California.
CKP REF:
Crankshaft Position Reference.
CKP:
Crankshaft Position. See CPS.
Closed Loop (CL):
A feedback system that uses the O2 Sensor(s) to monitor the results of combustion.
Based on the signal(s) from the O2 sensor(s), the PCM modifies the air/fuel mixture to
maintain optimum performance with lowest emissions. In closed loop mode, the PCM
can "fine tune" control of a system to achieve an exact result.
CMP:
Camshaft Position Sensor
CO:
Carbon Monoxide
Continuous Memory Codes:
See Pending Codes.
CPS:
Crankshaft Position Sensor. Sends a frequency signal to the PCM. It is used to reference
fuel injector operation and synchronize spark plug firing on distributorless ignition
systems (DIS).
CTS:
Coolant Temperature Sensor. A resistance sensor that sends a voltage signal to the PCM
indicating the temperature of the coolant. This signal tells the PCM whether the engine
is "cold" or "warm".
CVRTD:
Continuous Variable Real Time Damping
D/R:
Drive/Reverse
Data Link Connector (DLC):
B
Connector providing access and/or control of the vehicle information, operating condi-
tions, and diagnostic information. Vehicles with OBD II use a 16-pin connector located
in the passenger compartment.
Data Stream:
The actual data communications sent from the vehicle's PCM to the data connector.
DEPS:
Digital Engine Position Sensor.
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