User Manual

Glossary • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
B – 2 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
B
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):
Connector providing access and/or
control of the vehicle information,
operating conditions, 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.
Detonation:
See Knock.
DI/DIS:
Direct Ignition/Distributorless Ignition
System. A system that produces the
ignition spark without the use of a
distributor.
DPFE:
Differential Pressure Feedback – Exhaust
Gas Recirculation Sensor
DTC:
Diagnostic Trouble Code. An
alphanumeric identifier for a fault
condition identified by the On Board
Diagnostic System.
Duty Cycle:
A term applied to signals that switch
between “on” and “off”. Duty cycle is the
percentage of time the signal is “on”. For
example, if the signal is “on” only one
fourth of the time, then the duty cycle is
25%. The PCM uses duty cycle type
signals to maintain precise control of an
actuator.
EBCM:
Electronic Brake Control Module
EBTCM:
Electronic Brake/Traction Control Module
ECM
Engine Control Module or Electronic
Control Module
ECT:
Engine Coolant Temperature sensor. See
CTS.
EEPROM:
Electrically Erasable Programmable Read
Only Memory
EFE:
Early Fuel Evaporation
EFI:
Electronic Fuel Injection. Any system
where a computer controls fuel delivery to
the engine by using fuel injectors.
EGR:
Exhaust Gas Recirculation. The PCM
uses the EGR system to recirculate
exhaust gases back into the intake
manifold to reduce emissions. EGR
Recirculation is used only during warm
engine cruise conditions. EGR flow at
other times can cause stalling or no
starts.