Actron CP9035 Insrucciones página 43

supplying power to the Torque Con-
verter Clutch (TCC) solenoid. This
connection insures the TCC solenoid
will disengage when the brake pedal is
depressed. Also see "TCC" definition.
CAM:
Camshaft Position Sensor. This sensor
sends a frequency signal to the PCM.
Vehicles with sequential fuel injection
(SFI) use this signal to synchronize the
injector firing order. Some DIS type
ignition systems use this signal to
synchronize spark plug firing.
CKP REF:
Crankshaft Reference.
CKP:
Crankshaft Position Sensor.
Closed Loop (C/L):
This is when a control system per-
forms an action (expecting a certain
result), then checks the results and
corrects its actions (if necessary) until
the desired results are achieved.
Example: Fuel delivery. The PCM
operates a fuel injector in a way that
should deliver an optimum air/fuel
mixture, as long as everything in the
fuel system is operating as expected.
In closed loop operation, the PCM uses
the oxygen sensor to check the results
(fuel delivery may be different than
expected because of variations in fuel
pressure or injector operation). If the
oxygen sensor indicates a "rich"
condition, the PCM will compensate by
reducing fuel delivery until the oxygen
sensor signals an optimum air/fuel
mixture. Likewise, the PCM will
compensate for a "lean" condition by
adding fuel until the oxygen sensor
once again signals an optimum air/fuel
mixture. Thus, closed loop operation
means the PCM can "fine tune" control
of a system to achieve an exact result
providing the PCM has a means to
check results (like an oxygen sensor).
CO:
REFERENCE GLOSSARY
Carbon Monoxide
CPS:
Crankshaft Position Sensor. This 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 thermistor
— a sensor whose resistance decreases
with increases in temperature — is
threaded into the engine block, contacting
the engine coolant. It sends a voltage
signal to the PCM indicating the tempera-
ture of the coolant. The PCM uses this
signal for control of fuel delivery, spark
advance, and EGR flow.
Data Link Connector (DLC):
The Data Link Connector (DLC) is a
universal term for the interface port
between the vehicle's on-board computer
and a diagnostic tool. All vehicles with
OBD II use a 16-pin connector located in
the passenger compartment.
Data Stream:
This is the actual data communications
broadcast from the vehicle's PCM to the
data connector. The individual manufactur-
ers determine the number of "data bytes"
a specific engine will broadcast. The size
of the data stream is usually dependent on
the complexity of the engine, transmis-
sion, ABS, and other systems supported
by the PCM. All manufacturers supply
program documents for each year, engine,
and option combination that a particular
PCM supports in all the manufacturer's
vehicles. This information is used to
design and build aftermarket diagnostic
equipment.
DEPS:
Digital Engine Position Sensor.
Detonation:
Uncontrolled ignition of the air/fuel mixture
in the cylinder. Also referred to as "knock,"
8-2