Actron Ford Code Scanner CP9015 - Manual (Page 57)

57
REFERENCE GLOSSARY
A/C
Air conditioner
ACC
Air Conditioner Clutch
signal. This tells the ECA
that either the A/C
compressor is running or
that A/C operation is being
requested (depends upon
vehicle).
ACT
Air Charge Temperature
sensor. This sensor is a
thermistor – a resistor
whose resistance
decreases with
temperature. It is threaded
into the intake manifold so
the ECA can determine the
temperature of the
incoming air. This is used
for fuel delivery
calculations.
Actuator
Devices which are powered
by the ECA to control
things. Actuator types
include relays, solenoids
and motors. Actuators allow
the ECA to control engine
operation.
A/F
Air/fuel.
AM-1
Air Management solenoid
#1. Also called TAB
solenoid. (See TAB for
explanation.)
AM-2
Air Management solenoid
#2. Also called TAD
solenoid.
(See TAD definition.)
AXOD
Automatic Transaxle with
Overdrive gear.
BOO
Brake On-Off switch signal.
Tells the ECA when the
brakes are being applied.
BP
Barometric Pressure
sensor. (See MAP
definition.)
CANP
Canister Purge solenoid.
This device controls the
flow of fuel vapors from the
canister to the intake
manifold. The canister
collects vapors evaporating
from the fuel tank,
preventing them from
escaping into the
atmosphere. During warm
engine cruise conditions,
the ECA energizes CANP
so the trapped vapors are
drawn into the engine and
burned.
CCC
Converter Clutch solenoid.
Located in certain
electronically controlled
transmissions. The ECA
uses this solenoid to
control the lock-up clutch in
the torque converter. The
ECA will engage or release
lock-up depending upon
engine operation.
CCS
Coast Clutch Solenoid.
Located in certain
electronically controlled
transmissions. The ECA
uses this solenoid to permit
engine braking during
deceleration when in third
gear (with gear shift lever in
Drive).
CCO
Converter Clutch Override
solenoid. Located inside
transmission having
mechanically controlled
lock-up torque converter.
The ECA uses this solenoid
to disable lock-up under
certain engine operating
conditions.
CFI
Central Fuel Injection. A
fuel injection system having
one (or two) injectors
mounted in a centrally
located throttle body, as
opposed to positioning the
injectors close to an intake
valve port.
CID
Cylinder Identification signal.
This is a frequency type
signal coming from a
camshaft mounted sensor.
The ECA uses this signal to
reference fuel injector
operation and synchronize
spark plug firing on
distributorless ignitions.
Closed Loop (C/L)
This is when a control
system performs an action
(expecting a certain result),
then checks the results and
corrects its actions (if
necessary) until the desired
results are achieved.
Example: The ECA pulses a
fuel injector expecting a
certain amount of fuel to be
delivered. In closed loop
operation, the ECA uses a
sensor to check the actual
amount of fuel delivered.
The ECA will correct the
injector pulse width as
necessary to obtain the
desired fuel delivery.
Continuity
An unbroken, continuous
circuit through which an
electric current can flow.
Coolant
Temperature
Switches
Used on MCU systems.
These are vacuum controlled
electrical switches which
signal various engine
operating temperatures to
the MCU module. A ported
vacuum switch is used along
with the temperature
switches. The normally
closed ported vacuum
switches open at a specific
temperature and allow
vacuum to pass. This
vacuum then causes the
temperature switches to
switch and send a signal to
the MCU module. Some
MCU systems use a single
Low Temperature Switch to
tell the MCU module when
the engine has warmed up.
Other MCU systems use two
switches: one for mid
temperature and a second
for high/low temperatures
(the switch will signal when
the temperature is either too
high or too low). The MCU
module uses temperature