User Manual

573904 | REV. B | 03.2016
Bosch Automotive Service Solutions Inc.
CP9670 AutoScanner®
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User guide | 37
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en
8 Appendix B—Glossary
A/C:
Air conditioner
A/D:
Analog to digital
A/F:
Air/Fuel ratio. The proportion of air and fuel delivered to
the cylinder for combustion. For example, an A/F ratio of
14:1 denotes 14 times as much air as fuel in the mixture.
Ideally the A/F ratio is 14.7:1.
ABS:
Anti-lock crake system
A/C clutch relay:
The PCM uses this relay to energize the A/C clutch,
turning the A/C compressor on or off.
A/C pressure sensor:
Measures air conditioning refrigerant pressure and
sends a voltage signal to the PCM.
A/C pressure switch:
A mechanical switch connected to the A/C refrigerant
line. The switch is activated (sending a signal to the
PCM) when the A/C refrigerant pressure becomes too
low or high.
Actuator:
Actuators such as relays, solenoids, and motors allow
the PCM to control the operation of vehicle systems.
Air Injection Reaction (AIR) System:
An emission control system operated by the PCM. Dur-
ing cold starts, an air pump injects outside air into the
exhaust manifold to help burn hot exhaust gases. This
reduces pollution and speeds warm-up of oxygen sen-
sors and catalytic converters. After the engine is warm,
the air will either be dumped back to the atmosphere (or
into the air cleaner assembly) or sent to the catalytic
converter.
APP:
Acceleration pedal position (sensor)
ASR:
Acceleration slip regulation
Bank x:
The standard way of referring to the bank of cylinders
containing cylinder #x. In-line engines have only one
bank of cylinders. Most commonly used to identify the
location of oxygen sensors. See O2S, Sensor x, Sensor
x.
BARO:
Barometric pressure sensor. See MAP sensor.
BBV:
Brake boost vacuum (sensor)
BCM:
Body control module
Boost control solenoid:
A solenoid that is energized by the PCM, in order to
control turbo/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 to synchronize fuel injector and spark plug
firing.
Catalytic converter:
Designed to reduce exhaust emissions.
CAN:
Controller area network
CARB:
California air resources board. Governing body for emis-
sions control in California.
CKP REF:
Crankshaft position reference.
CKP:
Crankshaft position. See CPS.
CKT:
Circuit
Closed loop (CL):
A feedback system that uses the O2 Sensor(s) to moni-
tor 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; odorless gas produced by incomplete
combustion.
Code scanner:
A device that interfaces with and communicates informa-
tion via a data link.
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 tem-
perature 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):