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C
Carbon
C
Celsius
C.A.R.B.
California Air Resource Board
C3
Computer Command Control System (GM)
C3I
Computer Controlled Coil Ignition. Produces ignition spark without aid of an ignition distributor.
C4
Computer Controlled Catalytic Converter System (GM)
CAC
Charge Air Cooler
CALIBRATION
The act of adjusting or verifying test instrument accuracy in relation to the graduations used on the instrument.
CANISTER
A charcoal-filled container in an evaporative emission control system which traps vapors from the fuel system.
CANISTER PURGE CONTROL VALVE (CPCV)
A vacuum-operated valve which controls the flow of vapors from the canister to the engine. At engine temperatures below 145øF (61øC), the vehicle's on-board computer de-energizes the solenoid to allow vacuum to flow to the purge valve; the valve then purges fuel vapors through the throttle body.
CANISTER PURGE SOLENOID
Electrical solenoid or its control line. Solenoid opens a valve from fuel vapor canister line to intake manifold when energized. Controls flow of vapors between carburetor bowl vent and carbon canister.
CANP
EVAP Canister Purge Solenoid
CAPACITANCE
The property of a condenser (capacitor) which enables it to hold an electric charge.
CAPACITOR
A device capable of storing an electric charge.
CAPACITY
The amount of electricity which can be delivered, under specific conditions, at a given rate of discharge. Capacity is generally specified in amp-hours.
CARB
Carburetor
CARB
California Air Resources Board
CAS
Clean Air System
CAS
Crank Angle Sensor
CASE
Cranking Angle Sensing Error
CATALYTIC CONVERTER
Muffler like assembly placed in exhaust system that contains a catalyst to change hydrocarbons and carbon monoxide into water vapor and carbon dioxide.
CBD
Closed Bowl Distributor
CC
Cruise Control
CC
Cubic Centimeters
CC
Climate Control
CC
Catalytic Converter
CCC
COMBUSTION CONTROL COMPUTER
CCC
Converter Clutch Control solenoid or its circuit.
CCC
Computer Command Control System (GM)
CCD
Computer Controlled Dwell, used on Ford Vehicles.
CCD
Chrysler Collision Detection
CCD BUS
A communication line used by various on-board computers for the transmission of data.
CCDIC
Climate Control Driver Information Center
CCEI
Coolant Controlled Idle Enrichment (Chrysler)
CCEV
Coolant Controlled Engine Vacuum Switch (Chrysler)
CCM
Central Control Module
CCM
Continuous Component Monitor
CCNT, DTC CCNT
Count Code
CCO
Converter Clutch Override
CCOT
Cycling Clutch Orifice Tube
CCP
Controlled Canister Purge (GM)
CCP
Climate Control Panel
CCRM
Constant Control Relay Module
CCS
Coast Clutch Solenoid
CCSP
Carbon Canister Storage/Purge
CCV
Canister Control Valve
CDCV
Canister Drain Cut Valve
CDI
Capacitor Discharge Ignition (AMC)
CDR
Chrysler Diagnostic Readout
CDRV
Crankcase Depression Regulator Valve
CE
Commutator End
CEAB
Cold Engine Air Bleed
CEC
Crankcase Emission Control System (Honda)
CECU
Central Electronic Control Unit (Nissan)
CEL
Check Engine Light
Central Fuel Injection
Ford brand name for Throttle body Fuel Injection.
CENTRAL FUEL INJECTION
Computer control fuel injection at throttle body, used on Fords, same as throttle body injection.
CER
Cold Enrichment Rod (Ford)
CES
Clutch Engage Switch
CESS
Cold Engine Sensor Switch
CFC
Chlorofluorocarbons
CFI
Continuous Fuel Injection
CFI
Central Fuel Injection
CFM
Cubic Feet Per Minute
CFV
Critical Flow Venturi
CHARGE
Any condition where electricity is available. Also describes the process of restoring the active materials in a battery cell by electrically reversing the chemical action.
CHARGE TEMPERATURE SENSOR
A thermistor (temperature-controlled variable resistor) which provides varying voltage signals, in proportion to intake manifold air temperature, to the vehicle's on-board computer. The computer uses this signal to control the air switching, EGR and spark advance systems.
CHARGE TEMPERATURE SWITCH
An "ON-OFF" switch which controls EGR flow (closed = no flow permitted, open = flow permitted).
CHARGING VOLTAGE
The voltage present at the alternator output.
CHECK ENGINE LIGHT
Instrument panel light used either to aid in identification and diagnosis of malfunctions, or to indicate maintenance is required.
CHECK VALVE
A one-way valve which allows vacuum or gas flow in one direction only.
CHM
Cold Mixture Heater
CID
Cylinder Identification sensor or its circuit.
CID
Cubic Inch Displacement
CIRCUIT
An arrangement of conductors and components through which current can flow.
CIRCUIT BREAKER
A device (other than a fuse) which interrupts current flow in a circuit under abnormal conditions.
CIS
Continuous Injection System (Bosch)
CKP
Crankshaft Position Sensor
CKP REF
Crankshaft Position Reference
CKT
Circuit
CL
Closed Loop
CLC
Converter Lockup Clutch (replaced with TCC)
CLCC
Closed Loop Carburetor Control
CLNT
Coolant
CLOSED CIRCUIT
An uninterrupted path beginning at the current source and returning to the current source.
CLOSED LOOP
A circuit in which the output of an electronic control is measured by a sensor and is returned to the control to indicate if the output is optimum or excessive.
CLV
Calculated Load Value
CMFI
Central Multi-port Fuel Injection
CMP
Camshaft Position Sensor
CMP REF
Camshaft Position Reference
CO
Carbon Monoxide
CO2
Carbon Dioxide
COC
Conventional Oxidation Catalyst (Ford)
COC (CONVENTIONAL OXIDATION CATALYST)
Component of an emission control system which acts on the pollutants HC and CO.
COMBUSTION CONTROL COMPUTER
A computer control system used on 1981-83 Imperial models with electronic fuel injection to control fuel injection, spark timing and advance, idle speed, air injection switching, and fuel evaporation purging.
COMMON POINT
A terminal or connection where two parallel circuits or components are joined.
Computer Control System
An electronic control system, consisting of an on-board computer and related sensors, switches and actuators, used to ensure peak performance and fuel efficiency while reducing pollutants in the vehicle's emissions.
COMPUTER TIMING
Total spark advance in degrees before top dead center. Calculated by Ford EEC-IV processor, based on sensor input.
CONDENSER
A device capable of storing an electric charge.
CONDUCTOR
Any material or substance (solid, liquid or gas) capable of transmitting electricity.
CONNECTOR
A mechanical device used to connect the components of an electrical circuit together.
CONTINUITY
A condition where a circuit, or part of a circuit is closed or continuous between given points.
CONTINUOUS SELF-TEST
Continuous test of Ford EEC-IV system conducted whenever vehicle is in operation.
CONTROLLER
Generic name for an on-board solid state microcomputer which monitors engine conditions and controls certain engine functions. Specific computers such as ECU, Power Module, Logic Module, SBEC and SMEC are generically referred to as controllers.
Converter Clutch Override
Output from the computer processor to the transmission.
COOLANT TEMPERATURE SENSOR (CTS)
A thermistor (temperature-controlled variable resistor) which provides varying voltage, in proportion to engine coolant temperature, to the vehicle's on-board computer.
COOLANT TEMPERATURE SWITCH
An "ON-OFF" switch which measures the engine coolant temperature and transmits the information on to the vehicle's on-board computer. The coolant temperature switch is closed when engine coolant is cold.
COOLANT VACUUM SWITCH COLD CLOSED (CVSCC)
A switch mounted in the thermostat housing, which closes when coolant temperature is cold, to prevent EGR flow. The switch opens when coolant temperature is warm, to allow EGR flow.
COOLANT VACUUM SWITCH COLD OPEN (CVSCO)
A switch mounted in the thermostat housing, which opens when coolant temperature is cold, to allow manifold vacuum into the air delivery switching system. The switch closes when coolant temperature is warm, to prevent manifold vacuum from entering the air delivery switching system.
COP
Coil On Plug Electronic Ignition
CORE
The center conductor part of a wire, or the iron magnetic material of a solenoid magnet.
CP
Canister Purge (GM)
CP
Crankshaft Position Sensor (Ford)
CPA
Connector Position Assurance
CPI
Central Port Fuel Injection
CPP
Clutch Pedal Position
CPS
Central Power Supply
CPS
Crankshaft Position Sensor. Provides the ECU with engine speed and crankshaft angle (position).
CPSOV
Canister Purge Shut Off Valve (Ford)
CPU
Central Processing Unit
Crankshaft Position Sensor
Provides the ECU with engine speed and crankshaft angle (position).
CRK
Cranking Signal
CROSS-CIRCUIT SHORT
A current flow path between the hot wires in two different circuits.
CRT
Cathode Ray Tube
CSC
Coolant Spark Control (Ford)
CSE GND
PCM Case Ground
CSSA
Cold Start Spark Advance System (Ford)
CSSH
Cold Start Spark Hold System (Ford)
CTAV
Cold Temperature Actuated Vacuum Switch (Ford)
CTM
Central Timer Module
CTO
Clean Tachometer Output
CTO
Coolant Temperature Override
CTOX
Continuous Trap Oxidizer
CTP
Closed Throttle Position
CTS
Charge Temperature Switch (Chrysler)
CTS
Coolant Temperature Sensor.
CTVS
Closed Throttle Vacuum Switch
CURB IDLE
Computer controlled idle rpm.
CURRENT
The movement of electrons through a conductor material.
CURRENT-LIMITING RESISTOR
A resistor in a circuit to which limits the current.
CV
Control Valve
CV
Constant Velocity
CVCC
Compound Vortex Controlled Combustion System (Honda)
CVR
Control Vacuum Regulator (Ford)
CVS
Constant Volume Sampler
CWM-Ford
Cold Weather Modulator (Ford)
CYCLE
A complete alternation in an alternating current.
CYLINDER IDENTIFICATION SIGNAL (CID)
A signal generated by crankshaft timing sensor, used to synchronize ignition coils, due to the fact that some models use a 2 ignition coil pack DIS system.
