ACRONYMS (Reference)
Over the years the study of mechanics has gotten more and more technical and the need for acronyms to shorten the tongue twisting names of devices and concepts becomes necessary. After the USA created an agency called the EPA it become necessary to establish emission standards and those standards are there to keep car manufacturers and dealers from totally controlling the ability of independant repair shops to work on these cars an agreement called OBD2 created standard equipment including the datalink connectors, hardware, and then standard terminology for the cars devices. These became the official terms required by law. Break the emission rules and you might find the FBI giving you a call.

------------------   A  ------------------

AAC: Auxiliary Air Control the
AAV: Anti Afterburn Valve
ABS: Anti-lock Brake System
A/C: Air Conditioning
ACC: Accessory Position
ACL: Air Cleaner (Thermostatic Type)
ACM: Air Bag Control Module
ACR-4: Air Conditioning Refrigerant, Recovery,
      Recycling,  Recharging
ACT: Air Charge Temperature
A/D: Analog To Digital
AECM: Air Bag Electronic Control Module
A/F: Air/Fuel Ratio
AIR: Secondary Air Injection
AIRB: Secondary Air Injection Bypass
AIRD: Secondary Air Injection Diverter
AIS: Secondary Air Injection
AKI: Anti-Knock Index, federal law requires companies to
    rate their gasoline's volatility
ALDL: Assembly Line Diagnostic Link
AM1: Thermactor Air Management 1 (TAB)
AM2: Thermactor Air Management 2 (TAB Or TAD)
AP: Accelerator Pedal
API: American Petroleum Institute
APP: Accelerator Pedal Position
APS: Accelerator Position Sensor
ARS: Automatic Restraint System
ASD: Automatic Shutdown
ASDM: Air Bag System Diagnostic Module
ASR: Automatic Slip Regulation
A/T: Automatic Transaxle Or Transmission
ATC: Active Transfer Case
ATDC: After Top Dead Center

------------------   B  ------------------

BAP: Barometric Atmosphere Pressure
BAR: Bureau Of Auto Repair
BARO: Barometric Pressure
BBL: Barrel
BCM: Body Control Module
BID: Breakerless Inductive Discharge
BOB: Breakout Box
BOO: Brake On/Off
BP:Barometric Pressure
BPA: Bypass Air
BPT: Backpressure Transducer
BTDC: Before Top Dead Center
BVT: Backpressure Variable Transducer
B+: Battery Positive Voltage

------------------   C  ------------------

C: Continuous Memory
CA: California
CAB: Controller Anti-lock Brake
CAC: Charge Air Cooler
CANP: Canister Purge
CARB: California Air Resources Board
CARB: Carburetor
CAT: Catalytic Converter
CBD: Closed Bowl Distributor
CCA: Center Control Assembly
CCC: Converter Clutch Control Solenoid
CCCI: Computer Controlled Coil Ignition
CCD: Chrysler Collision Detection
CCD: Computer Controlled Dwell
CCECS: Computer Controlled Emission Control System
CCO: Converter Clutch Overdrive Solenoid
CCOT: Cycling Clutch Orifice Tube
CCP: Carbon Canister Purge
CCRM: Constant Control Relay Module
CEC: Computerized Emission Control System
CES: Clutch Engage Switch
CFRM: Condenser Fan Relay Module
CID: Cylinder Identification
CID: Cubic Inch Displacement
CIS: Constant Injection System
CIS-E: Constant Injection System Electronic
CKP: Crankshaft Position Sensor
CLECS: Closed Loop Emission Control System
CLFCS: Closed Loop Fuel Control System
CMFI: Central Multi-Port Fuel Injection
CMP: Camshaft Position Sensor
CMTC: Compass/Mini-Trip Computer
CNG: Compressed Natural Gas
CO: Carbon Monoxide
CO2: Carbon Dioxide
COP: Coil On Plug
CP: Canister Purge
CP: Crankshaft Position
CPP: Clutch Pedal Position
CPU: Central Processing Unit
CSF: Crankshaft Speed Fluctuation
CSFI: Central Sequential Fuel Injection
CTM: Central Timer Module
CTOX: Continuous Trap Oxidizer
CTP: Closed Throttle Position
CVVT: Continuous Variable Valve Timing
CYP: Cylinder Position
C3: Computer Command Control
C-4:Computer Controlled Catalytic Converter

------------------  D  ------------------

DAB: Driver Air Bag
DCL: Data Communications Link
DDS: Driveline Disengagement Switch
DEC: Diesel Engine Control
DERM: Diagnostic Energy Reserve Module
DFI: Digital Fuel Injection
DI: Distributor Ignition
DIC: Driver Information Center
DIS: Distributorless Ignition System
DIS: Direct Ignition System
DLC: Data Link Connector
DME: Digital Motor Electronics
DMIVA: Distributor Mounted Ignition Vacuum Advance
DOHC: Dual Overhead Camshaft
DPFE: Differential Pressure Feedback EGR
DPI: Dual Plug Ignition
DRB: Diagnostic Readout Box
DRB II:Diagnostic Readout Box II
DRB III: Diagnostic Readout Box III
DRL: Daytime Running Lamps
DS-I: Dura Spark I Ignition System
DS-II: Dura Spark II Ignition System
DSAS: Deceleration Spark Advance System
DSS: Downshift Solenoid
DTC: Diagnostic Trouble Code
DTM: Diagnostic Test Mode
DVOM:Digital Volt Ohm Meter

------------------  E  ------------------

EAIR: Electronic Secondary Air Injection
EAT: Electronically Controlled Automatic Transaxle Or Transmission
EBCM: Electronic Brake Control Module
EBL: Electric Back Lite (Rear Window Defroster)
EBP: Exhaust Back Pressure
ECA: Electronic Control Assembly
ECCS: Electronic Concentrated Engine Control System
ECITS: Electronic Control Ignition Timing System
ECL: Engine coolant Level
ECM: Engine Control Module
ECT: Engine Coolant Temperature
ECTF: Cooling Fan Engine Coolant Temperature
ECU: Engine Control Unit
EDF: Electro Drive Fan
EDFI: Electronic Diesel Fuel Injection
EDI: Electronic Controlled Direct Ignition System
EDIS: Electronic Distributorless Ignition System
EDL: Engine Data Line
EEC-I: Electronic Engine Control I
EEC-II: Electronic Engine Control II
EEC-III: Electronic Engine Control III
EEC-IV: Electronic Engine Control IV
EEC-V: Electronic Engine Control V
EEPROM: Electronically Erasable Programmable Read Only Memory
EET: Electronic EGR Transducer
EFC: Electronic Feedback Carburetor
EFE: Early Fuel Evaporation
EFI: Electronic Fuel Injection
EGO: Exhaust Gas Oxygen Sensor
EGR: Exhaust Gas Recirculation
EEGR: Electronic EGR Valve
EGRC: EGR Control
EGRT: EGR Temperature
EGRV: EGR Vent
EI: Electronic Ignition
EIC: Electronic Instrument Cluster
EICU: Electronic Ignition Control Unit
EITC: Electronic Ignition Timing Control
ELB: Electronic Lean Burn System
ELC: Electronic Level Control
ELCD: Evaporative Loss Control Device
ELD: Electric Load Detector
EMR: Electronic Module Retard
EOP: Engine Oil Pressure
EOT: Engine Oil Temperature
EPA: Environmental Protection Agency
EPC: Electronic Power Control
EPR: Exhaust Back Pressure Regulator
EPROM: Erasable Programmable Read Only Memory
EPT: EGR Pressure Transducer
ESA: Electronic Spark Advance
ESC: Electronic Spark Control
ESS: Engine Speed Sensor
EST: Electronic Spark Timing
ETC: Electronic Temperature Control
ETC: Electronic Throttle Control
ETCS-i: Electronic Throttle Control System-intelligent
ETW: Equivalent Test Weight
EVAP: Evaporative Emission Control System
EVIC: Electronic Vehicle Information Center
EVO: Electronic Variable Orifice
EVP: EGR Valve Position
EVR: EGR Vacuum Regulator
EVSV: Electronic Vacuum Switching Valve
EWL: Engine Warning Lamp
EZL:Electronic Ignition System With Variable Characteristics  

------------------   F  ------------------

FBC: Feedback Carburetor
FDCS: Fuel Demand Command Signal
FED: Federal
FEEPROM: Flash Electrically Erasable Programmable Read Only Memory
FEPROM: Flash Electrically Programmable Read Only Memory
FF: Flexible Fuel
FI:Fuel Injection
FMEM: Failure Mode Effects Management
FMI: Failure Mode Identifiers
FPM: Fuel Pump Monitor
FPCM: Fuel Injection Pump Control Module
FPRC: Fuel Pressure Regulator Control
FR: Fillpipe Restrictor
FSS: Flexible Service System

------------------   G  ------------------

GFD: Generic Field Data
GFP: Gaseous Fuel Prep
GPC: Glow Plug Control
GPL: Glow Plug Wait Lamp
GPM: Gallons Per Minute
gpm: Grams Per Million
GPR: Glow Plug Relay
GVW: Gross Vehicle Weight
GVWR: Gross Vehicle Weight Rating

------------------   H  ------------------

HC: Hydrocarbons
HCU: Hydraulic Control Unit
HD: Heavy Duty
HDC: Heavy Duty Emission Cycle
HE: Hall Effect
HEDF: High Electro Drive Fan
HEGO: Heated Exhaust Gas Oxygen Sensor
HEI: High Energy Ignition System
HEUI: Hydraulically Actuated Electronically Controlled Unit Injectors
HFAN: High Speed Cooling Fan
HFC: High Fan Control
HFM: Hot Film Air Mass Sensor
HO: High Output
HO2S: Heated Oxygen Sensor
HSC:High Swirl Combustion
HSIA: High Speed Inlet Air Control
HVAC: Heater Vent Air Conditioning
HVS: High Voltage Switch Ignition System

------------------   I  ------------------

IAC: Idle Air Control
IACV-AAC: Idle Air Control Valve-Auxiliary Air Control Valve
IAT: Intake Air Temperature
IC: Ignition Control
ICM: Ignition Control Module
ICP: Injector Control Pressure
ICS: Ignition Control System
ICTO: Ignition Coolant Temperature Override
IDI: Indirect Diesel Injection
IDI: Indirect Fuel Injection
IDM: Ignition Diagnostic Monitor
IDM: Injector Driver Module
ILEV: Inherently Low Emissions Vehicle
IMRC: Intake Manifold Runner Control
IMT: Intake Manifold Temperature
IOD: Ignition Current Off Draw
IPR: Injection Control Pressure Regulator
ISC: Idle Speed Control
ITS: Idle Tracking Switch
IVS: Idle Validation Switch

------------------   J  ------------------

JTEC: Jeep Truck Powertrain Control Module System

------------------   K  ------------------

KAM: Keep Alive Memory
KOEO: Key On Engine Off
KOER: Key On Engine Running
KS: Knock Sensor

------------------   L  ------------------

 LCD: Liquid Crystal Display
LDP: Leak Detection Pump
LED: Light Emitting Diode
LEV: Low Emissions Vehicle
LFAN: Low Speed Cooling Fan
LH: Lefthand
LPG: Liquid Propane Gas
LPT: Light Pressure Turbo
LUS: Lock-Up Solenoid
LVW: Loaded Vehicle Weight

------------------   M  ------------------

M/CCC: Modulated Converter Clutch Control
MAF: Mass Air Flow
MAP: Manifold Absolute Pressure
MAT: Manifold Air Temperature MC-VAF: Measuring Core Volume Air
Flow
MCC: Manifold Catalytic Converter
MCCA: Message Center Control Assembly
MCS: Mixture Control System
MCU: Microprocessor Control Unit
MDP: Manifold Differential Pressure
MEMCAL: Memory Calibration Unit
MFI: Multi-Port Fuel Injection
MIC: Mechanical Instrument Cluster
MID: Message Identifier
MIL: Malfunction Indicator Lamp
MPI: Multi-Port Injection
MLP: Manual Lever Position
MLUS: Modulator Lock-Up Solenoid
MST: Manifold Surface Temperature
M/T: Manual Transaxle Or Transmission
MTA: Managed Thermactor Air
MUI: Mechanical Unit Injection
MUT II: Multi-Use Tool, Second Edition

------------------   N  ------------------

NGS: New Generation Star Tester
NGV: Natural Gas Vehicle
NOx: Oxides Of Nitrogen
NVRAM: Non Volatile Random Access Memory

------------------   O  ------------------

O: Key On Engine Off
OBD: On-Board Diagnosis
OBD II: On-Board Diagnosis II
OC: Oxidation Catalytic Converter
OCC: Output Circuit Check
ODO: Odometer
ODM: Output Driver Module
OHC: Overhead Cam
ORVR: On Board Refueling Vapor Recovery
OSAC: Orifice Spark Advance Control
OSC: Output State Control
OSS: Output Shaft
OSS: Output Speed Sensor
OTIS: Overhead Travel Information System
OWL: Oil/Water Warning Lamp
O2S: Oxygen Sensor

------------------   P  ------------------
PAB: Passenger Air Bag
PAD: Passenger Air Bag Disable
PAG: Polyalkaline Glycol
PAIR: Pulsed Secondary Air Injection
PCI: Programmable Communication Interface
PCM: Powertrain Control Module
PCV: Positive Crankcase Ventilation
PDC: Power Distribution Center
PFE: Pressure Feedback EGR
PG: Pulse Generator
PGM-CARB: Programmed Carburetor
PGM-FI: Programmed Fuel Injection Control System
PGM-IG: Programmed Ignition
PID: Parameter Identifier
PIP: Profile Ignition Pickup
PNP: Park/Neutral Position
ppm: Parts Per Million
PRC: Pressure Regulator Control
PROM: Programmable Read Only Memory
PSI: Pounds Per Square Inch
PSP: Power Steering Pressure
PSPS: Power Steering Pressure Switch
PTEC: Powertrain Electronic Controller Management System
PTO: Power Take Off
PWM: Pulse Width Modulated

------------------   R  ------------------

R: Key On Engine Running
RABS: Rear Anti-lock Braking System
RAM: Random Access Memory
RAP:Retained Accessory Power
RDS: Radio Data System
REDOX: Reduction Oxidation Catalytic Converter
RFI: Radio Frequency Interference
RH: Righthand
RKE: Remote Keyless Entry
ROM:Read Only Memory
RON: Research Octane Number
RPM: Revolutions Per Minute
RPS: Revolutions Per Second
REDOX: Reduction Oxidation Catalytic Converter
REGT: Recirculated Exhaust Gas Temperature

------------------   S  ------------------

SAW: Spark Angle Word
SBEC: Single Board Engine Control
SC: Supercharger
SCC: Spark Control Computer
SCCS: Speed Control Command Switches
SCS: Speed Controlled Spark
SFI: Sequential Multi-Port Fuel Injection
SFTP: Supplementary Federal Test Procedure
SHO: Super High Output
SID: Subsystem Identifier
SIL: Shift Indicator Lamp
SKIM: Smart Key Immobilizer Module
SMEC: Single Module Engine Control
SOHC: Single Overhead Camshaft
SO2: Sulfur Dioxide
SPCS: Spark Plug Switching Control System
SPI: Serial Peripheral Interface
SPK: Spark Control
SPOUT: Spark Output
SRI: Service Reminder Indicator
SRS: Supplemental Restraint System
SS: Shift Solenoid
SSI: Solid State Ignition
SST: Special Service Tool
STAR: Self-Test Automatic Readout
STC: Spark Timing Control
STI: Self-Test Input
STO: Self-Test Output
SULEV: Super Ultra Low Emissions Vehicle
SVO: Special Vehicle Operations
SVT: Special Vehicle Team

------------------   T  ------------------

TAB: Thermactor Air Bypass Vacuum Solenoid Valve
TAC: Tachometer Output Signal
TAD: Thermactor Air Diverter Vacuum Solenoid Valve
TBI: Throttle Body Fuel Injection
TC: Turbocharger
TCC: Torque Converter Clutch
TCS: Transmission Controlled Spark
TDC: Top Dead Center
TFI-I: Thick Film I Ignition System
TFI-IV: Thick Film IV Ignition System
TFT: Transmission Fluid Temperature
TI Transistor Ignition System
TLEV: Transitional Low Emission Vehicle
TOT: Transmission Oil Temperature
TP: Throttle Position
TP: Throttle Positioner
TPI: Tuned Port Injection
TPOUT: Throttle Position Output
TRS: Transmission regulated Spark
TPS: Throttle Position Sensor
TSB: Technical Service Bulletin
TSS: Transmission Speed Sensor
TSS: Turbine Speed Sensor
TTS: Transaxle Temperature Switch
TV: Throttle Valve
TVP: Throttle Valve Potentiometer
TVV: Thermal Vacuum Valve
TWC: Three-Way Catalytic Converter
TWC+OC: Three-Way + Oxidation Catalytic Converter

------------------   U  ------------------

UIC: Universal Integrated Circuit Ignition
ULEV: Ultra Low Emissions Vehicle
UVC: Under Valve Cover

------------------   V  ------------------

VAF: Vane Air Flow
VAF: Volume Air Flow
VANOS: Double Variable Camshaft Control
VAT: Vane Air Temperature
VCM: Vehicle Control Module
VCRM: Variable Control Relay Module
VDV: Vacuum Delay Valve
VEPS: Vehicle Electronic Programming System
VFD: Vacuum Fluorescent Display
VIC: Vehicle Information Center
VICS: Variable Inertia Charging System
VIN: Vehicle Identification Number
VIT: Vehicle Interface Tool
VPM: Vehicle Personality Module
VP-20: Bosch VP-20 Diesel Engine Control System
VRE: Vehicle Retarder Enable
VREF: Reference Voltage
VRV: Vacuum Regulator Valve
VSS: Vehicle Speed Sensor
VTEC: Variable Valve Timing & Valve Lift Electronic Control
VTSS: Vehicle Theft Security System
VVTi: Variable Valve Timing With Intelligence

------------------   W  ------------------

WAC: Wide Open Throttle A/C Cutoff
WOT: Wide Open Throttle
WOTPS: Wide Open Throttle Position Switch
WSS: Wheel Speed Sensor
WU-OC: Warm-Up Oxidation Catalytic Converter
WU-TWC: Warm-Up Three-Way Catalytic Converter

------------------   XYZ  ------------------
X: Equipped
ZEV: Zero Emissions Vehicle
1 BBL: 1 Barrel Carburetor
2 BBL: 2 Barrel Carburetor
3 BBL:3 Barrel Carburetor
4 BBL: 4 Barrel Carburetor
2 VH: 2 Valve Head
4 VH: 4 Valve Head
—: Not Equipped

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