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Truck Industry Acronyms Explained

In the heavy truck industry common acronyms like DPF, DTC, and ECM get thrown around every day. Whether you are reading a blog post, researching capabilities of a diagnostic tool, flipping through an OEM manual, or deciphering a wiring diagram, you are bound to come across one of the hundreds of different acronyms that populate this industry. With so many acronyms, it is nearly impossible to know them all. In this blog post, the team at Diesel Laptops has compiled a list of more than 900 industry acronyms that should help eliminate any confusion going forward no matter what type of heavy truck document you are reading.

Be sure to bookmark this page so you can quickly refer back to it...

Truck Industry Acronyms

1 BBL
1 Barrel Carburetor
2 BBL
2 Barrel Carburetor
2 VH
2 Valve Head
3 BBL
3 Barrel Carburetor
4 BBL
4 Barrel Carburetor
4 VH
4 Valve Head
A/C
Air Conditioning
A/D
Analog To Digital
A/F
Air/Fuel Ratio
A/T
Automatic Transaxle
A/T
Automatic Transmission
AAC
Auxiliary Air Control
AAT
Ambient Air Temperature
AAV
Anti Afterburn Valve
ABS
Anti-Lock Brake System
ACC
Accessory Key Position
ACERT
Advanced Combustion Emissions Reduction Technology
ACL
Air Cleaner
ACM
Air Bag Control Module
ACR-4
Air Conditioning Refrigerant, Recovery, Recycling, Recharging
ACT
Air Charge Temperature
ADSTWC
Adsorbing Twc
AECM
Air Bag Electronic Control Module
AFC
Air Flow Control
AFR
Air Filter Restriction
AFR
Air Fuel Ratio
AFRC
Air Fuel Ratio Control
AFS
Air-Fuel Ratio Sensor
AFT
Aftertreatment
AIH
Air Intake Heaters
AIR
Secondary Air Injection
AIR/AIRE
Secondary Air Injection (Belt Driven) / (Electric Driven)
AIRB
Secondary Air Injection Bypass
AIRD
Secondary Air Injection Diverter
AIS
Secondary Air Injection
AIT
Air Intake Temperature
ALDL
Assembly Line Diagnostic Link
ALSG
Automotive Limiting Speed Governor
ALVW
Adjusted Lvw
AM1
Thermactor Air Management 1 (Tab)
AM2
Thermactor Air Management 2 (Tab Or Tad)
AMS
Air Management System
AP
Accelerator Pedal
API
American Petroleum Institute
APK
Accelerator Pedal Kickdown
APP
Accelerator Pedal Position
APPS
Accelerator Pedal Position Sensor, Sometimes Simply Accelerator Position Sensor
APS
Accelerator Position Sensor
ARS
Automatic Restraint System
ASD
Automatic Shutdown
ASDM
Air Bag System Diagnostic Module
ASET
Application Specific Engine Technology
ASR
Automatic Slip Regulation
ATC
Active Transfer Case
ATDC
After Top Dead Center
AUXP
Auxiliary Pressure
AUXT
Auxiliary Temperature
AWL
Amber Warning Lamp
B+
Battery Positive Voltage
B10
Method Of Approximating Diesel Engine Service Life, See What Is B10 And B50 Life.
B20
Common Biodiesel Blend; 20% Biodiesel, 80% Petroleum Diesel.
B5
Common Biodiesel Blend; 5% Biodiesel, 95% Petroleum Diesel.
B50
Method Of Approximating Diesel Engine Service Life, See What Is B10 And B50 Life.
BAP
Barometric Atmosphere Pressure
BAR
Bureau Of Auto Repair
BARO
Barometric Absolute Pressure
BBL
Barrel
BCAN
Bleed Carbon Canister
BCM
Body Control Module
BCP
Brake Control Pressure
BCS
Boost Control Solenoid
BID
Breakerless Inductive Discharge
BOB
Breakout Box
BOO
Brake On/Off
BP
Barometric Pressure
BPA
Bypass Air
BPP
Brake Pedal Position
BPS
Brake Pressure Switch
BPT
Backpressure Transducer
BSV
Brake Shut-Off Valve
BTDC
Before Top Dead Center
BVT
Backpressure Variable Transducer
BW
Borgwarner, Popular Transfer Case Manufacturer And Drivetrain Component Supplier For Various Automakers.
C
Continuous Memory
C
Celsius
C3
Computer Command Control
C-4
Computer Controlled Catalytic Converter
CA
California
CAB
Controller Anti-Lock Brake
CAC
Charge Air Cooler, Synonymous With Intercooler Or Aftercooler.
CACOT
Charge Air Cooler Outlet Temperature Can
CAN
Controller Area Network, Protocol For Diagnostic Systems
CAN-H
Controller Area Network High
CAN-L
Controller Area Network Low
CANP
Canister Purge
CAP
Cold Ambient Protection
CARB
California Air Resources Board
CARB
Carburetor
CAT
Catalytic Converter
CB
Crankcase Breather
CBD
Closed Bowl Distributor
CC
Cubic Centimeter
CCA
Center Control Assembly
CCA
Cold Cranking Ampere
CCB
Crankcase Breather
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
CCOSS
Crankcase Oil Separator Speed
CCOT
Cycling Clutch Orifice Tube
CCP
Carbon Canister Purge
CCP
Crankcase Pressure
CCPS
Crankcase Pressure Sensor
CCRM
Constant Control Relay Module
CCS
Coast Clutch Solenoid
CCS
Cruise Control Switches
CCV
Closed Crankcase Ventilation
CCV
Coolant Control Valve
CDI
Common Rail Direct Injection
CDR
Crankcase Depression Regulator
CDROM
Compact Disc Read Only Memory
CEC
Computerized Emission Control System
CEL
Check Engine Light
CERT
Certification
CES
Clutch Engage Switch
CFI
Continuous Fuel Injection
CFI
Central Fuel Injection (aka Throttle Body Fuel Injection)
CFM
Cubic Feet Per Minute
CFRM
Condenser Fan Relay Module
CFS
Cubic Feet Per Second
CFV
Coolant Flow Valve
CGI
Clean Gas Induction
CID
Cubic Inch Displacement
CIS
Constant Injection System
CIS-E
Constant Injection System Electronic
CKP
Crankshaft Position
CL
Closed Loop
CLECS
Closed Loop Emission Control System
CLFCS
Closed Loop Fuel Control System
CM
Cold Mode
CMFI
Central Multi-Port Fuel Injection
CMP
Camshaft Position
CMP-L
Camshaft Position Low
CMPO
Camshaft Position Out
CMTC
Compass/Mini-Trip Computer
CMV
Coolant Mixer Valve
CNG
Compressed Natural Gas
CO
Carbon Monoxide
CO2
Carbon Dioxide
COO
Cruise On / Off Switch
COP
Coil On Plug
CP
Canister Purge
CP
Crankshaft Position
CP
Coolant Pressure
CP3
Injection Pump Produced By Bosch, Found In Various Duramax And Common Rail Cummins Engines.
CP4
Injection Pump Produced By Bosch, Found In Various Modern Common Rail Diesels.
CPP
Clutch Pedal Position
CPS
Camshaft Position Sensor
CPU
Central Processing Unit
CR
Common Rail
CR
Compression Ratio
CRFS
Common Rail Fuel System
CSF
Crankshaft Speed Fluctuation
CSFI
Central Sequential Fuel Injection
CSFI
Cold Start Fuel Igniter
CSFS
Cold Start Fuel Solenoid
CSR
Cold Start Relay
CSS
Cold Start Solenoid
CTC
Coolant Temperature Compensation
CTD
Cummins Turbo Diesel
CTM
Central Timer Module
CTOX
Continuous Trap Oxidizer
CTP
Closed Throttle Position
CVVT
Continuous Variable Valve Timing
Cyl
Cylinder
CYP
Cylinder Position
DAB
Driver Air Bag
DB
Decibel
DB2
Injection Pump Produced By Stanadyne, Found On Gm And International Idi Diesels.
DB4
Injection Pump Produced By Stanadyne, Found On 6.5L Gm Turbodiesels.
DC
Direct Current
DCA
Diesel Coolant Additive
DCC
Diagnostic Connector, Cab
DCL
Data Communications Link
DCU
Diagnostic Connector, Underhood
DCU
Doser Control Unit
DDE
Digital Diesel Electronics
DDEC
Detroit Diesel Engine Control
DDI
Direct Diesel Injection
DDI
Digital Direct Fuel Injection
DDS
Driveline Disengagement Switch
DEC
Diesel Electronic Engine Control System
DEEC
Diesel Engine Control
DEF
Diesel Exhaust Fluid
DERM
Diagnostic Energy Reserve Module
DF
Deterioration Factor
DFI
Digital Fuel Injection
DFI
Direct Fuel Injection
DI
Direct Injection
DI
Distributor Ignition
DIC
Driver Information Center
DIP
Diesel Injection Prechamber
DIS
Direct Ignition System
DIS
Distributorless Ignition System
DIT
Direct Injection Turbocharged
DLC
Data Link Connector
DME
Digital Motor Electronics
DME
Dimethyl Ether
DMIVA
Distributor Mounted Ignition Vacuum Advance
DMM
Digital Multimeter
DOC
Diesel Oxidation Catalyst
DOCIT
Diesel Oxidation Catalyst Intake Temperature
DOCOT
Diesel Oxidation Catalyst Outlet Temperature
DOHC
Dual Overhead Camshaft
DOR
Direct Ozone Reducing
DPF
Diesel Particulate Filter
DPFDP
Diesel Particulate Filter Differential Pressure
DPFE
Differential Pressure Feedback EGR
DPFIT
Diesel Particulate Filter Intake Temperature
DPFOT
Diesel Particulate Filter Outlet Temperature
DPI
Dual Plug Ignition
DPR
Diesel Particle Reduction System
DRB
Diagnostic Readout Box
DRBII
Diagnostic Readout Box Ii
DRBIII
Diagnostic Readout Box Iii
DRL
Daytime Running Lamps
DSAS
Deceleration Spark Advance System
DSI
Down Stream Injection
DS-I
Dura Spark I Ignition System
DS-II
Dura Spark Ii Ignition System
DSS
Downshift Solenoid
DST
Detonation Sensitive Timing
DT
Diesel Turbocharged
DTC
Daignostic Trouble Code
DTM
Diagnostic Test Mode
DTRM
Diesel Thermo Recirculation Module
DVOM
Digital Volt Ohm Meter
E2PROM
Electrically Erasable Programmable Read Only Memory
E85
"85%" Ethanol ("15%" Gasoline) Fuel
EAIR
Electronic Secondary Air Injection
EAT
Electronically Controlled Automatic Transaxle Or Transmission
EBC
Exhaust Brake Controller
EBCM
Electronic Brake Control Module
EBL
Electric Back Lite (Rear Window Defroster)
EBP
Exhaust Back Pressure
EBPD
Exhaust Back Pressure Desired
EBPR
Exhaust Back Pressure Regulator
EBPV
Exhaust Back Pressure Valve
EBV
Exhaust Back Pressure Valve
EC
Engine Control
ECA
Electronic Control Assembly
ECB
Engine Compression Brake
ECC
Electronic Calibration Code
ECCS
Electronic Concentrated Engine Control System
ECITS
Electronic Control Ignition Timing System
ECL
Engine Coolant Level
ECM
Electronic Control Module
ECM EIDP
Ecm External Identification Plate
ECM GND
Engine Control Module Ground
ECM IIDP
Ecm Internal Identification Plate
ECM PWR
Engine Control Module Power
ECP
Engine Certification Plate
ECP
Engine Coolant Pressure
ECS
Emission Control System
ECS
Engine Coolant System
ECSR
Engine Controlled Shutdown Request
ECT
Engine Coolant Temperature
ECT1
Engine Coolant Temperature 1
ECT2
Engine Coolant Temperature 2
ECTF
Cooling Fan Engine Coolant Temperature
ECU
Engine Control Unit
ECU
Electronic Control Unit
ECUI
Electronically Controlled Unit Injection
EDC
Electronic Diesel Control
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
Electronic Engine Control
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
EEGR
Electronic Egr Valve
EEPROM
Electronically Erasable Programmable Read Only Memory
EET
Electronic Egr Transducer
EFAN
Engine Fan
EFANS
Engine Fan Speed
EFC
Electronic Feedback Carburetor
EFC
Electronic Fuel Control
EFC
Engine Fan Control
EFE
Early Fuel Evaporization
EFI
Electronic Fuel Injection
EFP
Engine Fuel Pressure
EFRC
Engine Family Rating Code
EFS
Engine Fan Speed
EFT
Engine Fuel Temperature
EG
Ethylene Glycol
EGBP
Exhaust Gas Back Pressure
EGC
Electronic Gauge Cluster
EGDP
Exhaust Gas Differential Pressure
EGO
Exhaust Gas Oxygen Sensor
EGR
Exhaust Gas Recirculation
EGRC
Exhaust Gas Recirculation Control
EGRC
Exhaust Gas Recirculation Cooler
EGRH
Exhaust Gas Recirculation High Control
EGRL
Exhaust Gas Recirculation Low Control
EGROT
Exhaust Gas Recirculation Outlet Temperature Egrp
EGRP
Exhaust Gas Recirculation Position
EGRT
Exhaust Gas Recirculation Temperature
EGRTVV
Exhaust Gas Recirculation Thermal Vacuum Valve
EGRV
Egr Vent
EGT
Exhaust Gas Temperature (Typically Measured Before The Turbine Inlet Of The Turbocharger)
EGT1
Exhaust Gas Temperature 1
EGT2
Exhaust Gas Temperature 2
EGT3
Exhaust Gas Temperature 3
EI
Electronic Ignition
EIC
Electronic Instrument Cluster
EICU
Electronic Ignition Control Unit
EIDP
External Identification Plate
EIM
Engine Interface Module
EITC
Electronic Ignition Timing Control
ELB
Electronic Lean Burn System
ELC
Electronic Level Control
ELCD
Evaporative Loss Control Device
ELD
Electric Load Detector
ELS
Exhaust Lambda Sensor
EM
Engine Modification
EMI
Electromagnetic Interference
EMP
Exhaust Manifold Pressure
EMR
Electronic Module Retard
EMT
Exhaust Manifold Temperature
EO
Engine Overspeed
EOL
Engine Oil Level
EOP
Engine Oil Pressure
EOT
Engine Oil Temperature
EP
Exhaust Pressure, Exhaust Backpressure
EPA
Environmental Protection Agency
EPC
Electronic Pressure Control
EPR
Exhaust Back Pressure Regulator
EPROM
Erasable Programmable Read Only Memory
EPT
Egr Pressure Transducer
ESA
Electronic Spark Advance
ESC
Electronic Spark Control
ESC
Electronic System Controller
ESN
Engine Serial Number
ESS
Engine Speed Sensor
EST
Electronic Spark Timing
EST
Electronic Service Tool
ETA
Engine Timing Actuator
ETC
Electronic Temperature Control
ETC
Electronic Throttle Control
ETCS-i
Electronic Throttle Control System-Intelligent
ETP
Engine Throttle Position
ETV
Engine Throttle Valve
ETV-H
Engine Throttle Valve High
ETV-L
Engine Throttle Valve Low
ETW
Equivalent Test Weight
EVAP
Evaporative Emission Control System
EVB
Exhaust Valve Brake
EVIC
Electronic Vehicle Information Center
EVO
Electronic Variable Orifice
EVP
Egr Valve Position
EVR
Egr Vacuum Regulator
EVRT
Electronically Controlled Turbocharger
EVSV
Electronic Vacuum Switching Valve
EWL
Engine Warning Lamp
EWPS
Engine Warning Protection System
EZL
Electronic Ignition System With Variable Characteristics
F
Fahrenheit
FBC
Feedback Carburetor
FC
Fan Control
FCC
Fan Control Circuit
FCV
Fuel Coolant Valve
FDCS
Fuel Demand Command Signal
FDP
Fuel Delivery Pressure
FED
Federal
FEEPROM
Flash Electrically Erasable Programmable Read Only Memory
FEL
Family Emissions Limit
FEPROM
Flash Erasable Programmable Read Only Memory
FF
Flexible Fuel
FFM
Fuel Filter Manager; A Fuel Filter Housing Assembly (Water Separator, Fuel Heater, Etc) Manufactured By Stanadyne For Variodiv Applications. One Style In Particular Is Found On 6.5L Gm Diesels.
FHP
Friction Horsepower
FI
Fuel Injection
FICM
Fuel Injection Control Module
FIDM
Feedback Injector Drive Module
FL
Fuel Lift
FLI
Fuel Level Indicator
FMEM
Failure Mode Effects Management
FMI
Failure Mode Identifier
FP
Fuel Pump
FPC
Fuel Pump Control
FPCM
Fuel Injection Pump Control Module
FPCV
Fuel Pressure Control Valve
FPM
Feet Per Minute
FPM
Fuel Pump Monitor
FPRC
Fuel Pressure Regulator Control
FPS
Feet Per Second
FR
Fillpipe Restrictor
FRA
Fuel Rack Actuator
FRP
Fuel Rack Position
FRP
Fuel Rail Pressure
FRZF
Freeze Frame
FS
Fuel Shutoff
FSD
Fuel System Driver
FSS
Flexible Service System
FT
Feet
FT
Fuel Trim
FVCV
Fuel Volume Control Valve
GAL
Gallon
GAL/H
U.S. Gallons Per Hour
GAL/MIN
U.S. Gallons Per Minute
GCW
Gross Combined Weight
GCWR
Gross Combined Weight Rating
GFD
Generic Field Data
GFP
Gaseous Fuel Prep
GMF
Gas Mass Flow
GND
Ground
GOVERNOR
Governor
GP
Glow Plug
GPC
Glow Plug Control
GPCM
Glow Plug Control Module
GPD
Glow Plug Diagnostic
GPL
Glow Plug Wait Lamp
GPM
Gallons Per Minute
GPM
Grams Per Million
GPM
Glow Plug Module
GPR
Glow Plug Relay
GTWR
Gross Trailer Weight Rating
GVW
Gross Vehicle Weight
GVWR
Gross Vehicle Weight Rating
H2O
Water
HC
Hydrocarbons
HCI
Hydrocarbon Injection
HCT
Hydrocarbon Trap
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
HEGR
High Efficiency Exhaust Gas Recirculation
HEI
High Energy Ignition
HEST
High Exhaust System Temperature
HEUI
Hydraulic Electronic Unit Injector
HFAN
High Speed Cooling Fan
HFC
High Fan Control
HFCM
Horizontal Fuel Conditioning Module Hg
HFM
Hot Film Air Mass Sensor
HI
High Idle
HIG
High Idle Governor
HO
High Output
HO2S
Heated Oxygen Sensor
hp
Horsepower
HPCAC
High-Pressure Charge Air Cooler
HPCR
High Pressure Common Rail
HPOP
High Pressure Oil Pump
HSC
High Swirl Combustion
HSIA
High Speed Inlet Air Control
HVAC
Heater Vent Air Conditioning
HVS
High Voltage Switch Ignition System
I/M
Inspection And Maintenance
IA
Intake Air
IAC
Idle Air Control
IACV-AAC
Idle Air Control Valve-Auxiliary Air Control Valve
IAH
Intake Air Heater
IAHD
Intake Air Heater Diagnostic
IAHR
Intake Air Heater Relay
IAP
Injection Actuation Pressure
IAT
Intake Air Temperature
IC
Ignition Control
IC
Integrated Circuit
IC
Intercooler (Synonymous With Charge Air Cooler Or Aftercooler)
ICG1
Injector Control Group 1
ICG2
Injector Control Group 2
ICM
Ignition Control Module
ICP
Injector Control Pressure
ICPR
Injection Control Pressure Regulator
ICS
Ignition Control System
ICTO
Ignition Coolant Temperature Override
ID
Inside Diameter
IDI
Indirect Diesel Injection
IDLE
Idle
IDM
Ignition Diagnostic Monitor
IDM
Injector Drive Module
IDS
Integrated Diagnostic System
IFI
Indirect Fuel Injection
IFP
Injection Fuel Pressure
IGN
Ignition
II
Idle Increment
IIDD
Internal Identification Data
IIDP
Internal Identification Plate
ILEV
Inherently Low Emissions Vehicle
ILO
Injector Leak Off
IMAT
Intake Manifold Air Temperature
IMP
Intake Manifold Pressure
IMRC
Intake Manifold Runner Control
IMRP
Injector Metering Rail Pressure
IMT
Intake Manifold Temperature
IN
Inch
inH2O
Inch Of Water
inHg
Inch Of Mercury
INJ
Injector
IOD
Ignition Current Off Draw
IP
Injection Pump Or Injector Pump
IPR
Injection Pressure Regulator
ISB
Interact System B (B Series), Name Of The 5.9L, 24 Valve Cummins.
ISC
Idle Speed Control
ISC
Interstate Cooler
ISIS
International® Service Information Solutions
ISO9141
International Standards Organization Obdii Communication Mode
IST
Idle Shutdown Timer
ITP
Internal Transfer Pump
ITRP
Injector Timing Rail Pressure
ITS
Idle Tracking Switch
ITV
Intake Throttle Valve
ITV-H
Intake Throttle Valve High Control
ITV-L
Intake Throttle Valve Low Control
ITVP
Intake Throttle Valve Position
IV
Idle Validation
IVS
Idle Validation Switch
J1850PWM
(Pulse Width Modulated) Sae Established Obd Ii Communication Standard Used By Ford Domestic Cars And Light Trucks. One Of Thrdiv Hardware Layers Defined By Obd Ii
J1850VPW
(Variable Pulse Width Modulated) Sae Established Obd Ii Communication Standard Used By Gm Cars And Light Trucks. One Of Thrdiv Hardware Layers Defined By Obd Ii
J1939-H
J1939 Data Link High
J1939-L
J1939 Data Link Low
J1962
Sae Established Standard For The Connector Plug Layout Used For All Obd Ii Scan Tools
J1978
Sae Established Standard For Obd Ii Scan Tools
J1979
Sae Established Standard For Diagnostic Test Modes
J2012
Sae Established Standard Accepted By Epa As The Standard Test Report Language For Emission Tests
JCT
Junction (Electrical)
JTEC
Jeep Truck Powertrain Control Module System
KAM
Keep Alive Memory
KG
Kilogram
KM
Kilometer
KM/H
Kilometers Per Hour
KM/L
Kilometers Per Liter
KOEO
Key On Engine Off
KOER
Key On Engine Running
KS
Knock Sensor
LB/FT
Pounds Of Force Per Foot
LB/IN
Pounds Of Force Per Inch
LB/S
Pounds Per Second
LBM
Pounds Of Mass
LCD
Liquid Crystal Display
LDP
Leak Detection Pump
LDT
Light-Duty Truck
LDT1
Ldt < 6000#Gvwr, 0-3750#Lvw
LDT2
Ldt < 6000#Gvwr, 3751-5750#Lvw
LDT3
Ldt 6001-8500#Gvwr, 3751-5750#Alvw
LDT4
Ldt 6001-8500#Gvwr, 5751-8500#Alvw
LED
Light Emitting Diode
LEV
Low Emissions Vehicle
LFAN
Low Speed Cooling Fan
LH
Lefthand
LNC
Lean Nox Catalyst
LNG
Liquefied Natural Gas
LOAD
Calculated Load Value
LP
Lift Pump, Referring To The Low Pressure Fuel Pump On A Diesel Engine.
LPCAC
Low-Pressure Charge Air Cooler
LPG
Liquid Propane Gas
LPT
Light Pressure Turbo
LSD
Low Sulfur Diesel
LUS
Lock-Up Solenoid
LVW
Loaded Vehicle Weight
M
Meter
M/CCC
Modulated Converter Clutch Control
M/S
Meters Per Second
M/T
Manual Transaxle Or Transmission
MAF
Mass Air Flow
MAG
Magnetic
MAP
Manifold Absolute Pressure
MAT
Multiair Technology
MC
Mixture Control
MCC
Manifold Catalytic Converter
MCCA
Message Center Control Assembly
MCS
Mixture Control System
MCU
Microprocessor Control Unit
MC-VAF
Measuring Core Volume Air Flow
MDFI
Mechanical Diesel Fuel Injection
MDP
Manifold Differential Pressure
MDV
Medium-Duty Vehicle
MDV4
Mdv 8501 -10000#Gvwr
MDV5
Mdv 10001-14000#Gvwr
MEMCAL
Memory Calibration Unit
MEP
Mean Effective Pressure
MFG
Manufacturer
MFI
Multiport Fuel Injection
MGF
Mass Gas Flow
MGP
Manifold Gauge Pressure
MI
Mile
MIC
Mechanical Instrument Cluster
MID
Message Identifier
MIL
Malfunction Indicator Light (The "Check Engine Light" On Your Dash)
MIP
Mixer Inlet Pressure
MLP
Manual Lever Position
MLUS
Modulator Lock-Up Solenoid
MM
Millimeter
MPG
Miles Per Gallon
MPH
Miles Per Hour
MPI
Multi-Port Injection
MPR
Main Power Relay
MSDS
Material Safety Data Sheet
MSG
Micro Strain Gauge
MSM
Multiplex System Module
MST
Manifold Surface Temperature
MTA
Managed Thermactor Air
MUI
Mechanical Unit Injection
MUTII
Multi-Use Tool, Second Edition
MVZ
Manifold Vacuum Zone
MY
Model Year
N·m
Newton Meter
NAC
Nitrogen Oxides (Nox) Absorbing Catalyst
NC
Normally Closed (Electrical)
NETS
Navistar Electronics Technical Support
NGS
New Generation Star Tester
NGV
Natural Gas Vehicle
NH30C
Ammonia Oxidation Catalyst
NH3S
Ammonia Sensor
N-m
Newton Meters, A Metric Measurement Of Torque (Convertible To Ft-Lbs/Lb-Ft)
NO
Normally Open (Electrical)
NOS
Nox Sensor
NOx
Nitrogen Oxides
NOXS
NOx Sensor
NP
New Process Gear, Popular Manufacturer Of Transmission And Transfer Cases For Various Automakers. Purchased By Chrysler And Latdiv Merged With Gm'S Muncie Division.
NSC
Nox Storage Catalyst
NV
New Venture Gear, A Joint Venture Between Gm And Chrysler Resulting In The Production Of Various Transmissions And Transfer Casediv Company Was Essentially A Merger Of Gm'S Muncie And Chrysler'S New Process Gear Divisions.
NVRAM
Non Volatile Random Access Memory
O2
Oxygen
O2S
Oxygen Sensor
O2SH
Oxygen Sensor Heater
OAT
Organic Acid Technology
OBD
On Board Diagnostic
OBDII
On Board Diagnostics II (New Style Adapter Plug In 1996 & Newer Vehicles)
OBS
Old Body Style
OC
Oxidation Catalytic Converter
OCC
Output Circuit Check
OCP
Overcrank Protection
OD
Outside Diameter
ODM
Output Driver Module
ODO
Odometer
OEM
Original Equipment Manufacturer
OHC
Overhead Cam
OL
Open Loop
OL
Over Limit
OPS
Oil Pressure Sensor
OPS
Oil Pressure Switch
ORH
Out-Of-Range High
ORL
Out-Of-Range Low
ORVR
On Board Refueling Vapor Recovery
OSAC
Orifice Spark Advance Control
OSC
Output State Control
OSS
Output Speed Sensor
OSS
Output Shaft Speed
OTIS
Overhead Travel Information System
OWL
Oil/Water Warning Lamp
P/N
Part Number
PAB
Passenger Air Bag
PAD
Passenger Air Bag Disable
PAG
Polyalkaline Glycol
PAIR
Pulsed Secondary Air Injection
PC
Passenger Car
PC
Pressure Control
PCI
Programmable Communication Interface
PCM
Powertrain Control Module
PCV
Positive Crankcase Ventilation
PDB
Positive Displacement Blower
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 Identification Descriptions
PIP
Profile Ignition Pickup
PL
Protect Lamp
PM
Personality Module
PMD
Pump Mounted Driver
PMS
Particulate Matter Sensor
PNP
Park/Neutral Position
ppm
Parts Per Million
PRC
Pressure Regulator Control
PROM
Programmable Read Only Memory
PSI
Pounds Per Square Inch
PSIA
Pounds Per Square Inch Absolute
PSIG
Pounds Per Square Inch Gauge
PSP
Power Steering Pressure
PSPS
Power Steering Pressure Switch
pt
Pint
PTC
Pending Trouble Code
PTEC
Powertrain Electronic Controller Management System
PTO
Power Take Off
PTOT
Pto Oil Temperature
PTOX
Periodic Trap Oxidizer
PW
Pulse Width
PWM
Pulse Width Modulation
PWR
Power (Voltage)
QT
Quart
R
Key On Engine Running
RABS
Rear Anti-Lock Braking System
RAM
Random Access Memory
RAP
Retained Accessory Power
RAPP
Remote Accelerator Pedal Position
RAS
Resume / Accelerate Switch (Speed Control) Repto
RDQS
Reductant Quality Sensor
RDS
Radio Data System
REDOX
Reduction Oxidation Catalytic Converter
REGT
Recirculated Exhaust Gas Temperature
REPTO
Rear Engine Power Takeoff
REV
Revolution
RFI
Radio Frequency Interference
RFP
Rail Fuel Pressure
RGT
Rear Gear Train
RH
Righthand
RKE
Remote Keyless Entry
ROM
Read Only Memory
RON
Research Octane Number
RPM
Revolutions Per Minute
RPRE
Remote Preset
RPS
Revolutions Per Second
RSE
Radiator Shutter Enable
RSL
Red Stop Lamp
RVAR
Remote Variable
S/N or SN
Serial Number
SAE
Society Of Automotive Engineers
SAE J1587 DL
Sae J1587 Data Link
SAE J1587 DL–
Sae J1587 Data Link Negative
SAE J1587 DL+
Sae J1587 Data Link Positive
SAE J1922 DL
Sae J1922 Data Link
SAE J1939 DL
Sae J1939 Data Link
SAE J1939 DL–
Sae J1939 Data Link Negative
SAE J1939 DL+
Sae J1939 Data Link Positive
SAE J1939 DL-H
Sae J1939 Data Link High
SAE J1939 DL-L
Sae J1939 Data Link Low
SAE J1939 SHLD
Sae J1939 Data Link Shield
SAW
Spark Angle Word
SBEC
Single Board Engine Control
SC
Supercharger
SCA
Supplemental Coolant Additive
SCB
Supercharger Bypass
SCC
Spark Control Computer
SCCS
Speed Control Command Switches
SCPI
Sequential Central Port Fuel Injection
SCR
Selective Catalytic Reduction
SCRC
Selective Catalytic Reduction-Urea/Ammonia
SCRC-NH3
Selective Catalytic Reduction-Urea/Ammonia
SCR-N
Selective Catalytic Reduction-Urea/Ammonia
SCR-U
Selective Catalytic Reduction-Urea/Ammonia
SCS
Speed Controlled Spark
SCS
Speed Control Switch
SES
Service Engine Soon Dash Light
SFI
Sequential Fuel Injection
SFP
Supply Fuel Pressure
SFT
Supply Fuel Temperature
SFTP
Supplementary Federal Test Procedure
SHD
Shield (Electrical)
SHO
Super High Output
SID
Subsystem Identification Descriptions
SIG CNDB
Signal Ground Body
SIG GND
Signal Ground
SIG GNDC
Signal Ground Chassis
SIG GNDE
Signal Ground Engine
SIL
Shift Indicator Lamp
SKIM
Smart Key Immobilizer Module
SMEC
Single Module Engine Control
SO2
Sulfur Dioxide
SOHC
Single Overhead Camshaft
SPCS
Spark Plug Switching Control System
SPEEDO
Speedometer
SPI
Serial Peripheral Interface
SPK
Spark Control
SPL
Smoke Puff Limiter
SPN
Suspect Parameter Number
SPOUT
Spark Output
SRI
Service Reminder Indicator
SRS
Supplemental Restraint System
SRT
System Readiness Test
SS
Shift Solenoid
SSI
Solid State Ignition
SST
Special Service Tool
ST
Scan Tool
STAR
Self-Test Automatic Readout
STC
Spark Timing Control
STD
Standard
STI
Self-Test Input
STO
Self-Test Output
SULEV
Super Ultra Low Emissions Vehicle
SVO
Special Vehicle Operations
SVT
Special Vehicle Team
SW
Switch (Electrical)
SWBAT
Switch Battery
SYNC
Synchronization
TA
Timing Actuator
TAB
Thermactor Air Bypass Vacuum Solenoid Valve
TAC
Tachometer Output Signal
TAC
Throttle Actuator Control
TACH
Tachometer Output Signal
TAD
Thermactor Air Diverter Vacuum Solenoid Valve
TB
Throttle Body
TBD
To Be Determined
TBI
Throttle Body Injection
TC
Turbocharger
TC2CIS
Turbocharger 2 Compressor Intake Sensor
TCC
Torque Converter Clutch
TCCP
Torque Converter Clutch Pressure
TCM
Transmission Control Module
TCS
Transmission Controlled Spark
TCWC
Turbocharger Wastegate Control
TDC
Top Dead Center
TDE
Transmission Driving Engaged
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
TOP
Transmission Oil Pressure
TOSS
Transmission Output Shaft Speed
TOT
Transmission Oil Temperature
TP
Throttle Position
TPI
Tuned Port Injection
TPOUT
Throttle Position Output
TPS
Throttle Position Sensor
TR
Transmission Range
TRS
Transmission Regulated Spark
TSB
Technical Service Bulletin
TSS
Transmission Speed Sensor
TSS
Turbine Speed Sensor
TSS
Turbine Shaft Speed
TTS
Transaxle Temperature Switch
TTS
Transmission Tailshaft Speed
TV
Throttle Valve
TVP
Throttle Valve Potentiometer
TVS
Thermal Vacuum Switch
TVV
Thermal Vacuum Valve
TWC
Three Way Catalytic Converter
TWC+OC
Three Way + Oxidation Catalytic Converter
UCC
Underbody Catalytic Converter
UIC
Universal Integrated Circuit Ignition
UL
Useful Life
ULEV
Ultra Low Emissions Vehicle
ULSD
Ultra Low Sulfur Diesel
UVC
Under Valve Cover
V
Volt
VAC
Vacuum
VAF
Vane Air Flow
VAF
Volume Air Flow
VANOS
Double Variable Camshaft Control
VAT
Vane Air Temperature
VBAT
Battery Voltage
VC
Volume Control
VCM
Vehicle Control Module
VCRM
Variable Control Relay Module
VDC
Volts Of Direct Current
VDV
Vacuum Delay Valve
VEPS
Vehicle Electronic Programming System
VFD
Vacuum Fluorescent Display
VGT
Variable Geometry Turbocharger
VIC
Vehicle Information Center
VICS
Variable Inertia Charging System
VIGN
Ignition Voltage
VIN
Vehicle Identification Number
VIT
Vehicle Interface Tool
VLS
Vehicle Limiting Speed
VLSG
Vehicle Limiting Speed Governor
VNT
Variable Nozzle Turbocharger
VOP
Valve Opening Pressure
VP-20
Bosch Vp-20 Diesel Engine Control System
VPM
Vehicle Personality Module
VR
Voltage Regulator
VRE
Vehicle Retarder Enable
VREF
Voltage Reference
VREF1
Reference Voltage Engine
VREF2
Reference Voltage Chassis
VREF3
Reference Voltage Chassis
VREF4
Reference Voltage Aftertreatment
VRV
Vacuum Regulator Valve
VS
Variable Speed
VSG
Variable Speed Governor
VSO
Vehicle Speed Output
VSS
Vehicle Speed Sensor
VSS_CAL
Vehicle Speed Output
VSS-H
Vehicle Speed Sensor High
VSS-L
Vehicle Speed Sensor Low
VTEC
Variable Valve Timing & Valve Lift Electronic Control
VTSS
Vehicle Theft Security System
VVT
Variable Valve Timing
VVTi
Variable Valve Timing With Intelligence
VVTL-i
Variable Valve Timing & Lift Intelligence
WAC
Wide Open Throttle A/C Cutoff
WCC
Warm-Up Catalytic Converter
WCC
Wastegate Control Circuit
WEL
Warn Engine Lamp
WIF
Water In Fuel
WIFL
Water In Fuel Lamp
WOT
Wide Open Throttle
WOTPS
Wide Open Throttle Position Switch
WR-H02S
Wide Range/Linear/Heated Air-Fuel Ratio Sensor
WSL
Wait To Start Lamp
WSS
Wheel Speed Sensor
WTEC
World Transmission Electronically Controlled Automatic Transmissions (Allison)
WTSL
Wait To Start Lamp
WU
Warm-Up Catalyst
WU-OC
Warm Up Oxidation Catalytic Converter
WU-TWC
Warm Up Three Way Catalytic Converter
X
Equipped
XCS
Transfercase
XMSN
Transmission
ZEV
Zero Emissions Vehicle
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