While reading service information or an Electronic Service Manual (ESM), have you ever stumbled over an abbreviation or acronym and lost track of what was being said? Do not feel alone since it happens to all of us periodically. Wiring diagram abbreviations, sometimes called wiring diagram codes or cell codes in the older printed Service Manuals, can be especially confusing. Whichever system you are looking at in the ESM, you will find abbreviations or acronyms rather than a set of words repeated again and again. In this article, we have provided you with a list of some abbreviations and acronyms and what they mean. Some you may have heard before and already know, but some may be new to you.
AAA
American Automobile Association
AABS
Advanced Air Bag System
AABT
Advanced Air Bag Technology
AAC
Auxiliary Air Cut Valve (see IAC)
AAQ
Ambient Air Quality
ABLS
Active Brake Limited Slip
ABS
Anti-lock Braking System
A/C
Air Conditioner
ACC
Accelerator Control System
ACCS
Advanced Climate Control System
ACL
Air Cleaner
ACRLY
Air Conditioning Relay
ADAS
Advanced Driver Assistance Systems
ADJ
Adjust
ADP
Automatic Drive Positioner
AEB
Active Engine Brake
A/F
Air / Fuel Ratio
A/F Sensor
Air Fuel Ratio Sensor
AFM
Air Flow Meter (see MAF)
AFR
Sensor Air Fuel Ratio Sensor
ALC
Active Lane Control
ALR
Automatic Locking Retractor
ANC
Active Noise Cancellation
AP
Accelerator Pedal
APA
Accelerator Pedal Actuator
APCD
Air Pollution Control District
APLS
Automated Parts Locator System
APP
Accelerator Pedal Position
ARB
Air Resources Board
ARCON
Air Conditioning Switch
AS
Assistant Side (front passenger side)
ASCD
Automatic Speed Control Device
ASCDSW
Automatic Speed Control Device Switch
ASE
Automotive Service Excellence
ASE
Active Sound Enhancement
ASIST
Automotive Service Information Support Terminal
ASR
Automatic Stock Replenishment (system to manage Infiniti dealership’s parts stock)
ASSY
Assembly
A/T
Automatic Transaxle/Transmission
ATCH
Automatic Transmission Check
ATDC
After Top Dead Center
ATF
Automatic Transmission Fluid
ATTESA
Advanced Total Traction Engineering System for All
ATTESA ETS
Advanced Total Traction Engineering System for All with Electronic Torque Split
AUC
Active Understeer Control
AV
Audio Visual
AVM
Around View Monitor
AWD
All-Wheel Drive
BARO
Barometric Pressure
BATT
Battery
BBG
Body Builder’s Guide (for aftermarket up-fitters)
BCI
Back-up Collision Intervention
BCM
Body Control Module
BCS
Body Control System
BCU
Brake Booster Control Unit
BFT
Fusible (link) Terminal
BLSD
Brake Limited Slip Differential
BMS
Battery Management System
BNCSW
Brake Normal Close Switch
BO
Back Order
BPP
Brake Pedal Position
BR
Brake System
BRAKE
Brake Switch
BRC
Brake Control System
BRM
Body Repair Manual
BSI
Blind Spot Intervention
BSTSW
Boost Switch
BSW
Blind Spot Warning
CA
Consumer Affairs
CAFE
Corporate Average Fuel Economy
CAN
Controller Area Network
CAN-H
Controller Area Network - High
CAN-L
Controller Area Network - Low
CARB
California Air Resource Board
CC
Crew Cab
CCS
Cruise Control System
CDCV
Canister Drain Control Valve
CGI
Compacted Graphite Iron
CHMSL
Center High Mounted Stop Lamp
CKP
Crankshaft Position
CKPS
Crankshaft Position Sensor
CL
Clutch
CL
Closed Loop
CMOS
Complementary Metal Oxide Semiconductor
CMP
Camshaft Position
CMPS
Camshaft Position Sensor
CMVSS
Canadian Motor Vehicle Safety Standards
CO
Carbon Monoxide
CO2
Carbon Dioxide
CONSULT
Computerized On-board System Universal Tester
CONV
Conventional
CONV
Convertible
CPC
Canister Purge Control
CPP
Clutch Pedal Position
CRTN
Current Return
CSC
Concentric Slave Cylinder
CTP
Closed Throttle Position
CRNT
Current
CVBV
Cut Valve Bypass Valve
CVT
Continuously Variable Transmission
CZS
Crash Zone Sensor
D1
Drive Range 1st Gear
D2
Drive Range 2nd Gear
D3
Drive Range 3rd Gear
D4
Drive Range 4th Gear
DAA
Driver Attention Alert
DAB
Dealer Advisory Board
DAS
Driver Assistance System
DASS
Direct Adaptive Steering System
DCA
Distance Control Assist
DDS
Downhill Drive Support
DEF
Defogger
DEFRLY
Defogger Relay
DFI
Direct Fuel Injection
DIFF
Differential
DLC
Data Link Connector
DLK
Door and Lock
DLN
Driveline
DMM
Digital Multimeter
DMS
Drive Mode System
DOHC
Dual Overhead Cam (1991-1998 models)
DR
Driver Side
DTC
Diagnostic Trouble Code
DTRL
Daytime Running Lights
EBD
Electric Brake Force Distribution
EC
Engine Control
EC
Engine Control System
ECL
Engine Coolant Level
ECM
Electronic Control Module
ECT
Engine Coolant Temperature
ECU
Electronic Control Unit
ECV
Electrical Control Valve
ECZS
Electronic Crash Zone Sensor
EDR
Event Data Recorder
EEPROM
Electrically Erasable Programmable Read Only Memory
EFT
Engine Fuel Temperature
EGR
Exhaust Gas Recirculation
EGRT
Exhaust Gas Recirculation Temperature
EGRTS
Exhaust Gas Recirculation TemperatureSensor
EGT
Exhaust Gas Temperature
EHC
Engine Harmonic Cancellation
ELR
Emergency Locking Retractor
EM
Engine Mechanical
EMNT
Engine Management
EOP
Engine Oil Pressure
EP
Exhaust Pressure
EPR
Exhaust Pressure Regulator
EPS
Electronically Controlled Power Steering
EQRG
Electronic Quick Reference Guide
ESC
Extended Service Contracts
ESCL
Electronic Steering Column Lock
ESM
Electronic Service Manual
ESP
Electronic Stability Program System
E/T
Exhaust Temperature
EV
Electric Vehicle
EVAP
Evaporative Emissions
EVAP
Canister Evaporative Emission Canister
EVB
EV Battery System
EVC
EV Control System
EVSE
Electric Vehicle Supply Equipment
EVT
Exhaust Valve Timing
EX
Exhaust System
EXC
Exhaust Control
EXL
Exterior Lighting System
EXT
Exterior
F1
Fixed Right 1st Time
FAX
Front Axle
FC
Fan Control
FCV
Fuel Cell Vehicles
FCW
Forward Collision Warning
FEB
Forward Emergency Braking
FEBS
Forward Emergency Braking System
FFV
Flex Fuel Vehicle
FIC
Fuel Injector Control
FL
Fuel System
FMVSS
Federal Motor Vehicle Safety Standards
FP
Fuel Pump
FPR
Fuel Pump Relay
FQA
Field Quality Assurance
FQI
Field Quality Investigation
FR
Front
FRP
Fuel Rail Pressure
FRT
Fuel Rail Temperature
FSU
Front Suspension
FTP
Fuel Tank Pressure
FTT
Fuel Tank Temperature
GHG
Green House Gases
GI
General Information
G/ms
Grams Per Millisecond
GND
Ground
GND-A
Ground – Analog Sensor Ground
GND-C
Ground – Control Module Ground
GPS
Global Positioning System
GST
Generic Scan Tool
GW
Glass and Window System
HA
Heater and Air Conditioning System
HAC
Heater and Air Conditioning Control System
HBB
Hybrid Battery System
HBC
Hybrid Control System
HBMC
Hydraulic Body-Motion Control System
HC
Hydrocarbon
HCO
High Voltage Cooling System
HDC
Hill Descent Control
HDD
Hard Disk Drive
H-EPS
Hydraulic Electric Power Steering
HEV
Hybrid Electric Vehicle
HFP
Hands-free Phone
H/LMP
Headlamp
HO2S
Heated Oxygen Sensor
HO2S1
Heated Oxygen Sensor 1
HO2S2
Heated Oxygen Sensor 2
HPCM
Hybrid Powertrain Control Module
HR
High Roof
HRN
Horn
HSA
Hill Start Assist
I/M
Inspection and Maintenance
IA
Intake Air
IAC
Idle Air Control
IAT
Intake Air Temperature
IAVL
Idle Air Volume Learn
IBA
Intelligent Brake Assist
IC
Ignition Control
ICC
Intelligent Cruise Control
ICE
Internal Combustion Engine
ICM
Ignition Control Module
IDLE
Idle
IDL A/V
Idle Air Volume Learning
IGN
Ignition
IGNSW
Ignition Switch
IMLINE
Immobilizer Communication Line
INJ
Injector
INL
Interior Lighting System
INT
Interior
IP
Instrument Panel
IPDM E/R
Intelligent Power Distribution Module Engine Room
IRS
Independent Rear Suspension
ISC
Idle Speed Control
ISS
Input Shaft Speed
ITS
Intelligent Technology Suite
IVT
Intake Valve Timing
KC
King Cab
KNX
Knock
KS
Knock Sensor
LAN
Local Area Network
LATCH
Lower Anchors and Tethers for Children
LBC
Li-ion Battery Controller
LCD
Liquid Crystal Display
LCU
Local Control Unit
LCV
Light Commercial Vehicle
LDP
Lane Departure Prevention
LDW
Lane Departure Warning
LED
Light Emitting Diode
LED-R
Light Emitting Diode-Red
LEV
Low Emission Vehicle
LH
Left Hand
Li-ion
Lithium Ion Battery
LIN
Local Interconnect Network
LLC
Long Life Coolant
LOAD
Load
LSD
Limited Slip Differential
LU
Engine Lubrication System
MA
Maintenance
MAIN SW
Main Switch
MAS
Mass Air Flow Sensor
MAF
Mass Air Flow
MAP
Manifold Absolute Pressure
MES
Mobile Entertainment System
MDU
Multi Display Unit
MIL
Malfunction Indicator Lamp
MIR
Mirrors
MOBI
Mobile Applications
MOD
Moving Obstacle Detection
M/T
Manual Transaxle/Transmission
MWI
Meter, Warning Lamp and Indicator
NADA
National Auto Dealer Association
NATS
Nissan Anti-theft System
NEUT
Neutral
NISMO
Nissan Motorsports International
NPLS/ILS
Nissan Personal Learning System/ Infiniti Learning System
NOX
Nitrogen Oxides
NTC
Negative Temperature Coefficient
O2
Oxygen
O2S
Oxygen Sensor
OAT
Outside Air Temperature
OBD
On Board Diagnostics
OCS
Occupant Classification System
OD
Overdrive
ODS
Occupant Detection System
OEM
Original Equipment Manufacturer (stock replacement parts)
OL
Open Loop
OM
Owner’s Manual
OSS
Output Shaft Speed
ORVR
On Board Refueling Vapor Recovery
P&S
Parts & Service
PB
Parking Brake System
PBR
Potentio Balance Resistor
PCV
Positive Crankcase Ventilation
PCS
Power Control System
PDI
Pre-Delivery Inspection
PDM
Power Delivery Module
PFCW
Predictive Forward Collision Warning
PG
Power Supply, Ground and Circuit Element
PHASE
Phase
PIAP
Port Installed Accessory Programs
PKB
Parking Brake
PN
Part Number
P/N
Part Number
PNP
Park/Neutral Position
POS
Position
PQRG
Printed Quick Reference Guide
PRES
Pressure
PS
Power Steering
P/S
Power Steering
PSP
Power Steering Pressure
PT
Powertrain
PTC
Positive Temperature Coefficient
PTO
Power Takeoff
PWC
Power Window Control System
PWM
Pulse Width Modulation
PWO
Power Outlet
PWST
Power Steering
PZEV
Partial Zero Emission Vehicle
QA
Quality Air
QRG
Quick Reference Guide
RAM
Random Access Memory
RAS
Rear Active Steer
RAX
Rear Axle
RC
Regular Cab
RCTA
Rear Cross Traffic Alert
RDEF
Rear Defogger
REF
Reference
RH
Right Hand
RHD
Right Hand Drive
RF
Roof
RFRH
Radiator Fan Relay High
RFRL
Radiator Fan Relay Low
RGB
Red, Green, and Blue light
ROM
Read Only Memory
RPM
Revolutions per Minute
RR
Rear
RSU
Rear Suspension
SAB
Side Air Bag
SAE
Society of Automotive Engineers, Inc.
SAI
Steering Axis Inclination
SB
Seat Belt
SBC
Seat Belt Control System
SCV
Swirl Control Valve
SDS
Service Data and Specifications
SE
Seat
SEC
Security Control System
SEN
Sensor
SENSGND
Sensor Ground
SMG
Service and Maintenance Guide
SMJ
Super Multiple Junction
S-MODE
SynchroRev Match Mode
SOC
State Of Charge
SOHC
Single Overhead Cam (1989, 1990 models)
SOL
Solenoid
SPR
Spring
SR
Standard Roof
SRC
SRS Air Bag Control System
SRS
Supplemental Restraint System
SRT
System Readiness Test
SSOFF
Self Shut-Off
SST
Special Service Tools
ST
Steering System
STC
Steering Control System
STRG
Steering
STSW
Start Switch
SULEV
Super-Ultra Low Emission Vehicle
TA
Temperature Ambient
TACHO
Tachometer Signal Output
TAMB
Temperature Ambient
TC
Turbocharger
TCM
Transmission Control Module
TCS
Traction Control System
TCU
Telematics Communication Unit
TF
Temperature Fuel
TFUEL
Temperature Fuel
THRTL
Throttle
TM
Transaxle and Transmission
T/M
Transmission
TMS
Traction Motor System
TP
Throttle Position
TPMS
Tire Pressure Monitoring System
TPS
Throttle Position Sensor
TSB
Technical Service Bulletin
TSC
Trailer Sway Control
TSS
Turbine Shaft Speed
TVO
Throttle Valve Opening
TW
Temperature Water
TWC
Three Way Catalytic Converter
UGDO
Universal Garage Door Opener
ULEV
Ultra Low Emission Vehicle
USS
Uphill Start Support
VB
Voltage Battery
VC
Vehicle Charging System
VCM
Vehicle Control Module
VDC
Vehicle Dynamics Control System
VDCT
Variable Duct Solenoid
VHCL
Vehicle
VIAS
Variable Induction Air System
VID
Vehicle Information Display
VIN
Vehicle Identification Number
VLSD
Viscous Limited-slip Differential
VSP
Approaching Vehicle Sound for Pedestrian
VSP
Vehicle Speed
VSS
Vehicle Speed Sensor
VTC
Valve Timing Control
VTCPUS
VTC Pick Up Sensor
VTCPUSEL
VTC Pick Up Sensor Exhaust Left
VTCPUSER
VTC Pick Up Sensor Exhaust Right
VTL
Ventilation System
WAG
Wagon
WCS
Warning Chime System
WOT
Wide Open Throttle
WSS
Wheel Speed Sensor
WT
Road Wheels and Tires
WW
Wiper and Washer
ZEV
Zero Emissions Vehicle
1 1
1st Range 1st Gear
1 2
1st Range 2nd Gear
1GR
1st Gear
2 1
2nd Range 1st Gear
2 2
2nd Range 2nd Gear
2GR
2nd Gear
2WD
2-Wheel Drive
3GR
3rd Gear
4GR
4th Gear
4WAS
4-Wheel Active Steer
4WD
4-Wheel Drive
5GR
5th Gear
6GR
6th Gear
7GR
7th Gear
???
Indicates Unknown
