Industry Terms & Acronyms
Browse Noregon’s glossary of terms, definitions, and acronyms from the commercial vehicle maintenance industry.
A
AA
Additional Axle
ABS
Anti-lock Brake System
AC
1) Air Conditioning
2) Audio Control
ACB
Active Cruise with Braking
ACC
Active Cruise Control
ACCS
Air Conditioning Cycle Switch
Accurate Trim Test
Tests the Vehicle Dynamics Module and displays a nearly instantaneous response from the ECU
ACERT
Advanced Combustion Emissions Reduction Technology
ACM
1) Aftertreatment Control Module
2) In Ford terminology, Audio Control Module
ACP
Air Conditioning Pressure Switch
Actuator Test
The Actuator test will command the selected actuator to the desired state for 5 seconds, allowing for the inspection of actuator movement and detection of failures. Failures can be detected by visual inspection or by measuring voltage changes with a Digital Multimeter.
ADS
Airless Doser System
AFI
Aftertreatment Fuel Injector
AFT
Aftertreatment
AFT Fuel Doser
CTL International terminology. Also known as Aftertreatment 1 Fuel Pressure 1 Control.
AFT Fuel Shutoff
CTL International terminology. Also known as Aftertreatment 1 Ignition.
Aftertreatment Maintenance Reset
The aftertreatment maintenance reset can be performed to enable DPF regeneration when it is inhibited due to certain aftertreatment related faults. It should not be performed until the underlying issue is repaired. Repairs may include replacement of Diesel Oxidation Catalyst, replacement of the Diesel Particulate Filter, or replacement of the hydrocarbon injector unit.
Aftertreatment Reset
The Aftertreatment reset (DPF Ash Reset) request provides the ability to reset the soot level after an aftertreatment component has been cleaned or replaced. International terminology for DPF Ash Accumulator Reset.
AHI
Aftertreatment Hydrocarbon Injector
Air Management Test
This test will validate operation and performance of the Air Management System by monitoring effects on Intake Manifold Pressure (IMP).
AL
Additional Axle Left
AMPLI
Volvo’s API for communicating to Volvo/Mack vehicles to read faults and run bi-directional tests
APIM
Accessory Protocol Interface Module
APP
Accelerator Pedal Position
APP1
Accelerator Pedal Track 1
APP2
Accelerator Pedal Track 2
APP3
Accelerator Pedal Track 3
AR
Additional Axle Right
ASIST
Web-based management tool developed by Decisiv
ATA
American Trucking Association
ATC
Automatic Traction Control
ATCM
All Terrain Control Module
Auxiliary
Any ECU found on a vehicle that is not a powertrain component (i.e. Instrument Cluster, Brakes, Body Control Module, etc.)
AV3G
Bendix® AutoVue® 3G
B
B+
Battery Voltage
BARO
Barometric Pressure
BCM
Body Control Module
BOO
Brake Pedal ON/OFF
Boost Pressure
Boost pressure indicates the manifold air pressure or turbocharger or supercharger boost pressure to an internal combustion engine
BPA
Brake Pressure Applied
C
CAN
Controller Area Network which is the physical data link layer for vehicle internal and external diagnostic communications.
CAN1
Controller Area Network on Channel 1 which is the physical data link layer for vehicle internal and external diagnostic communications.
On Heavy-Duty trucks with a 9-pin connector, CAN Channel 1 is Pin C (yellow) and Pin D (green). Please see the Connector Info available in Data Monitor or Bus Statistics.
CAN2
Controller Area Network on Channel 2 which is the physical data link layer for vehicle internal and external diagnostic communications.
On Heavy-Duty trucks with a 9-pin connector, CAN Channel 2 is Pin H (yellow) and Pin J (green). Please see the Connector Info available in Data Monitor or Bus Statistics.
CAN3
Controller Area Network on Channel 3 which is the physical data link layer for vehicle internal and external diagnostics communications.
CAN Channel 3 is only available with a Type 2 9-pin connector and is Pin F (white) and Pin G (blue). CAN Channel 3 is multiplexed with J1708/J1587; therefore, a vehicle will have either CAN3 or J1708/J1587 but not both. Please see the Connector Info available in Data Monitor or Bus Statistics.
CARB
California Air Resources Board
C-CM
Cruise-Control Module
CDIM
Circuit Deactivation Ignition Module
CDPF
1) Catalyzed Diesel Particulate Filter
2) In International terminology, Cleaned Diesel Particulate Filter
CDPF Reset
In International terminology, Cleaned Diesel Particulate Filter Reset. The CDPF reset (Soot Load Reset) request provides the ability to reset the soot level after an aftertreatment component has been cleaned or replaced. International terminology for DPF Ash Accumulator Reset.
CGI
1) Clean Gas Induction
2) In International terminology, Compacted Graphite Iron
CID
Component Identifier
CKP
Crankshaft Position Sensor
CLM
Column Lock Module
CLRDIST
Distance Since Diagnostic Troubleshooting Codes Cleared
CLRWRMUP
Number of Warmups Since Diagnostic Troubleshooting Codes Cleared
CMP
Camshaft Position Sensor
CMPFM
Camshaft Position Sensor Status
CMT
Collision Mitigation Technology
CN
Bendix notation for compatibility number (indicates which
software versions are compatible)
CPC
Common Powertrain Controller
CPP/PNP
Clutch Pedal Position/Park-Neutral Position Switch
Cruise Control Limits
Minimum and maximum speeds a vehicle may maintain in cruise operation.
CTIS
Central Tire Inflation System
CTL
Control
CVD
Commercial Vehicle Diagnostics
CVT
Continuously Variable Transmission
Cylinder Cut-Off
See Cylinder Cut-Out.
Cylinder Cutout
See Cylinder Cut-Out.
Cylinder Cut-Out
A test which allows the enabling and disabling of individual engine cylinders. Audible differences can indicate cylinder issues. Also known as Cylinder Cut-Off.
D
DA
Drive Axle
DACMC
Digital Audio Control Module
DAS
Driver Assistance Systems (safety & collision avoidance related like radar, camera controllers)
DCDC
DC to DC Converter Control Module
DCSM
Driver/Dual Climate-Control Seat Module
DCU
1) Dosing Control Module
2) In Ford terminology, Reductant Control Module
DD
Detroit Diesel Electronic Controls. Also known as DDEC.
DDEC
Detroit Diesel Electronic Controls. Also known as DD
DDEC 7/10/13/17
Detroit Diesel terminology. Indicates year of EPA standard for
model.
DDM
Drivers Door Module
DEF
Diesel Exhaust Fluid. A consumable solution composed of Urea and Deionized water involved in the Selective Catalytic Reduction (SCR) process that lowers NOx concentration in diesel engine exhaust. Also known as Reagent or Reductant fluid.
DEF Doser Pump Override
The purpose of the Diesel Exhaust Fluid Doser Pump Override test is to run the diesel exhaust fluid (DEF) dosing unit through a dosing cycle to troubleshoot the dosing system. The test allows a technician to check the nozzle spray characteristics and the amount of DEF being delivered over a specified amount of time.
DEF Doser Pump Override Test
This test allows the user to verify that the Diesel Exhaust Fluid (DEF) dosing system is operating properly.
DEF Fluid
See DEF.
DEF Quantity Test
The purpose of the DEF Quantity test is to run the diesel exhaust fluid (DEF) dosing unit through a dosing cycle to troubleshoot the dosing system. The test allows a technician to check the nozzle spray characteristics and the amount of DEF being delivered over a specified amount of time.
DEF System Leak Test
The Diesel Exhaust Fluid System Leak Test is used to check the system connections, joints, fluid lines, and other components for external Diesel Exhaust Fluid (DEF) leaks. This is a mechanical test that will require the technician to inspect the system while the test is running.
DID
Data Identifier; identifies a parameter on UDS/ISO15765
DIU
Driver Interface Unit
DL
Drive Axle Left
DMM
Digital Multimeter
DOC
Diesel Oxidation Catalyst
DOC/DPF Replacement Reset
The DOC/DPF replacement reset provides the ability to reset an aftertreatment maintenance component that has been cleaned or replaced. Once a DOC is considered by the ECM to be “Face Plugged,” Aftertreatment dosing is disabled. After the DOC is replaced, the component’s value will need to be reset to clean to enable dosing and re-initiate active regeneration.
DOUT
Digital Output Driver
DPF
Diesel Particulate Filter
DPF Ash Accumulator Reset
This test is needed to reset the ash value after installing a new, cleaned, or remanufactured DPF filter. Detroit Diesel terminology for CDPF Reset.
DPF Ash Volume Reset
See DPF Ash Accumulator Reset.
DPF Regen
See DPF Service Regeneration.
DPF Service Regen
See DPF Service Regeneration.
DPF Service Regeneration
A DPF Service Regeneration is designed to lower soot (particulate matter) accumulation in the DPF in a controlled way. This results in lower filter pressure.
DPID
Dynamic Parameter Identifier
DR
Drive Axle Right
DRIVECNT
Valid Drive Counter
Drivetrain
Any component involved with power transmission starting at the engine power plant output and ending at the driven wheel/s. May include but not limited to; transmission/transfer case, driveline/s, yokes, u-joints, differential/s, axle shafts and wheel hubs.
DSM
Driver Front Seat Module
DSP
(Audio) Digital Signal Processing Module
DTC
Diagnostic Trouble Code
DTCCNT
Diagnostic Troubleshooting Code Count
E
EAS
1) Exhaust Emissions Controller
2) PACCAR terminology for ACM.
ECM
1) Electronic Control Module
2) Engine Control Module
ECT
Engine Coolant Temperature
ECT_FM
Engine Coolant Temperature Fault
ECU
Electronic Controller Unit
EGR
Exhaust Gas Recirculation
EGR DC
Exhaust Gas Recirculation Duty Cycle
EGR EVAL
Exhaust Gas Recirculation Evaluated
EGR_F
Exhaust Gas Recirculation Status
EGR Position
International terminology. Also known as Exhaust Gas Recirculation Valve Position.
EGR Throttle Test
This procedure temporarily sets the EGR throttle. The vehicle will reset the position automatically when the test is done.
EGR Valve CTL
International terminology. Also known as Engine Exhaust Gas Recirculation 1 Valve 1 Control 1.
EGR Valve Position Test
This procedure temporarily sets the position of the EGR valve. The vehicle will reset the position automatically when the test is done.
EGRVP
Exhaust Gas Recirculation Valve Position
EID
Event Identifier
EOT
Engine Oil Temperature
EOTFM
Engine Oil Temperature Status
EP
Exhaust Pressure
EP DSD
Exhaust Pressure Desired
EP_V
Exhaust Pressure Voltage
ESP
Electronic Stability Program
ETL
ATC Engine Torque Limiting
ETV
Engine Throttle Valve
Euro 4/5/6
The European emission standards utilized by vehicles in Europe and Australia.
EVAP
Evaporative Emission Control
EVAP Test
The EVAP test allows the user to detect leaks greater than 0.04 inches in length. It only applies to gasoline or flex-fuel engines. It will not work on diesel, natural gas, or propane engines.
Exhaust Back Pressure CTL
International terminology. Also known as Engine Exhaust Brake Actuator Command.
F
FAN VAR
Fan Speed Monitor
FAN VAR_F
Fan Speed Monitor
FANSS
Fan Speed
FANSSM
Cooling Fan Driver
FCDIM
Front Control/Display Interface Module
FCIM
Front Controls Interface Module
FDIM
Front Display Interface Module
FGT
Fixed Geometry Turbo
FICM
Fuel Injection Control Module
FICM_LPWR
Fuel Injection Control Module Logic Power. Fuel Injection Control Module logic power from the Fuel Injection Control Module relay.
FICM_MPWR
Fuel Injection Control Module Main Power. Fuel Injection Control Module injector power supply from the Fuel Injection Control Module relay.
FICM_VPWR
Fuel Injection Control Module Vehicle Power. Fuel Injection Control Module vehicle power from the ignition switch.
FICMSYNC
Synchronization from Fuel Injection Control Module
FLC
Forward Looking Camera
FLI
Fuel Level Indicator
FLM
Front Lighting Control Module
FLR
Forward Looking Radar
FMI
Failure Mode Indicator
FP
Fuel Pump
FPM
Fuel Pump Monitor
FRP
Fuel Rail Pressure
Fuel Injector Calibration
Fuel Injector Calibration allows the user to read and program calibration codes in the ECM when replacing or moving injectors between cylinders. The injector calibration code is marked on the
injector head by the manufacturer. All the injector calibration codes must be updated, if the ECM is replaced to ensure optimum fueling efficiency.
Fuel Injector Reset
Fuel injector reset allows the user to reset learned data when replacing or moving injectors between cylinders.
FUELPW
Fuel Pulse Width
Fuel System Leakage Test
This procedure is used to pressurize the fuel system and allows the user to check for fuel leaks. Fuel rail pressure will be increased to the same pressure used at the engine’s rated power. Increasing fuel rail pressure will make some fuel system leaks more obvious. This procedure may be used to check return flow from injectors, the rail pressure relief valve, or the fuel pump.
FUSO
MFTA or MFTBC, a part of Daimler Trucks Division. Also referred to as “Fuso.”
G
G – Sensor Calibration Test
Tests the Anti-Lock Brake / Traction Control Module (ABS) and displays a nearly instantaneous response from the ECU.
GEM
Generic Electronic Module
GEN-F
Generator 1 Output Fault
GENB_F
Generator 2 Output Fault
GENFIL
Generator Fault Indicator
GFM
Generic Function Module
GHG17
EPA Standard, Green House Gases 2017
GM
General Motors
GMLAN
Vehicle Bus protocol utilized by medium duty Isuzu vehicles
GPCTM
Glow Plug Coil on Time
GPL
Glow Plug Indicator
GPLTM
Glow Plug Indicator on Time
GPSM
Global Positioning System Module
GSM
Gear Shift Module
H
HCM
Headlamp Control Module
HD
Heavy Duty
HLD
Hold Solenoid (also referred to as inlet), part of the PMV
HSA
Hill Start Assist/Aid
HSWM
Heated Steering Wheel Module
HUD
Heads Up Display
HVAC
Heating Ventilation Air Conditioning
Hydrocarbon
A combustible compound of hydrogen and carbon which is a primary component in the makeup of many fossil fuels.
I
IAT
Intake Air Temperature (Mass Air Flow Assembly)
IAT2
Intake Air Temperature (Manifold Air)
IATFM
Intake Air Temperature Status
IC
Instrument Cluster. Also known as IPC
ICM
Information Center Module
ICP
Injection Control Pressure
ICP_DES
Injection Control Pressure Desired
ICUC
FUSO Instrument Cluster
Idle Shutdown Timer
Maximum amount of time a vehicle may remain idle before it automatically shuts off.
ILCM
Interior Lighting Control Module
IMP
Intake Manifold Pressure
Intake Air Heater Fuel Igniter
International terminology. Also known as Engine Cold Start Fuel Igniter Command.
Intake Air Heater Fuel Solenoid
International terminology. Also known as Engine Start Enable Device 1.
IPC
Instrument Cluster. Also known as IC.
IPMA
Image Processing Module A
IPMB
Image Processing Module B
IPR
Injection Pressure Regulator
ISO
International Organization for Standardization
ISO 14229
ISO standard that defines UDS services; application layer of the protocol. ISO 14229 uses a CAN physical data bus as the transport.
ISO 14230
ISO standard that defines the K-line physical data bus as well as the KWP 2000 application layer protocol.
On Heavy-Duty trucks with a 9-pin connector, the K-line physical data bus is Pin J (green). K-line is multiplexed with CAN Channel 2; therefore, a vehicle will have either CAN2 or K-line but not both. Please see the Connector Info available in Data Monitor or Bus Statistics.
ISO 15765
ISO standard that defines a network and transport layer protocol for vehicle diagnostics. ISO 15765 uses a CAN physical data bus as the transport. See the Connector Info available in Data Monitor or Bus Statistics for pinout information.
J
J1587
Application layer Heavy Duty vehicle bus protocol which runs on top of the J1708 physical data bus.
On Heavy-Duty trucks with a 9-pin connector, the J1708/J1587 is located at Pin F (white) and Pin G (blue). Please see the Connector Info available in Data Monitor or Bus Statistics.
J1708
Physical and Data Link layers Heavy Duty vehicle bus protocol which the J1587 application protocol uses as a transport.
On Heavy-Duty trucks with a 9-pin connector, the J1708/J1587 is located at Pin F (white) and Pin G (blue). Please see the Connector Info available in Data Monitor or Bus Statistics.
J1939
Heavy Duty vehicle bus protocol. The J1939 protocol which uses a CAN physical data bus as the transport. See the Connector Info available in Data Monitor or Bus Statistics for pinout information.
K
KAM
Keep Alive Memory
KAM (Keep Alive Memory) Reset
Tests the Powertrain Control Module and displays a nearly instantaneous response from the ECU.
Key-On Engine Running Self Test
Tests the Powertrain Control Module and Transmission Control Module and displays a nearly instantaneous response from the ECU.
KOEO
Key On Engine Off
KOEO Injector Buzz Test
Tests the Powertrain Control Module and displays a nearly instantaneous response from the ECU.
KOEO Injector Test
The KOEO Injector Test is an audible test that can assist in identifying if a suspected injector is functioning electrically. The test will activate each injector, and an audible buzz should be heard signaling that the injector solenoid is functioning.
KOEO Standard Test
The KOEO Standard Test will attempt to detect issues by cycling all actuators High and Low. Running this test is a precondition to running certain diagnostic tests, including the KOEO Injector Test.
KOER
Key On Engine Running
KOER Glow Plug Monitor Self Test
Tests the Powertrain Control Module and displays a nearly instantaneous response from the ECU.
KOER Standard Test
KOER Standard Test will check the performance of the highpressure Injection Control Pressure (ICP) / Fuel Rail Pressure (FRP) system. Running this test is a precondition to running certain diagnostic tests, including the Air Management Test.
KOER Switch Test
Tests the Powertrain Control Module and displays a nearly instantaneous response from the ECU.
KWP 2000
Key Word Protocol 2000, application communication layer for diagnostic systems using ISO-14230 (K-line) or ISO-15765 (HD_CAN1).
L
LAS
Lateral Acceleration Sensor
LDW
Lane Departure Warning
LTM
Liftgate/Trunk Module
M
MAF
Mass Air Flow. A mass air flow sensor is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine.
MAF_FM
Mass Air Flow Status
MAP
Manifold Air Pressure or Manifold Absolute Pressure
MAP_V
Manifold Absolute Pressure Voltage
MBE
Series of Mercedes-built HD engines.
MCM
Motor Control Module
MD
Medium Duty
MFDES
Mass Fuel Desired
MFTA
Mitsubishi Fuso Truck of America; wholly owned subsidiary of MFTBC.
MFTBC
Mitsubishi Fuso Truck and Bus Corporation
MGP
Manifold Gauge Pressure
MID
Message Identification Description. Identifies a control unit.
MIL
Malfunction Indicator Lamp
MIL_DIS
Distance Since Malfunction Indicator Lamp Activated
MISF_EVAL
Misfire Monitor
MP_LRN
Learned Misfire Correction
N
NH3
Anhydrous ammonia. Part of the SCR process, ammonia neutralizes nitrogen oxide (NOx) pollutants emitted by diesel engines.
NICB
National Insurance Crime Bureau
NM
Number of Misfires
NOx
Nitrogen Oxides; a common pollutant emitted by diesel engines.
O
OBD
On-Board vehicle Diagnostics
OBDII
On-Board Diagnostics, level II
OCS
Occupant Classification System Module
OEM
Original Equipment Manufacturer
ORS
Off-Road Switch
P
PAM
Parking Aid Module
Parked DPF Regeneration
See DPF Service Regeneration.
Parked SCR Efficiency Test
The purpose of the Parked SCR Efficiency test is to validate SCR system integrity from engine warm up through NOx efficiency. A technician may use this test to diagnose problems with SCR catalyst efficiency or DEF concentration.
PATSENABL
Passive Anti-Theft Enabled
PBA
Park Brake Applied
PCM
Powertrain Control Module
PCSM2
Passenger Climate-Control Seat Module 2
PCV
Pressure Control Valve
PDM
Passenger Front Door Module
Performance Check Low Temp ATD
This service preforms a forced Parked DPF Regeneration on the engine and disables HC dosing. This is used to troubleshoot NOx Sensor Drift issues.
PID
Parameter Identification Description. Identifies a parameter.
PLV
Pressure Limiting Valve
PM
Pressure Limiting Valve
PMV
Pressure Modulator Valve (also referred to as Pressure Control Valve or PCV)
PNP
Park/Neutral Position Switch
Pneumatic Test
Tests the Vehicle Dynamics Module and displays a nearly instantaneous response from the ECU.
Power Balance Test
The power balance test allows the user to ensure the cylinders are in proper operational balance. This test resembles a what other manufacturers refer to as a cylinder cut-out test, though it graphs different data.
Powertrain
Any component involved with the essential power generating functions of the engine power plant; sometimes extending to emissions systems or power transmission, ending at the transmission.
PPID
Proprietary Parameter Identification Description. Identifies a parameter.
PRB
Power Running Board
PSCM
Power Steering Control Module
PSI
Power Solutions International
PSID
Proprietary Subsystem Identification Description.
PTO
Power Take Off
Q
QVC
Quality Control Valve
R
RACM
Rear Audio Control Module
RBM
Running Board Control Module
RCM
Restraint Control Module
RCU
Audio Rear Control Unit
Reagent
See DEF.
Reductant
See DEF.
REL
Release Solenoid (also referred to as exhaust or outlet), part of the Pressure Modulator Valve or PMV
Relative Compression Test
Passenger Front Door Module
RET
Retarder Disable Relay output
RETM
Rear Seat Entertainment Module
RFA
Remote Function Actuator
RGTM
Rear Gate/Trunk Module
RHVAC
Rear Heating Ventilation Air Conditioning
RLCMA
Rear Lighting Control Module A
Road Speed Limits
Minimum and maximum speeds a vehicle may maintain in driving operation.
RP1210
TMC’s Windows Communication API – Recommended Practice; various levels of compliance (A, B, C), JPRO is RP1210C compliant.
RP1210A
TMC’s Windows Communication API – Recommended Practice
RPM
Revolutions Per Minute
RPMSD
Desired Idle RPM
RSL
Road Speed Limit. Minimum and maximum speeds a vehicle may maintain in driving operation.
RSP
Roll Stability Program
S
SA
1) Source Address
2) In Bendix terminology, Steer Axle
SAS
Steering Angle Sensor
SASM
Steering Angle Sensor Module
SCCM
Steering Column Control Module
SCCS
Speed Control Switches
SCME
Seat Control Module E
SCR
Selective Catalytic Reduction
SCR Airless Doser Self Check
This service performs a self-check of the SCR Airless Dosing System. It is needed to verify proper DEF pump system operation.
SCR Dosing Measurement Test
This procedure evaluates the SCR system’s reductant dosing capabilities
SCR Faults Reset
The SCR Faults Reset request allows the user to clear SCR related faults which would not be able to be cleared with a normal clear faults request.
SCR Output Component Test
This service test is used as a sanity check for components related to the Aftertreatment system. The SCR heaters, Pressure Limiting Unit, Coolant Valve, Intake Throttle Valve, Fuel Cutoff Valve, and HC Doser are commanded ON for a brief period and individual fault codes will be set during the test if a component
fails.
SCR Visual Leak Test
This procedure prepares and pressurizes the SCR system, so it can be inspected visually for leaks.
SD
Safety Direct
SDARS
Satellite Digital Audio Receiver System
SDP
Safety Direct Processor
Sensor Initialization
Tests the Anti-Lock Brake / Traction Control Module (ABS) and displays a nearly instantaneous response from the ECU.
SID
Subsystem Identification Description. Identifies a component.
SJB
Smart Junction Box
SL
Steer Axle Left
SLR
Side Looking Radar
SLS
Stop Lamp Switch
SOBDM
Secondary OBD Control Module A
SODL
Side Obstacle Detection Control Module – Left
SODR
Side Obstacle Detection Control Module – Right
SPN
Suspect Parameter Number and represents the identity of a J1939 parameter
SR
Steer Axle Right
SRS
Safety Restraint System
SSAM
FUSO Gateway module
T
TBC
Trailer Brake Control Module
TC1 Turbine Outlet Pressure
International terminology. Also known as Engine Turbocharger 1 Turbine Outlet Pressure.
TC2
Turbocharger control valve that limits air flow from the turbo
TCCM
Transfer Case Control Module
TCL
Traction Control Lamp
TCM
Transmission Control Module
TCS
Traction Control Switch
TCU
Telematic Control Unit Module
TCV
Traction Control Valve
TDC
Top Dead Center
TMC
Technology and Maintenance Council
TPMS
Tire Pressure Monitoring System
TRM
Trailer Module
TSR
Traffic Sign Recognition
U
UDS
Unified Diagnostic Services
UI
User Interface
Urea
Urea is used in SNCR and SCR reactions to reduce the NOx pollutants in exhaust gases from combustion from Diesel, dual fuel, and lean-burn natural gas engines
V
Variant
1) Model or version deviated from the standard.
2) A Detroit Diesel specific ECU software version in the DDEC EPA10 and EPA13 platforms.
VDM
Vehicle Dynamics Module
VDS
Vehicle Dynamics Systems (primarily ABS controllers)
Venturi
A section of pipe used in conjunction with a Differential Pressure Sensor to measure differential pressure.
VFDES
Volume Fuel Desired
VGT
Variable Geometry Turbocharger
VGT_F
Variable Geometry Turbocharger Fault
VGTDC
Variable Geometry Turbocharger Duty Cycle
VGT Electronic Actuator Installation and Calibration
This commanded test allows the technician to safely install and calibrate a new VGT Electronic Actuator. The test consists of two separate procedures. First, the actuator must be procedurally installed while the actuator is physically disconnected from the turbocharger. Second, the actuator must be physically reinstalled to the turbocharger to calibrate it. The calibration cannot be performed until the installation procedure has completed successfully. The ignition must be on and the engine off to run these operations.
VGT Hysteresis Test
The Variable Geometry Turbocharger (VGT) Hysteresis Test can assist in diagnosing issues related to VGT Actuator movement. This test will provide pass or fail results
VREF
Reference Voltage
VSM
Vehicle Security Module
VSS
Vehicle Speed
VTEC
Variable Valve Timing and Lift Electronic Control
VTG
Variable-Turbine Geometry
VVT
Variable-Vane Turbine
W
WAC
Wide Open Throttle A/C Cutoff
WCI
Warning Category Indicator
WFS
Water in Fuel Sensor
WIF
Water in Fuel Sensor
Wiper Control Test
Tests the Generic Electronics Module and Smart Junction Box and displays a nearly instantaneous response from the ECU.
Wiper Washer Rear Test
Tests the Generic Electronics Module and Smart Junction Box and displays a nearly instantaneous response from the ECU.
WMI
World Manufacturer Identifier
WOT
Wide Open Throttle
WSS
Wheel Speed Sensor
X
xS/yM
Vehicle configuration with x wheel speed sensors and y modulator valves
Y
YC
Yaw Control
YRS
Yaw Rate Sensor (includes the lateral acceleration sensor)