| 2WD | Two Wheel Drive |
| 4WD | Four Wheel Drive |
| AAMOF | As A Matter Of Fact – used by many on mail lists and message boards |
| ABS | Anti-lock Brake System: Modulates braking pressure to control wheel lockup |
| ACM | Airbag Controller Module: monitors sensors and deploys airbag(s) in the event of an accident |
| ACT | Air Charge Temperature |
| ACV | Thermactor Air Control Sensor |
| AFC | Air Fuel Control: used on 94 – 98 diesels to control fuel rate at low boost |
| AOD | Automatic Overdrive Transmission |
| APP | Accelerator Pedal Position |
| APPS | Accelerator Pedal Position Sensor: used on ISB diesel for electronic throttle control |
| ASD | Auto Shut Down: relay control system used to shut down engine |
| AXOD | Automatic Overdrive Transmission |
| BAT | Battery Voltage |
| BCM | Body Control Module |
| BDC | Bottom dead center – the lowest position of a piston in the cylinder occurs when the crank pin is at bottom dead center |
| BE | model designation for the Quad Cab Ram pickup |
| BFSC | Brake Specific Fuel Consumption – pounds of diesel fuel consumed to produce 1 HP for 1 hour |
| BHAF | Big Honkin’ Air Filter – oversized filter used by the diesel gang |
| BOO | Brake ON/Off Switch |
| BOMB | Better off modified baby! – used by the diesel gang who hop up their engines |
| BP | Barometric Pressure Sensor |
| BR | Model designation for standard cab Ram pickup (and maybe the CC Pickup) |
| BTW | By The Way – used on mail lists and message boards |
| CAB | Controller Anti-lock Brake: |
| CARB | California Air Rescouces Board: environmental regulatory agency in CA |
| CCD | Chrysler Collision Detection: data bus system used by the airbag and the anti-lock brake systems |
| CCD | Computer Controlled Dwell |
| CCO | Converter Clutch Overdrive |
| CDR | Crankcase Depression Regulator |
| CEL | Check Engine Light |
| CFI | Central Fuel Injection |
| CHMSL | Center High Mounted Stop Light: 3rd brake light at top of truck cab |
| CHT | Cylinder Head Temperature |
| CID | Cubic Inch Displacement |
| CID | Cylinder Identification Sensor |
| CKP | Crank Position Sensor: detects position and speed of engine crankshaft |
| CMP | Cam Position Sensor: detects position of camshaft |
| CPL | Control Part List: listing of engine parts and timing specifications for a Cummins engine |
| CPS | Camshaft Position Sensor: detects position of camshaft |
| CTD | Cummins turbo diesel – used by many on mail lists and message boards |
| CTM | Central Timer Module: controls RKE, chime, courtesy lamps, Speed sensitive Intermittent wipers, enhanced accident response, VTSS |
| DAB | Driver Air Bag module: airbag and firing system mounted in the steering wheel center |
| DC | DC or D/C = DaimlerChrysler – used on mail lists and message boards |
| DD1, 2, 3 | DD1, DD2, DD3 = Diesel Dynamics Stage 1 (2 or 3) injectors |
| DEE | Order code for the NV5600 6 speed manual transmission |
| DLC | Data Link Connector: used to interface diagnostic equipment with vehicle electronics |
| DRB | scan tool used to obtain diagnostic trouble codes (DTC) from controller modules |
| DRB III | new generation scan tool used to obtain diagnostic trouble codes (DTC) |
| DTC | Diagnostic Trouble Code: Fault code set by control module when sensor data is not as expected |
| DTT | Diesel Transmission Technologies – aftermarket auto trans upgrade specialist |
| EBC 2 | RWAL brake system |
| EBC 325 | four wheel anti-lock brake system |
| ECA | Electronic Control Assembly |
| ECM | Engine Control Module: microprocessor based module that controls various engine functions |
| ECT | Engine Coolant Temperature Sensor |
| EDF | Electric Drive Fan Relay |
| EDIS | Electronic Distributor |
| EEPROM | Electrically Erasable Programmable Read Only Memory: controller reprogrammable memory |
| EGO | Exhaust Gas Oxygen Sensor |
| EGR | Exhaust Gas Recirculation: used to reduce combustion temperature and pressure to control Oxides of Nitrogen emissions |
| EGRC | EGR Control Solenoid |
| EGT | Exhaust Gas Temperature: Important measurement for hard working diesel engines |
| EMCC | Electronically Modulated Converter Clutch: used for torque converter lockup control in the automatic transmission |
| EOT | Engine Oil Temperature |
| ETC | Order code for standard diesel engine |
| ETH | 2001-2002 Order code for the High Output diesel engine |
| ETH/DEE | Slang for the 2001 HO diesel with the NV5600 six speed |
| EVA | Electronic Vibration Analyzer – used to diagnose chassis, engine, and drivetrain vibrations |
| EVP | EGR Position Sensor |
| EVR | EGR Valve Regulator |
| EVR | Electronic Voltage Regulator: circuitry in the PCM which controls battery charging and alternator functions |
| FDM | Fuel Delivery Module |
| FP | Fuel Pressure – abbreviation used on message boards |
| FPCM | Fuel Injection Pump Control Module: controls injection pump on 98+ diesel engines |
| FPM | Fuel Pump Monitor |
| FRP | Fuel Rail Pressure |
| FWIW | For What It’s Worth – used by many on mail lists and message boards |
| GAWR | Gross Axle Weight Rating: maximum safe load capacity of an axle measured at the ground. |
| GCW | Gross Combined Weight: total weight of equipped truck, payload, trailer, water, and equipment. |
| GCWR | Gross Combined Weight Rating: maximum allowable GCW |
| GVW | Gross Vehicle Weight: total curb weight of the truck and payload. |
| GVWR | Gross Vehicle Weight Rating: maximum allowable GVW |
| HCU | Hydraulic Control Unit: modulates the brake pressure for ABS |
| HEGO | Heated Exhaust Gas Sensor |
| HD | Heavy Duty |
| HX35 | Holset turbocharger used for most 94+ diesel Rams. |
| HX40 | Holset turbocharger intended for C engines, but used by some performance enthusiasts on the Ram’s B engine |
| HY35 | Holset turbocharger used on 2000+ diesel Rams with the automatic transmission |
| IAT | Intake Air Temperature Sensor |
| IAC | Idle Air Control valve: used for emissions control on gasoline engines |
| ICM | Integrated Controller Module |
| IDM | Ignition Driver Module |
| IMHO | In My Honest Opinion – used on mail lists and message boards |
| IMO | In My Opinion – used on mail lists and message boards |
| IP | Instrument Panel |
| ISB | Interact System B: Cummins designation for the 24 Valve "B" series diesel introduced to the 1998 Ram |
| ISC | Idle Speed Control |
| ITS | Idle Tracking Switch |
| IVS | Idle Validation Switch (Diesel) |
| JTEC | Jeep, Truck Engine Control: Combined engine and transmission control module |
| KAM | Keep Alive Memory |
| KOEO | Key On Engine Off |
| KOER | Key On Engine Running |
| KDP | Killer dowel pin inside the timing gear case on 94-98 12 valve diesels. If this pin falls out of its blind hole, the repair is expensive. |
| KS | Knock Sensor |
| LD | Light Duty |
| LDP | Leak Detection Pump: used in the 4 wheel ABS valve assembly |
| LED | Light Emitting Diode: semiconductor lamp used for displays and warning lamps |
| LOAD | Engine Load |
| LOL | Lots of Laughs – used by many on mail lists and message boards |
| LOS | Limited Operation Strategy |
| LPD | Line Pressure Desired |
| LSD | Limited Slip Differential |
| LUS | Lock-up Solenoid |
| LWB | Long Wheelbase (or LB, for long box or long bed) |
| MAF | Mass Airflow |
| MAFV | Mass Airflow Sensor Voltage |
| MAP | Maximum Absolute Pressure sensor: used for emission control |
| MAT | Manifold Air Temperature |
| MCU | Microprocessor Control Unit |
| MDS(2) | Mopar Diagnostic System: diagnostic computer system for service departments |
| MIC | Mechanical Instrument Cluster: Instrument cluster controller and display system |
| MIL | Malfunction Indicator Light: used by engine control system to indicate a problem to the driver |
| MPH | Miles Per Hour |
| MPI | Multi Port Injection: Each cylinder has it’s own fuel injector in the intake port. |
| MTV | Manifold Tuning Valve: used to vary the manifold runners for engine performance and emission control |
| O2S | Oxygen Sensor: measures oxygen content of exhaust stream. Used to modify air to fuel ratio for emission control |
| OBD | On Board Diagnostics: Ram engine and powertrain self diagnostic system |
| OBDII | On Board Diagnostics II: enhanced diagnostic system to meet 1997 EPA requirements |
| OHC | Overhead Camshaft |
| OSS | Output Shaft Speed |
| OTOH | On The Other Hand – used by many on mail lists and message boards |
| P7100 | Fuel injection pump used with 1994 – 1998 Ram 12 valve diesel engines |
| PAB | Passenger Air Bag module: airbag and firing mechanism on the passenger side |
| PADS | Passenger Airbag Disarm Switch: Override switch to disable PAB when children are riding in front seat |
| PCI | Programmable Communications Interface |
| PCM | Powertrain Control Module: microprocessor based module that controls engine and drivetrain functions |
| PCV | Positive Crankcase Ventilation: vacuum system used to control crankcase (blowby) emissions |
| PDC | Power Distribution Center: Fuse and relay power distribution center located under the hood. |
| PEP | Peripheral Expansion Port |
| PFE | Pressure Feedback EGR Sensor |
| PIP | Profile Ignition Pickup |
| PSPS | Power Steering Pressure Switch |
| PSI | Pounds Per Square Inch: pressure measurement |
| RAM | Random Access Memory: read and write memory used by controllers for data storage |
| RKE | Remote Keyless Entry: remote operated door lock system |
| RPM | Revolutions Per Minute: the speed of a turning shaft or rotor |
| ROFL | Rolling On Floor Laughing – used on mail lists and message boards |
| ROFLMAO | Rolling On Floor Laughing My A$$ Off – used on mail lists and message boards |
| ROM | Read Only Memory: controller "hard" memory that is permanently written – EEPROM may be reprogrammed with appropriate diagnostic tools |
| RWAL | Rear Wheel Anti Lock brakes: |
| SBEC | Single Board Engine Controller |
| SCI | Serial Communications Interface: Used by the PCM for diagnostics and for communication with other controller modules |
| SCTM | Seatbelt Timer Control Module: inertia latching seatbelt controller built into Quad Cab Models |
| SES | Service Engine Soon |
| SIL | Shift Indicator Light |
| SKIM | Sentry Key Imobilizer Module: disables engine start until Secret Key is entered using DRB scan tool !!! Required when a new PCM is installed in a vehicle |
| SPARK | Spark Advance/Retard |
| SPOUT | Spark Output Signal (from ECA) |
| STAR | Self Test Automatic Readout |
| SWB | Short Wheelbase (or SB, for short box or short bed) |
| SWMBO | She Who Must Be Obeyed – used by men on mail lists and message boards to refer to their wife or girlfriend |
| TAPS | Throttle Angle Position Sensor |
| TBI | Throttle Body Injector: Electronic fuel injector located in normal place of a carburator. |
| TC | Torque Converter |
| TCC | Torque Converter Clutch |
| TCM | Transmission Control Module: May not be used on Ram trucks |
| TDC | Top Dead Center: the highest position of a piston in the cylinder occurs when the crank pin is at top dead center |
| TDR | Turbo Diesel Register – club for Ram diesel owners – with a website, magazine, and rallys |
| TFI | Thick Film Ignition System |
| TFT | Transmission Fluid Sensor |
| TGS | Top Gear Switch |
| THS | Transmission Temperature Switch |
| TIA | Thanks In Advance – used by many on mail lists and message boards |
| TPS | Throttle Position Sensor |
| TQC | Torque Control |
| TRS | Transmission Range Sensor |
| TSB | Technical Service Bulletin: repair and technical information bulletins to assist service departments |
| TSS | Turbine Shaft Speed |
| TST | Diesel engine power enhancement company run by Mark Chapple |
| TTS | Transmission Temperature Switch |
| TTT | To The Top – – used on message boards to bring a thread to the top |
| VAF | Vane Air Flow Sensor |
| VAT | Vane Air Temperature |
| VB | Valve body – auto trans |
| VCT | Variable Cam Timing |
| VE | Bosch Distributor type injection pump used on 89-93 Ram diesel engines |
| VIN | Vehicle Identification Number: unique serial number assigned to each vehicle |
| VP44 | Bosch electronic fuel injection pump used on 1998+ Ram diesel engines |
| VSS | Vehicle Speed Sensor/Signal |
| VTSS | Vehicle Theft Security System: anti theft system with engine disable, alarm, and door lock features |
| YMMV | From the Your Mileage May Vary disclaimer- used on mail lists and message boards to indicate that your experience may be different |
| WAC | WOT A/C Cut-off Switch |
| WIF | Water In Fuel sensor: detection system for water in fuel filter on 1994+ diesel engines |
| WOT | Wide Open Throttle: maximum throttle position |
Glossary of Diesel Abbreviations
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