Here is a list of commonly used acronyms that you may encounter while working on your Lincoln. Impress your friends by opening your hood and pointing to various parts in automotive shorthand!

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3V   Three Valves per engine cylinder 4V   Four Valves per engine cylinder 4WD_POS 1/2/3/4   4-Wheel Drive Motor Position (1-4) 4WDIWE   4-Wheel Drive Integrated Wheel Ends 4WDL   4-Wheel Drive Low Switch 4WDL_IL   4-Wheel Drive Low Indicator Lamp 4WDMCS   4-Wheel Drive Mode Command Switch 4WDSWRTN   4-Wheel Drive Mode Command Switch Return 4WDT_IL   4-Wheel Drive Tow Indicator Lamp 4x4L   4x4 Low

A

A/C   Air Conditioning A/CC   Air Conditioning Clutch A/CCR   A/C Clutch Control Relay A/D   Analog-to-Digital. Analog-to-Digital signal conversion. A/T   Automatic Transmission ABS   Anti-Lock Brake System ACCS    Air Conditioning Cycling Switch ACD    Air Conditioning Demand. A signal input to the PCM from the air conditioning control panel. ACDS   Air Conditioning Diagnostic Switch (refrigerant containment switch) ACET   Air Conditioning Evaporator Temperature (may also be referred to as Evaporator Air Discharge Temperature) ACP   Air Conditioning Head Pressure or A/C cycling switch input state ACP V   Air Conditioning Pressure Volts. A voltage input to the PCM from the ACP switch or sensor. ACPSW   Air Conditioning Pressure Switch ACPT   Air Conditioning Pressure Transducer (Switch) ADC   See ATDC. AFCM    Alternative Fuel Control Module AIR Secondary Air Injection Air Diverter    Air Diverter Valve. Part of the EAIR system. Diverts fresh air to the exhaust system when the electric air pump is commanded on. AIR EVAL   Air System Evaluated. Displays a YES or NO status indicating whether the Air System has been evaluated for OBD (On-Board Diagnostic) purposes. Air/Fuel Ratio    Air-to-fuel mixture ratio. An air-to-fuel mixture that is 14.7 AIRB   Secondary Air Injection Bypass AIRM   Secondary AIR pump monitor ALTCOM   Alternator Command ALTMON   Alternator Monitor Ambient Air Temperat    Temperature of the air surrounding an object. Analog (Electrical/E    An electrical signal that may obtain any value within the voltage limits of the signal. APP   Accelerator Pedal Position ARB   Air Resource Board ARPMDES   Ancillary RPM Desired. RPM required to maintain the vehicle speed commanded by the Speed Control Command Switch (SCCS) inputs. ASCII   American Standard Code Information Interchange. ATDC   After Top Dead Center. The location of the piston after it has reached the top of its stroke. Measured in degrees of crankshaft rotation. AWD   All-Wheel Drive

B

BARO    Barometric Pressure Base Idle    Idle RPM determined by the throttle lever hardset on the throttle body. Base Timing    Spark advance in degrees before top dead center of the base engine without any control from the PCM. BATTEMP    Battery Temperature Battery Positive Volt    The positive (+) voltage from the battery or any circuit connected directly to the battery. BJB    Battery Junction Box BOB    Breakout Box. A test device which connects in series to the PCM and PCM harness. BPA    Brake Pedal Applied. Typically located on the braking system master cylinder. Can be hydraulic or electric. BPP   Brake Pedal Position BPS    Brake Pedal Switch/Speed Control Deactivation. BTDC    Before Top Dead Center. The location of the piston before it has reached the top of its stroke. Measured in degrees of crankshaft rotation. Bus + or Bus     Multiplex circuits that carry standard corporate protocol (SCP) or controller area network (CAN) data from module to module and to the data link connector (DLC). BVREF    Buffer Voltage Reference. A dedicated circuit that provides approximately a 5.0 volt signal used as a reference by certain sensors.

C

CAC  Charge Air Cooler. Formerly known as intercooler. A device which lowers the temperature of pressurized intake air. CAFE  Corporate Average Fuel Economy. A set of federal requirements and regulations which govern fuel economy standards. CAN  Controller Area Network CANP  Canister Purge Solenoid CANVNT  Canister Vent CAT EVAL  Catalyst System Evaluated. This item indicates YES when the Catalyst Efficiency Monitor has successfully completed. Catalyst  Catalytic converter. An in-line exhaust system device used to reduce the level of engine exhaust emissions. CCM  Comprehensive Component Monitor CCS  Coast Clutch Solenoid CCSF  Coast Clutch Solenoid Fault. Displays a YES if a fault exists. CD A through J  Coil Driver 1 through 10. Centralized Testing  State government operation. Provides inspection/maintenance (IM) and safety inspections. CGND  Case Ground. Provides a ground source for the PCM case. CHT  Cylinder Head Temperature. Units are displayed in either degrees Celsius or Fahrenheit. CHTIL  Cylinder Head Temperature Indicator Lamp CHTV  Cylinder Head Temperature Voltage CKP  Crankshaft Position CKP+, CKP-  CKP+ is the CKP sensor signal circuit. CKP- is the signal return circuit. CL  Closed Loop. An operating condition or mode which enables operation based on sensor feedback. CMCV  Charge Motion Control Valve CMCVM  Charge Motion Control Valve Monitor CMP, CMP1, CMP2  Camshaft Position CMPFM  Camshaft Position Failure Mode. Indicates when the PCM identifies a CMP fault. CMS  Catalyst Monitor Sensor. The downstream HO2S. CMVSS  Canadian Motor Vehicle Safety Standards. CO  Carbon Monoxide. A colorless, odorless, and toxic gas that is a component of auto exhaust emissions. CO2  Carbon Dioxide. A colorless, odorless gas that is a normal by-product of the combustion of fuel. Coil  A device consisting of windings around an iron core. In a spark ignition system, designed to increase voltage. Cold Soak  Time given to a vehicle to sit at a low temperature, typically below 20°C (68°F), until the temperature of external and internal components stabilize. CONT  Continuous Memory. The portion of keep alive memory (KAM) used to store DTCs generated during the continuous memory self-test. Continuous Memory Se  A continuous test of the EEC system conducted by the PCM whenever the vehicle is operating. COP  Coil On Plug. Ignition coil on plug assembly. CPP  Clutch Pedal Position CPP Switch  Clutch Pedal Position Switch. Located on the clutch pedal and detects when the clutch pedal is pressed. CQIS  Common Quality Indicator System CSE GND  Case Ground CT  Closed Throttle. A mode when the PCM varies the pulse width of the fuel injectors to obtain the air/fuel mixture appropriate for closed throttle operation. CTO  Clean Tach Output. Signal used to drive the instrument panel tachometer.

D

DC   1. Direct Current. Electric current flowing in one direction. 2. Duty Cycle. The voltage measurement of ON time versus the full cycle period, expressed in percent. DCL   Data Communication Link. A communication path between various in vehicle electronic modules. DI   Distributor Ignition. A system in which the ignition coil secondary circuit is sequenced by a distributor. Digital Controls process information by switching the current or voltage ON and OFF. DIS   Distributorless Ignition System. A system in which the ignition coil secondary circuit is sequenced without a distributor. DLC   Data Link Connector. J1962 connector providing access to vehicle diagnostic information. DMM   Digital Multimeter DOHC Dual Overhead Cam.   An engine configuration that uses 2 camshafts positioned above the valves. DOL   Data Output Line. A circuit that sends certain information from the PCM to the instrument cluster. DPFEGR   Differential Pressure Feedback Exhaust Gas Recirculation. A system that uses a pressure transducer to control the operation of the exhaust gas recirculation (EGR) vacuum regulator valve. DRI   Deposit Resistant Injector. A fuel injector designed to prevent the build-up of carbon and other unwanted deposits. DTC   Diagnostic Trouble Code. An alpha/numeric identifier for a fault condition identified by the OBD system. DTM   Diagnostic Test Mode. A level of capability in an OBD system.

E

E-85   Fuel containing 85% ethanol alcohol. EAIR   Electric Secondary Air Injection. A pump-driven system for providing secondary air using an electric air pump. EAIRM   Electric Air Pump Monitor ECT   Engine Coolant Temperature. Displayed in either Celsius or Fahrenheit. ECTV   Engine Coolant Temperature Voltage ECU   Electronic Control Unit. A module that handles the control strategy and monitors system inputs or outputs. EEC   Electronic Engine Control EEC-IV   Fourth-generation EEC system. EEC-V   Fifth-generation EEC system. EFTA   Engine Fuel Temperature A (bank 1) EFTAV   Engine Fuel Temperature A Voltage EFTB   Engine Fuel Temperature B (bank 2) EFTBV   Engine Fuel Temperature B Voltage EGR   Exhaust Gas Recirculation. A process in which a small amount of exhaust gas is routed into the combustion chamber. EGR EVAL   Exhaust Gas Recirculation System Evaluated. EGR EVAL will display YES when the monitor is complete. EGRMC (1-4)   Electric Exhaust Gas Recirculation Motor Control EGRMDSD   Electric Exhaust Gas Recirculation Motor Desired position. The PID name used to operate the EEGR valve. EGRT   Exhaust Gas Recirculation Valve Temperature. A temperature sensor that is threaded into the bottom of the intake plenum. EGRVR   Exhaust Gas Recirculation Vacuum Regulator. A solenoid which controls vacuum to the EGR valve by varying the duty cycle signal from the PCM. EGRVRA   Exhaust Gas Recirculation Vacuum Regulator Actual (volt). The actual state of the commanded output. EGRVRF   Exhaust Gas Recirculation Vacuum Regulator Fault. Represents whether a fault exists in the EGRV circuit. EI   Integrated Electronic Ignition. An electronic ignition system that has the ignition control module (ICM) integrated into the PCM. EI-HDR   Electronic Ignition-High Data Rate. Formerly known as Electronic Distributorless Ignition System. EI-LDR   Electronic Ignition-Low Data Rate. Formerly known as Distributorless Ignition System. Electric VMV   Electric Vapor Management Valve also known as the EVAP canister purge valve. EMI   Electromagnetic Interference. Usually caused by ignition voltage spikes, solenoids, relay operation, or noisy generator contacts. EOL   End of Line. A system designed specifically for use at assembly plants to make sure all new vehicles conform to design specifications. EOT   Engine Oil Temperature EPA   Environmental Protection Agency (United States Government) EPC, EPC1, EPC2   Electronic Pressure Control EPCV   Electronic Pressure Control Volts EPROM   Erasable Programmable Read-Only Memory. An electronic component in the PCM that allows the electronic storage of information. ESM   EGR System Module ESOF   Electronic Shift-on-the-Fly ESS   Electronic Shift Scheduling ETB   Electronic Throttle Body ETC   Electronic Throttle Control ETCIL   Electronic Throttle Control Indicator Lamp ETCVREF   Voltage Reference (5V) for ETC (APP VREF, TP VREF). EVAP   Evaporative Emissions. A system to prevent fuel vapor from escaping into the atmosphere. EVAPCP   Evaporative Canister Purge Solenoid. A solenoid which controls the venting of fuel vapor from the evaporative emissions canister into the intake manifold for combustion. EVAPCPF   Evaporative Canister Purge Solenoid Fault. Identifies whether an electrical fault exists for the current commanded state. EVAPCV   Evaporative Canister Vent Solenoid. A solenoid which seals the EVAP system from the atmosphere during the EVAP monitor test. Evaporative Emission   An evaporative emission canister containing activated charcoal which absorbs and holds fuel vapors. EVAPPDC   Evaporative Canister Purge Duty Cycle. The duty cycle commanded to the EVAP canister purge solenoid by the PCM. EVO   Electronic Variable Orifice EWP   Electric Water Pump Exciter Ring   A toothed or notched iron or steel disk.

F

FAN   Fan Speed FANSS   Fan Speed Sensor FC, FC1, FC2, FC3   Fan Control FCIL   Fuel Cap Indicator Lamp. Indicates that the fuel filler cap is not properly installed. FCS   Fuel Control Solenoid FCV   Fan Control-Variable FEAD   Front End Accessory Drive FEPS   Flash EEPROM Programming Signal. An 18-volt DC signal input from the diagnostic tool used by the PCM to initiate programming. FFV   Flexible Fuel Vehicle FICM   Fuel Injector Control Module FIM   Fuel Indicator Module FIRTFT   Fix It Right The First Time FLI   Fuel Level Input. Provides information on the amount of liquid fuel in the fuel tank. Used by the EVAP monitor to calculate the fuel tank vapor volume. Displayed as a percentage. FLI V   Fuel Level Input Voltage FMEM   Failure Mode Effects Management. Operating strategy that maintains limited vehicle function in the event of a PCM or EEC component failure. FP   1. Fuel Pump. Indicates whether the pump has been commanded ON or OFF by the PCM.  2. Fuel Pump (Modulated). Fuel pump duty cycle percentage. FPC   Fuel Pump Control FPDM   Fuel Pump Driver Module. A module that controls the electric fuel pump. FPF Fuel Pump Fault. Identifies whether a fault exists in the FP circuit. FPM   Fuel Pump Monitor. Monitors the fuel pump/circuits for faults. Freeze Frame A block of memory containing the vehicle operating conditions at a specific time. FRP   Fuel Rail Pressure FRP V   Fuel Rail Pressure Voltage. A voltage input to the PCM from the fuel rail pressure sensor. FRT   Fuel Rail Temperature FSC   Fail-Safe Cooling FSSW   Fuel Select Switch. An output signal between the PCM and FICM which determines the fuel delivery mode. FTP   Fuel Tank Pressure FTP V   Fuel Tank Pressure Voltage. From the FTP transducer. FUEL PR   Fuel Pressure. Measurement of the force of the fuel delivered by the fuel pump. Fuel Tank Vapor Valv   A valve mounted in the top of the fuel tank that vents excess vapor and pressure from the fuel tank into the evaporative emission control system. FUELPW   Fuel Pulse Width. Displays the commanded pulse width at the time of the last data update. FUELPW1   Fuel Injector Pulse Width #1. Corresponds to injectors normally affected by HO2S1. FUELPW2   Fuel Injector Pulse Width #2. Corresponds to injectors normally affected by HO2S2. FUELSYS   Fuel System Status (OPEN/CLOSED Loop). Formerly known as LOOP. FWD   Front Wheel Drive

G

GEM   Generic Electronic Module GEN   Generator GENF   Generator Output Fault GENFDC   Generator Field Control Output GENIL   Generator Indicator Lamp. A PCM output signal used to control the charging system indicator. GENLI   Generator Load Input. An input signal utilized by the PCM to monitor charging system operation and determine the system voltage. GENRC   Generator Regulator Control. A PCM output signal used to control the voltage regulator. GFS   Generator Field Signal GND   Ground GPM   Grams per Mile. Also known as Gallons per Minute. Green State Vehicle   Formally known as California Emissions. A vehicle that is equipped with California on-board diagnostics. GSS   Gear Select Solenoid GVW   Gross Vehicle Weight

H

Hall effect   A process where current is passed through a small portion of semiconductor material and a magnetic field to produce a small voltage in the semiconductor. Hard Fault   A fault currently present in the system. HC 1.   Hydrocarbon. A by-product of combustion and a component of auto exhaust emissions.   2. High Compression. HCDSS   High Clutch Drum Speed Sensor. PCM input from the 4R44E and 4R55E. HFC   High Fan Control HFCF   High Fan Control Fault. Identifies if there is a fault in the HFC circuit. HFP   High Fuel Pump HLOS   Hardware Limited Operating Strategy. A mode of operation where the PCM replaces output commands with fixed values in response to internal PCM malfunctions. HO   High Output HO2S   Heated Oxygen Sensor. Provides information on rich or lean exhaust conditions to the PCM. Hot Soak   Period of time after an engine operates where localized combustion heat dissipates throughout the engine. HTR11, HTR12, HTR13, HO2S   Heater. Heater element for the HO2S sensor. Hydrogen Chemical symbol H. Highly flammable gas. Hz Hertz. Cycles per second.

I

IAC   Idle Air Control. Electrical control of throttle bypass air. IAT   Intake Air Temperature IAT2   Intake Air Temperature 2. Used on supercharged vehicles. IAT2V   Intake Air Temperature 2 Voltage. Actual voltage drop across the IAT2 sensor. IATV   Intake Air Temperature Voltage. Actual voltage drop across the IAT sensor. IC   Integrated Circuit. A small semi-conductor device capable of many separate circuit functions. ICM   Ignition Control Module. The module that controls the ignition system. IFDM   Integrated Fuel Delivery Module IFS   Inertia Fuel Shut Off IGN GND   Ignition Ground IGN_KEY (IGKY)   Ignition Key IGN_SW (IGSW)   Ignition Switch Position Ignition System used to provide high voltage spark for internal combustion engines. ILC   Generator I-Line Control. A generator feedback signal provided to the PCM. IMRC   Intake Manifold Runner Control. Controls or modifies airflow in the intake air system. IMRCM   Intake Manifold Runner Control Monitor. Monitors the IMRC circuits for faults. IMTV, IMTV1, IMTV2   Intake Manifold Tuning Valve. Controls airflow through runners in a split intake manifold. INJ1, INJ2, INJ3, IN   Injector number or its signal output from the PCM. Injector   A device for delivering metered pressurized fuel to the intake system or the cylinders. Intake Air   Air drawn through a filter and distributed to each cylinder for use in combustion. Intercooler   See CAC. IPATS   Integrated Passive Anti-Theft System ISO   International Standards Organization ISS   Intermediate/Input Shaft Speed Sensor

K

KAM   Keep Alive Memory. A portion of the memory within the PCM that must have power even when the vehicle is not operating. KAPWR   Keep Alive Power. A dedicated and unswitched power circuit that maintains KAM. KEYPWR   Key Power. Battery voltage supplied when the ignition switch is in the ON position. Km/h   Kilometers Per Hour Knock   A sharp metallic sound produced when 2 combustion pressure fronts collide in the combustion chamber of an engine. KOEO   Self-Test Key On Engine Off self-test. A test of the EEC system conducted by the PCM with power applied and the engine at rest. KOER   Self-Test Key On Engine Running self-test. A test of the EEC system conducted by the PCM with the engine running and the vehicle at rest. kPa   Kilopascal. Unit of pressure. 3.386 kPa = 1 inch of mercury (Hg). KS   Knock Sensor. Detects engine knock.

L

L Liters. The unit of volume in the metric measuring system. One liter equals 1.06 quarts. LEV   Low Emissions Vehicle LFC   Low Fan Control LONGFT1, LONGFT2   Long-Term Fuel Trim. Fuel flow adjustment determined by the PCM. LOOP   Indicates OPEN or CLOSED loop status. LPG   Liquefied Petroleum Gas LPLR   Low Pressure Low Resistance fuel injector.

M

M/T   Manual Transmission/Transaxle M5OD   Manual 5-Speed transmission with overdrive (RWD). M-85   Fuel containing 85% methanol alcohol. MAF   Mass Air Flow MAF RTN   Mass Air Flow Return. A return circuit for the MAF sensor. MAP   Manifold Absolute Pressure. The internal pressure of the intake manifold. MFC   Medium Fan Control MFI   Multiport Fuel Injection. A fuel-delivery system in which each cylinder is individually fueled. MFP   Modulated Fuel Pump Microprocessor   A device that controls logic and arithmetic functions. MIL   Malfunction Indicator Lamp. An indicator lamp alerting the driver of an emission related malfunction. MISF   Misfire. Any event in the cylinder that causes a sudden change in acceleration of the crankshaft. MON   Motor Octane Number MSOF   Manual Shift-on-the-Fly MY   Model Year

N

NA   Naturally Aspirated. An engine that is not supercharged or turbocharged. NC   Normally Closed NGS   New Generation Self-Test Automatic Readout (STAR) tester. NO   Normally Open NOX   Oxides of Nitrogen. Gasses formed at high combustion temperatures. NPS   Neutral Pressure Switch or its signal input to the PCM.

O

O2S11, O2S12, O2S13, Oxygen Sensor.   Provides information on rich or lean exhaust conditions to the PCM. OASIS   On-line Automotive Service Information System OBD, OBD-II   On-Board Diagnostics, On-Board Diagnostics Second Generation. A system that monitors the PCM input and output control signals. OC   Oxidation Catalytic converter. A catalytic converter system that reduces the levels of HC and CO emissions. OCS   Overdrive Cancel Switch OCT   ADJ Octane Adjust. Compensating strategy that adjusts for changes in fuel octane. OEM   Original Equipment Manufacturer OHC   Overhead Cam. An engine configuration that uses a single camshaft positioned above the valves. OL   Open Loop. An operating condition based on instructions not modified by PCM feedback. On-Demand Test   The KOEO and KOER tests of the PCM initialized by a technician. Open Circuit A circuit which does not provide a complete path for the flow of current. OSC   Output State Control OSS   Output Shaft Speed. Indicates the rotational speed of the transmission output shaft. OTM   Output Test Mode OWL   Overheat Warning Lamp or its signal output from the PCM. Turns the TEMP warning lamp ON when the engine oil temperature exceeds safe limits. Ozone   A blue, gaseous form of oxygen (O3) formed naturally by electric discharge or exposure to ultraviolet radiation.

P

Particulate   Small solid matter found in exhaust gases, especially prevalent in diesel engines. PATS   Passive Anti-Theft System PATSIL   Passive Anti-Theft System Indicator Lamp PATSIN   Passive Anti-Theft System Receive Signal PATSOUT   Passive Anti-Theft System Transmit Signal PATSTRT   Passive Anti-Theft System Starter Relay Control PCM   Powertrain Control Module. Formerly known as the electronic engine control (EEC) processor. PCV   Positive Crankcase Ventilation. A system which allows the controlled flow of crankcase vapors into the combustion chamber. PF   Purge Flow. Amount of fuel vapor burned in the engine. Photochemical   Term describing the action of light on air pollutants which results in creating smog. PID   Parameter Identifier. Identifies an address in the PCM memory which contains operating information. PIP   Profile Ignition Pickup. Provides crankshaft position information for ignition synchronization. PNP   Park/Neutral Position switch. Also known as Neutral Drive Switch (NDS), Neutral Gear Switch (NGS), and Transmission Switch Neutral (TSN). Potentiometer   An adjustable resistance component commonly used as a sensor example Powertrain   Engine and transmission/transaxle components. PPM   Parts per Million. A measure used in emission analysis. Pressure - Absolute   A pressure referenced to a perfect vacuum. Pressure - Atmospheric   The pressure of the surrounding air at any given temperature and altitude. Sometimes called Barometric Pressure. Pressure - Barometric   Pertaining to atmospheric pressure or the results obtained by a barometer. Pressure - Different   The pressure difference between 2 regions, such as between the intake manifold and the atmospheric pressure. Pressure - Gauge   The amount by which the absolute pressure exceeds the atmospheric pressure. PROM   Programmable Read-Only Memory. Similar to ROM, except without program instructions. Protocol   A set of rules for the exchange of information on a network. PSOM   Programmable Speedometer/Odometer Module. A module that processes vehicle speed information. PSP   Power Steering Pressure. Indicates the pressure in the power steering system. PSP V   Power Steering Pressure Input Voltage PSPT   Power Steering Pressure Transducer PTEC   Powertrain Electronic Controller PTO   Power Take-Off PTO LOAD   Power Take-Off Load PTOIL   Power Take-Off Indicator Lamp PW   Pulse Width. The length of time an actuator, such as a fuel injector, remains energized. PWM   Pulse Width Modulation. Controls the intensity of an output by varying the signal duty cycle. PWR GND   Power Ground. The main ground circuit in the EEC system.

Q

Quick Test   A series of diagnostic tests of the EEC system consisting of KOEO, KOER, and Continuous Memory Self-Tests. The results are displayed as a series of DTCs.

R

RABS   Rear Anti-lock Brake System RAM   Random Access Memory. Memory into which information can be written as well as read. RDI   Restraint Deployment Indicator REDOX   Reduction Oxidation Catalytic converter. A catalytic converter system designed to operate at high temperatures. Regulator   Controls the alternator/generator field current to maintain the proper battery charge. Contained within the PCM in smart charging applications. Relay   An electromechanical device in which connections in one circuit are opened or closed by changes in another circuit. REM   Rear Electronic Module Repetitive Spark   Multiple firings of individual spark plugs at engine speeds of less than 1000 RPM to improve idle quality and improve emissions. REVERSE or REV   Transmission Reverse Switch Input RF   Radio Frequency RFI   Radio Frequency Interference RFS   Return Fuel System RLC   Reverse Lamp Control RM   Relay Module. A module containing 2 or more relays. ROM   Read-Only Memory. Computer memory that can be accessed and used, but not altered. RON   Research Octane Number Routine   A group of related tasks, such as a series of diagnostic tests. RPM   Revolutions Per Minute RS   Reverse Switch RTN   Return. A dedicated sensor ground circuit. RWD   Rear Wheel Drive

S

SAE   Society of Automotive Engineers SAIR    Secondary Air SBS   Supercharger Bypass Solenoid or its signal output from the PCM. SC   Supercharged or Supercharger SCBC   Supercharger Bypass Control. A system that allows manifold vacuum to be bled away from the supercharger wastegate actuator to allow for maximum boost. SCBCF   Supercharger Bypass Control Fault. Identifies whether a fault exists in the Supercharger Bypass circuit. SCCS   Speed Control Command Switch SCICP   Supercharger Intercooler Pump Control SCICPF   Supercharger Intercooler Pump Control Fault SCIPC   The PID to monitor the operation of the Supercharger and Charge Air Cooler pump. SCP   Standard Corporate Protocol Self-Test    See Quick Test. Sensor   A device that detects the value or change in a physical quantity, such as temperature, pressure, or flow rate, and converts the data into an electrical signal. SFI   Sequential Multiport Fuel Injection. A multiport fuel delivery system where each injector is individually energized and timed relative to its cylinder intake event. Shield   A conducting sleeve that surrounds wires to be electronically isolated from electromagnetic interference (EMI). Short Circuit   An undesirable condition in a circuit where the circuit termination is at a point other than that intended. SHRT FT   Short-Term Fuel Trim. Fuel flow adjustment in response to the HO2S sensor(s) input during closed-loop operation. SIG RTN   Signal Return. A dedicated sensor ground circuit that is common to 2 or more sensors. SIL   Shift Indicator Lamp SIL   Shift Indicator Lamp. A lamp that indicates the preferred shift points on select manual transmission/transaxle vehicles. Smart Driver   A PCM output driver that can detect faults (open or shorts) on its output circuit. SME   Society of Manufacturing Engineers SMR   Starter Motor Request. An input signal provide to the PCM when the ignition switch is in the START position. SOF   Shift-on-the-Fly SOHC   Single Overhead Cam Solenoid   A device consisting of an electrical coil which produces a magnetic field which changes the position of a metal plunger. SS1/SS2/SS3   Shift solenoids. Devices in an automatic transmission that control the shifting by varying fluid flow when commanded by the PCM. SSA/SSB/SSC/SSD/SSE   Shift solenoids. Devices in an automatic transmission that control the shifting by varying fluid flow when commanded by the PCM. Stoichiometry   An air/fuel mixture that is neither too rich nor too lean. Stoichiometric ratio is 14.7 parts of air for every 1 part of fuel. Switch   A device for making, breaking, or changing the connections in an electrical circuit.

T

TA   Traction Assist TACH   Tachometer TACM, TACMP, TACMN   Throttle Actuator Control Motor +/- used in the ETC system. TB Throttle Body.   A device that controls airflow through the engine via a butterfly valve and has an air bypass channel around the throttle plate. TC 1.   Traction Control. Combines anti-lock braking and axle torque reduction to control wheel slippage.   2. Turbocharger. TCC/TCCH   Torque Converter Clutch. When energized, causes a mechanical engagement and disengagement of the Torque Converter Clutch. TCIL   Transmission Control Indicator Lamp. Indicates that the TCS has been activated. TCS   Transmission Control Switch. Modifies the operation of electronically controlled transmissions. TDC   Top Dead Center Tear Tag   The label attached to the PCM to identify its calibration. TFT   Transmission Fluid Temperature. Indicates the temperature of transmission fluid. Thermistor   A temperature dependent resistor, like that used in CHT and ECT sensors. Timing   The relationship between spark plug firing and piston position expressed in crankshaft degrees before (BTDC) or after (ATDC) top dead center of the compression stroke. Torque converter   A device which by its design multiplies the torque in a fluid coupling between an engine and transmission/transaxle. TP   Throttle Position sensor. A potentiometer that provides throttle angle and rate information for the PCM. TP V   Throttle Position sensor Voltage TP1   Throttle Position 1 TP2   Throttle Position 2 TR Sensor   Provides information to the PCM on the transmission range selector position. TR V   Transmission Range Voltage TR, TR1, TR2, TR3, T   Transmission Range. The range in which the transmission is operating. Transaxle   A device consisting of a transmission and axle drive gears assembled in the same case. Front-wheel drive and some all-wheel applications. Transducer   A device that receives energy from one medium and transfers it to another. For example, thermal energy is converted to an electrical signal through a temperature probe. Transmission   A device which selectively increases or decreases the ratio of relative rotation between its input and output shafts. Rear-wheel drive applications. Transmissions Transmissions/Transa TRO-N   Transmission Range Output Neutral TRO-P   Transmission Range Output Park TS1   Transmission Range Sensor - 1st TSB   Technical Service Bulletin. Notifies technician of any known vehicle concerns, procedures, or general repair information. TSD   Transmission Range Sensor - Drive TSR   Transmission Range Sensor - Reverse TSS   Turbine Shaft Speed. Indicates the rotational speed of the transmission turbine shaft.

U

Underspeed Mode   A control mode that prevents the engine from stalling in the event it stumbles while running. Also used during engine crank.

V

Vacuum   Manifold pressure that is reduced below the ambient atmospheric pressure. Variable Reluctance   A process of passing a varying magnetic field through wire windings and inducing a voltage. VBPWR   Vehicle Buffered Power. A PCM supplied power source that supplies regulated voltage. VCT, VCT1, VCT2   Variable Camshaft Timing VDF   Visctronic Drive Fan VECI   Vehicle Emission Control Information label VIN Vehicle Identification Number.   A unique identification number given to every vehicle produced. Includes information about the year, model, engine, and plant origin of the vehicle. VMV   Vapor Management Valve. Also known as EVAPCP. Refer to EVAPCP. VPWR   Vehicle Power. A switched circuit that provides power to the EEC system. Compare to battery voltage (B+). VREF   Reference Voltage. A dedicated circuit that provides an approximately 5.0 volt signal used as a reference by certain sensors. VSOUT   Vehicle Speed Output. A pulse width modulated vehicle speed signal. VSS   Vehicle Speed Sensor. A magnetic pickup device that generates an AC signal that is proportional to the vehicle speed.

W

WAC   Wide Open Throttle A/C Cut-Off. Turns the A/C system off during wide open throttle or certain other operating conditions. Wastegate Control   A device that opens the wastegate in case of overboost from a turbocharger. WOT   Wide Open Throttle. A condition of maximum airflow through the throttle body.

Z

Zip Tube   Another name for fresh air duct or air inlet duct.