LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2008 >> Edge Limited, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Introduction (Except Diesel & Hybrid) >> Acronyms and Definitions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Acronyms and Definitions

NOTE: This acronyms and definitions listing contains technical terms applicable to Ford Motor Company products. It is not intended to be an all-inclusive dictionary of components and their functions. If a detailed description of a particular system or component is desired, refer to the applicable part within this PC/ED article or refer to the Workshop Manual for additional information regarding the specific vehicle being repaired.
  1. 2V: Two valves per engine cylinder
  2. 3V: Three valves per engine cylinder
  3. 4V: Four valves per engine cylinder
  4. 4WD: Four Wheel Drive
  5. ABS: Antilock Braking System
  6. A/C: Air Conditioning
  7. A/CC: Air Conditioning Clutch
  8. A/CCR: Air Conditioning Clutch Control Relay
  9. ACCS: Air Conditioning Cycling Switch
  10. ACET: Air Conditioning Evaporator Temperature
  11. ACP: Air Conditioning Pressure
  12. ACPSW: Air Conditioning Pressure Switch
  13. A/D: Analog-to-Digital. Analog-to-Digital signal conversion.
  14. APP: Accelerator Pedal Position
  15. BARO: Barometric Pressure
  16. BJB: Battery Junction Box
  17. BPP: Brake Pedal Position
  18. BPS: Brake Pedal Switch
  19. BTDC: Before Top Dead Center
  20. CAC: Charge Air Cooler. A device which lowers the temperature of pressurized intake air.
  21. CAN: Controller Area Network
  22. CCM: Comprehensive Component Monitor
  23. CF: Cooling Fan
  24. CHT: Cylinder Head Temperature
  25. CKP: Crankshaft Position
  26. CL: Closed Loop. An operating condition or mode which enables operation based on sensor feedback.
  27. CMCV: Charge Motion Control Valve
  28. CMP: Camshaft Position
  29. CO: Carbon Monoxide. A colorless, odorless, and toxic gas that is a component of auto exhaust emissions.
  30. CO2 : Carbon Dioxide. A colorless, odorless gas that is a normal by-product of the combustion of fuel.
  31. COP: Coil On Plug. Ignition coil on plug assembly.
  32. CPP: Clutch Pedal Position
  33. CPU: Central Processing Unit
  34. CTO: Clean Tach Output. Signal used to drive the instrument panel tachometer.
  35. CV: Canister Vent Solenoid. A solenoid which seals the evaporative emission (EVAP) system from the atmosphere during the EVAP monitor test.
  36. CVT: Continuously Variable Transmission
  37. DBA: Driver Brake Application
  38. 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.
  39. DEPS: Dual Equal Phase Shifting
  40. DIPS: Dual Independent Phase Shifting
  41. DLC: Data Link Connector. SAE standard J1962 connector providing access to vehicle diagnostic information.
  42. DMM: Digital Multimeter
  43. DRI: Deposit Resistant Injector
  44. DTM: Diagnostic Test Mode. A level of capability in an OBD system.
  45. DTC: Diagnostic Trouble Code. An alpha/numeric identifier for a concern identified by the OBD system.
  46. E10: Fuel containing 10% ethanol
  47. E85: Fuel containing 85% ethanol
  48. EATC: Electronic Automatic Temperature Control
  49. ECM: Electronic Control Module
  50. ECT: Engine Coolant Temperature
  51. EEC: Electronic Engine Control
  52. EEGR: Electric Exhaust Gas Recirculation
  53. EEPROM: Electrically Erasable Programmable Read-Only Memory
  54. EGR: Exhaust Gas Recirculation
  55. EI: Electronic Ignition
  56. EMD: Engine Manufacturers Diagnostics
  57. EMI: Electromagnetic Interference. Usually caused by ignition voltage spikes, solenoids, relay operation, or noisy generator contacts.
  58. EONV: Engine Off Natural Vacuum
  59. EOT: Engine Oil Temperature
  60. EPS: Exhaust Phase Shifting
  61. E-Quizzer: Enhanced Quizzer
  62. ERFS: Electronic Returnless Fuel System
  63. ESM: EGR System Module
  64. ESOF: Electronic Shift-on-the-Fly
  65. ETB: Electronic Throttle Body
  66. ETBTACM: Electronic Throttle Body Throttle Actuator Control Motor
  67. ETBTPS: Electronic Throttle Body Throttle Position Sensor
  68. ETC: Electronic Throttle Control
  69. ETCREF: Electronic Throttle Control Reference Voltage
  70. ETCRTN: Electronic Throttle Control Return
  71. EVAPCP: Evaporative Canister Purge Valve. A valve which controls the venting of fuel vapor from the evaporative emissions canister into the intake manifold for combustion.
  72. FAOS: Fore-Aft Oxygen Sensor
  73. FC: Fan Control
  74. FCIL: Fuel Cap Indicator Lamp. Indicates that the fuel filler cap is not correctly installed.
  75. FEPS: Flash EEPROM Programming Signal. An 18-volt DC signal input from the scan tool used by the PCM to initiate programming.
  76. FFV: Flexible Fuel Vehicle
  77. 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.
  78. FMEM: Failure Mode Effects Management. Operating strategy that maintains limited vehicle function in the event of a PCM or EEC component failure.
  79. FP: Fuel Pump
  80. FPC: Fuel Pump Control
  81. FPDM: Fuel Pump Driver Module. A module that controls the electric fuel pump.
  82. FPM: Fuel Pump Monitor
  83. FRP: Fuel Rail Pressure
  84. FRPT: Fuel Rail Pressure Temperature
  85. FSS: Fan Speed Sensor
  86. FTP: Fuel Tank Pressure
  87. FWD: Front Wheel Drive
  88. GND: Ground
  89. GPM: 1. Grams per Mile. 2. Gallons per Minute.
  90. H: Hydrogen
  91. HC: 1. Hydrocarbon. A by-product of combustion and a component of auto exhaust emissions. 2. High Compression.
  92. HDR: High Data Rate
  93. HLOS: Hardware Limited Operating Strategy. A mode of operation where the PCM uses fixed values in response to internal PCM concerns in place of output commands.
  94. HO2S: Heated Oxygen Sensor. Provides information on rich or lean exhaust conditions to the PCM.
  95. Hz: Hertz. Cycles per second.
  96. IAC: Idle Air Control. Electrical control of throttle bypass air.
  97. IAT: Intake Air Temperature
  98. IAT2: Intake Air Temperature 2. Used on supercharged vehicles.
  99. IDM: Ignition Diagnostic Monitor
  100. IFS: Inertia Fuel Shut-Off
  101. I/M: Inspection/Maintenance
  102. IMRC: Intake Manifold Runner Control. Controls or modifies airflow in the intake air system.
  103. IMRCM: Intake Manifold Runner Control Monitor. Monitors the IMRC circuits for concerns.
  104. IMTV: Intake Manifold Tuning Valve. Controls airflow through runners in a split intake manifold.
  105. INJ: Injector
  106. IPC: Independent Plausibility Checker
  107. IPS: Intake Phase Shifting
  108. ISO: International Standards Organization
  109. KAM: Keep Alive Memory. A portion of the memory within the PCM that must have power even when the vehicle is not operating.
  110. KAPWR: Keep Alive Power. A dedicated and unswitched power circuit that maintains KAM.
  111. 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.
  112. 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.
  113. Km/h: Kilometers per Hour
  114. kPa: Kilopascals. Unit of pressure. 3.386 kPa equals 1 (in-Hg).
  115. KS: Knock Sensor
  116. L: Liters. The unit of volume in the metric measuring system. One liter equals 1.06 quarts.
  117. LDR: Low Data Rate
  118. LONGFT: Long-Term Fuel Trim. Fuel flow adjustment determined by the PCM.
  119. LOS: Limited Operating Strategy
  120. MAF: Mass Air Flow
  121. MAP: Manifold Absolute Pressure. The internal pressure of the intake manifold.
  122. MFF: Misfire Freeze Frame
  123. MIL: Malfunction Indicator Lamp. An indicator lamp alerting the driver of an emission related concern.
  124. MRFS: Mechanical Returnless Fuel System
  125. MSOF: Manual Shift-on-the-Fly
  126. N: Nitrogen
  127. NMOG: Non-Methane Organic Gases
  128. NOX : Oxides of Nitrogen. Gasses formed at high combustion temperatures.
  129. OASIS: On-line Automotive Service Information System
  130. OHC: Overhead Cam. An engine configuration that uses a single camshaft positioned above the valves.
  131. OL: Open Loop. An operating condition based on instructions not modified by PCM feedback.
  132. OSC: Output State Control
  133. OSR: On-Board System Readiness
  134. OTM: Output Test Mode
  135. PATS: Passive Anti-Theft System
  136. PCM: Powertrain Control Module
  137. PCM-VSO: Powertrain Control Module - Vehicle Speed Output
  138. PCV: Positive Crankcase Ventilation
  139. PCVTE: Positive Crankcase Ventilation Thermal Extension
  140. Pd: Palladium
  141. PDJB: Power Distribution Junction Box
  142. PID: Parameter Identification. Identifies an address in the PCM memory which contains operating information.
  143. PIP: Profile Ignition Pickup. Provides crankshaft position information for ignition synchronization.
  144. PPM: Parts per Million. A measure used in emission analysis.
  145. PS: Pressure Switch
  146. PSP: Power Steering Pressure. Indicates the pressure in the power steering system.
  147. PSPT: Power Steering Pressure Transducer
  148. Pt: Platinum
  149. PTO: Power Take-Off
  150. PTS: Professional Technician Society
  151. PWM: Pulse Width Modulation. Controls the intensity of an output by varying the signal duty cycle.
  152. PWR GND: Power Ground. The main ground circuit in the EEC system.
  153. RAM: Random Access Memory. Memory into which information can be written as well as read.
  154. RFI: Radio Frequency Interference
  155. Rh: Rhodium
  156. ROM: Read-Only Memory. Computer memory that can be accessed and used, but not altered.
  157. RPM: Revolutions Per Minute
  158. RWD: Rear Wheel Drive
  159. SAE: Society of Automotive Engineers
  160. SCB: Supercharger Bypass
  161. SFI: Sequential Multiport Fuel Injection. A multiport fuel delivery system in which each injector is individually energized and timed relative to its cylinder intake event.
  162. SHRTFT: Short-Term Fuel Trim. Fuel flow adjustment in response to the HO2S sensor(s) input during closed-loop operation.
  163. SIG RTN: Signal Return. A dedicated sensor ground circuit that is common to 2 or more sensors.
  164. SJB: Smart Junction Box
  165. SMR: Starter Motor Request
  166. TAC: Throttle Actuator Control
  167. TACM: Throttle Actuator Control Motor
  168. TCM: Transmission Control Module
  169. TCSS: Transfer Case Speed Sensor
  170. TDC: Top Dead Center
  171. TP: Throttle Position
  172. TPPC: Throttle Plate Position Controller
  173. TSB: Technical Service Bulletin. Notifies technician of any known vehicle concerns, procedures, or general repair information.
  174. TWC: Three-Way Catalytic
  175. VBPWR: Vehicle Buffered Power. A PCM-supplied power source that supplies regulated voltage.
  176. VCM: Vehicle Communication Module
  177. VCT: Variable Camshaft Timing
  178. VECI: Vehicle Emission Control Information
  179. VID: Vehicle Identification
  180. 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.
  181. VMV: Vapor Management Valve
  182. VPWR: Vehicle Power. A switched circuit that provides power to the EEC system. Compare to battery voltage (B+).
  183. VR: Variable Reluctance
  184. VREF: Reference Voltage. A dedicated circuit that provides an approximately 5.0 volt signal used as a reference by certain sensors.
  185. WAC: Wide Open Throttle Air Conditioning Cutoff
  186. WOT: Wide Open Throttle. A condition of maximum airflow through the throttle body.
  187. Transmissions:
    NOTE: The automatic transmission naming convention is as follows:
    • The first character, a number, is the number of forward gears.
    • The second character, either the letter F or R, represents front (transaxle) or rear (transmission) wheel drive.
    • The next set of characters, a grouping of numbers, represents the design torque capacity of the transmission/transaxle.
    • The last character, if used, is one of the following:
      • E for electronic shift
      • N for non-synchronous shift
      • S for synchronous shift
      • W for wide ratio

      • As an example, for the 4F27E transaxle, the number of forward gears is 4, the character F indicates front transaxle, 27 represents 270 ft-lbs of torque capacity and the character E represents an electronic shift.

  188. A/T: Automatic Transmission
  189. CCS: Coast Clutch Solenoid
  190. EPC: Electronic Pressure Control
  191. ESS: Electronic Shift Scheduling
  192. ISS: Intermediate/Input Shaft Speed Sensor
  193. M/T: Manual Transmission/Transaxle
  194. OCS: Overdrive Cancel Switch
  195. OSS: Output Shaft Speed. Indicates the rotational speed of the transmission output shaft.
  196. PNP: Park/Neutral Position switch.
  197. REVERSE or REV: Transmission Reverse Switch Input
  198. 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.
  199. SS1/SS2/SS3: Shift solenoids. Devices in an automatic transmission that control the shifting by varying fluid flow when commanded by the PCM.
  200. TCC: Torque Converter Clutch. When energized, causes a mechanical engagement and disengagement of the torque converter clutch.
  201. TCIL: Transmission Control Indicator Lamp. Indicates that the TCS has been activated.
  202. TCS: Transmission Control Switch. Modifies the operation of electronically controlled transmissions.
  203. TFT: Transmission Fluid Temperature. Indicates the temperature of transmission fluid.
  204. TR: Transmission Range. The range in which the transmission is operating.
  205. TSS: Turbine Shaft Speed. Indicates the rotational speed of the transmission turbine shaft.
  206. VSS: Vehicle Speed Sensor. A magnetic pickup device that generates an AC signal that is proportional to the vehicle speed.
  207. VSOUT: Vehicle Speed Output. A pulse width modulated vehicle speed signal.
scientia non olet · About LEMON Manuals