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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 consult the Workshop article for the specific vehicle being repaired.
  1. 4V: Four valves per engine cylinder
  2. ABS: Anti-Lock Brake System
  3. A/C: Air Conditioning
  4. A/CC: Air Conditioning Clutch
  5. A/CCR: A/C Clutch Control Relay
  6. A/CLPCS: A/C Low Pressure Cycling Switch
  7. ACCS: Air Conditioning Cycling Switch
  8. ACET: Air Conditioning Evaporator Temperature
  9. ACP: Air Conditioning Head Pressure or A/C cycling switch input state
  10. ACPSW: Air Conditioning Pressure Switch
  11. ACRDV: Air Conditioning (A/C) Refrigerant Distribution Valve
  12. A/D: Analog-to-Digital. Analog-to-Digital signal conversion.
  13. Air/Fuel Ratio: Air-to-fuel mixture ratio. An air-to-fuel mixture that is 14.7:1 is also called stoichiometric.
  14. Ambient Air Temperature: Temperature of the air surrounding an object
  15. Analog (Electrical/Electronic): An electrical signal that can obtain any value within the voltage limits of the signal.
  16. APP: Accelerator Pedal Position
  17. ARB: Air Resource Board
  18. ASCII: American Standard Code Information Interchange
  19. ATDC: After Top Dead Center
  20. BARO: Barometric Pressure
  21. Base Timing: Spark advance in degrees before top dead center of the base engine without any control from the PCM.
  22. Battery Positive Voltage (B+): The positive (+) voltage from the battery or any circuit connected directly to the battery.
  23. BATTEMP: Battery Temperature
  24. BJB: Battery Junction Box
  25. BPA: Brake Pedal Applied. Typically located on the braking system master cylinder. Can be hydraulic or electric.
  26. BPO: Battery Power Off
  27. BPP: Brake Pedal Position
  28. BPS: Brake Pedal Switch/Speed Control Deactivation
  29. BTDC: Before Top Dead Center
  30. BVREF: Buffer Voltage Reference. A dedicated circuit that provides an approximately 5-volt signal used as a reference by certain sensors.
  31. CAFE: Corporate Average Fuel Economy. A set of federal requirements and regulations that govern fuel economy standards.
  32. CANVNT: Canister Vent
  33. CAN: Controller Area Network
  34. CCM: Comprehensive Component Monitor
  35. CD A through D: Coil Driver 1 through 4
  36. Centralized Testing Facility: State government operation. Provides inspection/maintenance (IM) and safety inspections.
  37. CGND: Case Ground. Provides a ground source for the PCM or ECU case.
  38. CHT: Cylinder Head Temperature. Units are displayed in degrees Fahrenheit or degrees Celsius.
  39. CHTV: Cylinder Head Temperature Voltage
  40. CKP: Crankshaft Position
  41. CL: Closed Loop. An operating condition or mode that enables operation based on sensor feedback.
  42. CMP: Camshaft Position. PCM input signal from the camshaft position sensor.
  43. CMS: Catalyst Monitor Sensor. The downstream heated oxygen sensor (HO2S).
  44. CMVSS: Canadian Motor Vehicle Safety Standards
  45. CO: Carbon Monoxide. A colorless, odorless and toxic gas that is a component of auto exhaust emissions.
  46. CO2 : Carbon Dioxide. A colorless, odorless gas that is a normal by-product of the combustion of fuel.
  47. 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 stabilizes.
  48. CONT: Continuous Memory. The portion of keep alive memory (KAM) used to store DTCs generated during the continuous memory self-test.
  49. COP: Coil On Plug
  50. CSE GND: Case Ground
  51. 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.
  52. CTO: Clean Tach Output
  53. DATC: Dual Automatic Temperature Control
  54. DC: 1. Direct Current. Electric current flowing in 1 direction. 2. Duty Cycle. The voltage measurement of ON time versus the full cycle period, expressed in percent.
  55. DCL: Data Communication Link. A communication path between various in-vehicle electronic modules. Accessed by scan tools through the data link connector (DLC).
  56. Digital: Controls process information by switching the current or voltage ON and OFF.
  57. DLC: Data Link Connector. J1962 connector providing access to vehicle diagnostic information.
  58. DMM: Digital Multimeter
  59. DOHC: Dual Overhead Cam. An engine configuration that uses 2 camshafts positioned above the valves.
  60. DTM: Diagnostic Test Mode. A level of capability in an on board diagnostics (OBD) system.
  61. DTC: Diagnostic Trouble Code. An alpha/numeric identifier for a concern identified by the OBD system.
  62. ECT: Engine Coolant Temperature. Displayed in degrees Fahrenheit or degrees Celsius.
  63. ECVT: Electronically Controlled Continuously Variable Transaxle
  64. EEC: Electronic Engine Control
  65. EEGR: Electric Exhaust Gas Recirculation
  66. EEPROM: Electrically Erasable Programmable Read-Only Memory. An electronic component in the PCM that allows the electronic storage of information.
  67. EGR: Exhaust Gas Recirculation. A process in which a small amount of exhaust gas is routed into the combustion chamber.
  68. EI: Integrated Electronic Ignition. An electronic ignition system that has the ignition control module (ICM) integrated into the PCM.
  69. EI-LDR: Electronic Ignition-Low Data Rate
  70. EMI: Electromagnetic Interference. Usually caused by ignition voltage spikes, solenoids, relay operation, or noisy generator contacts.
  71. EOT: Engine Oil Temperature
  72. EPA: Environmental Protection Agency
  73. ESM: EGR System Module
  74. ETC: Electronic Throttle Control
  75. ETCVREF: Voltage Reference
  76. EVAP: Evaporative Emissions. A system to prevent fuel vapor from escaping into the atmosphere.
  77. Evaporative Emissions Canister: An evaporative emission canister containing activated charcoal that absorbs and holds fuel vapors.
  78. EVO: Electronic Variable Orifice
  79. EVMV: Electric Vapor Management Valve. Also known as the EVAP canister purge valve.
  80. Exciter Ring: A toothed or notched iron or steel disk that is the moveable part of a speed sensor.
  81. FAN: Fan Speed
  82. FC: Fan Control
  83. FCS: Fuel Control Solenoid
  84. FCIL: Fuel Cap Indicator Lamp. Indicates the fuel filler cap is not correctly installed.
  85. FEAD: Front End Accessory Drive
  86. FEPS: Flash EEPROM Programming Signal. 18-volt DC signal sent by the scan tool to initiate PCM reprogramming.
  87. FLI: Fuel Level Input. Used by the EVAP monitor to calculate fuel tank vapor volume. Displayed as a percentage.
  88. FMEM: Failure Mode Effects Management. Operating strategy that maintains limited vehicle function in the event of a PCM or EEC component failure.
  89. FP: Fuel Pump
  90. FPDM: Fuel Pump Driver Module. A module that controls the electric fuel pump.
  91. FRPT: Fuel Rail Pressure Temperature Sensor
  92. FTIV: Fuel Tank Isolation Valve
  93. FTP: Fuel Tank Pressure
  94. FWD: Front-Wheel Drive
  95. GCU: Generator Control Unit
  96. GND: Ground
  97. GPM: Grams per Mile. Also known as Gallons per Minute.
  98. GSDN: Generator Motor Shutdown
  99. GVW: Gross Vehicle Weight
  100. 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.
  101. HC: Hydrocarbon
  102. HO2S: Heated Oxygen Sensor
  103. HVIL: High Voltage Interlock Circuit
  104. HVIN: High Voltage Interlock Negative Circuit
  105. HVIP: High Voltage Interlock Positive Circuit
  106. HVN: High Voltage Negative Circuit
  107. HVP: High Voltage Positive Circuit
  108. Hz: Hertz
  109. IAT: Intake Air Temperature
  110. IFS: Inertia Fuel Shut-Off
  111. IGN GND: Ignition Ground
  112. IMAP: Inferred Manifold Absolute Pressure (MAP)
  113. IPC: Independent Plausibility Checker
  114. ISDN1, ISDN2: Immediate Shutdown Circuits 1 and 2
  115. ISP-R: Ignition Switch Position RUN Circuit
  116. ISP-R/S: Ignition Switch Position START Circuit
  117. ISO: International Standards Organization
  118. ITCC: Intelligent Torque-Controlled Coupling
  119. KAM: Keep Alive Memory
  120. KAPWR: Keep Alive Power
  121. KEYPWR: Key Power
  122. KOEO Self-Test: Key On Engine Off self-test
  123. KOER Self-Test: Key On Engine Running self-test
  124. Km/h: Kilometers per Hour
  125. kPa: Kilopascals. Unit of pressure. 3.386 kPa equals 1 inch of mercury (Hg).
  126. LDR: Low Data Rate
  127. LOAD: Calculated Engine Load
  128. LONGFT1: Long-Term Fuel Trim Bank 1
  129. MAF: Mass Air Flow
  130. MAF RTN: Mass Air Flow Return. A return circuit for the MAF sensor.
  131. MAP: Manifold Absolute Pressure. The internal pressure of the intake manifold.
  132. MCLTEMP: Traction Motor Coil Temperature
  133. MCU: Motor Control Unit
  134. MECP: Motor Electronics Coolant Pump
  135. MECT: Motor Electronics Coolant Temperature
  136. MIL: Malfunction Indicator Lamp
  137. MSDN: Motor Shutdown
  138. NOX : Oxides of Nitrogen
  139. O2S: Oxygen Sensor
  140. OASIS: On-line Automotive Service Information System
  141. OBD: On Board Diagnostics
  142. OC: Oxidation Catalytic converter
  143. OHC: Overhead Cam
  144. OSC: Output State Control
  145. OTM: Output Test Mode
  146. PCM: Powertrain Control Module
  147. PCV: Positive Crankcase Ventilation
  148. PID: Parameter Identification
  149. PIP: Profile Ignition Pickup
  150. PPM: Parts per Million
  151. PROM: Programmable Read-Only Memory
  152. PSC Module: Power Steering Control Module
  153. PSR: Power Sustain Relay
  154. PWM: Pulse Width Modulation
  155. PWR GND: Power Ground
  156. PZEV: Partial Zero Emission Vehicle
  157. RAM: Random Access Memory
  158. RFI: Radio Frequency Interference
  159. ROM: Read-Only Memory
  160. RPM: Revolutions per Minute
  161. RTN: Return
  162. RWD: Rear-Wheel Drive
  163. SAE: Society of Automotive Engineers
  164. SFI: Sequential Multiport Fuel Injection
  165. SHRTFT1: Short-Term Fuel Trim Bank 1
  166. SIG RTN: Signal Return
  167. 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.
  168. TACM: Throttle Actuator Control Motor
  169. TB: Throttle Body
  170. TBCM: Traction Battery Control Module
  171. TCM: Transaxle Control Module
  172. TDC: Top Dead Center
  173. TFT: Transmission Fluid Temperature
  174. TGAC: Torque of Generator AC signal
  175. TMAC: Torque of Motor AC signal
  176. TP: Throttle Position
  177. TR Sensor: Transmission Range Sensor
  178. VBPWR: Vehicle Buffered Power
  179. VECI: Vehicle Emission Control Information
  180. VIN: Vehicle Identification Number
  181. VMV: Vapor Management Valve
  182. VPWR: Vehicle Power
  183. VREF: Reference Voltage
  184. VSC: Vehicle System Controller
  185. VSS: Vehicle Speed Sensor
  186. WAC: Wide Open Throttle A/C Cut-Off
  187. WOT: Wide Open Throttle
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