Powertrain Management: Application and ID
ACRONYMS AND DEFINITIONSNOTE: 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 Computers and Control Systems or refer to the applicable Vehicle System for the specific vehicle being repaired.
2V: Two valves per engine cylinder
3V: Three valves per engine cylinder
4V: Four valves per engine cylinder
4WD: Four Wheel Drive
ABS: Anti-lock Brake System
A/C: Air Conditioning
A/CC: Air Conditioning Clutch
A/CCR: Air Conditioning Clutch Control Relay
ACCS: Air Conditioning Cycling Switch
ACDS: Air Conditioning Diagnostic Switch (refrigerant containment switch)
ACET: Air Conditioning Evaporator Temperature
ACP: Air Conditioning Pressure
ACPSW: Air Conditioning Pressure Switch
A/D: Analog-to-Digital. Analog-to-Digital signal conversion.
AIR: Secondary Air Injection
APP: Accelerator Pedal Position
BARO: Barometric Pressure
BJB: Battery Junction Box
BPP: Brake Pedal Position
BPS: Brake Pedal Switch
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.
CAC: Charge Air Cooler. A device which lowers the temperature of pressurized intake air.
CAN: Controller Area Network
CCM: Comprehensive Component Monitor
CF: Cooling Fan
CHT: Cylinder Head Temperature
CKP: Crankshaft Position
CL: Closed Loop. An operating condition or mode which enables operation based on sensor feedback.
CMCV: Charge Motion Control Valve
CMP: Camshaft Position
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.
COP: Coil On Plug. Ignition coil on plug assembly.
CPP: Clutch Pedal Position
CPR: Cardiopulmonary Resuscitation
CPU: Central Processing Unit
CTO: Clean Tach Output. Signal used to drive the instrument panel tachometer.
CV: Canister Vent Solenoid. A Solenoid which seals the evaporative emission (EVAP) system from the atmosphere during the EVAP monitor test.
CVT: Continuously Variable Transmission
DBA: Driver Brake Application
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.
DEPS: Dual Equal Phase Shifting
DIPS: Dual Independent Phase Shifting
DLC: Data Link Connector. SAE standard J1962 connector providing access to vehicle diagnostic information.
DMM: Digital Multimeter
DRI: Deposit Resistant Injector
DTM: Diagnostic Test Mode. A level of capability in an OBD system.
DTC: Diagnostic Trouble Code. An alpha/numeric identifier for a concern identified by the OBD system.
E10: Fuel containing 10% ethanol
E85: Fuel containing 85% ethanol
EATC: Electronic Automatic Temperature Control
ECM: Electronic Control Module
ECT: Engine Coolant Temperature
EEC: Electronic Engine Control
EEGR: Electric Exhaust Gas Recirculation System
EEPROM: Electrically Erasable Programmable Read-Only Memory. An electronic component in the PCM that allows the electronic storage of information.
EGR: Exhaust Gas Recirculation. A process in which a small amount of exhaust gas is routed into the combustion chamber.
EI: Electronic Ignition. An electronic ignition system that has the ignition control module integrated into the PCM.
EMD: Engine Manufacturers Diagnostics
EMI: Electromagnetic Interference. Usually caused by ignition voltage spikes, solenoids, relay operation, or noisy generator contacts.
EONV: Engine Off Natural Vacuum
EOT: Engine Oil Temperature
EPS: Exhaust Phase Shifting
E-Quizzer: Enhanced Quizzer
ERFS: Electronic Returnless Fuel System
ESM: EGR System Module
ESOF: Electronic Shift-on-the-Fly
ETB: Electronic Throttle Body
ETBTACM: Electronic Throttle Body Throttle Actuator Control Motor
ETBTPS: Electronic Throttle Body Throttle Position Sensor
ETC: Electronic Throttle Control
ETCREF: Electronic Throttle Control Reference Voltage. 5V for ETC (APP VREF, TP VREF).
ETCRTN: Electronic Throttle Control Return
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.
FAOS: Fore-Aft Oxygen Sensor
FC: Fan Control
FCIL: Fuel Cap Indicator Lamp. Indicates that the fuel filler cap is not correctly installed.
FEPS: Flash EEPROM Programming Signal. An 18-volt DC signal input from the scan tool used by the PCM to initiate programming.
FFV: Flexible Fuel Vehicle
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.
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.
FPM: Fuel Pump Monitor
FRP: Fuel Rail Pressure
FRPT: Fuel Rail Pressure Temperature
FSS: Fan Speed Sensor
FTP: Fuel Tank Pressure
FWD: Front Wheel Drive
GND: Ground
GPM: 1. Grams per Mile. 2. Gallons per Minute.
H: Hydrogen
HC: 1. Hydrocarbon. A by-product of combustion and a component of auto exhaust emissions. 2. High Compression.
HDR: High Data Rate
HFC: High Fan Control
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.
HO2S: Heated Oxygen Sensor. Provides information on rich or lean exhaust conditions to the PCM.
Hz: Hertz. Cycles per second.
IAC: Idle Air Control. Electrical control of throttle bypass air.
IAT: Intake Air Temperature
IAT2: Intake Air Temperature 2. Used on supercharged vehicles.
IC: Integrated Circuit. A small semi-conductor device capable of many separate circuit functions.
IDM: Ignition Diagnostic Monitor
IFS: Inertia Fuel Shut-Off
I/M: Inspection/Maintenance
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 concerns.
IMTV: Intake Manifold Tuning Valve. Controls airflow through runners in a split intake manifold.
INJ: Injector
IPC: Independent Plausibility Checker
IPS: Intake Phase Shifting
ISO: International Standards Organization
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.
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.
Km/h: Kilometers per Hour
kPa: Kilopascal. Unit of pressure. 3.386 kPa equals 1 (in-Hg).
KS: Knock Sensor
L: Liters. The unit of volume in the metric measuring system. One liter equals 1.06 quarts.
LCM: Lighting Control Module
LDR: Low Data Rate
LFC: Low Fan Control
LONGFT: Long-Term Fuel Trim. Fuel flow adjustment determined by the PCM.
LOS: Limited Operating Strategy
LSRC: Long Short Runner Control
MAF: Mass Air Flow
MAP: Manifold Absolute Pressure. The internal pressure of the intake manifold.
MFC: Medium Fan Control
MFF: Misfire Freeze Frame
MIL: Malfunction Indicator Lamp. An indicator lamp alerting the driver of an emission related concern.
MRFS: Mechanical Returnless Fuel System
MSOF: Manual Shift-on-the-Fly
N: Nitrogen
NMOG: Non-Methane Organic Gases
NOx: Oxides of Nitrogen. Gasses formed at high combustion temperatures.
OASIS: On-line Automotive Service Information System
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.
OSC: Output State Control
OSR: On-Board System Readiness
OTM: Output Test Mode
PATS: Passive Anti-Theft System
PCM: Powertrain Control Module. Formerly known as the electronic engine control (EEC) processor.
PCM-VSO: Powertrain Control Module - Vehicle Speed Output
PCV: Positive Crankcase Ventilation. A system which allows the controlled flow of crankcase vapors into the combustion chamber.
PCVTE: Positive Crankcase Ventilation Thermal Extension
Pd: Palladium
PDJB: Power Distribution Junction Box
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.
PPM: Parts per Million. A measure used in emission analysis.
PS: Pressure Switch
PSP: Power Steering Pressure. Indicates the pressure in the power steering system.
PSPT: Power Steering Pressure Transducer
Pt: Platinum
PTO: Power Take-Off
PTS: Professional Technician Society
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.
RAM: Random Access Memory. Memory into which information can be written as well as read.
RFI: Radio Frequency Interference
Rh: Rhodium
ROM: Read-Only Memory. Computer memory that can be accessed and used, but not altered.
RPM: Revolutions Per Minute
RWD: Rear Wheel Drive
SAE: Society of Automotive Engineers
SCB: Supercharger Bypass
SF1: Sequential Multiport Fuel Injection. A multiport fuel delivery system in which each injector is individually energized and timed relative to its cylinder intake event.
SHRTFT: 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.
SJB: Smart Junction Box
SMR: Starter Motor Request
TAC: Throttle Actuator Control
TACM: Throttle Actuator Control Motor
TCM: Transmission Control Module
TCSS: Transfer Case Speed Sensor
TDC: Top Dead Center
TP: Throttle Position
TPPC: Throttle Plate Position Controller
TSB: Technical Service Bulletin. Notifies technician of any known vehicle concerns, procedures, or general repair information.
TWC: Three-Way Catalytic
VBPWR: Vehicle Buffered Power. A PCM-supplied power source that supplies regulated voltage.
VCM: Vehicle Communication Module
VCT: Variable Camshaft Timing
VECI: Vehicle Emission Control Information
VID: Vehicle Identification
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+).
VR: Variable Reluctance
VREF: Reference Voltage. A dedicated circuit that provides an approximately 5.0 volt signal used as a reference by certain sensors.
WAC: Wide Open Throttle Air Conditioning Cutoff
WDS: Worldwide Diagnostic System
WOT: Wide Open Throttle. A condition of maximum airflow through the throttle body.
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.
- A/T: Automatic Transmission
- CCS: Coast Clutch Solenoid
- EPC: Electronic Pressure Control
- ESS: Electronic Shift Scheduling
- ISS: Intermediate/Input Shaft Speed Sensor
- M/T: Manual Transmission/Transaxle
- OCS: Overdrive Cancel Switch
- OSS: Output Shaft Speed. Indicates the rotational speed of the transmission output shaft.
- PNP: Park/Neutral Position switch.
- REVERSE or REV: Transmission Reverse Switch Input
- 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.
- SS1/SS2/SS3: Shift solenoids. Devices in an automatic transmission that control the shifting by varying fluid flow when commanded by the PCM.
- 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.
- TFT: Transmission Fluid Temperature. Indicates the temperature of transmission fluid.
- TR: Transmission Range. The range in which the transmission is operating.
- TSS: Turbine Shaft Speed. Indicates the rotational speed of the transmission turbine shaft.
- VSS: Vehicle Speed Sensor. A magnetic pickup device that generates an AC signal that is proportional to the vehicle speed.
- VSOUT: Vehicle Speed Output. A pulse width modulated vehicle speed signal.