Equus 3145 - Digital Ford Code Reader (1981 - 1995) - Manual (Page 84)

Glossary
GLOSSARY OF TERMS AND ABBRREVIATIONS
81 Chapter 6
ELECTRONIC SPARK TIMING – PCM controlled timing of
the ignition spark.
EMR – Electronic Module Retard, controls spark retard.
ENGINE CONTROL MODULE – A microprocessor based
device which contains electronic circuitry to control and
monitor air/fuel and emission systems, and aid in diagnostics.
EPC – Electronic Pressure Control solenoid.
EPROM – Erasable Programmable Read Only Memory.
ER – Engine running, used on some Ford system tests.
ERS – Engine RPM Sensor.
ESA – Electronic Spark Advance.
ESC – Electronic Spark Control.
EST – Electronic Spark Timing.
EVP – EGR Valve Position sensor or its circuit.
EVR – EGR Vacuum Regulator or its circuit.
EVRV – Electronic Vacuum Regulator Valve. Controls EGR
vacuum.
EXHAUST GAS OXYGEN SENSOR – Sensor that changes
its voltage output as exhaust gas oxygen content changes as
compared to oxygen content of the atmosphere. The constantly
changing electrical signal is used to control fuel mixture.
EXHAUST GAS RECIRCULATION – Procedure where a
small amount of exhaust gas is readmitted to combustion
chamber to reduce peak combustion temperatures, thus
reducing NOx.
FAIL SAFE – or Fail Soft: any attempt by a computer to
compensate for a fault or lost signal, usually by substituting
fixed replacement valves.
FEEDBACK CARBURETOR (FBC) – System of fuel control
employing a computer controlled solenoid that varies the
carburetors air/fuel mixture.
FEEDBACK CARBURETOR ACTUATOR – Computer
controlled stepper motor used on Ford feedback carburetors,
that varies air/fuel mixture.
FMEM – Failure Mode Effects Management. Sometimes
referred to limp-in mode.
FTO – Filter Tach Output. An output from Ford DIS TFI IV
module which provides a filtered ignition signal to the
processor in order to control dwell.
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