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Glossary
GLOSSARY OF TERMS AND ABBRREVIATIONS
85 Chapter 6
SCC – Spark Control Computer.
SEFI – Sequential Electronic Fuel Injection. Injectors located
in intake ports that inject fuel triggered by ignition timing.
SELF-TEST – One of 3 subsets of Ford EEC-IV quick test
modes.
SES – Service Engine Soon light.
SFI – Sequential Fuel Injection,type of MFI with injectors
pulsed individually based on engine firing order.
SHO – Super Height Output
SIG RTN – Signal Return circuit for all sensors except HEGO.
SIL – Shift Indicator Light. Indicates to driver optimum time
to shift gears.
SIR – Supplemental Inflatable Restraint (SIR) system; air
bag.
SIS – Solenoid Idle Stop.
SOLENOID – Wire coil with a movable core which changes
position by means of electromagnetism when current flows
through the coil.
SPARK RETARD SOLENOID – Output device that receives
an output signal from Ford MCU system to bleed distributor’s
vacuum advance when spark knock occurs.
SPOUT – Spark output signal from EEC-IV processor to TFI-
IV module, used to control amount of timing retard.
SSI – Solid State Ignition system.
STI – Self Test Input (Ford) circuit in EEC or MCU systems.
Used to place computer into testing mode.
STO – Self Test Output (Ford) circuit in EEC or MCU
systems. Used by computer to send testing and fault codes to
tester.
T.V. – Throttle Valve.
TAB – Thermactor Air Bypass solenoid.
TACH INPUT – Engine rpm signal sent to computer from
ignition coil primary circuit.
TAD – Thermactor Air Diverter solenoid.
TBI – Throttle Body Injection (Fuel).
TCC – Torque Converter Clutch.
TCP – Temperature Compensating Pump.
TDC – Top Dead Center.
TFI – Thick Film Ignition module. Controls coil and ignition
operation on most Ford vehicles.
6
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