Glossary
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ROM:
Read-Only Memory. Permanent programming information stored inside the
PCM, containing the information the PCM needs to operate a specific vehicle
model/engine combination.
RPM:
Revolutions Per Minute
SAE:
Society of Automotive Engineers.
Scan Tool:
A device that interfaces with and communicates information on a data link.
SDM:
Sensing and Diagnostic Module
Sensor x:
A standard term used to identify the location of oxygen sensors. Sensor 1 is
located upstream of the catalytic converter. See O2S, Bank 1, Bank 2.
Sensor:
Any device that reports information to the PCM. The job of the sensor is to
convert a parameter such as engine temperature into an electrical signal that the
PCM can understand.
SFI or SEFI:
Sequential Fuel Injection or Sequential Electronic Fuel Injection. A fuel injection
system that uses one or more injectors for each cylinder. The injectors are
mounted in the intake manifold and are fired individually.
Solenoid:
A device consisting of an electrical coil which when energized, produces a
magnetic field in a plunger, which is pulled to a central position. A solenoid may
be used as an actuator in a valve or switch.
STFT:
Short Term Fuel Trim.
STS:
Service Throttle Soon
TAC:
Throttle Actuator Control
TBI:
Throttle Body Injection. A fuel injection system having one or more injectors
mounted in a centrally located throttle body, as opposed to positioning the
injectors close to an intake valve port. TBI is also called Central Fuel Injection
(CFI) in some vehicles.
TCC:
Torque Converter Clutch
TCM:
Transmission Control Module
TCS:
Traction Control System for PCM and brakes
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