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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Glossary
B
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 1:
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 2:
A standard term used to identify the location of oxygen sensors. Sensor 2 is located
downstream 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 under-
stand.
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.
ST:
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
TDC:
Top Dead Center. When a piston is at its uppermost position in the cylinder.