Glossary “Service Bay Diagnosis System” Definition:
(SBDS) A computerized information network system that is connected, often by satellite, to the vehicle manufacturer and used to answer service and diagnostic questions.
service access gauge-port valve
Glossary “service access gauge-port valve” Definition:
Fittings found on some service valves and some control devices used to access the system for testing and service.
serrated rod cap
Glossary “serrated rod cap” Definition:
Connecting rod cap that has serrated parting edges to help maintain alignment with the rod.
serrated nut
Glossary “serrated nut” Definition:
Self-locking type of nut having serrations on its contact side to prevent it from loosening when tightened.
serpentine belt
Glossary “serpentine belt” Definition:
A wide, flat belt having multi-V-grooves to provide friction contact with the pulleys that winds through all of the engine accessories to drive them off the crankshaft pulley.
series wound
Glossary “series wound” Definition:
In a starter motor, the field coils (windings) and the armature, are wired in series. All current flows through the field coils, through the hot brushes, through the armature, then to the ground through the ground brushes.
series parallel system
Glossary “series parallel system” Definition:
An arrangement where two 12-volt batteries are connected in such a manner as to provide 24-volts for starting and 12-volts for accessories and charging.
series parallel circuit
Glossary “series parallel circuit” Definition:
Circuit in which some components are in series while others are in parallel.
series number
Glossary “series number” Definition:
Term used for tire aspect ratio.
series circuit
Glossary “series circuit” Definition:
Circuit having only one path through which the current or fluid can flow, having to pass through one component before going on to another.
serial data
Glossary “serial data” Definition:
The pulse train data signal sent on the communication line between the computer and the scan tool.
ser
Glossary “ser” Definition:
Acronym form of Serial, or Series, or Service
sequentially fired
Glossary “sequentially fired” Definition:
Type of fuel delivery system in which the fuel injectors are fired individually according to ignition firing order and valve timing.
sequential-port fuel injection (SPFI)
Glossary “sequential-port fuel injection (SPFI)” Definition:
Type of multi-port injection system where individual fuel injectors are pulsed sequentially, one after another in the same firing order as the spark plugs, rather than being pulsed simultaneously. This allows more precise fuel control for lower emissions and better performance. Also known as sequential fuel injection.
sequential logic circuits
Glossary “sequential logic circuits” Definition:
A flip-flop circuit in which the output is determined by the sequence of inputs. A given input affects the output produced by the next input
sequential injection
Glossary “sequential injection” Definition:
Fuel injection system where the injectors fire from individual drivers, in the same sequence as the engines firing order.
sequential fuel injection
Glossary “sequential fuel injection” Definition:
Term used for sequential-ported fuel injection.
separator pulse
Glossary “separator pulse” Definition:
A pulse code consisting of a signal half-second pulse between the last service code and the first continuous code of a data stream
separator disc
Glossary “separator disc” Definition:
Metal plates in the multi-plate clutch that separates the friction discs.
separator
Glossary “separator” Definition:
1). A tank-like device used to remove liquids from a vapor, such as oil from refrigerant. 2). A nonconductive divider placed between the positive and negative plates of a battery.