Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf ewdtmc2 ewdtmpdf ewdsourc 2002 024runne glossary glossary
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E GLOSSARY OF TERMS AND SYMBOLS
BATTERY GROUND
Stores chemical energy and The point at which wiring attaches to
converts it into electrical energy. the Body, thereby providing a return
Provides DC current for the auto's path for an electrical circuit; without a
various electrical circuits. ground, current cannot flow.
CAPACITOR (Condenser) HEADLIGHTS
A small holding unit for temporary Current flow causes a headlight
storage of electrical voltage. 1. SINGLE
FILAMENT filament to heat up and emit light. A
headlight may have either a single
(1) filament or a double (2) filament
CIGARETTE LIGHTER
An electric resistance heating 2. DOUBLE
element. FILAMENT
CIRCUIT BREAKER HORN
Basically a reusable fuse, a circuit An electric device which sounds a
breaker will heat and open if too loud audible signal.
much current flows through it.
Some units automatically reset when
cool, others must be manually reset.
DIODE IGNITION COIL
A semiconductor which allows Converts low-voltage DC current
current flow in only one direction. into high-voltage ignition current for
firing the spark plugs.
DIODE, ZENER LIGHT
A diode which allows current flow in one Current flow through a filament
direction but blocks reverse flow only up causes the filament to heat up and
to a specific voltage. Above that potential, emit light.
it passes the excess voltage. This acts as
a simple voltage regulator.
PHOTODIODE LED (LIGHT EMITTING DIODE)
The photodiode is a semiconductor Upon current flow, these diodes emit
which controls the current flow light without producing the heat of a
according to the amount of light. comparable light.
DISTRIBUTOR, IIA METER, ANALOG
Channels high-voltage current from Current flow activates a magnetic
the ignition coil to the individual coil which causes a needle to move,
spark plugs. thereby providing a relative display
against a background calibration.
FUSE METER, DIGITAL
A thin metal strip which burns through Current flow activates one or many
when too much current flows through it, LED's, LCD's, or fluorescent
FUEL
thereby stopping current flow and displays, which provide a relative or
protecting a circuit from damage. digital display.
FUSIBLE LINK
(for Medium Current Fuse) A heavy-gauge wire placed in high
amperage circuits which burns through on MOTOR
overloads, thereby protecting the circuit. A power unit which converts
The numbers indicate the crosssection M
electrical energy into mechanical
surface area of the wires. energy, especially rotary motion.
(for High Current Fuse or
Fusible Link)
2002 4RUNNER (EWD471U)
18
E
RELAY SPEAKER
Basically, an electrically operated An electromechanical device which
1. NORMALLY switch which may be normally creates sound waves from current
CLOSED closed (1) or open (2). flow.
Current flow through a small coil
creates a magnetic field which either
opens or closes an attached switch.
2. NORMALLY SWITCH, MANUAL
OPEN Opens and closes
circuits, thereby
i it th b
1. NORMALLY stopping (1) or
OPEN allowing (2) current
flow.
RELAY, DOUBLE THROW
A relay which passes current 2. NORMALLY
through one set of contacts or the CLOSED
other.
RESISTOR SWITCH, DOUBLE THROW
An electrical component with a fixed A switch which continuously passes
resistance, placed in a circuit to current through one set of contacts
reduce voltage to a specific value. or the other.
RESISTOR, TAPPED SWITCH, IGNITION
A resistor which supplies two or A key operated switch with several
more different non adjustable positions which allows various
resistance values. circuits, particularly the primary
ignition circuit, to become
operational.
RESISTOR, VARIABLE or RHEOSTAT
A controllable resistor with a variable
rate of resistance.
Also called a potentiometer or
rheostat.
SENSOR (Thermistor) SWITCH, WIPER PARK
A resistor which varies its resistance Automatically returns wipers to the
with temperature. stop position when the wiper switch
is turned off.
SENSOR, SPEED TRANSISTOR
Uses magnetic impulses to open A solidstate device typically used as
and close a switch to create a signal an electronic relay; stops or passes
for activation of other components. current depending on the voltage
(Reed Switch Type) applied at "base".
SHORT PIN
WIRES
Used to provide an unbroken
Wires are always drawn as
connection within a junction block. (1) NOT straight lines on wiring
CONNECTED diagrams.
Crossed wires (1) without a
black dot at the junction are
j
not joined;
tj i d
SOLENOID crossed wires (2) with a
An electromagnetic coil which forms black dot or octagonal ( )
a magnetic field when current flows, (2) SPLICED mark at the junction are
to move a plunger, etc. spliced (joined)
connections.
2002 4RUNNER (EWD471U)
19
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