Reading Wiring Diagrams - Logic symbols & Abbreviations
Z-GI-10spec tableLogic symbols
Logic symbols
OR
OperationInput to A or B will produce output at C
Expressing outputLow electrical potential (L) at A and B -> No output (L) at C; High electrical potential (H) at A or B -> Output (H) at C
Simple relay circuitsTwo contacts in parallel feeding C
AND
OperationInput to A and B will produce output at C
Expressing outputHigh electrical potential (H) at A and B -> Output (H) at C; Low electrical potential (L) at A or B -> No output (L) at C
Simple relay circuitsTwo contacts in series feeding C
INV
OperationNo input to A will produce an output at B; Input to A will not produce any output at B
Expressing outputLow electrical potential (L) at A -> Ungrounds (H) B; High electrical potential (H) at A -> Grounds (L) B
Simple relay circuitsSingle inverting contact
PROCESS
OperationSimplified representation of complex functions within circuit. Describes main function. 1. Signal detector for emission control unit, cooling unit and tachometer. 2. Signal converter for turn and hazard flasher unit, breakerless transistor igniter unit, etc.
Expressing output(Examples) Breakerless transistor igniters
Simple relay circuitsSignal converter: Coil signal converted to ON/OFF signal
Abbreviations used in this booklet
Abbreviations
A
MeaningAmpere
AAS
MeaningAuto Adjusting Suspension
ABS
MeaningAnti-lock Brake System
ACV
MeaningAir Control Valve
AE
MeaningAcoustic Equilibration
AIS
MeaningAir Injection System
ALL
MeaningAutomatic Load Leveling
AS
MeaningAuto Stop
ASV
MeaningAir Supply Valve
A/C
MeaningAir Conditioner
A/F
MeaningAir Fuel
A/R
MeaningAuto Reverse
A/T
MeaningAutomatic Transmission
ACC
MeaningAccessory
ACCEL
MeaningAccelerator
ADD
MeaningAdditional
ALT
MeaningAlternator
AM
MeaningAmplitude Modulation
AMP
MeaningAmplifier
ANT
MeaningAntenna
ATP
MeaningAtmospheric Pressure
ATX
MeaningAutomatic Transaxle
B
MeaningBattery
BAC
MeaningBy-pass Air Control Valve
B/L
MeaningBi-Level
CPU
MeaningCentral Processing Unit
CSD
MeaningCold Start Device
CARB
MeaningCarburetor
CCT
MeaningCircuit
CIGAR
MeaningCigarette
COMBI
MeaningCombination
CON
MeaningConditioner
CONT
MeaningControl
DOHC
MeaningDouble Overhead Camshaft
DEF
MeaningDefroster
ECPS
MeaningElectronically Controlled Power Steering
EGI
MeaningElectronic Gasoline Injection
EGR
MeaningExhaust Gas Recirculation
ELR
MeaningEmergency Locking Retractor
ELEC
MeaningElectric
ETR
MeaningElectronic Tuner
EXH
MeaningExhaust
F
MeaningFront
FICB
MeaningFast Idle Cam Breaker
FL
MeaningFront Left
FR
MeaningFront Right
F/B
MeaningFeedback
F/I
MeaningFuel Injector
FM
MeaningFrequency Modulation
GEN
MeaningGenerator
HEI
MeaningHigh Energy Ignition
H/D
MeaningHeat/Defroster
HEAT
MeaningHeater
HI
MeaningHigh
ISC
MeaningIdle Speed Control
IS
MeaningIgnition
ILLUMI
MeaningIllumination
INT
MeaningIntermittent
JB
MeaningJoint Box
LCD
MeaningLiquid Crystal Display
LH
MeaningLeft Hand
LO
MeaningLow
LW
MeaningLow Wave
M
MeaningMotor
MIL
MeaningMalfunction Indicator Lamp
MTR
MeaningMechanical Tuning Radio
M/T
MeaningManual Transmission
MID
MeaningMiddle
MIN
MeaningMinute
MIX
MeaningMixture
MPX
MeaningMultiplex
MTX
MeaningManual Transaxle
MW
MeaningMiddle Wave
NC
MeaningNormally Closed
NO
MeaningNormally Open
OD
MeaningOver Drive
OFF
MeaningSwitch Off
ON
MeaningSwitch On
P
MeaningPower
PRCV
MeaningPressure Regulator Control Solenoid Valve
PTC
MeaningPositive Temperature Coefficient Resistor
P/S
MeaningPower Steering
PRG
MeaningPurge Solenoid Valve
QSS
MeaningQuick Start System
R
MeaningRear
RH
MeaningRight Hand
RL
MeaningRear Left
RPM
MeaningRevolution Per Minute
RR
MeaningRear Right
REC
MeaningRecirculation
SOL
MeaningSolenoid
ST
MeaningStart
SW
MeaningSwitch
SW
MeaningShort Wave
TCV
MeaningTwin Scroll Turbocharger Solenoid Valve
TICS
MeaningTriple Induction Control System
TEMP
MeaningTemperature
TR
MeaningTransistor
TWS
MeaningTotal Wiring System
V
MeaningVolt
VRIS
MeaningVariable Resonance Induction System
VENT
MeaningVentilation
VOL
MeaningVolume
W
MeaningWatt