Toyota Celica 2001 User Manual

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NOTICE

When handling supplemental restraint system components (removal, installation or inspection, etc.), always follow the direction given in the repair manuals listed above to prevent accidents and supplemental restraint system malfunction.

2001 CELICA (EWD432U)

FOREWORD

This wiring diagram manual has been prepared to provide

information on the electrical system of the 2001 CELICA.

Applicable models: ZZT 230, 231 Series

For service specifications and repair procedures of the above

models other than those listed in this manual, refer to the

following manuals;

Manual Name

Pub. No.

D 2001 CELICA Repair Manual

Volume 1 Volume 2

D 2001 TOYOTA New Car Features

RM818U1 RM818U2

NCF191U

All information in this manual is based on the latest product

information at the time of publication. However, specifications

and procedures are subject to change without notice.

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2001 CELICA (EWD432U)

A INTRODUCTION

This manual consists of the following 13 sections:

No.

Section Description

INDEX Index of the contents of this manual.

INTRODUCTION Brief explanation of each section.

HOW TO USE THIS MANUAL

Instructions on how to use this manual.

TROUBLE− SHOOTING

Describes the basic inspection procedures for electrical circuits.

D ABBREVIATIONS Defines the abbreviations used in this manual.

GLOSSARY OF TERMS AND SYMBOLS

Defines the symbols and functions of major parts.

F RELAY LOCATIONS

Shows position of the Electronic Control Unit, Relays, Relay Block, etc. This section is closely related to the system circuit.

ELECTRICAL WIRING ROUTING

Describes position of Parts Connectors, Splice points, Ground points, etc. This section is closely related to the system circuit.

INDEX Index of the system circuits.

SYSTEM CIRCUITS

Electrical circuits of each system are shown from the power supply through ground points. Wiring connections and their positions are shown and classified by code according to the connection method. (Refer to the section, ”How to use this manual”). The ”System Outline” and ”Service Hints” useful for troubleshooting are also contained in this section.

I GROUND POINT Shows ground positions of all parts described in this manual.

POWER SOURCE (Current Flow Chart)

Describes power distribution from the power supply to various electrical loads.

K CONNECTOR LIST

Describes the form of the connectors for the parts appeared in this book. This section is closely related to the system circuit.

PART NUMBER OF CONNECTORS

Indicates the part number of the connectors used in this manual.

OVERALL ELECTRICAL WIRING DIAGRAM

Provides circuit diagrams showing the circuit connections.

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2001 CELICA (EWD432U)

HOW TO USE THIS MANUAL B

This manual provides information on the electrical circuits installed on vehicles by dividing them into a circuit for each system.

The actual wiring of each system circuit is shown from the point where the power source is received from the battery as far as each ground point. (All circuit diagrams are shown with the switches in the OFF position.)

When troubleshooting any problem, first understand the operation of the circuit where the problem was detected (see System Circuit section), the power source supplying power to that circuit (see Power Source section), and the ground points (see Ground Point section). See the System Outline to understand the circuit operation.

When the circuit operation is understood, begin troubleshooting of the problem circuit to isolate the cause. Use Relay Location and Electrical Wiring Routing sections to find each part, junction block and wiring harness connectors, wiring harness and wiring harness connectors, splice points, and ground points of each system circuit. Internal wiring for each junction block is also provided for better understanding of connection within a junction block. Wiring related to each system is indicated in each system circuit by arrows (from__, to__). When overall connections are required, see the Overall Electrical Wiring Diagram at the end of this manual.

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W−R

7. 5A GAUGE

487

2111

B18

FROM POWER SOURCE SYSTEM (SEE PAGE 66)

R−L

W−B

Y−G

L 4

H17

R 6

DELAY CIRCUIT

S 6

B18

R 7

BV1

G−W

G−R

G−W

(W/G)

(S/D)(S/D)

C 7

(SHIELDED)

BV1

I 5

STOP LIGHT

TO ABS ECU

15A STOP

REAR LIGHTS WARNING LIGHT [COMB. METER]

IE114

STOP LIGHT SW

STOP LIGHT RH

[REAR COMB. LIGHT RH]

STOP LIGHT RH

[REAR COMB. LIGHT LH]

HIGH MOUNTED STOP LIGHT

[A]

[B]

[I]

[D]

[F]

[H]

[E]

[J]

[M]

[N]

[K]

[L]

[G]

[C]

LIGHT FAILURE SENSOR

2001 CELICA (EWD432U)

B HOW TO USE THIS MANUAL

∗ The system shown here is an EXAMPLE ONLY. It is different to the actual

circuit shown in the SYSTEM CIRCUITS SECTION.

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2001 CELICA (EWD432U)

[A] : System Title

[B] : Indicates a Relay Block. No shading is used and

only the Relay Block No. is shown to distinguish it from the J/B

Example: Indicates Relay Block No.1

[C] : ( ) is used to indicate different wiring and

connector, etc. when the vehicle model, engine type, or specification is different.

[D] : Indicates related system.

[E] : Indicates the wiring harness and wiring harness

connector. The wiring harness with male terminal is shown with arrows ( ).

Outside numerals are pin numbers.

Female Male ( )

The first letter of the code for each wiring harness and wiring harness connector(s) indicates the component’s location, e.g, ”E” for the Engine Compartment, ”I” for the Instrument Panel and Surrounding area, and ”B” for the Body and Surrounding area.

When more than one code has the first and second letters in common, followed by numbers (e.g, IH1, IH2), this indicates the same type of wiring harness and wiring harness connector.

[F] : Represents a part (all parts are shown in sky blue).

The code is the same as the code used in parts position.

[G] : Junction Block (The number in the circle is the J/B

No. and the connector code is shown beside it). Junction Blocks are shaded to clearly separate them from other parts.

3C indicates that it is inside Junction Block No.3

Example:

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[H] : When 2 parts both use one connector in common,

the parts connector name used in the wire routing section is shown in square brackets [ ].

[I] : Indicates the wiring color.

Wire colors are indicated by an alphabetical code.

B = Black W = White BR = Brown

L = Blue V = Violet SB = Sky Blue

R = Red G = Green LG = Light Green

P = Pink Y = Yellow GR = Gray

O = Orange

The first letter indicates the basic wire color and the second letter indicates the color of the stripe.

Example: L − Y

(Blue)Y(Yellow)

[J] : Indicates a wiring Splice Point (Codes are ”E” for the

Engine Room, ”I” for the Instrument Panel, and ”B” for the Body).

The Location of splice Point I 5 is indicated by the shaded section.

[K] : Indicates a shielded cable.

[L] : Indicates the pin number of the connector.

The numbering system is different for female and male connectors.

Example:

Numbered in order from upper left to lower right

Numbered in order from upper right to lower left

Female

Male

[M] : Indicates a ground point.

The first letter of the code for each ground point(s) indicates the component’s location, e.g, ”E” for the Engine Compartment, ”I” for the Instrument Panel and Surrounding area, and ”B” for the Body and Surrounding area.

[N] : Page No.

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[O]

[P]

[Q]

[R]

[S]

[T]

[U]

[V]

2001 CELICA (EWD432U)

B HOW TO USE THIS MANUAL

Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW. When the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL 8 of the light failure sensor, and also flows through the rear lights warning light to TERMINAL 4 of the light failure sensor.

STOP LIGHT DISCONNECTION WARNING

When the ignition SW is turned on and the brake pedal is pressed (Stop light SW on), if the stop light circuit is open, the current flowing from TERMINAL 7 of the light failure sensor to TERMINALS 1, 2 changes, so the light failure sensor detects the disconnection and the warning circuit of the light failure sensor is activated. As a result, the current flows from TERMINAL 4 of the light failure sensor to TERMINAL 11 to GROUND and turns the rear lights warning light on. By pressing the brake pedal, the current flowing to TERMINAL 8 of the light failure sensor keeps the warning circuit on and holds the warning light on until the ignition SW is turned off.

S6 STOP LIGHT SW

2−1 : Closed with the brake pedal depressed

L4 LIGHT FAILURE SENSOR

1, 2, 7−GROUND : Approx. 12 volts with the stop light SW on

4, 8−GROUND : Approx. 12 volts with the ignition SW at ON position

11−GROUND : Always continuity

: PARTS LOCATION

Code See Page Code See Page Code See Page

C7 34 L4 36 R7 37

H17 36 R6 37 S6 35

: RELAY BLOCKS

Code See Page Relay Blocks (Relay Block Location)

1 18 R/B No.1 (Instrument Panel Left)

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: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

IB 20 Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)

3C 22 Instrument Panel Wire and J/B No.3 (Instrument Panel Left Side)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)

IE1 42 Floor Wire and Instrument Panel Wire (Left Kick Panel)

BV1 50 Luggage Room Wire and Floor Wire (Luggage Compartment Left)

: GROUND POINTS

Code See Page Ground Points Location

BL 50 Under the Left Quarter Pillar

BO 50 Back Panel Center

: SPLICE POINTS

Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points

I5 44 Cowl Wire B18 50 Luggage Room Wire

SYSTEM OUTLINE

SERVICE HINTS

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2001 CELICA (EWD432U)

[O] : Explains the system outline.

[P] : Indicates values or explains the function for reference during troubleshooting.

[Q] : Indicates the reference page showing the position on the vehicle of the parts in the system circuit.

Example : Part ”L4” (Light Failure Sensor) is on page 36 of the manual.

∗ The letter in the code is from the first letter of the part, and the number indicates its order in parts

starting with that letter.

Example : L 4

Parts is 4th in order Light Failure Sensor

[R] : Indicates the reference page showing the position on the vehicle of Relay Block Connectors in the system circuit.

Example : Connector ”1” is described on page 18 of this manual and is installed on the left side of the instrument

panel.

[S] : Indicates the reference page showing the position on the vehicle of J/B and Wire Harness in the system circuit.

Example : Connector ”3C” connects the Instrument Panel Wire and J/B No.3. It is described on page 22 of this

manual, and is installed on the instrument panel left side.

[T] : Indicates the reference page describing the wiring harness and wiring harness connector (the female wiring

harness is shown first, followed by the male wiring harness).

Example : Connector ”IE1” connects the floor wire (female) and Instrument panel wire (male). It is described on

page 42 of this manual, and is installed on the left side kick panel.

[U] : Indicates the reference page showing the position of the ground points on the vehicle.

Example : Ground point ”BO” is described on page 50 of this manual and is installed on the back panel center.

[V] : Indicates the reference page showing the position of the splice points on the vehicle.

Example : Splice point ”I5” is on the Cowl Wire Harness and is described on page 44 of this manual.

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2001 CELICA (EWD432U)

B HOW TO USE THIS MANUAL

The ground points circuit diagram shows the connections from all major parts to the respective ground points. When troubleshooting a faulty ground point, checking the system circuits which use a common ground may help you identify the problem ground quickly. The relationship between ground points ( EA,

and IC shown below) can also be

checked this way.

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I GROUND POINT

FAN MAIN RELAY

A/C FAN RELAY NO.2

A/C FAN RELAY NO.3

RADIATOR FAN MOTOR

RETRACT CONTROL RELAY

RETRACT MOTOR RH

RETRACT MOTOR LH

FRONT TURN SIGNAL LIGHT RH

PARKING LIGHT RH

FRONT TURN SIGNAL LIGHT LH

PARKING LIGHT LH

DOOR LOCK CONTROL SW RH

DOOR KEY LOCK SW RH

DOOR LOCK MOTOR RH

BLOWER RESISTOR

A/C AMPLIFIER

RADIO AND PLAYER

HEATER RELAY

AUTO ANTENNA MOTOR

BLOWER SW

PARKING BRAKE SW

COMBINATION METER

HORN SW [COMB. SW]

TURN SIGNAL FLASHER

DOOR KEY LOCK SW LH

DOOR LOCK MOTOR LH

FUEL CONTROL SW

WOOFER AMPLIFIER

COMBINATION METER

FUEL SENDER

CIGARETTE LIGHTER

O/D MAIN SW

CLOCK

444

BA1

IB1

EA210

ID1

IC3

IA1

E 3

W−B

W−BW−B

W−B

W−BW−B

W−B

BR BR

W−B

BRBR

W−B

W−B (4A−GZE)

W−B

I 6

I 2

B 5

I 5

B 5

I 5

I 3I 3

E 3

E 2

E 4

E 5

E 4

E 5

E 6E 4

E 4

B 4

I 4

B 4

I 4 I 8

IB IC

JUNCTION CONNECTOR

J 1

DOOR LOCK CONTROL

RELAY

ELECTRICAL IDLE−UP CUT RELAY (M/T)

FRONT SIDE MARKER LIGHT RH

FRONT SIDE MARKER LIGHT LH

BRAKE FLUID LEVEL WARNING SW

UNLOCK WARNING SW

WIPER AND WASHER SW [COMB. SW]

LIGHT CONTROL SW [COMB. SW]

HEATER CONTROL ASSEMBLY

HEATER SERVO MOTOR AMPLIFIER

DIMMER SW [COMB. SW]

CRUISE CONTROL MIRROR SW

REAR WINDOW DEFOGGER SW

POWER WINDOW MASTER SW

POWER WINDOW CONTROL RELAY

DOOR LOCK CONTROL SW

REMOTE CONTROL MIRROR SW

∗ The system shown here is an EXAMPLE ONLY. It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION.

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2001 CELICA (EWD432U)

The ”Current Flow Chart” section, describes which parts each power source (fuses, fusible links, and circuit breakers) transmits current to. In the Power Source circuit diagram, the conditions when battery power is supplied to each system are explained. Since all System Circuit diagrams start from the power source, the power source system must be fully understood.

Theft Deterrent and Door Lock Control

J POWER SOURCE (Current Flow Chart)

EA11EA23

EB1

E 6

E 7

I 2

E 7

BBBBB

W−B

B−O

B−W

W−B

B−W

STARTER RELAY

INJECTION RELAY

15A HAZ−RADIO

7.5A AM2

50A MAIN

1.25B FL MAIN

BATTERY

W−L

G−W

15A TAIL

20A DEFOG

15A RAD CIG

TAIL RELAY

7.5A DOME

40A DOOR LOCK CB

W−R

P−L

B−Y

W−R

AM2IG2

ACC

IG1

AM1

W−R

W−B

2 1

IGNITION SW

I 8

Battery

30A AM2

Starter S 2

20A RADIO NO.1

10A HORN

15A EFI

7.5A DOME

Short Pin

10A HAZARD

The chart below shows the route by which current flows from the battery to each electrical source (Fusible Link, Circuit Breaker, Fuse, etc.) and other parts.

Engine Room R/B (See Page 20)

ABS ABS and Traction Control Cruise Control Electronically Controlled Transmission and A/T Indicator Multiplex Communication System

Cigarette Lighter and Clock

Key Reminder and Seat Belt Warning

STOP

Fuse Page

194

214

112

System

DOME

20A

10A

Combination Meter Headlight Interior Light

100A ALT

EB1

POWER SOURCE

Light Auto Turn Off

187 180 166 210

230

122

10A ECU−B

60A ABS

Fusible Link Block

∗ The system shown here is an EXAMPLE ONLY. It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION.

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BLACK

[D]

K CONNECTOR LIST

J4 K1 K2 L1

L2 L3 L4 M1 M2 M3

M4 N1 N2 O1 O2

DARK GRAY

GRAY

DARK GRAY

BLACKGRAYGRAY

ABB AABCCCDDDD

A A

AAA

1 2

12 3 6 7 8 9 101112

12 3456 8

123

234 8910

1 7

[A]

[C]

[B]

678

AAA

ABB AABCCCDDDD

I14 I15 I16 J1 J2

DARK GRAY GRAY BLACK

2001 CELICA (EWD432U)

B HOW TO USE THIS MANUAL

[A] : Indicates connector to be connected to a part. (The numeral indicates the pin No.)

[B] : Junction Connector

Indicates a connector which is connected to a short terminal.

Junction Connector

Short Terminal

Same Color

Junction connector in this manual include a short terminal which is connected to a number of wire harnesses. Always perform inspection with the short terminal installed. (When installing the wire harnesses, the harnesses can be connected to any position within the short terminal grouping. Accordingly, in other vehicles, the same position in the short terminal may be connected to a wire harness from a different part.) Wire harness sharing the same short terminal grouping have the same color.

[C] : Parts Code

The first letter of the code is taken from the first letter of part, and the numbers indicates its order in parts which start with the same letter.

[D] : Connector Color

Connectors not indicated are milky white in color.

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2001 CELICA (EWD432U)

[A] : Part Code

[B] : Part Name

[C] : Part Number

Toyota Part Number are indicated.

Not all of the above part numbers of the connector are established for the supply. In case of ordering a connector or terminal with wire, please confirm in advance if there is supply for it using “Parts Catalog News” (published by Parts Engineering Administration Dept.).

A 5

90980−11194

L PART NUMBER OF CONNECTORS

Code Part Name Part Number Code Part Name Part Number

A 1

A 2

A 4

A 6

A 7

A/C Ambient Temp. Sensor

A/C Condenser Fan Motor

A/C Triple Pressure SW (A/C Dual and Single Pressure SW)

A/T Oil Temp. Sensor

ABS Actuator

90980−11070

90980−11237

90980−10943

90980−11413

90980−11151

D 4

D 5

D 6

D 7

D 8

D 9

D10

D11

Diode (Door Courtesy Light)

Diode (Key Off Operation)

Diode (Luggage Compartment Light)

Door Lock Control Relay

Door Courtesy Light LH

Door Courtesy Light RH

Door Courtesy SW LH

Door Courtesy SW RH

90980−11608

90980−10962

90980−11608

90980−10848

90980−11148

90980−11097

A 8

ABS Speed Sensor Front LH

90980−10941

A 9

ABS Speed Sensor Front RH

90980−11856

A10

Airbag Sensor Front LH

A11

Airbag Sensor Front RH

D12

Door Courtesy SW Front LH

90980−11156

D13

Door Courtesy SW Front RH

D14

Door Courtesy SW Rear LH

Door Courtesy SW Rear RH

D15

[B]

[C]

A12

Auto Antenna Motor

90980−11194

A 3

A/C Condenser Fan Relay

90980−10940

[A]

90980−11009

90980−11002

D16

D17

Door Key Lock and Unlock SW LH

Door Key Lock and Unlock SW RH

90980−11170

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To Ignition SW IG Terminal

Fuse

VoltmeterSW 1

Relay

SW 2

Solenoid

[A]

[B]

[C]

Ohmmeter

Diode

Digital Type Analog Type

2001 CELICA (EWD432U)

C TROUBLESHOOTING

VOLTAGE CHECK

(a) Establish conditions in which voltage is present at the check

point. Example:

[A] − Ignition SW on [B] − Ignition SW and SW 1 on [C] − Ignition SW, SW 1 and Relay on (SW 2 off)

(b) Using a voltmeter, connect the negative lead to a good ground

point or negative battery terminal, and the positive lead to the connector or component terminal. This check can be done with a test light instead of a voltmeter.

CONTINUITY AND RESISTANCE CHECK

(a) Disconnect the battery terminal or wire so there is no voltage

between the check points.

(b) Contact the two leads of an ohmmeter to each of the check

points.

If the circuit has diodes, reverse the two leads and check again. When contacting the negative lead to the diode positive side and the positive lead to the negative side, there should be continuity. When contacting the two leads in reverse, there should be no continuity.

minimum) for troubleshooting of the electrical circuit.

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To Ignition SW IG Terminal

Test Light

RelayLight

SW 2 Solenoid

Disconnect

Short [A]

Disconnect

SW 1

Fuse Case

Short [B]

Short [C]

Pull Up

Press Down Press Down

Pull Up

2001 CELICA (EWD432U)

FINDING A SHORT CIRCUIT

(a) Remove the blown fuse and disconnect all loads of the fuse. (b) Connect a test light in place of the fuse. (c) Establish conditions in which the test light comes on.

Example:

[A] − Ignition SW on [B] − Ignition SW and SW 1 on [C] − Ignition SW, SW 1 and Relay on (Connect the

Relay) and SW 2 off (or Disconnect SW 2)

(d) Disconnect and reconnect the connectors while watching the

test light. The short lies between the connector where the test light stays lit and the connector where the light goes out.

(e) Find the exact location of the short by lightly shaking the

problem wire along the body.

CAUTION:

(a) Do not open the cover or the case of the ECU unless

absolutely necessary. (If the IC terminals are touched, the IC may be destroyed by static electricity.)

(b) When replacing the internal mechanism (ECU part) of

the digital meter, be careful that no part of your body or clothing comes in contact with the terminals of leads from the IC, etc. of the replacement part (spare part).

DISCONNECTION OF MALE AND FEMALE CONNECTORS

To pull apart the connectors, pull on the connector itself, not the wire harness.

HINT : Chec k to see what k ind of connector you are

disconnecting before pulling apart.

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0.2

(mm)

Reference:

Tool

Example: (Case 1)

Terminal Retainer

[Retainer at Full Lock Position]

[Retainer at Temporary Lock Position]

Stopper

Terminal Retainer

Secondary Locking Device

Example: (Case 2)

2001 CELICA (EWD432U)

C TROUBLESHOOTING

HOW TO REPLACE TERMINAL (with terminal retainer or secondary locking device)

1. PREPARE THE SPECIAL TOOL

HINT : To remove the terminal from the connector, please

construct and use the special tool or like object shown on the left.

2. DISCONNECT CONNECTOR

3. DISENGAGE THE SECONDARY LOCKING DEVICE OR

TERMINAL RETAINER.

(a) Locking device must be disengaged before the terminal

locking clip can be released and the terminal removed from the connector.

(b) Use a special tool or the terminal pick to unlock the secondary

locking device or terminal retainer.

NOTICE: Do not remove the terminal retainer from connector body.

[A] For Non−Waterproof Type Connector

HINT : The needle insertion position varies according to the

connector’s shape (number of terminals etc.), so

check the position before inserting it.

”Case 1”

Raise the terminal retainer up to the temporary lock

position.

”Case 2”

Open the secondary locking device.

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Tool

Ta b

Terminal Retainer

Access Hole

( Mark)

Tool

[Female]

Example:

[Male]

(Case 1)

[Male] [Female]

Retainer at Full Lock Position

Retainer at Temporary Lock Position

Terminal Retainer

[Male]

Press Down

[Female]

Press Down

Tool

Example: (Case 2)

2001 CELICA (EWD432U)

[B] For Waterproof Type Connector

HINT : Term inal retainer color is different

according to connector body.

Example: Terminal Retainer : Connector Body Black or White : Gray Black or White : Dark Gray Gray or White : Black

”Case 1”

Type where terminal retainer is pulled up to the temporary lock position (Pull Type).

Insert the special tool into the terminal retainer access hole (YMark) and pull the terminal retainer up to the temporary lock position.

HINT : The needle insertion position varies

according to the connector’s shape (Number of terminals etc.), so check the position before inserting it.

”Case 2”

Type which cannot be pulled as far as Power Lock insert the tool straight into the access hole of terminal retainer as shown.

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Retainer at Full Lock Position

[Male] [Female]

Retainer at Temporary Lock Position

Locking Lug

Tool

2001 CELICA (EWD432U)

C TROUBLESHOOTING

Push the terminal retainer down to the temporary lock position.

from rear.

4. INSTALL TERMINAL TO CONNECTOR

(a) Insert the terminal.

HINT:

1. Make sure the terminal is positioned correctly.

2. Insert the terminal until the locking lug locks firmly.

3. Insert the terminal with terminal retainer in the temporary lock position.

(b) Push the secondary locking device or terminal retainer in to

the full lock position.

5. CONNECT CONNECTOR

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∗ The titles given inside the components are the names of the terminals (terminal codes) and are not treated as being

abbreviations.

2001 CELICA (EWD432U)

ABBREVIATIONS D

ABBREVIATIONS

The following abbreviations are used in this manual.

ABS = Anti−Lock Brake System

A/C = Air Conditioning

ACIS = Acoustic Control Induction System

A/T = Automatic Transaxle

COMB. = Combination

ECU = Electronic Control Unit

EFI = Electronic Fuel Injection

ESA = Electronic Spark Advance

EVAP = Evaporative Emission

FL = Fusible Link

IC = Integrated Circuit

J/B = Junction Block

LH = Left−Hand

MPX = Multiplex

M/T = Manual Transaxle

O/D = Overdrive

R/B = Relay Block

RH = Right−Hand

SFI = Sequential Multiport Fuel Injection

SRS = Supplemental Restraint System

SW = Switch

TEMP. = Temperature

VSV = Vacuum Switching Valve

w/ = With

w/o = Without

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2001 CELICA (EWD432U)

E GLOSSARY OF TERMS AND SYMBOLS

BATTERY

Stores chemical energy and converts it into electrical energy. Provides DC current for the auto’s various electrical circuits.

GROUND

The point at which wiring attaches to the Body, thereby providing a return path for an electrical circuit; without a ground, current cannot flow.

CAPACITOR (Condenser)

A small holding unit for temporary storage of electrical voltage.

HEADLIGHTS

Current flow causes a headlight filament to heat up and emit light. A headlight may have either a single (1) filament or a double (2) filament

1. SINGLE FILAMENT

2. DOUBLE FILAMENT

CIGARETTE LIGHTER

An electric resistance heating element.

CIRCUIT BREAKER

Basically a reusable fuse, a circuit breaker will heat and open if too much current flows through it. Some units automatically reset when cool, others must be manually reset.

HORN

An electric device which sounds a loud audible signal.

DIODE

A semiconductor which allows current flow in only one direction.

IGNITION COIL

Converts low−voltage DC current into high−voltage ignition current for firing the spark plugs.

DIODE, ZENER

A diode which allows current flow in one direction but blocks reverse flow only up to a specific voltage. Above that potential, it passes the excess voltage. This acts as a simple voltage regulator.

LIGHT

Current flow through a filament causes the filament to heat up and emit light.

PHOTODIODE

The photodiode is a semiconductor which controls the current flow according to the amount of light.

LED (LIGHT EMITTING DIODE)

Upon current flow, these diodes emit light without producing the heat of a comparable light.

DISTRIBUTOR, IIA

Channels high−voltage current from the ignition coil to the individual spark plugs.

METER, ANALOG

Current flow activates a magnetic coil which causes a needle to move, thereby providing a relative display against a background calibration.

FUSE

A thin metal strip which burns through when too much current flows through it, thereby stopping current flow and protecting a circuit from damage.

FUSIBLE LINK

A heavy−gauge wire placed in high amperage circuits which burns through on overloads, thereby protecting the circuit. The numbers indicate the crosssection surface area of the wires.

(for Medium Current Fuse)

(for High Current Fuse or Fusible Link)

METER, DIGITAL

Current flow activates one or many LED’s, LCD’s, or fluorescent displays, which provide a relative or digital display.

FUEL

MOTOR

A power unit which converts electrical energy into mechanical energy, especially rotary motion.

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2001 CELICA (EWD432U)

RELAY

Basically, an electrically operated switch which may be normally closed (1) or open (2). Current flow through a small coil creates a magnetic field which either opens or closes an attached switch.

1. NORMALLY CLOSED

2. NORMALLY OPEN

RELAY, DOUBLE THROW

A relay which passes current through one set of contacts or the other.

SWITCH, MANUAL

Opens and closes circuits, thereby stopping (1) or allowing (2) current flow.

1. NORMALLY OPEN

2. NORMALLY CLOSED

SPEAKER

An electromechanical device which creates sound waves from current flow.

RESISTOR

An electrical component with a fixed resistance, placed in a circuit to reduce voltage to a specific value.

SWITCH, DOUBLE THROW

A switch which continuously passes current through one set of contacts or the other.

RESISTOR, TAPPED

A resistor which supplies two or more different non adjustable resistance values.

SWITCH, IGNITION

A key operated switch with several positions which allows various 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)

A resistor which varies its resistance with temperature.

SWITCH, WIPER PARK

Automatically returns wipers to the stop position when the wiper switch is turned off.

(Reed Switch Type)

SENSOR, SPEED

Uses magnetic impulses to open and close a switch to create a signal for activation of other components.

TRANSISTOR

A solidstate device typically used as an electronic relay; stops or passes current depending on the voltage applied at ”base”.

SHORT PIN

Used to provide an unbroken connection within a junction block.

WIRES

Wires are always drawn as straight lines on wiring diagrams. Crossed wires (1) without a black dot at the junction are not joined; crossed wires (2) with a black dot or octagonal ( ) mark at the junction are spliced (joined) connections.

(1) NOT CONNECTED

(2) SPLICED

SOLENOID

An electromagnetic coil which forms a magnetic field when current flows, to move a plunger, etc.

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