Download document 7903040

B HOW TO USE THIS MANUAL
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B HOW TO USE THIS MANUAL
[N]
System Outline
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B HOW TO USE THIS MANUAL
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J POWER SOURCE (Current Flow Chart)
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H
B HOW TO USE THIS MANUAL
K CONNECTOR LIST
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[A]
I16
J1
J2
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[B]
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B
L PART NUMBER OF CONNECTORS
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33
C TROUBLESHOOTING
To Ignition SW
IG Terminal
(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)
Fuse
[A]
SW 1
VOLTAGE CHECK
Voltmeter
[B]
(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.
Relay
[C]
Solenoid
SW 2
CONTINUITY AND RESISTANCE CHECK
(a) Disconnect the battery terminal or wire so there is no voltage
between the check points.
Ohmmeter
(b) Contact the two leads of an ohmmeter to each of the check
points.
SW
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.
Ohmmeter
Diode
Digital Type
Analog Type
(c) Use a volt/ohmmeter with high impedance (10 kΩ/V
minimum) for troubleshooting of the electrical circuit.
12
LAND CRUISER / LAND CRUISER PRADO (EWD527E)
C
To Ignition SW
IG Terminal
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.
Test Light
Fuse Case
Short [A]
SW 1
Short [B]
Disconnect
Disconnect
Light
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.
Relay
CAUTION:
Short [C]
Disconnect
SW 2
Solenoid
(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 : Check to see what kind of connector you are
disconnecting before pulling apart.
Pull Up
Press Down
Pull Up
Press Down
13
LAND CRUISER / LAND CRUISER PRADO (EWD527E)
C TROUBLESHOOTING
HOW TO REPLACE TERMINAL
(with terminal retainer or secondary locking device)
Reference:
1. PREPARE THE SPECIAL TOOL
10
3
1
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
0.2
1
(mm)
Example:
(Case 1)
Up
Tool
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.
Terminal Retainer
[A]
Terminal Retainer
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"
[Retainer at Full Lock Position]
Raise the terminal retainer up to the temporary lock
position.
Stopper
Terminal
Retainer
[Retainer at Temporary Lock Position]
Example:
(Case 2)
Secondary
Locking Device
"Case 2"
Open the secondary locking device.
14
LAND CRUISER / LAND CRUISER PRADO (EWD527E)
C
Tool
Tab
Tab
Example:
(Case 1)
[B]
Terminal
Retainer
Tool
[Male]
Access Hole
(
Mark)
Tool
For Waterproof Type Connector
HINT : Terminal retainer color is different
according to connector body.
Example:
Terminal Retainer
Black or White
Black or White
Gray or White
: Connector Body
: Gray
: Dark Gray
: Black
[Female]
"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.
Retainer
at Full 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.
Retainer
at Temporary Lock Position
[Male]
Example:
(Case 2)
[Female]
"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.
Terminal Retainer
Tool
Tool
[Male]
Press Down
Press Down
[Female]
15
LAND CRUISER / LAND CRUISER PRADO (EWD527E)
C TROUBLESHOOTING
Push the terminal retainer down to the temporary lock position.
Retainer at
Full Lock Position
Retainer at
Temporary Lock Position
[Male]
[Female]
(c) Release the locking lug from terminal and pull the terminal out
from rear.
Locking Lug
Tool
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
16
LAND CRUISER / LAND CRUISER PRADO (EWD527E)
ABBREVIATIONS D
ABBREVIATIONS
The following abbreviations are used in this manual.
4WD
=
Four Wheel Drive Vehicles
A/C
=
Air Conditioner
A/T
=
Automatic Transmission
ABS
=
Anti-Lock Brake System
BA
=
Brake Assist
CD
=
Compact Disc
COMB. =
Combination
DIFF.
=
Differential
DLC3
=
Data Link Connector 3
ECT
=
Electronic Control Transmission
ECU
=
Electronic Control Unit
EFI
=
Electronic Fuel Injection
EGR
=
Exhaust Gas Recirculation
EVAP
=
Evaporative Emission
ISC
=
Idle Speed Control
J/B
=
Junction Block
LH
=
Left-Hand
LHD
=
Left-Hand Drive
M/T
=
Manual Transmission
MPX
=
Multiplex
PTC
=
Positive Temperature Coefficient
R/B
=
Relay Block
RH
=
Right-Hand
RHD
=
Right-Hand Drive
SW
=
Switch
TEMP.
=
Temperature
TRC
=
Traction Control
VRV
=
Vacuum Regulating Valve
VSC
=
Vehicle Stability Control
VSV
=
Vacuum Switching Valve
VVT
=
Variable Valve Timing
w/
=
With
w/o
=
Without
∗ The titles given inside the components are the names of the terminals (terminal codes) and are not treated as being
abbreviations.
17
LAND CRUISER / LAND CRUISER PRADO (EWD527E)
E GLOSSARY OF TERMS AND SYMBOLS
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.
BATTERY
Stores chemical energy and
converts it into electrical energy.
Provides DC current for the auto's
various electrical circuits.
CAPACITOR (Condenser)
A small holding unit for temporary
storage of electrical voltage.
CIGARETTE LIGHTER
An electric resistance heating
element.
HEADLIGHTS
Current flow causes a headlight
1. SINGLE
FILAMENT filament to heat up and emit light. A
headlight may have either a single
(1) filament or a double (2) filament
2. DOUBLE
FILAMENT
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
LIGHT
Current flow through a filament
causes the filament to heat up and
emit light.
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.
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
METER, DIGITAL
Current flow activates one or many
LED's, LCD's, or fluorescent
displays, which provide a relative or
digital display.
A thin metal strip which burns through
when too much current flows through it,
thereby stopping current flow and
protecting a circuit from damage.
FUEL
FUSIBLE LINK
(for Medium Current Fuse)
(for High Current Fuse or
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.
M
MOTOR
A power unit which converts
electrical energy into mechanical
energy, especially rotary motion.
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LAND CRUISER / LAND CRUISER PRADO (EWD527E)
E
RELAY
Basically, an electrically operated
1. NORMALLYswitch which may be normally
CLOSED closed (1) or open (2).
Current flow through a small coil
creates a magnetic field which either
opens or closes an attached switch.
2. NORMALLY
OPEN
RELAY, DOUBLE THROW
A relay which passes current
through one set of contacts or the
other.
SPEAKER
An electromechanical device which
creates sound waves from current
flow.
SWITCH, MANUAL
Opens
p
and closes
circuits, thereby
1. NORMALLY
stopping (1) or
OPEN
allowing (2) current
flow.
2. NORMALLY
CLOSED
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.
p
RESISTOR, VARIABLE or RHEOSTAT
A controllable resistor with a variable
rate of resistance.
Also called a potentiometer or
rheostat.
(Reed Switch Type)
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.
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.
SOLENOID
An electromagnetic coil which forms
a magnetic field when current flows,
to move a plunger, etc.
WIRES
Wires are always drawn as
(1) NOT
straight lines on wiring
CONNECTED diagrams.
Crossed wires (1) without a
black dot at the junction are
not joined;
crossed wires (2) with a
black dot or octagonal ( )
(2) SPLICED
mark at the junction are
spliced (joined)
connections.
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LAND CRUISER / LAND CRUISER PRADO (EWD527E)