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C TROUBLESHOOTING
(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 point.
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.
(c) Use the volt/ohmmeter with high impedance (10 kW/V
minimum) for troubleshooting of the electrical circuit.
CONTINUITY AND RESISTANCE CHECK 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 (SW2 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.
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11
C
(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.
(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).
CAUTION: FINDING A SHORT CIRCUIT
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.
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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 1º
Raise the terminal retainer up to the temporary
lock position.
Case 2º
Open the secondary locking device.
Page 1012 of 1807
13
C
For Waterproof Type Connector
HINT: Terminal retainer color is different
according to connector body.
Case 1º
Type where terminal retainer is
pulled up to the temporary lock
position (Pull Type).
Insert the special tool into the
terminal retainer access hole (Mark)
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 2º
Type which cannot be pulled as far as
Power Lock insert the tool straight
into the access hole of terminal
retainer as shown.B
Example:
Terminal Retainer
:Connector Body
Black or White :Gray
Black or White :Dark Gray
Gray or White :Black
Page 1013 of 1807
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C TROUBLESHOOTING
(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.
(c) Release the locking lug from terminal and pull the
terminal out from rear.
4. INSTALL TERMINAL TO CONNECTOR
5. CONNECT CONNECTORPush the terminal retainer down to the temporary lock
position.
(b) Push the secondary locking device or terminal retainer
into the full lock position.
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C TROUBLESHOOTING
DISCONNECTION AND CONNECTION OF BOLT
TYPE CONNECTORS
For engine control module in this vehicle, connections are used
which require a bolt built into the connector to be screwed down
to securely connect the connector.
1. Disconnect the connector
After completely loosening the bolt, the two parts of the
connector can be separated.
NOTICE:
Do not pull the wire harness when disconnecting the
connector.
2. Connect the connector
NOTICE:
Before connecting the connector, always check that
the terminals are not bent or damaged.
(a) Match the guide section of the male connector
correctly with the female connector, then press
them together.
(b) Tighten the bolt.
Make sure the connectors are completely
connected, by tightening the bolt until there is a
clearance of less than 1 mm (0.04 in.) between the
bottom of male connector and the end of female
connector.
Page 1015 of 1807
16
ABBREVIATIONS D
ABBREVIATIONS
The follow abbreviations are used in this manual.
ABS = Anti-Lock Brake Systerm O/D = Overdrive
A/C = Air Conditioning PPS = Progressive Power Steering
ACIS = Acoustic Control Induction System R/B = Relay Block
A/T = Automatic Transmission RH = Right-Hand
COMB. = Combination SFI = Sequential Multiport Fuel Injection
ECU. = Electronic Control Unit SRS = Supplemental Restraint System
EGR = Exhaust Gas Recirculation SW = Switch
ESA = Electronic Spark Advance TEMP. = Temperature
EVAP = Evaporative Emission TRAC = Traction Control
J/B = Junction Block VSV = Vacuum Switching Valve
LH = Left-Hand w/ = With
M/T = Manual Transmission w/o = Without
* The titles given inside the components are the names of the terminals (terminal codes) and are not treated
as being abbreviations.
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17
E GLOSSARY OF TERMS AND SYMBOLS
METER, ANALOG
Current flow activates a magnetic
coil which causes a needle to
move, thereby providing a relative
display against a background
calibration. LED (LIGHT EMITTING DIODE)
Upon current flow, these diodes
emit light without producing the
heat of a comparable light. IGNITION COIL
Convert low-voltage DC current
into high-voltage ingition current
for firing the spark plugs.
1. SINGLE
FILAMENT
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.
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. 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.
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.
DIODE
A semiconductor which allows
current flow in only one direction.
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.
PHOTODIODE
The photodiode is a
semiconductor which controls the
current flow according to the
amount of light.
FUSE
A thin metal strip which burns
through when too much current
flows through it, thereby stop-
ping 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 cross-
section surface area of the wires.HORN
An electric device which sounds a
loud audible signal.
LIGHT
Current flow through a filament
causes the filament to heat up
and emit light.
METER, DIGITAL
Current flow activates one or
many LED's, LCD's, or fluoresent
displays, which provide a relative
or digital display.
MOTOR
A power unit which converts
electrical energy into mechanical
energy, especially rotary motion. CIGARETTE LIGHTER
An electric resistance heating
element.
DISTRIBUTOR, IIA
Channels high-voltage current
from the ignition coil to the
individual spark plugs.
2. DOUBLE
FILAMENT
HEADLIGHTS
FUEL
M
(for High Current Fuse or
Fusible Link.)
(for Medium Current Fuse)