Page 1425 of 2389
![TOYOTA CAMRY V20 1986 Service Information To Ignition SW
IG Terminal
Fuse
Relay
SW2 SolenoidVoltmeter [A]
[B]
[C] SW1
Ohmmeter
SW
INTRODUCTION±HOW TO PERFORM FOR SYSTEM INSPECTION
A±5
6
Wire Harness Repair Manual (RM1022E)
HOW TO PERFORM FO TOYOTA CAMRY V20 1986 Service Information To Ignition SW
IG Terminal
Fuse
Relay
SW2 SolenoidVoltmeter [A]
[B]
[C] SW1
Ohmmeter
SW
INTRODUCTION±HOW TO PERFORM FOR SYSTEM INSPECTION
A±5
6
Wire Harness Repair Manual (RM1022E)
HOW TO PERFORM FO](/manual-img/14/57449/w960_57449-1424.png)
To Ignition SW
IG Terminal
Fuse
Relay
SW2 SolenoidVoltmeter [A]
[B]
[C] SW1
Ohmmeter
SW
INTRODUCTION±HOW TO PERFORM FOR SYSTEM INSPECTION
A±5
6
Wire Harness Repair Manual (RM1022E)
HOW TO PERFORM FOR SYSTEM INSPECTION
This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during
system operation and is based on the assumption of system component trouble
Always inspect the trouble taking the following items into consideration:
Ground point fault
Open or short circuit of the wire harness
Connector or terminal connection fault
Fuse or fusible link fault
NOTICE:
This is an on±vehicle inspection during system operation.
Therefore, inspect the trouble with due regard for safety.
If connecting the battery directly, be careful not to cause a short circuit, and select the applicable
voltage.
1. 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 bulb instead of a voltmeter.
2. 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.
A
Page 1426 of 2389

Diode Ohmmeter
Diode Ohmmeter
Digital Type Analog Type
Bulb Ohmmeter
A±6
INTRODUCTION±HOW TO PERFORM FOR SYSTEM INSPECTION
7
Wire Harness Repair Manual (RM1022E)
If the circuit has diodes, reverse the two leads and check
again.
When touching the negative (±) lead to the diode positive
(+) side and the positive (+) lead to the negative (±) side,
there should be continuity. When touching the two leads in
reverse, there should be no continuity.
HINT: Specifications may vary depending on the type of
tester, so refer to the tester's instruction manual before
performing the inspection.
Check LED (Light Emitting Diode) in the same manner as
that for diodes.
HINT:
Use a tester with a power source of 3V or greater to
overcome the circuit resistance.
If a suitable tester is not available, apply battery
voltage and check that the LED lights up.
(c)Use a volt/ohmmeter with high impedance (10kW/V
minimum) for troubleshooting of the electrical circuit.
3. Bulb Check
(a)Remove the bulb.
(b)There should be continuity between the respective
terminals of the bulb together with a certain amount
of resistance.
(c)Apply the two leads of the ohmmeter to each of the
terminals.
(d)Apply battery voltage and check that the bulb light up.
A
Page 1427 of 2389
![TOYOTA CAMRY V20 1986 Service Information Fuse Case Test Bulb
Short [A]
SW1
Short [B]
Relay
Light
Short [C]
SW2 SolenoidDisconnect
Disconnect DisconnectTo Ignition SW
IG Terminal
INTRODUCTION±HOW TO PERFORM FOR SYSTEM INSPECTION
A±7
8
Wire TOYOTA CAMRY V20 1986 Service Information Fuse Case Test Bulb
Short [A]
SW1
Short [B]
Relay
Light
Short [C]
SW2 SolenoidDisconnect
Disconnect DisconnectTo Ignition SW
IG Terminal
INTRODUCTION±HOW TO PERFORM FOR SYSTEM INSPECTION
A±7
8
Wire](/manual-img/14/57449/w960_57449-1426.png)
Fuse Case Test Bulb
Short [A]
SW1
Short [B]
Relay
Light
Short [C]
SW2 SolenoidDisconnect
Disconnect DisconnectTo Ignition SW
IG Terminal
INTRODUCTION±HOW TO PERFORM FOR SYSTEM INSPECTION
A±7
8
Wire Harness Repair Manual (RM1022E)
4. Finding a Short Circuit
(a)Remove the blown fuse and eliminate all loads from
the fuse.
(b)Connect a test bulb in place of the fuse.
(c)Establish conditions in which the test bulb 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 bulb. The short lies between the
connector where the test bulb stays lit and the
connector where the bulb 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).
A
Page 1428 of 2389

Push
Equal Amperage Rating
A±8
INTRODUCTION±CIRCUIT PROTECTION
9
Wire Harness Repair Manual (RM1022E)
CIRCUIT PROTECTION
All electrical circuits are protected against excessive loads which might occur because of shorts or
overloads in the wiring system. Such protection is provided by a fuse, circuit breaker, or fusible link, A
short circuit may cause a fuse to blow or a circuit breaker to open.
RESET CIRCUIT BREAKER
1. Remove Circuit Breaker
(a)Disconnect the negative (±) cable from the battery.
(b)Remove the circuit breaker.
2. Reset Circuit Breaker
(a)Insert the needle into the reset hole and push it.
(b)Using an ohmmeter, check that there is continuity
between both terminals of the circuit breaker.
If continuity is not as specified, replace the circuit breaker.
HINT: If replacing the circuit breaker, be sure to replace
it with a breaker with an equal amperage rating.
3. Install Circuit Breaker
(a)Install the circuit breaker.
(b)Connect the negative (±) cable to the battery.
HINT: If a circuit breaker continues to cut out, a short
circuit is indicated. Have the system checked by a qualified
technician.
A
Page 1429 of 2389
Equal Amperage Rating
Equal Amperage Rating
Puller
INTRODUCTION±CIRCUIT PROTECTION
A±9
10
Wire Harness Repair Manual (RM1022E)
REPLACEMENT OF FUSE AND FUSIBLE LINK
HINT: If replacing the fuse or fusible link, be sure to
replace it with a fuse or fusible link with an equal amperage
rating.
NOTICE:
1.Turn off all electrical components and the ignition
switch before replacing a fuse or fusible link. Do
not exceed the fuse or fusible link amperage rating.
2.Always use a fuse puller for removing and
inserting a fuse. Remove and insert straight in and
out without twisting. Twisting could force open the
terminals too much, resulting in a bad connection.
If a fuse or fusible link continues to blow, a short circuit is
indicated. The system must be checked by a qualified
technician.
HINT: The puller is located at Junction Block No.2.
A
Page 1430 of 2389
Reference:
(mm)
B±1
TERMINAL AND CONNECTOR REPAIR±PREPARATORY ITEMS
11
Wire Harness Repair Manual (RM1022E)
PREPARATORY ITEMS
Crimping tool AMP Part No. 169060For caulking
press sleeves
ToolSpecial tool Refer to the following illustrationTo remove the
terminal
SST 09991±00500
To remove the
0.64 connector
terminal
GaugeCaliper 0±150 mm
To measure the
diameter of the
core
Others
82999±12010 (Red)
Press sleeve 82999±12020 (Blue)
82999±12030 (Yellow)
To connect wires
Others
Silicon tape 08231±00045
To waterproof
the connected
section
Special Tool
HINT: To remove the terminal from the connector, please
construct and use the special tool or like object shown on
the left.
Preparation of the SST to release the 0.64 connector terminal.
SST 09991±00500
HINT:
This is a SST for releasing terminals from 0.64 connectors.
B
Page 1431 of 2389

TERMINAL AND CONNECTOR REPAIR±CONNECTOR REPAIR
B±2
12
Wire Harness Repair Manual (RM1022E)
CONNECTOR REPAIR
The repair parts now in supply are limited to those connectors having common shapes and terminal
cavity numbers. Therefore, when there is no available replacement connector of the same shape or
terminal cavity number, please use one of the alternative methods described below. Make sure that the
terminals are placed in the original order in the connector cavities, if possible, to aid in future diagnosis.
1. When a connector with a different number of terminals
than the original part is used, select a connector
having more terminal cavities than required, and replace both the male and female connector parts.
EXAMPLE: You need a connector with six terminals, but the only replacement available is a connector
with eight terminal cavities. Replace both the male and female connector parts with the eight terminal part,
transferring the terminals from the old connectors to the new connectors.
2. When several different type terminals
are used in one connector, select an appropriate male and female
connector part for each terminal type used, and replace both male and female connector parts.
EXAMPLE: You need to replace a connector that has two different types of terminals in one connector.
Replace the original connector with two new connectors, one connector for one type of terminal, another
connector for the other type of terminal.
3. When a different shape of connector
is used, first select from available parts a connector with the
appropriate number of terminal cavities, and one that uses terminals of the same size as, or larger than,
the terminal size in the vehicle. The wire lead on the replacement terminal must also
be the same size as,
or larger than, the nominal size of the wire in the vehicle. (ºNominalº size may be found by looking at the
illustrations in the section F or by direct measurement across the diameter of the insulation). Replace all
existing terminals with the new terminals, then insert the terminals into the new connector.
EXAMPLE: You need to replace a connector that is round and has six terminal cavities. The only round
replacement connector has three terminal cavities. You would select a replacement connector that has
six or more terminal cavities and is not round, then select terminals that will fit the new connector. Replace
the existing terminals, then insert them into the new connector and join the connector together.
B
Page 1432 of 2389
B±3
TERMINAL AND CONNECTOR REPAIR±TERMINAL REPLACEMENT
13
Wire Harness Repair Manual (RM1022E)
TERMINAL REPLACEMENT
These steps must be followed when replacing a terminal.
Step 1. Identify the connector and the terminal type.
Step 2. Disconnect the terminal from the connector.
Step 3. Replace the terminal.
Step 4. Install the terminal into the connector.
B