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C TROUBLESHOOTING
To Ignition SW VOLTAGE CHECK
IG Terminal
(a) Establish conditions in which voltage is present at the check
point.
Example:
Fuse [A] - Ignition SW on
[B] - Ignition SW and SW 1 on
[A] [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
SW 1 Voltmeter connector or component terminal.
This check can be done with a test light instead of a voltmeter.
[B]
Relay
[C]
SW 2 Solenoid
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.
Ohmmeter When contacting the two leads in reverse, there should be no
continuity.
Diode
(c) Use a volt/ohmmeter with high impedance (10 k/V
minimum) for troubleshooting of the electrical circuit.
Digital Type Analog Type
2002 4RUNNER (EWD471U)
12
C
To Ignition SW FINDING A SHORT CIRCUIT
IG Terminal
(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 Example:
[A] - Ignition SW on
[B] - Ignition SW and SW 1 on
Short [A] [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
SW 1 test light.
The short lies between the connector where the test light
Short [B] stays lit and the connector where the light goes out.
Disconnect (e) Find the exact location of the short by lightly shaking the
Disconnect problem wire along the body.
Light Relay CAUTION:
(a) Do not open the cover or the case of the ECU unless
absolutely necessary. (If the IC terminals are touched,
Short [C] 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
Disconnect clothing comes in contact with the terminals of leads
from the IC, etc. of the replacement part (spare part).
SW 2 Solenoid
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 Pull Up
Press Down Press Down
2002 4RUNNER (EWD471U)
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C TROUBLESHOOTING
Reference: HOW TO REPLACE TERMINAL
(with terminal retainer or secondary locking device)
10 1. PREPARE THE SPECIAL TOOL
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: 3. DISENGAGE THE SECONDARY LOCKING DEVICE OR
Up Tool
(Case 1) 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] For Non-Waterproof Type Connector
Terminal Retainer 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
[Retainer at Full Lock Position] position.
Terminal
Stopper Retainer
[Retainer at Temporary Lock Position]
"Case 2"
Open the secondary locking device.
Example: Secondary
(Case 2) Locking Device
2002 4RUNNER (EWD471U)
14
C
Tool
Tab
Tab
Example: [B] For Waterproof Type Connector
Terminal
(Case 1) Tool
Retainer HINT : Terminal retainer color is different
according to connector body.
Example:
Terminal Retainer : Connector Body
Black or White : Gray
Black or White : Dark Gray
Tool Access Hole
Gray or White : Black
[Male] ( Mark) [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.
HINT : The needle insertion position varies
Retainer according to the connector's shape
at Full Lock Position (Number of terminals etc.), so check
the position before inserting it.
Retainer
at Temporary Lock Position
[Male] [Female]
"Case 2"
Type which cannot be pulled as far as
Example: Terminal Retainer Power Lock insert the tool straight into
(Case 2) the access hole of terminal retainer as
shown.
Tool Tool
Press Down
[Male] Press Down [Female]
2002 4RUNNER (EWD471U)
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C TROUBLESHOOTING
Push the terminal retainer down to the temporary lock position.
Retainer at
Full Lock Position
Retainer at
Temporary Lock Position
[Male] [Female]
Locking Lug (c) Release the locking lug from terminal and pull the terminal out
from rear.
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
2002 4RUNNER (EWD471U)
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