How To Perform For System Inspection; Voltage Check; Continuity And Resistance Check - Toyota Automobile Electrical Repair And Modification

INTRODUCTION–HOW TO PERFORM FOR SYSTEM INSPECTION

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:
D Ground point fault
D Open or short circuit of the wire harness
D Connector or terminal connection fault
D Fuse or fusible link fault
NOTICE:
D This is an on–vehicle inspection during system operation.
Therefore, inspect the trouble with due regard for safety.
D If connecting the battery directly, be careful not to cause a short circuit, and select the applicable
voltage.
To Ignition SW
IG Terminal
Fuse
[A]
SW1
[B]
Relay
[C]
SW2 Solenoid
Ohmmeter
SW
1.

Voltage Check

(a)
Example:
[A] – Ignition SW on
[B] – Ignition SW and SW 1 on
[C] – Ignition SW, SW 1 and Relay on (SW 2 off)
(b)
Voltmeter
2.

Continuity and Resistance Check

(a)
(b)
Wire Harness Repair Manual (RM1022E)
Establish conditions in which voltage is present at the
check point.
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.
Disconnect the battery terminal or wire so there is no
voltage between the check points.
Contact the two leads of an ohmmeter to each of the
check points.
A–5
A
9