HOW TO DIAGNOSE
TSB Revision
GENERAL <ELECTRICAL>
00E-11
3. Relays may be classified as the normally open-type or the
normally closed-type, depending on their contact
construction.
CHECKING FUSES
M1001005000033
A blade type fuse has test taps provided to allow checking of
the fuse itself without removing it from the fuse block. The fuse
is okay if the test light comes on when its one lead is connected
to the test taps (one at a time) and the other lead is grounded.
Remember to turn the ignition switch to ON to ensure all
circuits are live.
CAUTIONS IN EVENT OF BLOWN FUSE
When a fuse is blown, there are two probable causes. One is
that it is blown due to flow of current exceeding its rating. The
other is that it is blown due to repeated on/off current flowing
through it. Which of the two causes is responsible can be easily
determined by visual check as described below.
1. Fuse blown due to current exceeding rating
The illustration shows the state of a fuse blown due to this
cause. In this case, do not replace the fuse with a new one
hastily since a current heavy enough to blow the fuse has
flowed through it. First, check the circuit for shorts and check
for abnormal electric parts. After correcting shorts or
replacing parts, use only a fuse of the same capacity as a
replacement. Never use a fuse of larger capacity than the
original fuse. If a larger capacity fuse is used, electric parts
or wiring could be damaged.
ACX00949AB
NORMAL OPEN (NO) TYPE
DEENERGIZED STATE ENERGIZED STATE
CURRENT FLOWS
CURRENT DOES
NOT FLOW
ACX00950AB
NORMAL CLOSED (NC) TYPE
DEENERGIZED STATE ENERGIZED STATE
CURRENT FLOWS
CURRENT DOES
NOT FLOW
ACX00951AB
FUSE BLOCK
TEST TAPS
ACX00952 AB
STATE OF FUSE BLOWN DUE TO
OVERCURRENT