1989-Mitsu-Factory Manual · wiring diag · страница 5 из 91 · Открыть оригинал PDF ↗
When a normal close type relay as illustrated here is
checked, there should be continuity between terminals
(I) and (2) and between terminals 3 and 4 when the relay
is deenergized, and the continuity should be lost between
terminals 3 and 4 when the battery voltage is applied to
the terminals 1 and 2. A relay can be checked in this
manner and it cannot be determined if a relay is okay or
faulty by checking its state only when it is deenergized
(or energized).
CHECKING FUSES
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.
(Change the ignition switch position adequately so that the
fuse circuit becomes live.)
CAUTIONS IN EVENT OF BLOWN FUSE
When a fuse is blown, there are two probable causes as
follows: 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.
(I) Fuse blown due to current exceeding rating
The illustration shown 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
shorting and check for abnormal electric parts. Only after
the correction of such shorting or parts, fuse of the same
capacity should be used as a replacement. Never use a
fuse of lager capacity than the one that has blown. If
such a fuse is used, electric parts or wirings could be
damaged before the fuse blows in the event an overcur-
rent occurs again.
(2) Fuse blown due to repeated current on/off
The illustration shown the state of a fuse blown due to
repeated current on/off. Normally, this type. of problem
occurs after fairly long period of use and hence is less
frequent than the above type. In this case, you may
simply replace with a new fuse of the same capacity.
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