Mitsubishi Montero 1987 Manuel de service télécharger pdf (Page 37)

Normal close INC) type

Deenergized state

Energized state

WIRING HARNESS - Troubleshooting

8-17

When a normal close type relay as illustrated here is checked,

there should be continuity between terminals (1) 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 deter-

mine if a relay is okay or faulty by checking its state only when

it is deenergized (or energized).

Current -flows

Current does not flow

1680234

1680235

State of fuse blown due to overcurrent

1660237

State of fuse blown due to thermal fatigue

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 beomes 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.

(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 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 overcurrent occurs again.

(2) Fuse blown due to repeated current on/off

The illustration shows the state of a fuse blown due to re-

peated 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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Mitsubishi Montero 1987 Manuel de service Page 37

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