Mitsubishi Outlander XL. Manual — part 74

ZC600182AA00

2.

Self-powered test light
A self-powered test light consists of a bulb, battery and lead
wires connected in series. It is used to check continuity or
grounding.

ZC600183AA00

Never use a jumper wire to connect a power supply directly
to a load.

3.

Jumper wire
A jumper wire is used to close an open circuit.

ZC6001840000

Red lead wire

Power line

Black lead wire

Ground

4.

Voltmeter
A voltmeter is used to measure the circuit voltage. Normally,
the positive (red lead) probe is applied to the point of voltage
measurement and the negative (black lead) probe to the body
ground. Use a digital voltmeter to check for voltage drop
before or after a component.

ZC600185AA00

5.

Ohmmeter
An ohmmeter is used to check continuity or measure
resistance of a switch or coil. If the measuring range has been
changed, the zero point must be adjusted before
measurement.

CHECKING FUSES

M10009300007USA0000010000

GENERAL <ELECTRICAL>

00E-9

HOW TO DIAGNOSE

ZC600186

Fuse block

0000

Test taps

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.

ZC6001870000

State of fuse blown due to overcurrent

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, or could start a fire.

ZC6001880000

State of fuse blown due to thermal fatigue

2.

Fuse blown due to repeated turning current on and off
The illustration shows the state of a fuse blown due to
repeated current on/off. Normally, this type of problem occurs
after a fairly long period of use and is less frequent than above.
In this case, simply replace with a new fuse of the same
capacity.

CHECKING SWITCHES

M10009300008USA0000010000

In a circuit diagram, a switch is shown in the idle state.

00E-10

GENERAL <ELECTRICAL>

HOW TO DIAGNOSE

ZC6001890000

Current flows

Current does not flow

Current does not flow

Current flows

OFF

OFF

ON

ON

Normally open (NO) type

Normally closed (NC) type

1.

Normally open or normally closed switch
Switches are classified into those which open the circuit and
those which close the circuit when off.
Switches are shown in their normal state unless specified
otherwise.

ZC6001900000

6

OFF

5

4

3

2

1

1st

2nd 3rd

4th stage

2.

Switch connection
This figure illustrates a complex switch. The continuity
between terminals at each position is as indicated in the table
below.

Switch position

Tester
connection

Specified
condition

OFF

-

-

1st stage

1-5-6

Continuity

2nd stage

1-4-6

Continuity

3rd stage

1-3-6

Continuity

4th stage

1-2-6

Continuity

GENERAL <ELECTRICAL>

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HOW TO DIAGNOSE

CHECKING RELAYS

M10009300009USA0000010000

ZC6001910000

Power supply

Fuse

Light

Relay

Switch
ON

OFF

ON

OFF

1.

By using a relay, a heavy current can be turned on and off by
a switch using much less current. For example, in the circuit
shown here, when the switch is turned on (closed), current
flows to the coil of the relay. Then, its contact is turned on
(closed) and the light comes on. The current flowing through
the switch is much less than that for the light.

ZC6001920000

Cover

Spring

Iron core

Coil

Iron
piece

Contact

Normally open (NO) type

Energi zed stat e

2.

When current flows through the coil of a relay, its core is
magnetized to attract the iron piece, closing (ON) the contact
at the tip of the iron piece. When the coil current is turned off,
the iron piece returns to its original position by a spring,
opening the contact (OFF).

ZC6001930000

Normally open (NO) type

Deenergi zed stat e

Energi zed stat e

Current flows

Current does not flow

4

3

2

1

4

3

2

1

ZC600194 0000

4

3

2

1

4

3

2

1

Normally closed (NC) type

Deenergi zed stat e

Energi zed stat e

Current flows

Current does not flow

3.

Relays may be classified as the normally open-type or the
normally closed-type, depending on their contact construction.

NOTE:

The deenergized state means that no current is

flowing through the coil. The energized state means that
current is flowing through the coil.

(1)

The normally open-type
When a normally open relay as illustrated here is checked,
there should be no continuity between terminals 3 and 4
when the relay is deenergized. There should be continuity
between terminals 3 and 4 when battery voltage and
ground are applied to terminals 1 and 2. The relay condition
is determined by this check.

NOTE:

Check the relay in both situation which is

energized and is not energized.

(2)

The normally closed-type
When a normally closed relay as illustrated here is
checked, there should be continuity between terminals 3
and 4 when the relay is deenergized. There should be no
continuity between terminals 3 and 4 when battery voltage
and ground are applied to terminals 1 and 2. The relay
condition is determined by this check.

NOTE:

Check the relay in both situation which is

energized and is not energized.

00E-12

GENERAL <ELECTRICAL>

HOW TO DIAGNOSE