Mitsubishi Eclipse. Manual — part 734
HOW TO DIAGNOSE
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GENERAL <ELECTRICAL>
00E-9
CHECKING SWITCHES
M1001004800047
In a circuit diagram, a switch is shown in the idle state.
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.
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
CONNECTION
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
ACX00944AB
CURRENT
FLOWS
CURRENT DOES
NOT FLOW
CURRENT DOES
NOT FLOW
CURRENT FLOWS
OFF
OFF
ON
ON
NORMALLY OPEN (NO) TYPE
NORMALLY CLOSED (NC) TYPE
ACX00945 AB
6
OFF
5
4
3
2
1
1ST 2ND 3RD 4TH STAGE
HOW TO DIAGNOSE
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GENERAL <ELECTRICAL>
00E-10
CHECKING RELAYS
M1001004900044
NOTE: The deenergized state means that no current is flowing
through the coil. The energized state means that current is
flowing through the coil.
When a normally closed 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.
There should be no continuity between terminals 3 and 4 when
battery voltage and ground are applied to terminals 1 and 2.
1. 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).
2. 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.
ACX00946AB
4
3
2
1
4
3
2
1
NORMALLY CLOSED (NC) TYPE
DEENERGIZED STATE ENERGIZED STATE
CURRENT FLOWS
CURRENT DOES
NOT FLOW
ACX00947AB
COVER
SPRING
IRON
CORE
COIL
IRON
PIECE
CONTACT
ACX00948 AB
POWER SUPPLY
FUSE
LIGHT
RELAY
SWITCH
ON
OFF
ON
OFF
HOW TO DIAGNOSE
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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
M1001005000044
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 cir-
cuits 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, or could start a fire.
ACX00949AB
NORMALLY OPEN (NO) TYPE
DEENERGIZED STATE ENERGIZED STATE
CURRENT FLOWS
CURRENT DOES
NOT FLOW
ACX00950 AB
NORMALLY 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
HOW TO DIAGNOSE
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GENERAL <ELECTRICAL>
00E-12
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.
CABLES AND WIRES CHECK
M1001005100041
1. Check connections for looseness, rust, and stains.
2. Check terminals and wires for corrosion by battery
electrolyte, etc.
3. Check terminals and wires for open circuit or impending
open circuit.
4. Check wire insulation and coating for damage, cracks, and
wear.
5. Check conductive parts of terminals for contact with other
metallic parts (vehicle body and other parts).
6. Check grounding parts to verify that there is complete
continuity between attaching bolt(s) and vehicle body.
7. Check for incorrect wiring.
8. Check that harnesses are secured to prevent contact with
sharp edges and corners or hot parts (exhaust manifold,
pipe, etc.).
9. Check that harnesses are secured firmly to provide enough
clearance from the fan pulley, fan belt, and other rotating or
moving parts.
10.Check that the harness between fixed parts (such as the
vehicle body) and vibrating parts (such as the engine) are
long enough to allow for vibration and movement.
BATTERY HANDLING
M1001005200048
WARNING
Battery posts, terminals and related accessories con-
tain lead and lead compounds. WASH HANDS AFTER
HANDLING.
When checking or servicing does not require power from the
vehicle battery, be sure to disconnect the cable from the battery
(
−) terminal. This will prevent problems that could be caused by
a short circuit. Disconnect the (
−) battery terminal first and
reconnect it last.
ACX00953 AB
STATE OF FUSE BLOWN DUE TO
THERMAL FATIGUE
ACX00954 AB
ACX00955 AB
AC000017
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