1993 MITSUBISHI 3000GT relay

Downloaded from www.Manualslib.com manuals search engine GENERAL - How to Diagnose27
HOW TO DIAGNOSE
L;The most important point in troubleshooting is to determine “Probable Causes”. Once the probable causes
are determined, parts to be checked can be limited to those associated with such probable causes. Thereforeunnecessary checks can be eliminated. The determination of the probable causes must be based
ona theory and be supported by facts and must not be based on intuition only.
TROUBLESHOOTING STEPSIf an attempt is made to solve a problem without going through correct steps for troubleshooting, the
problem symptoms could become more complicated, resulting in failure to determine the causes correctly
and making incorrect repairs. The four steps below should be followed in troubleshooting.
I i
,;zirvation of Problem Symp-Determination of Probable
CausesI
Observe the symptom carefully.
Check if there are also other problems.
In determining the probable causes, it is necessary to check
the wiring diagram to understand the circuit as a system.
Knowledge of switches, relays and other parts is necessary
for accurate determination. The causes of similar problems
in the past must be taken into account.
After the problems are corrected, be sure to check that
the system operates correctly. Also, check that new prob-
lems have not been caused by the repair.
INFORMATION FOR DIAGNOSIS
Troubleshooting is carriedout by making step by step
is found. Always go through
what check is to be made where
/
b
This manual contains the cable diagrams as well as the individual circuit drawings, operational explanations,
and troubleshooting hints for each component required to facilitate the task of troubleshooting. The information
is compiled in the following manner:
(1) Cable diagrams show the connector positions, etc., on the actual vehicle as well as the harness path.(2) Circuit drawings show the configuration of the circuit with all switches in their normal positions.
(3) Operational explanations include. circuit drawings of voltage flow when the switch is operated and
how the component operates in reaction.
(4) Troubleshooting hints include numerous examples of problems which might occur, traced backwardin a common-sense manner to the origin of the trouble.
Problems whose origins may not be found in this manner are pursued through the various system
circuits.
NOTE
Components of MFI, ETACS, ECS, etc. with ECU do not include 3 and 4 above. For this information,
refer to a manual which includes details of these components.
TSB Revision

Downloaded from www.Manualslib.com manuals search engine GENERAL - How to Diagnose
Changeover k&bZ1680224
Z1680225
INSPECTION1. Visual and aural checks
Check relay operation, blower motor rotation, light illumina-d
tion, etc. visually or aurally. The flow of current is invisiblebut can be checked by the operation of the parts.
2. Simple checks
For example, if a headlight does not come on and a faultyfuse or poor grounding is suspected, replace the fuse
with a new one or ground the light to the body by a jumper
wire to determine which part is responsible for the problem.3. Checking with instruments
Use an appropriate instrument in an adequate range andread the indication correctly. You must have sufficient
knowledge and experience to handle instruments correctly.
INSPECTION INSTRUMENTS
In inspection, make use of the following instruments.1. Test lights
A test light consists of a 12 V bulb and lead wires. It
is used to check voltages or short circuits.
2. Self-power test light
A self-power test light consists of a bulb, battery and lead
wires connected in series. It is used to check continuity
or grounding.
TSB Revision

Downloaded from www.Manualslib.com manuals search engine 30GENERAL - How to Diagnose
5432
1
18AO253
10W80800000403
Coil
Iron
Cover
Spring
Iron
core
- ContZt
21680231
(NO) type
Energized state1Normal op6
Deenergized state
--
nKilX
Current does not flow
lSXO804
!
Current flows10x0095000004042. SWITCH CONNECTION
This figure illustrates a complex switch. The continuity
between terminals at each position is as indicated in the
table below.4th stage
CHECKING RELAYS1. 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 is made to return 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 of small capacity. 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 flowingat this time to the switch is the relay coil current only
and is very small.3. The relays may be classified into the normal open type
and the normal close type by their contact construction.
NOTE
The deenergized state means that no current is flowing
through the coil and the energized state means that current
is flowing through the coil.
JI
TSB Revision

Downloaded from www.Manualslib.com manuals search engine iGENERAL
- How to Diagnose31
Normal close (NC) type
Deenergized stateEnergized state
Current does not flow
Z1680235
State of fuse blown due to overcurrent
/
L
I21680237
State of fuse blown due to thermal fatigue
Z1660236When 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 betweenterminals 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 FUSESA blade type fuse has test taps provided to allow checking
of the fuse itself without removing it from the fuse block. Thefuse 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 adequatelyso 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.(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 larger 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
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 simplyreplace with a new fuse of the same capacity.
1 TSB Revision

Downloaded from www.Manualslib.com manuals search engine L
iGENERAL
- How to Diagnose33
Power supply
Fuse
’ i
ON (2),----c//ISwitch
I
Motor
Z16AO260
GENERAL ELECTRICAL SYSTEM CHECKSA circuit consists of the power supply, switch, relay, load
ground, etc. There are various methods to check a
circui;
including an overall check, voltage check, short circuit checkand continuity check. Each of these methods is briefly de-
scribed in the following.
1. VOLTAGE CHECK
(1) Ground one lead wire of the test light. If a voltmeter
is used instead of the test light, ground the groundingside lead wire.
(2) Connect the other lead wire of the test light to the
power side terminal of the switch connector. The test
light should come on or the voltmeter should indicate
a voltage.
(3) Then, connect the test light or voltmeter to the motor
connector. The test light should not come on, or the
voltmeter should indicate no voltage. When the switch
is turned on in this state, the test light should come
on, or the voltmeter should indicate a voltage, with
motor starting to run.(4) The circuit illustrated here is normal but if there is
any problem such as the motor failing to run, check
voltages beginning at the connector nearest to themotor until the faulty part is identified.
TSB Revision

Downloaded from www.Manualslib.com manuals search engine CONFIGURATION DIAGRAMS - How to Read Configuration Diagram37
,lHOW TO READ CONFIGURATION DIAGRAM
id actual vehicles.
L
Denotes connector No.The same connector No. is used throughout the circuit dia-
grams to facilitate connector location searches. The first al-
phabetical symbol indicates the location site of the connector
and a number that follows in the unique number. Numbers areassigned to parts in clockwise order on the diagram.
Examole: A-l 2
/Number specific to connector (serial number)
Connector location site symbol
A: Engine compartment
B: Engine and transaxle
C: Dash panel
D: Instrument panel and floor consoleE: Interior
F: Luggage compartment
Denotes ground point.Same ground number is used throughout cir-cuit diagrams to facilitate search of ground
point. Refer to P.4 for details of ground points.
A-01X
A-02X
A-03X
A-04X
A-05X
A-06X
A-07X
A-08X
A-09X
A AL\,
$~~~;~.--.-.*/hhA, ”
L^---,.-I II-m 1 lta>.I
J
n-1°KA-11X
\
LI
ueriotes a sermon covereaby a corrugated tube.236F0122
A-01X Headlight relayA-18A-02X ABS power relayA-l 9ignition timing adjustment connector
Front washer motorA-03X Fog light relayA-20
A-04XRadiator fan motor relay(L0)A-21Evaporative emission purge solenoid
EGR solenoidA-05X Taillight relay
A-06X Horn relay
A-22(Vehicles for California)
A-07X Radiator fan motor relay (HI)EGR temperature sensor
A-09X Starter relayA-23(Vehicles for California)
No connection A-l OX Generator relayA-24Brake fluid level sensorA-11XIOD or Storage connectorA-25
A-12ABS front speed sensor (RH)A-26ECS front shock absorber (LH)
Theft-alarm horn
A-13Theft-alarm horn
A-14ECS front shock absorber (RH)A-27
Washer fluid level sensorA-28
Auto-cruise vacuum pump
TSB Revision

Downloaded from www.Manualslib.com manuals search engine 38CONFIGURATION DIAGRAMS - Engine Compartment
ENGINE COMPARTMENT
(UP TO 1993 MODELS)
Connector
symbol
A
01xthru
34X

A-20A-21
A-22
A-01X
A-02X
A-03X
A-04X
A-05X
A-06X
A-07X
A-08X
A-09XHeadlight relayABS power relay
Fog light relay
Radiator fan motor relay (LO)
Taillight relay
Horn relay
Radiator fan motor relay (HI)
Pop-up motor relayStarter
relavA-12 A-13A-14 A-15 A-16A:174-18
A-79 q-20 A:21 4-22
A-10X
A-11X
A-12
A-13
A-14
A-l 5
A-16
A-17
A-18Generator relayIOD or Storage connector
ABS front speed sensor (RH)
ECS front shock absorber (RH)
Washer fluid level sensor
Front wiper motor
Engine speed detection connector
Fuel pump check connector
Ignition timing adjustment connector
1 TSB RevisionI

Downloaded from www.Manualslib.com manuals search engine A-23A-24 A-25A-26
A-27
CONFIGURATION DIAGRAMS - Engine Compartment39
sJ=+?6Foo1300004251
A-l 9
A-20
A-21
A-22A-23
A-24
A-25
A-26
Front washer motor
Evaporative emission purge solenoid
EGR solenoid (Vehicles for California)
EGR temperature sensor
(Vehicles for California)
No connection
Brake fluid level sensor
ECS front shock absorber (LH)
Theft-alarm horn
piFE&l
A-27
A-26
A-29
A-30
A-31X
A-32X
A-33X
A-34X
Theft-alarm horn
Auto-cruise vacuum pump
ABS front speed sensor (LH)4WS fluid level sensor

Condenser fan motor relay (HI)
Radiator fan motor control relay
Magnetic clutch relay
Condenser fan motor relay (LO)