1994 MITSUBISHI 3000GT Workshop Manual

Downloaded from www.Manualslib.com manuals search engine GENERAL - Centralized Junction
CENTRALIZED RELAY
i
L
ClassificationRelay box in
A-01X
engine
compart-
mentA-02X
A-03X
A-04XNameClassification
Headlight relayAir condition- A-31X
ing relay boxinengineABS power relay (vehicles compart-A-32X
produced up to Oct. 1993)
ment
Fog light relayA-33X
Radiator fan motor relay (LO)A-34XNameCondenser fan motor relay
(HI)Radiator fan motor control
relay (Up to 1993 models)
Magnetic clutch relayCondenser fan motor relay
(LO)
A-05X
A-06X
A-07XTaillight relayInterior relay C-04X
Door lock power relay 1box
Horn relayc-05-xDefogger relay (1994 models)
Radiator fan motor relay (HI)C-06XDefogger relay (Up to 1993
models, From 1995 models)
A-08X
A-09X
A-l OX
A-11XPop-up motor relay (Up to
1993 models)
Starter relay
Generator relay
IOD or Storage connector
c-07xPower window relay
NOTEIOD: Ignition Off Draw
in engine compartment>
Y16FO256

Up t;-;t;3 modelsFrom 1994 modelsc-05xc-04x c-05x
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Downloaded from www.Manualslib.com manuals search engine 24GENERAL - Harness Connector Inspection
ess connector
contact pressure
checking harness
201 R057
Z16R1317
HARNESS CONNECTOR INSPECTION
CONNECTOR CONTINUITY AND VOLTAGE TESTWhen checking continuity and/or voltage at the waterproof
connectors, follow the steps below to avoid poor connector
contact and/or reduced waterproof performance of connectors.
(1) When checking is performed with the circuit in the stateof continuity, be sure to use the special tool (harness
connector).
Never insert a test bar from the harness side, because
to do so will reduce the waterproof performance and result
in corrosion.
(2) When the connector
JS disconnected for checking the fe-
male pin, the harness for checking the contact pressureof connector pins should be used.
Never force the insertion of a test bar, because to do
so will cause poor contact.(3) When the male pin is to be checked, apply the test bar
against the pin directly.
Care must be taken not to short-circuit the connector pins.
TERMINAL ENGAGEMENT CHECK
When the terminal stopper of connector is out of order, engage-
ment of male and female terminals becomes improper even
when the connector itself is engaged perfectly and the terminal
sometimes slips out to the rear side of connector. Ascertain,
therefore, that each terminal does not come off the connector
by pulling each harness wire.
CONNECTOR TERMINAL ENGAGEMENT AND
DISENGAGEMENTConnectors which are loose shall be rectified by removing
the female terminal from connector housing and raising its
lance to establish a more secure engagement. Removal of
connector terminal used for MFI and 4 A/l control circuit shallbe done in the following manner.
COMPUTER CONNECTOR(1) Insert screwdriver
[1.4 mm (.06 in.) width] as shown in
the figure, disengage front holder and remove it.
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Downloaded from www.Manualslib.com manuals search engine GENERAL - Harness Connector Inspection25 ~
Z16R1320
(2)Insert harness of terminal to be rectified deep into connec-tor from harness side and hold it there.
Housing lance/
’ Needle
’ Housing lance
Z16R132
(3)Insert tip of screwdriver [1.4 mm (.06 in.) width] into connec-tor in a manner as shown in the figure, raise housing
lance slightly with it and pull out harness.
CautionTool No. 753787-l supplied by AMP can be used
instead of screwdriver.(4)
insert needle through a hole provided on terminal and
raise contact point of male terminal.
ROUND WATERPROOF CONNECTOR
(1) Remove waterproof cap by using a screwdriver.
(2) Insert tip of screwdriver
[I.4 mm (.06 in.) or 2.0 mm (.08in.) width] into connector in a manner as shown in the
figure, raise housing lance slightly with it and pull out
harness.(3) Insert screwdriver through a hole provided on terminal
and raise contact point of male terminal.
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Downloaded from www.Manualslib.com manuals search engine 26GENERAL - Harness Connector Inspection
Front holder
\\Z16R1325]
Housing lance7,fiEL,
c
Terminal lance00000400\
RECTANGULAR WATERPROOF CONNECTOR
(1)Disengage front holder by using a screwdriver and remove
it.
(2) Inset-t tip of screwdriver [*0.8 mm (.03 in.) width] into con-
nector in a manner as shown in the figure, push it lightly
to raise housing lance and pull out harness.
*If right size screwdriver is not available, convert a conven-
tional driver to suit the size.
(3) Press contact point of male terminal down by holding a
screwdriver [1.4 mm (.06 in.) width] in a manner as shown
in the figure.
INJECTOR CONNECTOR
(1) Remove waterproof cap.
(2)Insert tip of screwdriver [1.4 mm (.06 in.) width] into connec-
tor in a manner as shown in the figure, press in terminal
lance and pull out harness.
(3) Press contact point of male terminal down by holding a
screwdriver [1.4 mm (.06 in.) width] in a manner as shown
in the figure.
CautionMake sure that lance is in proper condition before
terminal is inserted into connector.
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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.
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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.
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Downloaded from www.Manualslib.com manuals search engine GENERAL - How to Diagnose293. Jumper wire
A jumper wire is used to close an open circuit. Never
use one to connect a power supply directly to a load.
Z16602274. 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) probeto the body ground.
5. Ohmmeter
An ohmmeter is used to check continuity or measure resis-
tance of a switch or coil. If the measuring range has been
changed, the zero point must be adjusted before measure-
ment.
CHECKING SWITCHES
In a circuit diagram, a switch is represented by a symbol andin the idle state.
1. Normal open or normal close switch
Switches are classified into those which make the circuit
open and those which make the circuit closed when off.
INormal open (NO) typeIOFF
/4-
1X
t
Current does not flow
16X0690
ON
1
a
ia
Current flows
16X0691
00000401
Normal close (NC) type
i===ONOFF
1
/4-
1X
Current does not flow16X0690
00000402
a
III
Current flows
16X0691
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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.
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