fuse MITSUBISHI 3000GT 1991 Service Manual

13-12FUEL SYSTEM - Troubleshooting
MALFUNCTION INDICATOR LIGHT INSPECTION
(1) Check that when the ignition switch is turned on, the lightilluminates for about 5 seconds and then goes out.
(2) If the light does not illuminate, check for open circuit in
dharness, blown fuse and blown bulb.
SELF-DIAGNOSIS
The engine control unit monitors the input/output signals (some
signals at all times and the others under specified conditions) ofthe engine control unit.
When it is noticed that an irregularity has continued for a
specified time or longer from when the irregular signal is
initially monitored, passing a certain number, the engine controlunit judges that an irregularity has occurred, memorizes the
malfunction code, and outputs the signal to the self-diagnosis
output terminal.
There are 21 diagnosis items, including the normal state, andthe diagnosis results can be read out with a voltmeter or
multi-use tester.Moreover, since memorization of the malfunction codes is
backed up directly by the battery, the diagnosis results are
memorized even if the ignition key is turned off. The malfunc-
tion codes will, however, be erased when the battery terminalor the engine control unit connector is disconnected.
The malfunction code can also be erased by turning on the
ignition switch and sending the malfunction code erase signalfrom the multi-use tester to the engine control unit.
CautionIf the sensor connector is disconnected with the ignition
_ _switch turned on, the malfunction code is memorized. Ind
this case, send the malfunction code erase signal from themulti-use tester to the engine control unit or disconnect
the battery terminal
(-) for 10 seconds or more, and the
diagnosis memory will be erased.
The 21 diagnosis items are provided as follows, and if plural
items are activated, they are all indicated sequentially from the
smallest code number.
CautionThe malfunction code for the ignition timing adjustment
signal is output when the line of the ignition timing
adjustment terminal is shorted to ground. Therefore, the
malfunction code is also output when the ignition timing
adjustment terminal is grounded to adjust the ignition
timing, but this does not show any abnormality.
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13-22FUEL SYSTEM - Troubleshooting
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13-28FUEL SYSTEM - Troubleshooting
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I

13-164CRUISE CONTROL SYSTEM - Troubleshooting
2Inspection of control switch circuit
IGNITIONSWITCHtACC)
*X35-AK-R1302r-
._--------
LE- @CONTROL UNIT
TROUBLESHOOTING HINTSECU terminal voltage
DESCRIPTION OF OPERATIONdThe control switch is a switch in which the SET,
RESUME and CANCEL switches are integrated.
Therefore, different resistance values are used for
the individual switches to change the outputs
(voltages) to the control unit. Current flows through
fuse No. @ of J/B and through the control switch to
the control unit.
1. SET switchWhen the cruise control switch is ON, if the SET
switch is set to ON while vehicle speed is within
a range from about 40 to 145 km/h (25 to 90
mph), the vehicle starts cruising at the speed. If
the SET switch is kept at ON during cruise
operation, the vehicle coasts, and starts cruising
at the speed reached when the SET switch is
set to OFF.
2. RESUME switch
Even if cruise operation is canceled, the vehicle
resumes cruising at the speed set before the
cancellation. Both when the main switch is set
to OFF and when the vehicle speed is reduced
to less than 40 km/h (25 mph) , the vehicle will
not resume cruising at the previously set speed
even if the RESUME switch is set to ON. If the
RESUME switch is kept at ON during cruise
LJoperation, the engine accelerates, and the vehi-
cle starts cruising at the speed reached when
the RESUME switch was set to OFF. (However,
when the vehicle speed is raised to more than
145 km/h (90 mph), the vehicle cruises at
approximately 145 km/h {90 mph).
3. CANCEL switch
When the CANCEL switch is set to ON during
cruise operation, the cancel signal is input to the
control unit which internally interrupts the power
supply to the vacuum pump assembly for
cancellation of cruise operation.
18Control switchSignal name
L
Condition
I
Terminalvoltage1
When all switches are OFFIov1
When SET switch is ONI3vI
When RESUME switch is ON
When CANCEL switch is ON6Vd
Systemvoltage
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14-6COOLING - Troubleshooting.TROUBLESHOOTING HINTS
1. Neither the radiator fan nor condenser fan
rotate at all.
l Check fusible link No. 5.
2. Only the condenser fan does not operate.
l Check dedicated fuse No. 8.
3. The radiator fan and condenser fan do not
operate in the low speed mode, but operate
otherwise.
(1) The A/C compressor magnet clutch does not
enter the “ON” state.
l Check whether the output of the auto
compressor control unit is available.
NOTEFor troubleshooting of the air conditioner
control unit, refer to GROUP 55.
(2) The A/C compressor magnet clutch enters
the “ON” state.
l Check the resistor.
Fan Operating Model Check the radiator fan motor relay (LO)
and condenser fan motor relay (LO).
l Check the therm0 sensor (for radiator
fan).
(3) The radiator fan does not rotate when the ailconditioner switch is turned ON.
l Check the radiator fan motor control
relay.4. The radiator fan and condenser fan do not
operate in the high speed mode, but operate
otherwise.l Check the therm0 sensor (for condenser
fan).
lCheck the radiator fan motor relay (HI) and
condenser fan motor relay (HI).Air
conditionerswitch
Switch conditionsTherm0 sensor
For radiator fan
For condenser fan
ON at 85
k 4°C
ON at 95 t 4°C
(185 f 7°F) or more(203 + 7°F) or more
OFF at 77°C (171°F)
OFF at 87°C (189°F)or less
or lessEngine coolant
temperature switch
(for air conditioner
cut-off) OFF at 115
+3°C (239 2 5°F) or
over, ON at 108°C
(226°F) or lessFan revolving operation
conditionCondenser fan motor
Condenser fan motorRadiator fan motor
operates
In HIGH only
when it receives input
from condenser fan
motor relay (HI) and
U-0).I/I/
OFF
OFF
OFFOFF
IOFFIOFF
ONLOWOFF
ON
HIGHLOW
OFF
OFFLOWLOW
OFF
ONON
LOWLOW
ON
HIGH
ONHIGH
OFF
HIGHLOW
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15-4INTAKE AND EXHAUST -Troubleshooting (Active Exhaust System)
TROUBLESHOOTING (ACTIVE EXHAUST SYSTEM)MlSEBAA
TROUBLESHOOTING PROCEDURE(1) Make sure that the valve operating cable is not dislocated.
(2) Make sure that the connectors of each component are positively connected and that no fuse has blown.
(3) Have an overall understanding of the substance and procedure of checking by reference to the
Troubleshooting Quick-Reference Table and perform check in the proper sequence.
(4) Check each component with its connectors disconnected.
TROUBLESHOOTING QUICK-REFERENCE TABLEIf no abnormality is found in all parts by the check performed in the following sequence, the problem is
probably caused by faulty active exhaust control unit and therefore the active exhaust control unit is replaced.
Se-Part to becheckedCheckingprocedureJudgement
Probable causeluenceRemedy
Normal
Abnormal
1ValveOperate valve
manually.Operates freely.Does not operate.Valve stickingReplace mainmuffler.
2ActiveRefer to P.15-34.exhaustFaulty switchReplace switch.
switch
3PowerwindowCheck continuity
between terminalsContinuity presentNo continuity
Faulty power
relay
@and @of
relay.window relayReplace power
window relay.
With battery voltage
applied between
terminals @and
@of relay, check
continuity between
terminals
@ and @of relay.
4
Actuator
Check contrnuityassembly
between terminalsNO continuity present
between terminalsContinuity present
between terminals
in SPORT mode.@and 0.@and 0.
Continuity present
between terminalsNo continuity present
between terminals
@and
0.@and 0.
Check continuity
between terminalsContinuity present
between terminalsNO continuity presentbetween terminalsFaulty actuator
Replace actuator
while idling in
@and 0.@and @assemblyassembly.
TOUR mode.NO continuity present
between terminalsContinuity present
between terminals
@and
0.@and 0.
Apply battery
Motor operates.Motor does not
voltage between
terminals @andoperate.
0.Motor turns inMotor does not
reverse directionturn.when polarity is
reversed.
5CableOperate activeBroken orexhaust switchActuator operates
and valve operatesActuator operates,
but valve doesReplace or adjust
(while idling)
as well.not work.maladjusted cable cable
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.SERVICE BRAKES -Anti-lock Braking System Troubleshooting35-13 'A ABS warning light does not light at all.
iJ[Explanation][Hint]
When it does not light up at all, there is a strongIf other warning lights do not light up either, fuse is
possibility that there is trouble with ABS warningprobably blown.
light or with power to the light.
id
r
f%ER RELAY
110
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59
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ABS-ECU
Kxss-AK-RSGOIA
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SERVICE BRAKES- Anti-lock Braking System Troubleshooting
Yes
Turn the ignition switch OFF and
check.
4- No
Does voltage between
harness connector terminal
No. 14 and ground indicate
battery voltage?combination meter from
fuse No. 11 is broken.
Yes
ylCircuit in combination meter
is broken.
Is there continuity between combination
meter No. 58 and No 59 terminals7
.rT/“I./ Faulty1 +I[&
r,No ,IAre instrument panel wiring harness
and body wiring harness connected
properly?Connect connectors firmly.
(Check for pins pulled out or
bent, and repair as needed.)
Yes
Broken wire in ECU, valve relay or both
drive circuits. Check both circuits.
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35-26SERVICE BRAKES -Anti-lock Braking System TroubleshootingI
TROUBLESHOOTING (ABS - AWD)Confirm condition in the following way and diagnosis accordingly.
Does the ABS warning light illuminate as described
below up to the time the engine starts?(2) With the ignition key in the “START” position,
(1) When the ignition key is turned to the “ON”power to the ABS ECU is interrupted and the
position, the ABS ECU causes the ABS warningABS warning light remains lit because the valve
relay is OFF.
light to flash four times in about one second (3) When the ignition key is returned from the
(during which the valve relay self check is made)
and then causes it to go out.“START” position to the “ON” position, the
ABS warning light flashes four times in about
one second (during which the valve relay self
-check is made again) and then goes out.
III
OFFu--I-II
ST
ONACC, LOCK
114A0594Yes
>CONTINUED ON NEXT PAGE
No
No.
Trouble condition
Major causesRemedy
1ABS warning light does not light up at all.l ABS warning light bulb is burnt out.
ACC,LOb--
l Open in ABS warning light electricalCheck, using flowchart A (Refer to
ABScircuit (check for blown fuse)P.35-31.)warningOFFlight
lgmtlon
key
14AO590
2When the ignition key is turned to the
“ON” position, it remains lighted.l Fail safe is functioning due to ECU
self diagnosis.Check, using flowchart B (Refer toABS,“,F
J-l Short in ECU warning light drive circuitP.35-34.)warningl Malfunction of ECUlight
Ignition
key.;i,LOi h
3Does not illuminate when ignition key is
in “START” position.l Malfunction of valve relayl Break in harness between ABS warningCheck, using flowchart C (Refer to
light and HUP.35-36.)l Break in harness between HU andwarning
body ground
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SERVICE BRAKES -Anti-lock Braking System Troubleshooting35-31
L’A ABS warning light does not light at all.
[Explanation][Hint]
When it does not light up at all, there is a strongIf other warning lights do not light up either, fuse is
possibility that there is trouble with ABS warningprobably blown.
light or with power to the light.
FUSIBLE LINEI
L--L5--
i
IGNITIONSWITCH(IG2)IGNITIONSWITCH(IG1)
(L-R)-' .3
G-RI
7
!
m59COMBINATION
iMETER
1:I1o‘r_- ----- ‘2 -- ‘Ti----‘%--‘79 -_----- -7 -- “j-+3 -----1
=p!Rq3;
g:W
25
b
ABS-ECU
n=
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