ignition MITSUBISHI 3000GT 1991 Service Manual

BODY - Troubleshooting42-9
OPERATION
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0When, with the ignition switch at the ON
position, a power-window (main or sub) switch
(“UP” side or “DOWN” side) is pressed, current
flows through sub-fusible link No. 8 and to the
power-window motor, thus causing the door
window glass to close or open.
When the “DOWN” side of the power-window
main switch at the driver’s side is pressed all the
way, it is locked at the pressed-in position, and
the power-window motor operates until the
door glass is fully opened.
When the power-window lock switch is set to
the “LOCK (ON)” position, the power-window
motor will not operate if any switch (main or sub)
other than at the driver’s side is operated.
A circuit breaker is provided in the power-window motor in order to prevent damage to the
motor as a result of excessive current.
For reference: Circuit breaker characteristics
Motor operation is restricted at high
temperatures
:
[20 - 25°C (68 - 77”F)].Current flow is cut by an initial current
occurs within 60 seconds if then left as
Iflow time of four to 40 seconds; resetis.The timer function of the ETACS permits the
power-window relay to remain ON for 30
seconds after the ignition switch is switched
OFF.If, during that period of time, the front door is
opened, the power-window relay is switched
OFF, and the power windows can no longer be
operated.
TROUBLESHOOTING HINTS1. All door windows cannot be opened or closed.
l Check sub-fusible link No. 8.
l Check the power-window relay.
l Check the power-window main switch.
2.One of the door windows cannot be opened or
closed.
(1) Neither of the power-window switches
(main or sub) operates.
l Check the power-window main switch.
lCheck the power-window motor for the
power window that does not operate.
(2) Either the power-window main switch or
sub switch does not operate.
lCheck the power-window switch for the
power window that does not operate.
3. The one-touch down switch function only does
not operate.
lReplace the power-window main switch.
4.The power window operation by ETACS control
after the ignition switch is switched OFF does
not function.
l Refer to
P.42-43.
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42-12
BODY - Troubleshooting
OPERATIONl When the door lock switch is set to the LOCK side (or
UNLOCK side), the LOCK side (or UNLOCK side) of the
door lock relay is turned ON and the door actuators of
alIsadoors operate.
lIf the driver seat side door (or assistant seat side door) is
opened and the driver seat side inside lock knob (or
assistant seat side inside lock knob) is locked with the key
inserted in the ignition switch, the ETACS unit grounds the
unlock side circuit of the door lock relay to unlock all doors.
This way, failure to remove the key is prevented.
NOTEThe door lock actuator contains a PTC thermister to prevent
damage caused by overheating of the motor. If the central
door lock is frequently used, the actuator may temporarily
fail to operate. If it returns to normal in a few minutes, it is
not defective.
TROUBLESHOOTING HINTS
1. One of the door lock actuators fails to operate.
l Check the door actuator which fails to operate.
2. The ignition key reminder system does not function.
l For information concerning ETACS control, refer to
P.42-55.

BODY - Power Window42-43
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Diagnosis connector-Gr&nd
ETkCS ‘6R”38
Nith voltmeter-.___
1Withmulti-use tester
POWER WINDOWM42MHAH
TROUBLESHOOTING GUIDE
INPUT CHECK
Using the multi-use tester or voltmeter, check whether or not
the input signals from each switch are being input to the
ETACS unit.
(I), Connect the multi-use tester to the diagnosis check
connector located at the right side of the junction block or
connect the voltmeter between the ETACS terminal and
the ground terminal.
(2) Check if the buzzer of the multi-use tester sounds or the
needle of the voltmeter moves when each switch noted
below is operated.
If the buzzer sounds or the needle moves, the input signals
are being input to the ETACS unit, so that switch can be
considered to be functioning normally. If not, the switch or
switch input circuit is faulty. Check the switch and the
switch input circuit.
l Ignition switch
l Door switch
TROUBLESHOOTING QUICK-REFERENCE TABLE
For information concerning the locations of electrical components, refer to
P.42-51.
ProblemThe power windows do not operateNhen
the ignition switch is at the“ON” position.Probable cause
Damaged or discon-netted wiring of the
ignition switch input
circuitCheck method
If a malfunction is in-dicated as a result of
checking the input
signals, check by fol-
lowing individual part
and the circuit check
No. 2 procedures(P.42-46).Remedy
Repair the wiring
harness.
Damaged or discon-Check by following
in-Repair the wiring har-
netted wiring of thedividual part and theness, or replace thepower window relaycircuit check No. 3power window relay.
activation circuitprocedures (P.42-47).
Malfunction of the
-Replace the electron-electronic control unitic control unit.
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42-44
BODY - Power Window
Problem
Probable causeCheck method
Remedy
The power windows can be opened
and closed immediately after theDamaged or discon-If a malfunction is
in-netted wiring of thedicated as a result ofRepair the wiring har-ignition switch is switched “OFF”, butfront door switch
checking the inputness. or replace the
the power window operation doesfront door switch.
not stop if a front door is openedinput circuit
signals, check by
follow-within 30 seconds.Malfunction of theing individual part and
the circuit check No. 4
front door switch
procedures
(P.42-49).Malfunction of the
-electronic control unitReplace the electron-ic control unit.
The opening and closing operations
of the power windows are possible
after the timer operation time has
elapsed when the ignition switch
is set to the “OFF” position.Short-circuit of the
power window relay
activation circuit
Malfunction of the
front door switchCheck by following
in-dividual part and cir-cuit check No. 3
pro-cedures (P.42-47).Repair the wiring
har-ness, or replace the
power window relay.
Malfunction of the
electronic control unit
-Replace the electron-ic control unit.
NOTE“ECU” (electronic control unit) indicates the ETACS unit.
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42-46BODY - Power Window
2.IGNITION SWITCH INPUT CIRCUITS
BatteryFusible link
20B-Y. ;I II II I ] II ,;rLL30A,l ‘\m 1 2 34 5 6
25
3:6Pz
z03I
=7\-7
Junction block@ (Multi-purpose fuse)
1
ETACS unit(ECU)
4,
m“1 : Vehicles without theft-alarm system“2: Vehicles with theft-alarm system16FO312Description of operation
A condition for operation of this system is the sending of HIGH-level signals to the electronic control unit
when the ignition switch is switched to the “ON” position.
Electronic control unit terminal voltage (Disconnect the connector of the electronic control unit and
check the wiring harness side.)
ECU terminal No. Signal
52Ignition switch: “ON”ConditionIgnition switchOFF
ON
Standardov
System
voltageChecking the individual part
Ignition switch: Refer to GROUP 54
- Ignition Switch.
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42-48BODY - Power Window
Description of operation
When the ignition switch is switched to the “ON” position, and also for a period of 30 seconds after the
ignition switch is switched to the “OFF” position, the transistor of the electronic control unit is switched ON,
and battery voltage is supplied from the battery (through fusible link No. 9) to the power window relay.
In addition, voltage is supplied (through fusible link No. 9) to power window switch and motor as a result of
the switch-ON of the power window relay.
NOTETurn the ignition switch from ON to OFF, and power will be supplied to the power window relay for 30
seconds. However, power supply will be stopped if the door is opened during this period.
Electronic control unit terminal voltage (Disconnect the connector of the electronic control unit and
check the wiring harness side.)
ECU terminal No. Signal
ConditionTerminalvoltage
5*I
7*2Power window relay signalAt all timesSystem
voltageP
NOTE*I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemChecking the individual part
Power window relay: Refer to
P.42-51.
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BODY - Central Door Locking System42-55
Ground ETACS
,611338Nith voltmeterCENTRAL DOOR LOCKING SYSTEM M42ZDAJ
IGNITION KEY REMINDER TROUBLESHOOTING
GUIDE
INPUT CHECK
Using the multi-use tester or voltmeter, check whether or not
the input signals from each switch are being input to the
ETACS unit.
(1) Connect the multi-use tester to the diagnosis check
connector located at the right side of the junction block or
connect the voltmeter between the ETACS terminal and
the ground terminal.
(2) Check if the buzzer of the multi-use tester sounds or the
needle of the voltmeter moves when each switch noted
below is operated.
If the buzzer sounds or the needle moves,. the input signals
are being input to the ETACS unit, so that switch can be
considered to be functioning normally. If not, the switch or
switch input circuit is faulty. Check the switch and the
switch input circuit.
l Door lock actuator
l Door switch
l Key reminder switch
IGNITION KEY REMINDER TROUBLESHOOTING QUICK-REFERENCE TABLE
CENTRAL DOOR LOCKING SYSTEM
Problem
No unlock operation can be made by
pressing door lock knob after
fulfil-ment of following conditions.
l Insertion of key in ignition switch
(key reminder switch OFF)
l Opening of door(door switch ON)Probable causeCheck methodRemedy
Key reminder switchIf found defective afterCorrect harness or
input circuit shortedinput check, check circuit
bench test No. 4
rep:a~~~ key reminder
Key reminder
(P.42-59).switch shorted
Door switch inputIf found defective afterCorrect harness or
circuit brokeninput check, check circuit
replace door switch
bench test No. 5
Breaks in door switch
(P.42-60).Faulty electronic
-Replace the electronic
control unitcontrol unit
NOTE“ECU” (Electronic Control Unit) indicates the ETACS unit
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42-56BODY - Central Door Locking System
CHECKING INDIVIDUAL PART AND CIRCUIT (IGNITION KEY REMINDER SYSTEM)
1. ETACS POWER-SUPPLY AND GROUND CIRCUITS
L-
Batterv
$1,\ .
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‘/1,\/2-“1
m+,2T.,l\ ,.c.i -
151
Junction block (Multi-purpose fuse)
Jumper connector
ETACS unit(ECU)
“I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemz1116FO314Description of operation
The battery supplies a stabilized 5V power supply to the electronic control unit, via the constant-voltage circuit
and terminal (51) directly connected to the battery. If there is an abnormal condition of the power-supply
circuit, other ETACS functions also will not operate.
Electronic control unit terminal voltage (Connection status of electronic control unit connector)
ECU terminal No. Signal
StatusTerminalvoltage
I
51Electronic control unit power supply
At all timesSystem
voltage
IChecking the ground circuit (Disconnect the connector and check the wiring harness side.)
IIII1Terminal No.Connected to/measured part
MeasurementTesterconnectionCheck conditionsStandard57”’
Electronic control unit ground
Resistance57*‘-groundAt all timesContinuity
59”)59*2-ground
NOTE
“I : Vehicles without theft-alarm system.“2: Vehicles with theft-alarm system
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BODY - Central Door Locking System42-57
2. DOOR LOCK ACTUATOR INPUT CIRCUIT
L
ETACS
unit (ECU)
Fusible link @
Junction block
(Multi-purpose fuse)
r7‘?r p O.BBBI
“1 : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemU-U16(RI-U16FO316
‘IL/Description of operation
If the door is opened with the ignition key inserted and then locking is made by means of inside lock knob, the
door lock actuator is brought to the OFF position, sending H signal to the electronic control unit.
This signal operates the timer. circuit of the electronic control unit and the driving circuit operates to actuator
all the door lock actuators.
Electronic control unit terminal voltage (Connection status of electronic control unit connector)
ECU terminal No. Signal
ConditionTerminal
voltage
ll”,13”’ (LH)Door lock actuator switchDoor lock actuator switchsignalLock (OFF)5v
12”‘. 14”:’ (RH)Unlock (ON)ov
Door lock actuator switch circuit test (Disconnect the connector of the electronic control unit and
check the wiring harness side.)
ECU TerminalConnected to/No.measured partMeasurementTester
connectionCheck conditionsStandard
Door lock actuator
ll*‘, 13”’ (LH) switch signalResistance11 *‘-groundDoor lockLock (OFF)12*‘-groundactuator switchNo continuity
12”‘. 14”’ (RH)13*:-ground14*‘-groundUnlock (ON) Continuity
NOTE*1 : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemChecking the individual part
Door lock actuator: Refer to
P.42-62.
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42-58BODY - Central Door Locking SystemI3. DOOR LOCK POWER RELAY ACTIVATION CIRCUIT
Fusible link 0
“I : Vehicles without theft-alarm system“2: Vehicles with theft-alarm system
Door lockactuator:
(LH)
‘d
Door lockactuator(RH)16FO329’Description of operation
If the door is opened with the ignition key inserted and then door locking is made, transistor Tr of the
electronic control unit is turned ON to operate the door lock power relay (unlock side) and the door lock
actuator is unlocked.
NOTEBefore locking the front seat passenger door, make sure that the driver door lock actuator is in the LOCK
position. If the driver door lock actuator is in the UNLOCK position, the front passenger door lock actuator
does not operate.
Electronic control unit terminal voltage (Connection status of electronic control unit connector)
ECU terminal No. Signal
ConditionTerminalvoltage
1XI, 3”’Door lock power relaySystem(unlock side) signalAt all times (except when door unlock isin operation)voltage
NOTE“I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm system
Checking the individual part
Door lock power relay: Refer to
P.42-63.
LJ
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