ignition MITSUBISHI 3000GT 1991 Service Manual

52B-60 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - SRS Diagnosis Unit (SW
0I/-Battery e
13R0721lSF1072:
SRS diagnosis unitView A13R0704
To front impact sensor
(L.H.)
\To front impact sensor (R.H.1\I
I- - -,I1
\To clock springTo body wiring harness (14-pin)19FOllt
r-TSB I
SERVICE POINTS OF REMOVAL1. DISCONNECTION OF THE NEGATIVE
(-) BATTERY
CABLE FROM THE BATTERYTurn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.5. DISCONNECTION OF THE SRS DIAGNOSIS UNIT AND
EACH HARNESS CONNECTOR(1) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
CautionA double-lock mechanism is employed for the
connector of the SRS diagnosis unit, so care mustbe taken not to damage the connector by using
excessive force or by not disconnecting it correctly.(2) Remove each connector from the SRS diagnosis unit
while pressing down the lock of each connector. (Refer
to
P.52B-9.)
INSPECTIONlCheck the SRS diagnosis unit case and brackets for dents,
cracks or deformities.
lCheck connectors and lock lever for damage, and terminals
for deformities.
CautionIf a dent, cracks, deformation or rust discovered,
replace the SRS diagnosis unit with a new one.
NOTEFor checking of the SRS diagnosis unit other than described
above, refer to the section concerning troubleshooting.
(Refer to
P.52B-17.)
Revision
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS) -SRS Diagnosis Unit (SDU) 52B-611330721
13R072i
ht-----
SERVICE POINTS OF INSTALLATION
PRE-INSTALLATION INSPECTIONBefore SRS diagnosis unit is installed in the vehicle, it must be
visually inspected. If a dent, crack or other deformation is
detected, discard the SRS diagnosis unit and replace it with a
new one that passes the visual inspection.
6. INSTALLATION OF SRS DIAGNOSIS UNIT
With the projection part of the SRS diagnosis unit placed
against the bracket as shown in the figure, securely install
the SRS diagnosis unit.
CautionThe SRS may not activate properly if SRS diagnosis
unit is not installed properly, which could result in
serious injury or death to the vehicle’s driver.
5. CONNECTION OF THE SRS DIAGNOSIS UNIT AND
EACH HARNESS CONNECTORAfter connecting each harness connector securely and
correctly to the SRS diagnosis unit, be sure to press down
the lock lever of the SRS diagnosis unit.
POST INSTALLATION INSPECTION
Reconnect the negative battery terminal. Turn the ignition
switch to “ON”. Does the “SRS” warning light illuminate for
about 7 seconds, turn OFF and then remain extinguished for at
least 45 seconds? If yes, SRS system is functioning properly. If
no, consult page
52B-17.
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52B-62Air Bag ModuleSUPPLEMENTAL RESTRAINT SYSTEM (SRS) - and Clock Spring
AIR BAG MODULE AND CLOCK SPRINGM52PDCA
Caution1. Never attempt to disassemble or repair the
air bag module or clock spring.
If faulty, replace it.
2. Do not drop the air bag module or clock
spring or allow contact with water, grease or
oil.Replace it if a dent, crack, deformation or
rust are detected.
3.The air bag module should be stored on a flat
surface and placed so that the pad surface isfacing upward.
REMOVAL AND INSTALLATION1
l After setting the steering wheel antthe front wheels to the stralghtaheaposltion. remove the ignition key.5NmDo not place anything on top of it.
4.Do not expose the air bag module to temper-ILJ
ature over 93°C (200°F).
5After an air bag has deployed, replace with anew air bag module and check the SRS
operability.6. Wear gloves and safety glasses when han-
dling an air bag that has already deployed.
7. An undeployed air bag module should only
be disposed of in accordance with the proce-dures
[P.52B-69 - P.52B-721.
Air bag module removal stepsI)4
Post-installation inspection4*1. Connection of the negative (-1 battery
cable to the battery
*I) I)* 2. Air bag module3. Radio remote control assembly
4. Horn contact plate
5. Horn contact plate and wire
6. Horn button
7. Spring
l 4Pre-installation inspection
Clock spring removal steps
I)4Post-installation inspection4*1. Connection of the negative (-1 battery
cable to the battery
+* l +2. Air bag modulel * l a8. Steering wheelKnee protector 1(Refer to GROUP 52A-
Column coverJ Instrument Panel.)Floor console (Refer to GROUP 52A- FloorConsole.)
*I) *+9. Clock spring and SRS diagnosis unitconnection10. Clock spring and body wiring harness
connection
I)* 11. Clock springI)4Pre-installation inspection
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19FO150
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Air Bag ModuleSUPPLEMENTAL RESTRAINT SYSTEM (SRS) - and Clock Spring526-6319FOlll
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SERVICE POINTS OF REMOVAL1. DISCONNECTION OF THE NEGATIVE (-) BATTERY
CABLE FROM THE BATTERYTurn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.2. REMOVAL OF AIR BAG MODULE
(1) Remove the air bag module mounting nut using a
socket wrench from the back side.
(2) When disconnecting the connector of the clock spring
from the air bag module, press the air bag’s lock toward
the outer side to spread it open. Use a screwdriver, as
shown in the figure at the left, to pry so as to remove
the connector gently.
CautionWhen disconnecting the air bag module-clock
spring connector, take care not to apply excessiveforce to it.
(3) The removed air bag module should be stored in a
clean, dry place with the pad cover face up.
8. REMOVAL OF STEERING WHEEL
Remove the steering wheel by using a steering wheel
puller.
CautionDo not hammer on the steering wheel. Doing so may
damage the collapsible column mechanism.
9. DISCONNECTION OF THE SRS DIAGNOSIS UNIT AND
CLOCK SPRING CONNECTION
(1) Remove the rear console assembly.
(Refer to GROUP 52A
- Floor Console.)
(2) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
Caution
A double-lock mechanism is employed for the connec-
tor of the SRS diagnosis unit, so care must be taken notto damage it by using excessive force or by not
disconnecting it correctly.
TSB Revision

Air Bag Module
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - and Clock Spring52B-67Multi-use Testkr
ROM pack
(MB991 341)(MB991 359)
Diagnosis/
service
data
oumutGround
16LOO9'(3) Insert ROM pack into the Multi-use Tester and connect
tester to Diagnosis Check Connector in glove compart-
ment.
(4) Reconnect negative terminal of battery, and turn the
ignition key to the “ON” position.
(5) Conduct self-diagnosis using Multi-use Tester to ensure
entire SRS operates properly, except open circuit of air bag
module (“22. SQUIB TRBL 2”). (Refer to
P.52B-18.)(6) Turn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.
11. INSTALLATION OF CLOCK SPRINGAlign the mating mark and “NEUTRAL” position indicator of
the clock spring, and, after turning the front wheels to the
straight-ahead position,install the clock spring to the
column switch.
CautionIf the clock spring’s mating mark, is not properly
aligned, the steering wheel may not be completely
rotational during a turn, or the flat cable within the
clock spring may be severed, obstructing normal
operation of the SRS and possibly leading to serious
injury to the vehicle’s driver.
9. CLOCK SPRING AND SRS DIAGNOSIS UNIT CONNEC-
TIONAfter securely and correctly installing the clock spring’s
connector to the SRS diagnosis unit, be absolutely sure to
press down the lock lever of the SRS diagnosis unit.
13R072113R072;8. INSTALLATION OF STEERING WHEEL
(1) Before installing the steering wheel, be sure to first turn
the vehicle’s front wheels to the straight-ahead position
and align the mating mark and “NEUTRAL” position
indicator of the clock spring.
Caution
Be sure when installing the steering wheel, that the
harness of the clock spring does not become caughtor tangled.
(2) After clamping, turn the steering wheel all the way in
both directions to confirm that steering is normal.
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52B-68SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - %%%$kgSRS warning
light
/------ r--l
I
19FOO722. INSTALLATION OF AIR BAG MODULE
(1) Arrange the wiring of the horn switch as shown in the
figure at the left, and hook up in place.
(2) Install the air bag module, taking care that no wiring is
vicaught by it.
POST-INSTALLATION INSPECTION(1) After installing the clock spring, the steering wheel, the
column covers and the air bag module, check steering
wheel for noise, binds or difficult operation.
(2) Reconnect the negative battery terminal. Turn the ignition
switch to “ON”. Does the “SRS” warning light illuminate
for about 7 seconds, turn OFF and then remain extin-
guished for at least 45 seconds? If yes, SRS system is
functioning properly. If no, consult page
52B-17.
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L
2OFOO85HEATERS AND MANUAL AIR CONDITIONER
- Trqubleshooting55-7
TROUBLESHOOTING HINTSInspection of Air Conditioner Control Unit
Disconnect the amplifier and inspect the connector on the wire
harness side as shown in the chart below.
Test Conditions:
(1) Ignition switch: ON
(2) Air conditioner switch: ON
(3) Temperature control lever: MAX. COOL
(4) Blower switch: HI
1 Terrrnal 1Signal
Conditions
8Auto compressor control unit groundAt all timesov
1Auto compressor control unit power
SUPPlY
When ignition switch is ON
Battery
voltage
6Air conditioner compressor relay
When all conditions for switch-ON of
Battery
the compressor are satisfiedvoltage
I ’I
Air conditioner switch: A/C
When air conditioner switch pressed inBattery
to second stepvoltage
Air conditioner switch: ECONO
When air conditioner switch pressed in
to first step
13Fin-therm0 sensor 0Ignition switch, blower switch and airApprox.
conditioner switch: ON2.5V/
LJ14Air-inlet sensor 0Ignition switch, blower switch and air
conditioner switch: ONApprox.IV
15Fin-therm0 sensor 0Ignition switch, blower switch and air
conditioner switch: ON
Ambient temperature: 4°C (39°F)
OV
18Air-inlet sensor 0Ignition switch, blower switch and air
conditioner switch: ON
Ambient temperature: 4°C (39°F)ov
TSB Revision

55-40FULL AUTO AIR CONDITIONER - Troubleshooting
FULL AUTO AIR CONDITIONER
TROUBLESHOOTINGM55ECAF
TROUBLESHOOTING PROCEDUREd
(1) Check that the air ducts and rods are not off.
(2) Check that connectors are properly connected and fuses are not blown.
(3) Using an analog voltmeter or multi-use tester, check diagnosis outputs. If failure code is being output,
check the failing system and repair as necessary. (Refer to Diagnosis Display Patterns and Codes on
P.55-55.)
(4) If the diagnosis outputs are normal, check for terminal voltage or continuity with a circuit tester accordingto the troubleshooting chart by symptom. (Refer to control unit terminal voltages on
P.55-45 - 52.)
(5) In carrying out the troubleshooting procedure, first look up the Troubleshooting Quick-Reference Chart toknow the inspection items and then start the
insoection orocedure detailed in the following pages.
(6) When checking components, be sure to disconnect the connectors first.
TROUBLESHOOTING QUICK-REFERENCE CHART
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Symptom
Inspection item
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Air conditioner does not
operate when the ignition
not raise even the air
conditioner is operating
(No’warm air coming out).
LJ
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3Interior temperature does
not lower even the air
conditioner is operating
(No cold air coming out).
4
Blower motor does not rotate.
5Blower motor does not stop
rotating.
06 Inside/outside-air selectordamper does not operate.
7Outlet selector damper does
not operate.
8Condenser fan does not
operate when the air
conditioner is activated.9 Air-conditioner graphic display
does not function correctly.
IO Set temperature returns to25°C (122°F) when the ignitionswitch is turned ON and OFF.
NOTE(1)
(2)0 indicates the component requiring inspection. (Numbers in 0 are the priority order.)
Use an analog voltmeter or multi-use tester to check the control unit.TSB Revision

FULL AUTO AIR CONDITIONER - Troubleshootina55-43
-
JO
6
-
7
s
s
-
IO
-
Symptom
Inside/outside-air
selector damper
does not operate.
Outlet selector damperDefective outlet selector damperdoes not operate.potentiometer input circuit
Condenser fan doesnot operate when
the air conditioner is
activated.
Air-conditioner graphic
Open-circuited harness betweenCorrect harness.
display does notcontrol panel and air conditioner
function correctly ’control unitI I
Set temperaturereturns to 25°C (112°F)when the ignition
switch is turned ON
and OFF.
Probable causeRemedyRef. page
Defective control panel
Defective air conditioner control
unit
Replace control panel.
Replace air conditioner
control unit.55-56
55-56
Check diagnosis output.Replace defective parts.
Defective outlet selector drive motor
Replace outlet selector
drive motor.
Incorrect engagement of outlet
selector drive motor and outlet
selector damperEngage correctly.
Malfunctioning DEF., FACE, andCorrect DEF., FACE, and
FOOT damperFOOT damper.
Open-circuited harness betweenCorrect harness.outlet selector motor and control unit
Defective control panelReplace control panel.I55-56I
Defective air conditiner control unitReplace air conditioner
control unit.55-56
Defective condenser fan motor relayReplace power relay.
II
Defective water temperature switchReplace water temperature
switch.GROUP 14
Defective condenser fan motor
Replace condenser fan motor.55-33
Defective control panelReplace control panel.I55-56I
Defective air conditioner control unitReplace air conditionercontrol unit.
55-56
Open-circuited power circuitharnessCorrect harness.
Defective air conditioner control unitReplace air conditioner
control unit.55-56TSB Revision
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FULL AUTO AIR CONDITIONER - Troubleshooting
CIRCUIT AND BENCH CHECK
i1 1. Inspection of air conditioner control unit power source circuit 1
,
L
lgniswii
C:
I:Q
6r------.
i
17
Ir~ B27 u
tion
tch 1(IG2)Junction block2:
E
28--6\
3
r-7\--7
LPower source 1I I
AYAir-conditioner control unit
2OFOO61
Troubleshooting Hintsl Air conditioner control unit terminal voltage
Terminal No.Signal nameConditionTerminal voltage
3Backup power sourceNormallyBattery voltage28, 36
Air conditioner control unitIgnition switch ONBattery voltage
power source
27, 35Air conditioner control unit
Normallyov
ground
1 TSB RevisionI