engine MITSUBISHI 3000GT 1991 Service Manual

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - General lnform=*ion52B-5
r1.c
L
E.
,
iiCAUTION: SRS diagnosis unit
This unit cannot be repaired.
If defective, remove and replace entire unit per
service manual instructions.
Do not disassemble or tamper.
See service manual for handling and storage
instructions.Driver’s air bag information
This vehicle
ha% an air bag which will supple-
ment the driver’s seatbelt in certain frontal
collisions. The air bag is not a substitute for the
driver’s seatbelt in any type of collision. The
driver, and all other occupants, should wear
seatbelts at all times.
WARNING!
If the “SRS” warning light does not come.on
for about 7 seconds when ignition key is turned
to “ON” or engine is started, or if it stays on
while driving, drive the vehicle to your nearest
authorized dealer right away. Also do so if
vehicle’s front end is damaged or if air bag has
deployed.
The air bag system must be inspected by an
authorized dealer ten years after vehicle manu-
facture date shown on certification label lo-
cated on left front door-latch post or door
frame.Read “SRS” section of your owner’s manual
before driving, for important information, about
Dperation, service and disposal of the air bag
svstem.
Do no drop: keep dry.
Failure to follow instructions could render air
bag inoperative and result in driver injury.
F. CAUTION: SRS
Before replacing steering wheel, read service
manual, center front wheels
ahd align SRS
clock spring neutral marks.
Failure to do so may render SRS system
inoperative, risking serious driver injury.
I.
J.WARNING: SRS
This air bag module cannot be repaired. Do not
disassemble or tamper.
Do not perform diagnosis. Do not touch with
electrical test equipment or probes. Refer to
service manual for further instructions, and for
special handling, storage and disposal proce-
dures.
Tampering or mishandling can result in injury.
Danger! Poison. Keep out of the reach of
children.
Contains sodium acid and potassium nitrate
contents are poisonous and extremely flamm-
able. Contact with acid, water, or heavy metals
may produce harmful and irritating gases or
explosive compounds. Do not dismantle, in-
cinerate or bring into contact with electricity or
store at temperatures exceeding
(93.3”C)
200°F.Fast aid: If contents are swallowed induce
vomiting. For eye contact flush eye with water
for 15 minutes. If gases from acid or water
contact are inhaled, seek fresh air. In every
case, get prompt medical attention.
For additional information, see material safety
data sheet (MSDS) for this product.
CAUTION: SRS clock spring
This is not a repairable part. Do not disassem-
ble or tamper.
If defective, remove and replace entire unit per
service manual instructions.
Before replacement, read service manual, cen-
ter front wheels and align neutral marks.
Failure to
foHow instructions may render SRS
system inoperative, risking serious driver in-
jury.CAUTION: SRS
Before removal of steering gearbox, read ser-
vice manual, center front wheels and remove
ignition key.
Failure to do so may damage SRS clock spring
and render SRS system inoperative, risking
serious driver injury.
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i
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - General Information526-7
:ONFIGURATION DIAGRAMS
q Engine compartmentA-09X
/
+m*,.16,IIfc’ \=is\ IL\\
\
\iw I \B/f---TJwdD
’ L&/Y&!!
3BFOO13
qEngine and transaxle (Front view)

B-23B-24Starter motor
B-26 Inhibitor switchA-38
1 TSB Revision

SUPPLEMENTAL RESfRAlNT SYSTEM (SRS) - Troub!eshooting 52B-17TROUBLESHOOTING
M52ECAA
idSRS DIAGNOSTIC PROCEDURES
- INITIAL STEPS’FOLLOW THESE STEPS WHEN BEGINNING ANY SRS SERVICE:
/II/ ,- -u’ 16FO304
SRS warning light
Multi-use fester
(MB991341)RbM pack(MB991359)
Diagnosis/
service data
output
Ground
16LOO9
[TSB
1. Check the SRS fuses (multi-purpose fuses No. 11 and No.
18).If either is loose, tighten it; if damaged or blown, replace it.
.
2.After performing step 1, start engine. Does “SRS” warning
light
illumi.nate for about 7 seconds and then turn OFF? If
yes, SRS system is functioning properly.
If no, continue with following steps.
NOTEIf the battery power supply (multi-purpose fuses No. 11 or
No. 18) is disconnected with the ignition key in the “ON”
position, the SRS warning light will continue to illuminate
even after the fuses are replaced in their original positions.
In this case, the SRS warning light can be extinguished by
turning the ignition switch ON and OFF
10 times.
3. Turn the ignition key to the “LOCK” position.
4. Insert ROM pack into the Multi-use Tester and connect
tester to Diagnosis Check Connector in glove compart-
ment.
5. Start the SRS diagnosis,by conducting TEST 1
(SRSwarninq liqht does not extinguish) or TEST 2 (SRS warning
light does- not illuminate.) which begins on next page or
page
[52B-191.
ivision

52B-18 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting
DIAGNOSTIC SEQUENCE
TEST 1SRS WARNING LIGHT DOES NOT EXTINGUISH
\1 I
Vehicle Model Selection
{
F
1. SELF-DIAG CODE2. SERVICE DATA
3. ACTUATOR TEST
4. SPECIAL TEST
,, I,
0
“CLEAR” and“4”1.
SIMLTD VEH SPD
2. PULSE CHK
3. DRIVE RECORDER4. EXTERNAL COMM
” 1 ”
1’1
y,,
SRS-AIR BAGID NO.: 19INPUTABOVE CODE
I(1) Turn the ignition key to the “ON” position.
(2) The Multi-use Tester display section successfully passes
the self-check and the model selection menu is displayed
after completing the self-check of the Multi-use Tester.
Select 3000GT 91 MDL [No. 3 (Non-Turbo) or No. 4 (Turbo)]
and SRS-AIR BAG system by entering the “YES” key.
(3) If the Multi-use Tester displays “CAN’T COMM.“, check
the Multi-use Tester and vehicle side self-check diagnosis
TSB Revisionconnector for poor connections (Refer to the previous
page.) and perform
[I.If the 3000GT 91 MDL SRS-AIR BAG system selection is
successful, continue with following steps.
(4) Select the “1. SELF-DIAG CODE” function and read (and
write down) all displayed diagnosis codes.
(5) Press the “CLEAR” key to return to the Function Selection
and select the
“4. SPECIAL TEST”.
(6) Pr+FE,the ”
1 ” key and select the “5. ERASE DIAG.
(7) Erase the diagnosis codes following the Multi-use Tester
messages.
(8) Start engine.
Does “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 now.
If no, check the diagnosis codes written down at step (4)
above, refer to SELF-DIAGNOSIS QUICK REFERENCE
CHART
(P.52B-20) and perform service indicated there.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting 52B-39
MB991349SRS Check Harness
connector
View ASRS Check Harness connector @
Ground
II No(5) Connect the now disconnected red harness-side SDU
connector
(14-pin) to the connector @ of the SRS Check
Harness.(6) Check according to the flow chart below, using the digital
multi-meter.
IIIIs there continuity between the No. 191 or No. 20 terminal ofi;RSCheck‘1 ~~~~~;,0~~~~~~.~~~-14.~r1 Ground ‘jrcuit Open1Harness connector @ and ground?
Reconnect negative terminal of
(()
terminal (of SRS Check Harness connec-
tor 0) and the No. 19 or 20 terminal(ground) indicate system voltage?NOTE
- IMPOR
TANT
Yes
(1) Turn the ignition key
to the “LOCK” po-
sition, disconnect
the negative battery
cable and tape the
terminal.
(2) After waiting at least30 seconds, replacethe SDU.(Refer toP.52B-59.)
(1) Turn the ignition key
to the “LOCK” po-
sition, disconnect
the negative battery
cable and tape theterminal.
(2) After waiting at least
30 seconds, repair orreplace the body wir-ing harness. (Refer toP.52B-14.)
(1) If more than 45 seconds of cranking is required to start up the engine, the diagnosis code will be
stored in memory, but if there is no problem, the diagnosis code will be cleared and the SRS willreturn to normal.
(2) After repairing the SRS, reconnect the battery cable, erase the diagnosis code memory from theMulti-use Tester and check the SRS warning light operation to verify the system functions
properly. (Refer to TEST 1.)
(3) SDU
= SRS Diagnosis Unit
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Z~-%Z%&Z% 528-49Manufacture
date
IVEHICLE TYPE: PASSENGER CAR
MU9001/
OOFOOOlSRS
warnmq light- -SDU’
t>19FOlO:SRS MAINTENANCE AND
POST-COLLISION DIAGNOSIS
M52PCAAMAINTENANCE
The SRS must be inspected by an authorized dealer
10 years
after the car manufacture date shown on the certification label
located on left front door latch post.
Maintenance Items
1.“SRS” WARNING LIGHT CHECK
When the ignition key is turned to “ON” or engine started,
the “SRS” warning light will illuminate for about 7 seconds
and then turn off.
This means that the system is functioning properly.
2. SRS COMPONENTS VISUAL CHECK
(1) Turn the ignition key to the “LOCK” position, discon-
nect the negative battery cable and tape the terminal.
CautionWait at least 30 seconds after disconnecting the
battery cable before doing any further work. The
SRS system is designed to retain enough voltage todeploy the air bag for a short time even after the
battery has been disconnected, so serious injury
may result from unintended air bag deployment
if
work is done on the SRS system immediately afterthe battery cable is disconnected.
(2) Remove the rear console assembly. (Refer to GROUP
52A
- Floor Console.)
(3) 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 must
be taken not to damage it by using excessive forceor by not disconnecting it correctly.
(4) Disconnect the red
14-pin connector from the SRS
diagnosis unit while pressing down the lock of the
connector. (Refer to
P.52B-9.)
13R0721113R0722
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55-1
HEATER, AIR
CONDITIONER
AND VENTILATION
CONTENTSM55AA- -
HEATERS AND AIR CONDITIONING................3HEATER UNIT*........................................................................22
SPECIFICATIONS
....................................................................3REFRIGERANT LINE................................................................35General Specifications
........................................................3RESISTOR................................................................................20Lubricants
............................................................................4SAFETY PRECAUTIONS........................................................9Sealant and Adhesive............................................................4
Service Specifications3SERVICE ADJUSTMENT PROCEDURES............................10........................................................
SPECIAL TOOLS4Charging Procedures............................................................11
i
........................................................................Charging the Refrigerant....................................................12Compressor Drive Belt Adjustment....................................11
HEATERS AND MANUAL AIR CONDITIONER5Compressor Noise................................................................16
................................................16
AIR CONDITIONER SWITCH................................................21Handling Tubing andFittings
Idle-up Operation Check....................................................17
BELT LOCK CONTROLLER20Performance Test................................................................15....................................................
BLOWER ASSEMBLYPower Relay Check............................................................17............................................................23Refrigerant Leak Repair Procedure....................................15COMPRESSOR........................................................................
27TestProcedures....................................................................10
CONDENSER AND CONDENSER FAN MOTOR................33TROUBLESHOOTING............................................................5
ENGINE COOLANT TEMPERATURE SWITCH....................
39VENTILATORS (AIR INLET AND AIR OUTLET)................38
EVAPORATOR
........................................................................
25VENTILATORS (INSTRUMENT PANEL)*............................36
HEATER CONTROL ASSEMBLY*
........................................18CONTINUED ON NEXT PAGE
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
(1)A Supplemental Restraint System (SRS), which uses a driver-side air bag, has been installed in the 3000GT.(2)The SRS includes the following components: impact sensors, SRS diagnosis unit: SRS warning light, air bagmodule, clock spring, interconnecting wiring. Other SRS-related components (that may have to be
removed/installed in connection with SRS service or maintenance) are indicated in the table of contents byan asterisk (*).
WARNING!(1)Improper service or maintenance of any component of the SRS, or any SRS-related component, can lead to
personal injury or death to service personnel (from inadvertent firing of the air bag) or to the driver (fromrendering the
SRS inoperative).(2) Service or maintenance of any SRS component or SRS-related component must be performed only at anauthorized MITSUBISHI dealer.
(3) MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B
-Supplemental Restraint System (SRS), before beginning any service or maintenance of any component of theSRS or any SRS-related component.

55-2FULL AUTO AIR CONDITIONER........................40OTHER PARTS........................................................................62
AIR-CONDITIONER CONTROL PANEL*,POWER TRANSISTOR, BELT LOCK CONTROLLER........57
AIR-CONDITIONER CONTROL UNIT*................................56
REFRIGERANT LINE................................................................62
COMPRESSOR
........................................................................62SAFETY PRECAUTlONS........................................................56
CONDENSER AND CONDENSER FAN MOTOR
................
62SENSORS....................................................................................60
DAMPER CONTROL MOTOR ASSEMBLY*........................
58SERVICE ADJUSTMENT PROCEDURES............................56
ENGINE COOLANT TEMPERATURE SWITCH
....................62
TROUBLESHOOTING............................................................40

HEATER, AIR CONDITIONER AND VENTILATION - Specifications55-3
HEATER, AIR CONDITIONER AND VENTILATION
LSPECIFICATIONSM55CA. -
/’
L;
GENERAL SPECIFICATIONS
Items
Heater unit
Type
Heater control assembly
Compressor
Model
Refrigerant unit lubricant
cc (cu.in.1
V belt sizemm (in.)
Dual pressure switch
High pressure switch
kPa (psi)
Low pressure switchkPa (psi)
Freezer prevention
“C (“F)
Refrigerant and quantityg (oz.)
Specifications
Three-way-flow full-air-mix system
Dial type
Scroll type (FX-105 VS)
FREOL S-83 or SUNISO 5GS160 & 20 (9.8 + 1.2)
1,150 (45.3)
OFF: 2,700 (384)ON: 2,100 (299)
OFF: 210 (30)
ON
: 235 (33)
Air temperature thermostatOFF: - 2 (28.4)
ON: 2 (35.6)
R-l 2Approx. 970 (34)
SERVICE SPECIFICATIONSM55CB. -
Items
Standard value
Idle speed when air conditioner onrpm
Resister resistance value1R
Refrigerant temperature sensor
Sensor-ON temperature
“C (“F)
Sensor-OFF temperature“C (“F)
Revolution pick up sensor standard resistance 0
Clutch clearancemm (in.)
Engine coolant temperature switch
Switch-OFF temperature
“C (“F)

Air mix damper potentiometer motor assembly resistanceMAX. HOT
kQMAX. COOL
kS1
Outlet selector damper potentiometer assembly resistanceDEF. position
kS1FACE position
kfl
Water temperature sensor
Sensor-ON temperature
“C (“F)
Specifications
900
f 100 CA/T at P range>
1.76
- 2.06 (Across terminals @and 0)
1 .I 0 - 1.26 (Across terminals @and 0)
0.38 - 0.44 (Across terminals @and @)
Approx. 110 (230) or less
Approx. 155 (311) or more
405
f 35 when ambient temperature is 20°C (68°F)
0.4 - 0.6 (.Ol - .02)
112-118(233-244)
0.2
4.9
2.0
4.3
26.5 f 4 (79.7 + 7)
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55-4 HEATER, AIR CONDITIONER AND VENTILATION -Specifications / Special Tools
LUBRICANTSM55CD. _
ItemsSpecified lubricants
Each connection of refrigerant lineFREOL S-83 or
SUNISO 5GS
Quantity
As required
SEALANT AND ADHESIVEM55CE- -
IItemsSpecified sealant and adhesiveI
Engine coolant temperature switch threaded part3M Nut Locking Part No. 4171 or equivalent
SPECIAL TOOLSMSSDA- -
multi-use tester)
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