1991 MITSUBISHI 3000GT ESP

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Page 107 of 1146

MITSUBISHI 3000GT 1991 Service Manual FUEL
SYSTEM
CONTENTSM13AA- _
CRUISE CONTROL SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . .158SPECIFICATIONS. . . . . . . .._._....................................................155
CRU

FUEL
SYSTEM
CONTENTSM13AA- _
CRUISE CONTROL SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . .158SPECIFICATIONS. . . . . . . .._._....................................................155
CRUISE CONTROL SYSTEM*................................................185
SERVICE ADJUSTMENT PROCEDURES............................178
Cruise Control Cables Inspection and Adjustment........178Cruise Control SystemInspection....................................179individual Parts Inspection....................................................181
SPECIAL TOOLS........................................................................159
SPECIFICATIONS....................................................................158
General Specifications........................................................158Service Specifications........................................................158
TROUBLESHOOTING............................................................159
Check Chart............................................................................163Harness and Components Layout....................................176Preliminary Inspection........................................................159Self-diagnosis Checking........................................................172Troubleshooting Quick Reference Chart............................159
ENGINE CONTROL............................................155
ENGINE CONTROL................................................................157
SERVICE ADJUSTMENT PROCEDURES............................156
Accelerator Cable Inspection and Adjustment................156Accelerator Switch Inspection and Adjustment................156
Service Specifications........................................................
155
TROUBLESHOOTING............................................................
155
Accelerator Cable and Accelerator Pedal........................155
FUEL SYSTEM....................................................3
DETONATION SENSOR........................................................154
FUEL FILTER............................................................................
153
FUEL LINE AND VAPOR LINE................................................151
FUEL PUMP AND FUEL GAUGE UNIT ASSEMBLYAND OVERFILL LIMITER (TWO-WAY VALVE)................149
FUEL TANK.................................................................................146
GENERAL INFORMATION
....................................................
3
MPI System Diagram............................................................3
INJECTOR................................................................................141
ON-VEHICLE INSPECTION OF MPI COMPONENTS........36
Active Exhaust Control Unit ............................130Air Conditioner Switch and Power Relay............................82Air Flow Sensor....................................................................54Anti-lock Brake Signal ........................................133Barometric Pressure Sensor................................................60CONTINUED 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!(I)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 (from
rendering 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
528 -Supplemental Restraint System (SRS), before beginning any service or maintenance of any component of theSRS or any SRS-related component.

Page 123 of 1146

MITSUBISHI 3000GT 1991 Service Manual FUEL SYSTEM - Troubleshootina13-17
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
I;
L
/
L/
Items
Won’t start(no initial combustion)-g Starting problem
2(i;il;i combustion, then
Symptom
The starter i

FUEL SYSTEM - Troubleshootina13-17
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
I;
L
/
L/
Items
Won’t start(no initial combustion)-g Starting problem
2(i;il;i combustion, then
Symptom
The starter is used to crank the engine, but there is no combustion within the
cylinders, and the engine won’t start.
There is combustion within the cylinders, but then the engine soon stalls.(Starting takes a long
time.)Engine won’t start quickly.
Idling instability
(Rough idling)Engine speed doesn’t remain constant; changes during idling.Usually, a judgement can be based upon the movement of the tachometer
>.rpointer, and the vibration transmitted to the steering wheel, shift lever, body, etc.
EThis is called rough idling.
s0
Incorrect idling speedThe engine doesn’t idle at the usual correct speed.
F.-=e-ImpDr;p;ertidling continuityThis non-continuity of idling includes the following elements.(1) Die outPass out. . . . . The engine stalls when the foot is taken from the accelerator pedal,regardless of whether the vehicle is moving or not.(2) Pass out . . The engine stalls when the accelerator pedal is depressed or while
it is being used.
Hesitation
Sag
“Hesitation” is the delay in responseHesitation
of the vehicle speed (engine rpm) thatLNormaloccurs when the accelerator pedal is
depressed in order to accelerate from---
the speed at which the vehicle is nowx\a,r- ,
traveling, or a temporary drop in vehi-g Initialv) accelerator**’ ,8’ /cle speed (engine rpm) during such+ pedal/,’ /
’
acceleration.2 depression
Serious hesitation is called “sag”.2
1“*’.’
/’ ,’I&L-e**’Ii Sag
Poor acceleration
Time1 FU022:
Poor acceleration is inability to obtain an acceleration corresponding to thedegree of throttle opening, even though acceleration is smooth, or the inability toreach maximum speed.
0, Stumble.F
‘iIn
Engine rpm response is delayed when
the accelerator pedal is initially.
depressed for acceleration from thestopped condition.
$Normal
x
:Initial
3acceleratorI//
c
-7
pedal2 depression,#’,
4,/Idling *--’Stumble
Shock
cTime1 FUO22L
The feeling of a comparatively large impact or vibration when the engine isaccelerated or decelerated.
SurgeThis is repeated surging ahead during constant speed travel or during variable
speed travel.
Knocking
A sharp sound like a hammer striking the cylinder walls during driving and which
adversely affects driving.TSB Revision

Page 138 of 1146

MITSUBISHI 3000GT 1991 Service Manual 13-32FUEL SYSTEM - Service Adjustment Procedures
@ Using a jumper wire, ground the self-diagnosis/data
transmission selector terminal (terminal
@) of theI
diagnosis connector (white).
dSelf-diagnosis

Page 200 of 1146

MITSUBISHI 3000GT 1991 Service Manual FUEL SYSTEM - On-vehicle Inspection of MPI Components
OXYGEN SENSOR <Non Turbo>
7FUO786
Theoretical A/F
14
1516A/FEClOOiControl relay
2 dI 1:
Engine control unit
@ Equipment side
connector
7FUO969
En

Page 203 of 1146

MITSUBISHI 3000GT 1991 Service Manual FUEL SYSTEM - On-vehicle Inspection of MPI ComDonents13-97
,
7FU1014
7FUlOl5
SENSOR INSPECTION
(1) Disconnect the oxygen sensor connector.
(2) Check that there is continuity [approx. 20
IR at 20°C (

Page 204 of 1146

$MITSUBISHI 3000GT 1991 Service Manual FUEL SYSTEM - 0 n-vehicleInspection of MPI Components OXYGEN SENSOR <Turbo> M13YHAA2I 2 2-J _ Fr;;syn m-wr li \\\Oxygen sensor I7FU1004Theoretical A/F@Oxygen sensor (rear)Oxygen sensor Equipment side($

Page 206 of 1146

MITSUBISHI 3000GT 1991 Service Manual 13-100FUEL SYSTEM - 0
n-vehicleInspection of MPI Components
SENSOR INSPECTION
(1) Disconnect the oxygen sensor (rear) connector and connect
the special tool, Test Harness, to the oxygen sensor (rear)

Page 208 of 1146

MITSUBISHI 3000GT 1991 Service Manual 13-102FUEL SYSTEM - On-vehicle Inspection of MPI Components
TROUBLESHOOTING HINTSHint 1: If the engine is hard to start when hot, check fuel pressure and check the injector for leaks.
Hint 2:If the in

13-102FUEL SYSTEM - On-vehicle Inspection of MPI Components
TROUBLESHOOTING HINTSHint 1: If the engine is hard to start when hot, check fuel pressure and check the injector for leaks.
Hint 2:If the injector does not when the engine that is hard to start is cranked, the following as well as the
Iinjector itself may be responsible.
(1) Faulty power supply circuit to the engine control unit, faulty ground circuit
\-J
-(2) Faulty control relay
Hint 3:(3) Faulty crank angle sensor, top dead center sensor
If there is any cylinder whose idle state remains unchanged when the fuel injection of injectors is cut
one after another during idling, make following checks about such cylinder.
(1) Injector and harness check
(2) Ignition plug and high tension cable check
(3) Compression pressure check
Hint 4: If the injector harness and individual part checks have resulted normal but the injector drive time is
out of specification, the following troubles are suspected.
(1)Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
(2) Loose EGR valve seating
(3) High engine resistance
INSPECTIONUsing Multi-use Tester
FunctionItem No. Data displayCheck conditionCoolant temperatureStandard valueData reading 41
Drive time”’Engine: Cranking0°C (32”F)*zApprox. 17 ms
20°C (68°F)Approx. 46 ms
8O"C(176"F)Approx. 11 ms
Function
Data readingItem No.Data display
41Drive time*3l Engine coolant tem-perature: 80 to 95°C700 rpm (Idle)2.4-3.0 ms
(176 to 205°F)2,000 rpm2.0-2.6
msl Lamps, electric coolingfan, accessory units:When sharp racing isTo increaseAll OFF
madel Transaxle: Neutral
(P range for vehicle
with A/T)l Steering wheel: Neutral
Check conditionEngine stateStandard value ,
.---NOTE“I : The injector drive time refers to when the supply voltage is 11 V and the cranking speed is less than 250 rpm.*2: When coolant temperature is lower than 0°C (32°F). injection ismade by four-cylinders.---simultaneously.
“3: When the vehicle is new [within initial operation of about 500 km (300 miles)], the injector drive time may be about
10% longer.
Function
Actuator testItem No.
Drive content
Check conditionNormal state
01No. 1 injector shut offEngine: Idling afterIdle state to change
02No. 2 injector shut offwarm-up
(Shut off the injectorsfurther (becoming less
in sequence during afterstable or stalling)
03
No. 3 injector shut offengine warm-up, check
04No. 4 injector shut offthe idling condition)
05No. 5 injector shut off
06No. 6 injector shut off
TSB Revision

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