1991 MITSUBISHI 3000GT low oil pressure

13-80FUEL SYSTEM - 0
n-vehicle Inspection of MPI Components
POWER STEERING OIL PRESSURE SWITCHMlOYQAA
B
$-
Engine control unit
'107
@ Harness side
connector
ml-
Power steering oil
Pressure switch
7FUO536700-2.000 1.500-2.000(100-284) (213-284)Pressure [kPa (psi)]
0, l.oIu
OPERATIONl
The power steering oil pressure switch converts presence/absence of power steering load into low/high
voltage and inputs it to the engine control unit, which then controls the idle speed control servo based on
this signal.l The battery voltage in the engine control unit is applied through a resistor to the power steering oil
pressure switch. Steering operation causes the power steering oil pressure to increase, turning the
switch on. As a result, continuity is produced between the battery voltage applied and ground. This
causes the power steering oil pressure terminal voltage to go from high to low.
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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
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13-110FUEL SYSTEM - On-vehicle Inspection of MPI Components
IDLE SPEED CONTROL SERVO (STEPPER MOTOR TYPE)\
7FUO64;Ball beam
‘9
L PlntleControl relay
@ Harness side
connector
\/1, \,\/“1“3 “4 “6Idle speed
control servo
OSCIIIOOSCIIIOOSClllOosclllomu--
/(a /(IT ),!j /I,, Enginecontrol unit
BPPP
7FUO518Engine control unit connector
7FUO653
OPERATION
lThe intake air volume during idling is controlled by opening ‘or closing the servo valve provided in the air
path that bypasses the throttle valve.’
lThe servo valve is opened or closed by operating the stepper motor in the speed control servo in normal or
reverse direction.
lThe battery power is supplied to the stepper motor through the control relay. As the engine control unit
turns on power transistors in the unit one after another, the stepper motor coil is energized and the motor
rotates in normal or reverse direction.
TROUBLESHOOTING HINTSHint 1:If the stepper motor step increases to 100 to 120 steps or decreases to 0 step, faulty stepper motor
or open circuit in the harness is suspected.
Hint 2: If the idle speed control servo harness and individual part checks have resulted normal but the
stepper motor steps are out of specification, the following faults are suspected.
(I) Poorly adjusted reference idle speed
(2) Deposit on the throttle valve
(3) Air leaking into the intake manifold through gasket gap
(4) Loose EGR valve seat
(5)Poor combustion in the cylinder (faulty ignition plug, ignition coil, injector, low compression
pressure, etc.)
\L.J
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FUEL SYSTEM - On-vehicle lnwection of MPI ComDonents13-121
LEGR CONTROL SOLENOID VALVE - Non Turbo, Turbo>MlBYZBAControl relav
EGR control
solenoid valve@ Equipment side
connector
Engine
control
unitEngine control unit connector
7FUO653
OPERATION
lThe EGR control solenoid valve is a duty control type solenoid valve. It makes control by leaking EGR valve
operating negative pressure to the throttle body A port.
lPower supply from the battery is sent through the control relay to the EGR control solenoid valve. When
the engine control unit turns off the power transistor inside the unit, current no more flows through the
coil and EGR valve operating negative pressure leaks.
TROUBLESHOOTING HINTIf the results of EGR control solenoid valve on-vehicle and off-vehicle inspections are normal but the
self-diagnosis code for EGR system failure is displayed, check the EGR valve, vacuum hose and EGR passage
for blocking.
c.
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FUEL SYSTEM - On-vehicle Inspection of MPI ComDonents13-123FUEL PRESSURE CONTROL VALVE
Control relay
Fuel pressure
control valveEquipment
connectorside
Enaine control unit
connector
7FUO653
OPERATION
lThe fuel pressure control valve is an ON-OFF type solenoid valve that switches the pressure introduced to
the fuel pressure regulator between either intake manifold pressure or barometric pressure.
lBattery power is supplied to this valve via the control relay. When the engine control unit turns ON the
internal power transistor, the coil is energized to allow barometric pressure to be introduced to the fuel
pressure regulator.
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13-142FUEL SYSTEM - Injector
SERVICE POINT OF REMOVAL
MlBSSAI1. DISCONNECTION OF HIGH PRESSURE FUEL HOSE
Bleed the residual pressure within the fuel pipe line so as to
LA;prevent the flow of fuel.
Caution
Cover the hose connection with rags to prevent splash
of fuel that could be caused by some residual pressurein the fuel pipe line.
INSPECTION
INJECTORS
M13SCAC(1) Measure resistance between terminals of injector using a
circuit tester.
Standard value:13
- 16 R [at 20°C (68”F)]
2
- 3 LR [at 20°C (68”F)l
(2) If the resistance is out of specification, replace the injector.
SERVICE POINTS OF INSTALLATION
MlBSDAV
10. INSTALLATION OF INJECTORWhile turning the injector to the left and right, install it to the
delivery pipe.
Check to be sure that the injector turns smoothly.
LCaution
If it does not turn smoothly, the O-ring may be trapped.Remove the injector and then
m-insert it into the
delivery pipe and check once again.
4. INSTALLATION OF FUEL PRESSURE REGULATORWhen connecting the fuel pressure regulator to the delivery
pipe, apply light oil or petrol to the O-ring, and then insert,
being careful not to damage the O-ring.
1. CONNECTION OF HIGH PRESSURE FUEL HOSE
When connecting the high pressure fuel hose to the
delivery pipe, apply petrol to the hose union, and then
insert, being careful not to damage the O-ring.
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INTAKE AND EXHAUST - Intake Manifold.15-1705LOO84
ProtrusionFRONT
ProtrusionA\
\ProtrusionProtrusidnOIL0857
FRONT
Intake mamfold7lN0090
APPLY~~ lubricant
INSPECTIONMlIMCATZCheck the following points; replace the part if a problem is
found.
INTAKE MANIFOLD(1) Check for damage or cracking of any part.
(2) Clogging of the negative pressure (vacuum) outlet port, or
clogging of the gas passages.
(3) Check deflection of installation surface with straight edge
and thickness gauge.
Standard value
: 0.15 mm (.0059 in.) or less
Limit
: 0.2 mm (.008 in.)
SERVICE POINTS OF INSTALLATIONMISMDAH
13. INSTALLATION OF INTAKE MANIFOLD GASKETInstall with gasket protrusions in the position illustrated.
10. INSTALLATION OF INTAKE MANIFOLD MOUNTING
NUT
Tighten the intake manifold mounting nuts one bank after
the other by the following ‘procedure.
(1) Tighten the nuts in the front bank to 3 to 5 Nm (2.2 to
3.6 ft.lbs.).
(2) Tighten the nuts in the rear bank to 12 to 15 Nm (9 to 11ft.lbs.).
(3) Tighten the nuts in the front bank to 12 to 15 Nm (9 to
11 ft.lbs.).
(4) Repeat steps (2) and (3) one more time respectively.
9. INSTALLATION OF INTAKE MANIFOLD MOUNTING
NUT
Apply lubricant sparingly to the intake manifold mounting
nuts.
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23-1
AUTOMATIC
TRANSAXLE
CONTENTSMZJAA- _
ANNULUS GEAR AND TRANSFER DRIVE GEARTransmission Fluid Level Inspection................................46SET................................................................................................
102Transmission Fluid Replacement........................................
46
DIFFERENTIAL........................................................................104SPECIAL TOOLS........................................................................
16
:......................................... 12IEND CLUTCH ASSEMBLY....................................................99SPECIFICATIONS..........................
FRONT CLUTCH ASSEMBLY................................................95
GENERAL INFORMATlON....................................................2
KICKDOWN SERVO................................................................
107
LOW-REVERSE BRAKE............................................................
107
OIL PUMP....................................................................................93
PLANETARY GEAR................................................................
100
REAR CLUTCH ASSEMBLY....................................................97
SELECTOR LEVER ASSEMBLY............................................58
SERVICE ADJUSTMENT PROCEDURES............................46
Accelerator Switch
Inspection and Adjustment................
50Drive Shaft Oil Seals Replacement....................................
52Inhibitor Switch and Control Cable Adjustment................
52Key Interlock Mechanism Check........................................50KickdownServo Adjustment................................................
47Line Pressure Adjustment....................................................
48Reducing Pressure Adjustment........................................
49Selector Lever Operation Check........................................
50Shift Lock Mechanism Check............................................51Speedometer Cable Replacement....................................53
General Specifications........................................................12Lubricants............................................................................15Service Specifications........................................................12Spacer and Snap Ring........................................................13Valve Body Spring Identification Chart............................13
SPEEDOMETER DRIVEN GEAR ASSEMBLY....................106
TRANSAXLE ASSEMBLY........................................................62
TRANSAXLE CONTROL*........................................................54
TRANSAXLE OIL COOLER, HOSES, TUBES
....................66
TRANSFER SHAFT....................................................................92
TROUBLESHOOTING............................................................
19
A/T Safety-lock System Troubleshooting........................44Converter Stall Test............................................................
43
Diagnosis and Test
................................................................
22
Element in Use at Each Position of Selector Lever........31Inspection
of ControlSystem............................................
28Inspection of Electronic Control System Components....32Oil Pressure Tests................................................................
39ShiftPatterns....................................................................
31,42Troubleshooting Guide........................................................
20
VALVE BODY. . . .._._.................................................................... 108
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
(1)A Supplemental Restraint System (SRS), which uses a driver-side air bag, has been installed in the 3668GT.(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 beremoved/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 topersonal 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 an
authorized MITSUBISHI dealer.
(3) MlTSUBISHI 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 the
ISRS or any SRS-related component.