1997 MITSUBISHI TRITON check oil

11A-2
ENGINE <4G6>
CONTENTS11109000399
GENERAL INFORMATION 3. . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS 3. . . . . . . . . . . . . . . . .
SEALANT 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS 5. . . . . . . . . . . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 7. . . . . . . . . . . . . . . . . . . . .
Drive Belt Tension Check and Adjustment 7. . . . .
Ignition Timing Check and Adjustment 10. . . . . . .
Idle Speed Check 11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Idle Mixture Check 11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Compression Pressure Check 12. . . . . . . . . . . . . . . .
Manifold Vacuum Check 13. . . . . . . . . . . . . . . . . . . . . Lash Adjuster Check 14. . . . . . . . . . . . . . . . . . . . . . . .
CAMSHAFT OIL SEAL 16. . . . . . . . . . . . . . . . . . . .
OIL PAN, OIL SCREEN 19. . . . . . . . . . . . . . . . . . . .
CYLINDER HEAD GASKET 21. . . . . . . . . . . . . . . .
TIMING BELT, TIMING BELT B 26. . . . . . . . . . . .
CRANKSHAFT FRONT OIL SEAL 32. . . . . . . . . .
CRANKSHAFT REAR OIL SEAL 35. . . . . . . . . . .
ENGINE ASSEMBLY 37. . . . . . . . . . . . . . . . . . . . . .

ENGINE <4G6> ± General Information/Service Specifications11A-3
GENERAL INFORMATION11100010322
Items4G634G64
Total displacement m
1,9972,351
Bore y Stroke mm85.0 x 88.086.5 x 100.0
Compression ratio9.59.5
Combustion chamberPentroof typePentroof type
Camshaft arrangementSOHCSOHC
Number of valve
Intake88
Number of valve
Exhaust88
Intake
OpeningBTDC 11
BTDC 18

Valve timing
Intake
ClosingABDC 53
ABDC 58

Valve timing
Exhaust
OpeningBBDC 63
BBDC 58

Exhaust
ClosingATDC 21
ATDC 18

Fuel system
Electronic control
multipoint fuel
injectionElectronic control
multipoint fuel
injection
Rocker armRoller typeRoller type
Auto-lash adjusterEquippedEquipped
SERVICE SPECIFICATIONS11100030342
ItemsStandard valueLimit
Alternator drive
belt
Tension NWhen checked294 ± 490±
belt
tension
When a used belt is installed343 ± 441±
When a new belt is installed490 ± 686±
Deflection
(Reference
When checked7.0 ± 9.0±
(Reference
value) mmWhen a used belt is installed7.5 ± 8.5±
When a new belt is installed5.5 ± 7.5±
Power steering
oilpumpdrive
Tension NWhen checked294 ± 490±
oil um drive
belt tensionWhen a used belt is installed343 ± 441±
When a new belt is installed490 ± 686±
Deflection
(Reference
When checked5.5 ± 7.5±
(Reference
value) mmWhen a used belt is installed6.0 ± 7.0±
When a new belt is installed4.0 ± 6.0±

ENGINE <4G6> ± Engine Assembly11A-39
REMOVAL SERVICE POINTS
A
POWER STEERING OIL PUMP ASSEMBLY AND
A/C COMPRESSOR ASSEMBLY REMOVAL
1. Remove the oil pump and A/C compressor (with the hose
attached).
2. Suspend the removed oil pump (by using wire or similar
material) at a place where no damage will be caused
during removal/installation of the engine assembly.
B
ENGINE ASSEMBLY REMOVAL
1. Check that all cables, hoses, harness connectors, etc.
are disconnected from the engine.
2. Lift the chain block slowly to remove the engine assembly
upward from the engine compartment.
INSTALLATION SERVICE POINT

AENGINE ASSEMBLY INSTALLATION
Install the engine assembly. When doing so, check carefully
that all pipes and hoses are connected, and that none are
twisted, damaged, etc.

ENGINE <4D5> ± Service Specifications/Sealants11B-3
SERVICE SPECIFICATIONS11100030359
ItemsStandard valueLimit
Alternator drive belt
tension (for each
Tension NWhen checked245 ± 441±
tension (for each
belt)When a used belt is installed294 ± 392±)
When a new belt is installed392 ± 588±
Deflection
(Reference
When checked12.0 ± 17.0±
(Reference
value) mmWhen a used belt is installed13.0 ± 16.0±)
When a new belt is installed10.0 ± 13.0±
Power steering oil
pump drive belt ten
Tension NWhen checked294 ± 490±
pump drive belt ten-
sionWhen a used belt is installed343 ± 441±
When a new belt is installed490 ± 686±
Deflection
(Reference
When checked8.0 ± 12.0±
(Reference
value) mmWhen a used belt is installed9.0 ± 11.5±)
When a new belt is installed6.0 ± 8.0±
A/C compressor
drive
Tension NWhen checked320 ± 400±
drive
belt tensionWhen a used belt is installed320 ± 400±
When a new belt is installed480 ± 560±
Deflection
(Reference
When checked6.0 ± 7.0±
(Reference
value) mmWhen a used belt is installed6.0 ± 7.0±)
When a new belt is installed4.5 ± 5.5±
Valve clearance (at hot) mm0.25±
Injection timing (Value indicated on dial gauge mm)9
ATDC (1 + 0.03)±
Idle speed r/min750 + 100±
Idle up engine speed for ABS r/min1,900 + 100±
Compression pressure kPa3,040Min. 2,200
Compression pressure difference of all cylinder (at engine speed of 280
r/min) kPa±Max. 300
Timing belt tension mm4 ± 5±
Timing belt B tension mm4 ± 5±
SEALANTS11100050270
ItemsSpecified sealantRemarks
Oil panMITSUBISHI GENUINE PART
MD970389 or equivalentSemi-drying sealant
Semi-circular packing and rocker
cover seal, and cylinder head seal3M ATD Part No. 8660 or equivalent

ENGINE <4D5> ± Engine Assembly11B-35
REMOVAL SERVICE POINTS
A
POWER STEERING OIL PUMP ASSEMBLY AND
A/C COMPRESSOR ASSEMBLY REMOVAL
1. Remove the oil pump and A/C compressor (with the hose
attached).
2. Suspend the removed oil pump (by using wire or similar
material) at a place where no damage will be caused
during removal/installation of the engine assembly.
B
ENGINE ASSEMBLY REMOVAL
1. Check that all cables, hoses, harness connectors, etc.
are disconnected from the engine.
2. Lift the chain block slowly to remove the engine assembly
upward from the engine compartment.
INSTALLATION SERVICE POINT

AENGINE ASSEMBLY INSTALLATION
Install the engine assembly. When doing so, check carefully
that all pipes and hoses are connected, and that none are
twisted, damaged, etc.

MPI ± General Information13A-3
MULTIPOINT FUEL INJECTION (MPI)13100010265
GENERAL INFORMATION
The Multipoint Fuel Injection System consists
of sensors which detect the engine conditions,
the engine-ECU which controls the system
based on signals from these sensors, and
actuators which operate under the control of
the engine-ECU. The engine-ECU carries outactivities such as fuel injection control, idle
speed control and ignition timing control. In
addition, the engine-ECU is equipped with
several diagnosis modes which simplify
troubleshooting when a problem develops.
FUEL INJECTION CONTROL
The injector drive times and injector timing are
controlled so that the optimum air/fuel mixture
is supplied to the engine to correspond to the
continually-changing engine operation condi-
tions.
A single injector is mounted at the intake port
of each cylinder. Fuel is sent under pressure
from the fuel tank by the fuel pump, with the
pressure being regulated by the fuel pressure
regulator. The fuel thus regulated is distributed
to each of the injectors.
Fuel injection is normally carried out once for
each 2-cylinder group for every two rotationsof the crankshaft. This is called group fuel
injection. The engine-ECU provides a richer
air/fuel mixture by carrying out ªopen-loopº
control when the engine is cold or operating
under high load conditions in order to maintain
engine performance. In addition, when the
engine is warm or operating under normal
conditions, the engine-ECU controls the air/fuel
mixture by using the oxygen sensor signal to
carry out ªclosed-loopº control in order to obtain
the theoretical air/fuel mixture ratio that
provides the maximum cleaning performance
from the three way catalyst.
IDLE AIR CONTROL
The idle speed is kept at the optimum speed
by controlling the amount of air that bypasses
the throttle valve in accordance with changes
in idling conditions and engine load during
idling. The engine-ECU drives the idle speed
control (ISC) motor to keep the engine running
at the pre-set idle target speed in accordance
with the engine coolant temperature and airconditioner load. In addition, when the air
conditioner switch is turned off and on while
the engine is idling, the ISC motor operates
to adjust the throttle valve bypass air amount
in accordance with the engine load conditions
in order to avoid fluctuations in the engine
speed.
IGNITION TIMING CONTROL
The power transistor located in the ignition
primary circuit turns ON and OFF to control
the primary current flow to the ignition coil. This
controls the ignition timing in order to provide
the optimum ignition timing with respect to theengine operating conditions. The ignition timing
is determined by the engine-ECU from the
engine speed, intake air volume, engine coolant
temperature and atmospheric pressure.
SELF-DIAGNOSIS FUNCTION

When an abnormality is detected in one
of the sensors or actuators related to
emission control, the engine warning lamp
(check engine lamp) illuminates as a
warning to the driver.

When an abnormality is detected in one
of the sensors or actuators, a diagnosiscode corresponding to the abnormality is
output.

The RAM data inside the ENGINE-ECU
that is related to the sensors and actuators
can be read by means of the MUT-II. In
addition, the actuators can be force-driven
under certain circumstances.

MPI ± Troubleshooting13A-19
Code No. 36 Ignition timing adjustment signal systemProbable cause
Range of Check

Ignition switch: ON
Set conditions

The ignition timing adjusting signal wire is shorted to the earth.
Short circuit to earth of the ignition timing adjustment
signal line

Malfunction of the engine-ECU
Measure at the ignition timing adjust-
ment connector A-42.

Measurement of the voltage (Ignition
switch: ON)
OK:4.0 ± 5.2 VNGCheck the following connector. C-50NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the
engine-ECU connector and the ignition
timing adjustment terminal.NG
Repair
OK
Replace the engine-ECU.
OK
Replace the engine-ECU.
Code No. 41 Injector systemProbable cause
Range of Check

Engine speed is approx. 50 ± 1,000 r/min

The throttle position sensor output voltage is 1.15 V or less.

Actuator test by MUT-II is not carried out.
Set conditions

Surge voltage of injector coil is not detected for 4 seconds.
Malfunction of the injector

Improper connector contact, open circuit or
short-circuited harness wire of the injector circuit

Malfunction of the engine-ECU
Check the injector. (Refer to P.13A-89.)NG
Replace
OK
Measure at the injector connectors.
A-45, A-46, A-57, A-61.

Disconnect the connector, and
measure at the harness side.

Voltage between 1 and earth
(Ignition switch: ON)
OK:System voltageNGCheck the following connectors.
A-45, A-46, A-57, A-61.NG
Repair
OK
Check trouble symptom.NGCheck the harness wire between the
engine-ECU and the injector connector,
and repair if necessary.
Check the injector control circuit.
(Refer to P.13A-55, INSPECTION PRO-
CEDURE 47.)OK

MPI ± Troubleshooting13A-26
INSPECTION PROCEDURE 5
No initial combustion (starting impossible)
Probable cause
In cases such as the above, the cause is probably that a spark plug is defective,
or that the supply of fuel to the combustion chamber is defective.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.
Malfunction of the ignition system

Malfunction of the fuel pump system

Malfunction of the injectors

Malfunction of the engine-ECU

Malfunction of the immobilizer system with immobilizer system>

Foreign materials in fuel
Check battery voltage when cranking.
OK:8 V or higherNGCheck the battery. (Refer to GROUP 54 ± Battery.)
OK
Is immobilizer-ECU diagnosis code displayed? immobilizer system>Ye sCheck the immobilizer.
(Refer to GROUP 54 ± Ignition Key and Immobilizer.)
No
MUT-II: Inspection of no initial combustion.
(Refer to P.13A-47, INSPECTION PROCEDURE 34.)
OK
Can any sound be heard from the injectors when cranking?NGCheck the injector system. (Refer to P.13A-19, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE 41.)
OK
Ignition system: Inspection of no initial combustion.
(Refer to P.13A-47, INSPECTION PROCEDURE 35.)
OK
Check the following items.

Check the ignition coil, spark plugs, spark plug cables. (Refer to GROUP 16 ± On-vehicle service.)

Check if the injectors are clogged.

Check if foreign materials (water, alcohol, etc.) got into fuel.

Check the compression pressure.

Check the immobilizer system. (Refer to GROUP 54 ± Ignition Key and Immobilizer.)