MITSUBISHI SPYDER 1990 Service Repair Manual

On-vehicle Inspection of ENGINE (NON-TURBO)> 1
2. removal and installation of the oxygen sensor,
refer to GROUP 15
Exhaust Pipe, Main
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32On-vehicle, Inspection of
(NON-TURBO)>
INJECTOR CHECK
MeasurementofResistance between Terminals
1. Remove the injector connector.
2. Measure the resistance between terminals.
Standard value:
[at
3. Install the injector connector
Checking operation sound
Using a stethoscope or long blade screwdriver, chec k the
operation sound (“tick-tick-tick”) of injectors dur ing idling or
during cranking
Check that as the engine speed increases, the frequ ency
of the operating sound also increases.
Caution
Note that even if the injector you are checking is not
operating, you will hear the operating sound of the other
injectors.
NOTE
If no operating sound is heard from the injector th at is being
checked, check the injector drive circuit. If there is nothing
wrong with the circuit, a defective injector or PCM is suspected
IDLE AIR CONTROL MOTOR (STEPPER
MOTOR) CHECK
Coil Resistance Check
1. Disconnect the idle air control motor connector.
2.Measure the resistance between terminal 1 and termi nal
4of the connector at the idle air control motor side .
Standard value: 36-52
[at
3.Measure the resistance between terminal 2 and termi nal
3 of the connector at the idle air control motor side.
Standard value: 36-52
[at
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On-vehicle Inspection of
ENGINE (NON-TURBO)>
EVAPORATIVE EMISSION PURGE
CHECK
1 7 ’
ELECTRIC EGR
Refer to GROUP 17 Emission Control
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REMOVAL AND INSTALLATION
l Fuel Line Pressure Reduction (Refer to P. Post-Installation Operation
Battery and Air Hose RemovallBattery and Air Intake Hose Installationl Fuel Leakage Inspection
Engine oilI
2.5Nm
I
6
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00003911
Removal steps
1. High-pressure fuel hose connection6. Retainers2.O-ring
3. Injector harness connector
4. Fuel rail5.Injector connectors

ENGINE (NON-TURBO)>
REMOVAL SERVICE POINT,
F U E L
Remove the fuel rail the attached’
,
Do not drop the injector.
INSTALLATION SERVICE POINTS
INJECTORS INSTALLATION
(1) Apply a small amount of clean engine oil to the O-ring.
Caution
Donot let the engine oil get into the fuel rail.
(2) While turning the injector to the left and righ t, install it
to the fuel rail.
(3) Check to be sure that the injector turns smooth ly.
If it does not turn smoothly, the O-ring may be tra pped,
remove the injector and then reinsert it into the f uel
and check again.
HIGH-PRESSURE FUEL HOSE CONNECTION
When connecting the high-pressure fuel hose to the fuel rail,
apply a small amount of engine oil to the hose union, and
then insert, being careful not to damage the O-ring .
Caution
Do not let the engine get .
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ENGINE (NON-TURBO)>
THROTTLE BODY
REMOVAL AND INSTALLATION
Pm-removall Battery Removal
(Refer to GROUP 17
On-vehicle
3.9 Nm5
2.9
Removal steps
1. Air intake hose
2. Accelerator cable connection
3.Vacuum hose connection4.TPS connector 5.
motor connector6.Throttle7.Throttlebody bodygasket
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ENGINE (NON-TURBO)> Throttle Body
DISASSEMBLY AND REASSEMBLY
2.2
2I
. .
1. .
steps
1. motor assembly2. Throttle body
DISASSEMBLY SERVICE POINT
MOTOR REMOVAL
Do not disassemble the motor.
2.Do not immerse solvent to clean the sensor and moto r.
Clean them with shop towel.
THROTTLE BODY REMOVAL
1. Do not remove the throttle valve.
2. Check if the vacuum port or passage is clogged. Use
compressed air to clean the vacuum passage.
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ENGINE
AND ENGINE> G e n e r a l
ENGINE (TURBO) AND ENGINE>13199910319
GENERAL INFORMATIONThe
Fuel Injection System consists
of sensors which detect the engine conditions,
the ENGINE CONTROL MODULE (ECM) which
controls the system based on signals from these
sensors, and actuators which operate under
the control of the ECM.
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 regulated by the fuel pressure regula-
tor. The regulated fuel is distributed to each
of the injectors.
Fuel injection is normally carried out once for
each cylinder for every two rotations of the
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 id-
ling.
The ECM drives the idle air control (IAC) motor
to keep the engine running at the pre-set idle
target speed in accordance with the engine
IGNITION TIMING CONTROL
The ignition power transistor located in the igni-
tion primary circuit turns ON and OFF to control
the primary current flow to the ignition coil.
This controls the ignition timing in order to pro-
vide the optimum ignition timing with respect The ECM carries out activities such as fuel
injection control, idle air control and ignition
timing control.
In addition, the ECM is equipped with several
diagnostic test modes which simplify trouble-
shooting when a problem develops.
. .
crankshaft. The firing is This
is called
The provides a richer
air/fuel mixture by carrying out “open-loop” con-
trol when the engine is cold or operating under high load
in order to maintain engine
performance. In addition, when the engine is warm or operat-
ing under normal conditions, the ECM controls
the air/fuel mixture by using the heated oxygen
sensor signal to carry out “closed-loop” control
in order to obtain the theoretical air/fuel mixture
ratio that provides the maximum cleaning per-
formance from the three way catalyst.
coolant temperature and air conditioning load.
In addition, when the air’ conditioning switch
is turned off and on while the
is
the 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.
to the engine operating conditions. The ignition
timing is determined by the ECM from the en-
gine speed, intake air volume, engine coolant
temperature and atmospheric pressure.
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ENGINE (TURBO)
ENGINE>
DIAGNOSTIC TEST MODEl When an abnormality is detected in one
of the sensors or actuators related to emis-
sion control, the CHECK
FUNCTION INDICATOR LAMP illuminates
as a warning to the driver.
l When an abnormality is detected in one
of the’ sensors or actuators, a
OTHER CONTROL FUNCTIONS
1. Fuel Pump Control
Turns the fuel pump relay ON current
is supplied to the fuel pump while the engine
is cranking or running.
2. A/C Compressor Clutch Relay Control Turns the A/C compressor clutch ON and
OFF.
3. Fan Relay Control
The radiator fan and condenser fan speeds
are controlled in response to the engine
coolant temperature and vehicle speed.
4. Fuel
Control
Supplies current to fuel pressure solenoid
coil to raise the fuel pressure so that the
fuel does not vaporize when the engine
is started while it is warm.
trouble code ‘the,,
normality is output.
lThe RAM data inside the that
to the sensors and actuators can be read’
by
scan’ tool.
addition, the actuators can be controlled
under certain
5. Charge Control
Controls the intake charge pressure by con-
trolling the duty of the turbocharger
gate solenoid!
6. Intake Pressure Gauge’ Control Indicates the intake charge pressure on
the
7. Generator Output Current Control
Prevents generator output current from in-
creasing idle speed from
dropping at times such as when the head-
lights are turned on.
8.Evaporative Emission Purge Solenoid Con-
trol Engine (TURBO)>
Refer to
17.
Evaporative Emission Purge Solenoid Con-
trol GROUP 17.
9. EGR Solenoid’ Control
Refer to GROUP
,,
,
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E N G I N E ( T U R B O )
AND
Engine (Turbo)>
Item
Throttle bodyThrottle bore mm (in.)5 4
Engine control
module (ECM)
Sensors
pressure
egulator
Volume air flow sensor
Barometric pressure sensorK a r m a n v o r t e x t y p e , ,
Intake air temperature sensor Thermistor type
Engine coolant temperature sensor
T h e r m i s t o r t y p e
Heated oxygen sensor Zircon type
Vehicle speed sensor Electromagnetic resistance elem ent ‘type
Park/neutral position switchContact switch type .
Camshaft position sensor
Crankshaft position sensorHall element type
Throttle position sensor
Idle air control motor Variable resistor type
Stepper motor type [Stepper. type ‘by-pass’ air
control system
the air
Closed throttle position switch
model No.
Rotary contact type,
,
Knock sensor Piezoelectric type
Power steering pressure switch
Contact switch type
Manifold differential pressure sensor Semiconductor type
fuel injection (MFI) relay
Contact switch type
Fuel pump relay
Injector type and number
Injector identification mark Contact switch type
Electromagnetic type, 4
solenoid Duty cycle type solenoid valve
Evaporative emission purge solenoid
Duty cycle type solenoid valve
Fuel pressure solenoid
Turbocharger waste gate solenoid ON/OFF type solenoid valve
Duty cycle type solenoid valve
Regulator
(psi) 294 (43)
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